SA380-IT User Guide


IMPORTANT!

The SA380-IT user guide is presently undergoing an extensive update to reflect the latest advancements in features and operation. Please check this page regularly for updates.

6 Pinnacle Way, Pride Park, Derby, UK, DE24 8ZS

Sales:sales@mpec.co.uk
General Enquiries:enquiries@mpec.co.uk

© Mpec Ltd. 2020 All rights reserved.

No part of this publication may be copied without the prior consent of Mpec.

www.mpec.co.uk



Contents

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1) Product Overview

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The SA380-IT is designed to facilitate the continuous monitoring of circuit voltage and resistance to earth of up to 5 independent circuits.

Maintenance Reduction and Failure prevention of Earth Faults are best realised through continuous monitoring. It facilitates:

  • Detection of transient safety and operational risks that may be missed by infrequent periodic inspection.
  • The removal of the requirement for time-consuming and dangerous physical inspection and measurement.
  • The ability to predict, schedule and fix developing earth faults before they become an operational or safety risk.

Key Features

  • Independent monitoring of up to 5 circuits, each circuit can be one of the following systems:

    • Single phase IT AC system up to 160 V RMS.
    • Single phase IT AC system up to 160 V RMS with galvanically connected rectifiers.
    • IT DC system up to 160 V RMS. 

  • Equivalent resistance to earth measurement of AC circuits.
  • Resistance to earth measurement of each circuit leg of DC circuits.
  • Automatic adaptation to system leakage capacitance.
  • 1.5 seconds-per-circuit rapid response time.
  • Adjustable response values.
  • Detection of measurement interference due to core-to-core insulation degradation.
  • Monitored circuits supply voltage measurement.
  • Earth-loop continuity measurement.
  • Continual self-test for accuracy and safety.
  • Volt-free contact alarm output.
  • Auxiliary power supply output.
  • In-built GSM communication.
  • In-built Ethernet communication.
  • In-built RS485 communication.
  • In-built Bluetooth LE communication
  • 90 days data storage
  • Compatible with leading enterprise asset management systems.



2) Safety Information

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2.1) Explanation of Symbols

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The following designations are used to bring important hazards and information to the attention of the user:

A real threat to human life. It must be adhered to at all times.

A possible dangerous situation. There could be a risk to human life is correct procedure is not followed.

Information that should be followed to assure accurate and reliable operation.

A particularly useful application tip.



2.2) Intended Use

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The intended use of the SA380-IT insulation monitor is to remotely monitor pole-to-pole voltage and pole-to-earth resistance to earth (insulation resistance) of IT (earth-free) power supply circuits. Any other use, or use beyond the product specification is deemed improper. Mpec Technology Ltd shall not be liable for any loss or damage to life or property arising from improper use.

Correct use includes compliance with all instructions from the operation and maintenance manual with regard to transportation, installation, operation and maintenance.



2.3) Warranty & Liability

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Warranty and Liability claims due to injury to persons or damage to property are excluded if they can be attributed to any of the following causes:

  • Improper use of the SA380-IT as defined in section 1.2.
  • Unauthorized modification to the SA380-IT, structural or electrical.
  • Unauthorized repair of the SA380-IT.
  • Disasters caused by foreign bodies, fire, or force majeure.



2.4) Personnel

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Only personnel familiar with the installation, commissioning and operation of the SA380-IT may work with the SA380-IT. Such personnel must:

  • Read and understand the safety chapter of this document. 
  • Undertake appropriate training in the installation of electrical equipment.
  • Comply with all rules and regulations regarding safety for the given place of work.

Members of the public must never be permitted access to the SA380-IT.



2.5) Handling Hazards

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The following precautions must be taken during storage and transportation:

  • Protection from prolonged rainfall.
  • Protection from immersion in water.
  • Ensure that the storage temperature is not exceeded.
  • Protection against crushing.

Damaged enclosures can expose hazardous voltages and nullifies the SA380-IT Ingress-Protection.

Prolonged exposure to, or immersion in water exceeds the SA380-IT Ingress-Protection rating. Under such conditions dielectric withstand voltages cannot be guaranteed.

Never install or energise an SA380-IT that appears to be either physically damaged or suffering from water ingress.



2.6) Safe Installation

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Detailed wiring instructions can be found in section 3. The purpose of this section is to reinforce critical safety information.

Please note the following important wiring information:

No.Safe?Notes
1YesConnection of supply to "circuit 1" input using "Hi Z" supply output
2YesCorrect fitment of resistive cables. Connection to circuit bus-bar is via an independent fuse.
3YesCorrect fitment of resistive cables. No independent fuse is required for safe operation
4NoNo resistive cable fitted. Circuit vulnerable to short-circuit faults.
5NoIncorrect fitment of resistive cable. Circuit vulnerable to through-crimp failure.


No.Safe?Notes
1No

Do not "common" circuits.

N50(E) and N50(I) isolation compromised.

2No

Ensure correct connector position alignment.

N120 and B24 isolation compromised.

Not following this advice risks:

  • Circumvention if the inter-isolation of monitored circuits.
  • Short circuit of individual monitored circuits.
  • Electric shock.

The Functional Earth and Loop Earth must be connected to suitable earthing points using separate wires.

  • It is preferable to use independent earthing points for loop earth and functional earth connections.
  • It is tolerable to use a common earthing point if provision of a secondary earthing point is prohibitive.
  • It is not acceptable to simply strap Functional Earth to Loop Earth.

An ineffective Earth Loop circuit is unable to verify correct connection of the SA380-IT, hence insulation readings may be incorrect.

Only one insulation monitoring device may be used on a single interconnected circuit. Installation of additional monitoring devices will cause each device to "fight" the other, resulting in incorrect readings on both devices.

Check that the factory set earth loop and insulation resistance alarm levels are correct for your application. (See section 4.4.10)

Nominal voltage is used to drive important safety features of the SA380-IT

It is important that this is set correctly.

The Ethernet port is sensitive to electrical surges:

  • Additional surge protection must be fitted if the port is to be used continuously for data transmission using:
    • A dedicated Ethernet surge protection device, or
    • Use of screened Ethernet cable

  • Surge protection is not required for temporary configuration and diagnostics activities.

Power Supply

The SA380-IT can be purchased with two alternate power supply options:

  • 110 V AC
  • 12 V DC

The device power supply voltage is clearly indicated on the rear of the device.

Connection of a 110 V AC supply to 12 V DC units will render the device inoperable!


Limitations of use in the United Kingdom

The following restrictions upon use must be observed when the SA380-IT is deployed on UK rail infrastructure:

Never attempt to power the SA380-IT from a DC power source

Never attempt to wire any conductors from differing monitored circuits into the same input channel.

Users in other countries may disregard these warnings.

No residual hazards have been identified if the above advice is not followed, but these practices are against UK railway policy.

Ensure that you have exhausted all fault finding tasks prior to manually resetting any device interlock (see section 5.2 and section 4.4.5).

It is wise to conduct a manual insulation test on monitored circuits prior to, and after installation. This will help verify correct installation of the measurement circuit wiring during commissioning.

A manual continuity test between Functional Earth and Loop Earth connections after installation will help verify correct installation of the earth-loop circuit wiring during commissioning.

When conducting manual insulation testing on monitored circuits after commissioning, the SA380-IT must be either:

  • Prevented from attempting measurement (see section 4.4.5).
  • Physically disconnected from the monitored circuit.
  • Powered-down.

Failure to do so will result in incorrect readings.



3) Installation

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3.1) Parts and Tools Required

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Ensure you have the following parts and tools to hand prior to installation. Tools are not supplied.

Please note that the cable terminations to the "live" system, and cable markers are not supplied. This is because of the wide variety of methods of termination to power supply busbars encountered. Please ensure you have an adequate supply of appropriate terminations and a suitable master fuse prior to installation.


Parts


SA380-IT

Insulation Monitoring Unit

NA
  • SA380-IT-NR
  • SA380-IT-SD
1

M5 A2 Stainless Steel Washers

for device fitment

NA
  • SA380-IT-NR
  • SA380-IT-SD
2

M5 A2 Stainless Steel Nuts

for device fitment

NA
  • SA380-IT-NR
  • SA380-IT-SD
2

GSM Antenna

For cellular network communication

Mpec Part No:
MIS-PAN-PUK/LPAB
  • SA380-IT-NR
  • SA380-IT-SD
0 - 1

Shrouded Ferrule crimps 0.75 mm2

10 mm crimps for 0.75 mm2 wire terminations

WEIDMULLER H0,75/16 W SV INSULATED FERULE. P/N: 9025860000 
  • SA380-IT-NR
  • SA380-IT-SD
4 - 16

Uninsulated Ferrule Crimps

10 mm crimps for 1.5 mm2 wire terminations

WEIDMULLER H1,5/10 UNINSULATED FERULE. P/N: 0186500000
  • SA380-IT-NR
  • SA380-IT-SD
2

0.75 mm2 stranded single core cable

For power supply and monitored circuit connections

ELAND Grey NR Approved A1 0.75mm 1 Core Cable - A5RA1010075GR
  • SA380-IT-NR
  • SA380-IT-SD
0 - 30m

1.5 mm2 stranded single core "earth" cable

For primary and "loop" earth connections

ELAND Single Core, Stranded, 1.5 mm sq. CSA, Yellow / Green - A2TGY0015
  • SA380-IT-NR
  • SA380-IT-SD
0 - 3m

Resistive Cable

For safe connection to monitored circuits

Mpec Part No:
COM-IT-RESCAB
  • SA380-IT-NR
  • SA380-IT-SD
0 - 10

Cable Markers

For termination identification.

No Image
Quantity, type and requirement customer dependent
  • SA380-IT-NR
  • SA380-IT-SD
??

"Live End" Circuit Termination Crimps

For terminating power supply, monitored circuits and earth connections

No Image
Quantity, type and requirement customer dependent  
  • SA380-IT-NR
  • SA380-IT-SD
4 - 14 

Main Fuse T2A Fuse

Main fuse for device power connection. 

No Image
Type and requirement customer dependent 
  • SA380-IT-NR
  • SA380-IT-SD
1 

Additional Monitored Circuit Fuses

Optional fuses fitted in the positive leg of monitored circuits

No Image
Type and requirement customer dependent  
  • SA380-IT-NR
  • SA380-IT-SD
0-5

Screened Ethernet Cable

For fixed IP network communication. 

RS Blue Cat6 Cable S/FTP PVC Male RJ45/Male RJ45, 10m - 411-306
  • SA380-IT-NR
  • SA380-IT-SD
0 - 1

0.5 mmTwisted Pair Cable

For RS485 serial data connection.

RS Belden 1 Pair Industrial Cable 0.5 mm² - 382-7189
  • SA380-IT-NR
  • SA380-IT-SD
0 - 1

Shrouded Ferrule crimps 0.5 mm2

For RS485 serial data connection.

WEIDMULLER H0,5/14D W INSULATED FERRULE. PN. 9019010000
  • SA380-IT-NR
  • SA380-IT-SD
0 - 2


Tools


8 mm Nut driver or 8 mm spannerFor securing fixing nuts
WERA 190 i VDE Insulated Nut-driver - 05005315001

190 i VDE Insulated nutdriver


Square Wire End Ferrule CrimperFor crimping wire ferrules for correct wire termination to the SA380-IT device
WEIDMULLER PZ 10 SQR WIRE END FERULE CRIMPER. P/N: 1445080000


Insulated 2.5 mm Flat-blade ScrewdriverFor removing wires from the SA380-IT spring-cage connectors
WERA 160 i VDE Screwdriver - 05006105001

160 i VDE Insulated screwdriver for slotted screws


Wire Stripper / CutterFor preparing wires for termination
WEIDMULLER STRIPAX 16 ZERT


Red Crimping ToolFor crimping the 0.75 mm2 stranded single core cable to the resistive-cable modules
TE - Premium Crimp Tooling - PIDG - 409775-1


iPhoneFor local set-up and diagnostics
Mpec Part No: COM-IT-CD


Laptop + Ethernet CableFor local set-up and diagnostics if an iPhone is not available

System Requirements:

  • No Operating System requirement
  • Must run a "modern" web-browser
  • User must have ability to change IP settings
  • Cat5 or better RJ45 Ethernet cable.


Additional Crimping / Fixing Tool(s)For crimping and connecting power supply, monitored circuits and earth connections to the "live" system to be monitored. 
Type and requirement customer dependentNo Image

Drill + 12 mm Drill bitMaybe required to route the antenna to the exterior if the installation point.
Type and requirement customer dependentNo Image



3.2) SA380-IT Layout

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Front Panel
No.NameDescription
1PowerLit if the SA380-IT has main power
2NetworkLit if the SA380-IT is connected to the GSM network
3ServerLit if the SA380-IT is connected to an Asset Management Server System
4TestIlluminates during self-test.
5RunPulsates if the software is running.
6HW FaultIndicates a hardware or earth loop integrity problem
7Earth FaultIndicates the presence of an insulation fault
8Bluetooth

Combined Indicator and touch-sensitive button.

Touch to enable bluetooth functionality.

Extinguished: Bluetooth disabled.

Blinking: Awaiting pairing.

Lit: Paired and active

9Serial NumberEasy-read serial number of the device.
10SIM SerialSerial number of the built-in SIM
11MFG SerialFull serial number of the device.


Rear Panel
No.NameDescription
1SupplyPower supply to the SA380-IT
2Functional EarthCommon Earth point for all device measurement
3Loop EarthSecondary Earth point for earth continuity measurement
4Monitored CircuitsConnections for the IT circuits that require insulation monitoring
5HiZ OutputsA simple means of safely monitoring the insulation of the supply circuit.
6Auxiliary OutputsI/O to other devices and alarm circuits
7GSM AntennaFacilitates GSM connection to an Enterprise Asset Management System
8Ethernet JackAllows local configuration and diagnostics, or Ethernet connection to an Enterprise Asset Management System
9Fixing StudM5 mounting studs to fit BR930 / Q Style relay mountings. Brackets are available to allow alternate mounting arrangements
10Quality ControlDevice had undergone voltage withstand, calibration and inspection processes.
11Supply Voltage110 V AC or 12 V DC supply indication.



3.3) Typical Circuit

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Use the typical circuit below to aid in the production of reference designs.

Please ensure that you do however read and observe the complete installation instructions.



3.4) Pre-Installation

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The following precautions must be taken during storage and transportation:

  • Protection from prolonged rainfall.
  • Protection from immersion in water.
  • Ensure that the storage temperature is not exceeded.
  • Protection against crushing

Damaged enclosures can expose hazardous voltages and nullifies the SA380-IT Ingress-Protection.

Prolonged exposure to, or immersion in water exceeds the SA380-IT Ingress-Protection rating. Under such conditions dielectric withstand voltages cannot be guaranteed.

Never install or energise an SA380-IT that appears to be either physically damaged or suffering from water ingress.

It is wise to conduct a manual insulation test on monitored circuits both prior to, and after installation, but before energising the SA380-IT. This will help verify correct installation of the measurement circuit wiring.

A manual continuity test between Functional Earth and Loop Earth connections after installation, but before energising SA380-IT will help verify correct installation of the earth-loop circuit wiring.



3.5) Fitting

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Parts
SA380-IT

M5 A2 Stainless Steel Washers

M5 A2 Stainless Steel Nuts

Tools
8 mm Nut driver or 8 mm spanner

190 i VDE Insulated nutdriver

Information
  • Mounting studs are arranged to fit relay racking spaced for BR930 or "Q Style" relays
  • Exact mounting stud spacings can be found in the specification section of the user guide
  • Hinged wall brackets and adaptor brackets are available to accommodate alternative mounting arrangements. Contact Mpec.
Method
  • Offer the SA380-IT device up to the relay racking
  • Slide the washers over the mounting studs
  • Fit the nuts and tighten using the nut-driver / spanner.

  • Inspect that the spring washers are not fully compressed (over-tightened). Optimum tightening torque is 1.0 Nm-1
  • The SA380-IT should feel secure and free of play or wobble.



3.6) Termination of SA380-IT Wiring

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Parts
0.75 mmShrouded Ferrule crimps 

Uninsulated Ferrule Crimps

0.75 mm2 stranded single core cable

1.5 mm2 stranded single core "earth" cable

Cable MarkersNo Image
Tools
Square Wire End Ferrule Crimper

Wire Stripper / Cutter

Information

All wire terminations into the SA380-IT use require wire insertion into spring-clamp connectors at the rear of the device.

  • All wire ends must be correctly terminated with a ferrule crimp of the appropriate size.
  • The ferrules must be compressed using a square-end ferrule crimping tool.
Method

Affix cable marker beads if required.

Strip 12 mm of outer insulation from the end of the cable

Select the correct crimp:

Fit the crimp over the wire end, ensuring the crimps fit flush against the cable insulation.

Compress the crimp using a square-ended ferrule crimping tool

Inspect the crimp

  • No loose strands
  • No excessive copper exposed at either crimp end.
  • Sufficient exposed wire held firm by the crimp
  • An even square profile.
  • Ferrule is secure

To insert a wire into the spring-cage connector

  • Simply press the ferrule fully-home into the spring cage plug
  • Pull at the wire, if secure the wire will not move.
  • No exposed metal should be visible if wire correctly crimped and pushed fully-home into the connector.

To remove a wire from the spring-cage connector

  • Press the blade of an insulated flat-bladed screwdriver into the release latch
  • Withdraw to wire



3.7) Wiring the Power Supply

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Parts
0.75 mm2 stranded single core cable

0.75 mmShrouded Ferrule crimps 

Cable Markers

No Image

"Live End" Circuit Termination CrimpsNo Image
Main Fuse T2A FuseNo Image
Tools
Square Wire End Ferrule Crimper

Wire Stripper / Cutter

Additional Crimping / Fixing Tool(s)No Image
Information

Power Supply

The SA380-IT can be purchased with two alternate power supply options:

  • 110 V AC
  • 12 V DC

The device power supply voltage is clearly indicated on the rear of the device.

Connection of a 110 V AC supply to 12 V DC units will render the device inoperable!

Limitations of use in the United Kingdom

The following restrictions upon use must be observed when the SA380-IT is deployed on UK rail infrastructure:

Never attempt to power the SA380-IT from a DC power source

Users in other countries may disregard these warnings.

No residual hazards have been identified if the above advice is not followed, but these practices are against UK railway policy.

"Live end" crimp types and fuse-holder sizes vary, therefore no specific crimps or fuses are recommended.

Method

Wire the "+" and "-" supply terminals as shown:

Do not use resistive cables

Supply Voltage Ranges:

Labelled Voltage

Min. VMax. V
110 V AC40 AC/DC160 AC/DC
12 V DC10 DC16 DC

Use appropriate cable markers, crimps & crimp tools for the live terminations.

Use appropriate tools to to affix the live cables their terminations.

The "positive" leg of the supply circuit must be fitted with a type "T2A" (2 Amp Slow-Blow fuse) of the appropriate size.

It is recommended to not apply power to the device until all installation steps are complete.



3.8) Wiring the Earth Loop

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Parts
1.5 mm2 stranded single core "earth" cable

Uninsulated Ferrule Crimps

Cable Markers

No Image

"Live End" Circuit Termination CrimpsNo Image
Tools
Square Wire End Ferrule Crimper

Wire Stripper / Cutter

Additional Crimping / Fixing Tool(s)No Image
Information

"Earth bus-bar" crimp types will vary, therefore no specific crimps are recommended.

The Functional Earth and Loop Earth must be connected to suitable earthing points using separate wires.

  • It is preferable to use independent earthing points for loop earth and functional earth connections.
  • It is tolerable to use a common earthing point if provision of a secondary earthing point is prohibitive.
  • It is not acceptable to simply strap Functional Earth to Loop Earth.

An ineffective Earth Loop circuit is unable to verify correct connection of the SA380-IT, hence insulation readings may be incorrect.

Method

Wire the FE and LOOP EARTH in one of the two ways shown below:

Use green / yellow sleeved cable to differentiate earth connections from monitored circuit and power connections

Use appropriate cable markers, crimps & crimp tools for the earth bus-bar terminations.

Use appropriate tools to to affix the earth cables to bus-bar terminals.

A manual continuity test between Functional Earth and Loop Earth connections after installation, but be aware that a standard digital multimeter may not obtain a true reading if stray voltages are present. If in doubt, use a earth-test device designed specifically for this purpose.

This measurement should therefore be considered a "sanity check" of the wiring, not the absolute resistance of the earth loop path.

  • Earth loop readings <= 40 Ω between FE and Loop Earth connections is considered acceptable.
  • Earth loop readings <= 500 Ω maybe considered tolerable by you organisation, but should be investigated,



3.9) Wiring of Input Circuits

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Parts
0.75 mmShrouded Ferrule crimps 

0.75 mm2 stranded single core cable

Cable markersNo Image
Resistive cable modules

"Live End" circuit termination crimpsNo Image
Optional circuit fusesNo Image
Tools
Square Wire End Ferrule Crimper

Wire Stripper / Cutter

"Red" crimp tool

Additional Crimping / Fixing Tool(s)No Image
Information

"Live end" crimp types and fuse-holder sizes vary, therefore no specific crimps or fuses are recommended.

If fuses are fitted to monitored circuits, these should be of smallest practical rating.

The maximum permissible voltage of montoried circuits is 160 V DC or 160 V AC RMS

Only one insulation monitoring device may be used on a single interconnected circuit. Installation of additional monitoring devices will cause each device to "fight" the other, resulting in incorrect readings on both devices.

Ensure that any existing earth-leakage devices connected to monitored circuits have been disabled.

There are two means of connecting monitored circuits to the SA380-IT. Via resistive cables, or via the HiZ outputs:


Resistive Cables

The SA380-IT device is typically supplied with resistive cables, or they can be purchased separately. The resistive cable features:

  • a 47 kΩ resistor fitted in-line
  • a 300 mm flying-lead to be terminated on the monitored circuit bus-bar.
  • an in-line through-crimp to allow extension of the resistive cable module with additional cable.

The purpose of the resistive cables are to limit current flow between monitored circuits in the event that any SA380-IT cabling inadvertently comes into contact with any other safety critical or high reliability circuits.

NoNotes
1Existing Earth Fault has compromised negative leg isolation
2B50 shorts to B120 at rear of SA380-IT.
3B120 shorts to N120 at rear of SA380-IT.
System remains safe due to protective resistance afforded by the connection cables


The purpose of the through crimp is to permit simple extension of cable runs from the SA380-IT to monitored circuits:

Failure of the through-crimp is mitigated by ensuring the in-line resistor is fitted facing the monitored circuit bus-bar connection.

No.Notes
1Through Crimp Failure results in fault connections to other live circuits or earth.
Supply remains protected by in-line resistor
SA380-IT has internal >90 kΩ protective resistance
2Through Crimp Failure results in fault connections to other live circuits or earth.
Unsafe failure due to orientation of protective resistor.



HiZ Outputs

It is common to perform monitored circuit functions on the same circuit that is used to power the SA380-IT device.

To simplify wiring it is possible to "jumper" across the power supply into "Channel 1" of the monitored circuits. This is achieved by the "HI Z" outputs.

The "HI Z" outputs present the power supply voltage as an output, albeit with a 47 kΩ resistor in each circuit leg. E.g.

BX HI Z is BX Supply with 47 kΩ in series.

NX HI Z is NX Supply with 47 kΩ in series.

This means that resistive cables are not required to jumper the HI Z outputs across to channel 1 as shown in the diagram below. The arrangement remains safe in the event of cable fault.

No.Notes
1Short Circuit of the supply protected by mandatory provision of a supply circuit fuse.
2Short Circuit of "HiZ" leads protected by internal 47 kΩ resistors

Please note the following important general wiring information:

No.Safe?
1Yes
Connection of supply to "circuit 1" input using "Hi Z" supply output
2Yes
Correct fitment of resistive cables. Connection to circuit bus-bar is via an independent fuse.
3Yes

Correct fitment of resistive cables

No independent fuse is required for safe operation

4No
No resistive cable fitted. Circuit vulnerable to short-circuit faults.
5No
Incorrect fitment of resistive cable. Circuit vulnerable to through-crimp failure.



No.Safe?
1No

Do not "common" circuits.

N50(E) and N50(I) isolation compromised

2No

Ensure correct connector position alignment.

N120 and B24 isolation compromised

Not following this advice risks:

  • Circumvention if the inter-isolation of monitored circuits.
  • Short circuit of individual monitored circuits.
  • Electric shock.

Method

Resistive Cables

  • Mark, strip and crimp the "live" end of the resistive cable module with an appropriate markers and crimps for the monitored circuits bus-bar connection.

    It is permissible to shorten the "live" end of the resistive module cable if it aids installation.

  • Starting at the SA380-IT, run correctly terminated and marked 0.75 mm2 single core cable from the SA380-IT rear connector to the monitored circuits connection point.
  • Strip 12 mm of insulation from the end of the single core cable at the "connection point" end.
  • Take a resistive cable module and splice the ordinary single core cable to the red PIDG through-crimp using the correct crimping tool.

  • Check the crimped connection:
    • No loose strands
    • No copper exposed at either crimp end.
    • Sufficient exposed wire held firm by the crimp
    • An even profile.
    • crimp is secure

  • Preferred: Make terminations to bus-bars using a fused connection if appropriate. Fuses should be rated as low as possible. The SA380-IT should never draw >2 mA from the supply under any circumstance.
  • Acceptable: If space is at a premium in existing installations, there is no safety risk in installing monitored circuit connections direct to bus-bars, circumventing a fused connection.

HiZ Outputs

  • Prepare two correctly terminated and marked 0.75 mm2 single core cables 50 mm each in length
  • Insert the 50 mm cables between input channel 1 and HiZ outputs.



3.10) GSM Connection

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Method

In railway settings the antenna must be fitted to the outside of the equipment enclosure (typically a location case or equipment room)

Affix the antenna head to the exterior of the equipment housing using the self-adhesive backing and back-nut.

This may require drilling a 12 mm hole.

  • Affix the antenna tail cable using the SMA screw-fit connector to the rear of the logger.
  • The SMA connector should be tightened by hand to avoid over-tightening
  • Do not over tighten the connection. Optimum tightening torque is 1.0 Nm-1

Do not attempt to shorten the cable without appropriate specialist tools.

Do not force the antenna cable around tight bends.

See the commissioning section for information on verifying GSM signal strength.

Parts
GSM Antenna

Tools
Drill + 12 mm Drill bitNo Image
Information

For non-panel mount scenarios, additional brackets may be required. These are not supplied with the SA380-IT.

Antenna placement tips

The radiation pattern of the supplied antenna is a torus (doughnut) about the horizontal plane.

There is zero reception directly above or below the antenna, there is maximal and even reception around the horizontal plane.


The SA380-IT device is typically shipped with factory fitted SIM and GSM antenna.

Please liaise with MPEC to specify your desired SIM package



3.11) Ethernet Connection

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Parts
Screened Ethernet Cable

Tools
NoneNo Image
Information

The Ethernet port is sensitive to electrical surges:

Additional surge protection must be fitted if the port is to be used continuously for data transmission using:

  • A dedicated Ethernet surge protection device, or
  • Use of screened Ethernet cable

  • Surge protection is not required for temporary configuration and diagnostics activities.
Method

The Ethernet port accepts standard Ethernet cable via an RJ45 connector.

The Ethernet port can be used as a monitoring port with no additional surge protection required.

  • If connecting direct to a computer, simply use an Ethernet patch cable to connect devices point to point.
  • If using the Ethernet port as a permanent data connection then use either a screened Ethernet cable, or standard cable with surge arrestor to connect to a nearby modem or Ethernet switch/router.

Successful connection can be verified by checking that the LAN port Link indication is lit solid, and the the activity indicator is blinking.

See the commissioning section for information on verifying Ethernet Connectivity.

See the operation section for detailed IP address settings information.



3.12) Wiring of Auxiliary Inputs

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Information

Crimp connections to external devices and circuits will vary, therefore no specific crimps are recommended.

Volt-Free-Contact

The maximum terminal voltage of the volt-free-contact output must not exceed 160 V RMS AC/DC.

Auxiliary Power

The maximum load of the auxiliary power supply output must not exceed 1 Watt.

RS485 Serial Data

RS485 functionality is not presently supported.

For wiring runs over 10 meters consider using screened cable as interference may be experienced.

For wiring runs over 30 meters, 100 Ω line-termination resistors should be fitted across the "A,B" terminations at both extremities of the data link.

Parts
0.75 mm2 stranded single core cable

0.75 mmShrouded Ferrule crimps 

Cable Markers

No Image

Circuit Termination CrimpsNo Image
0.5 mmTwisted Pair Cable

0.5 mm2  Shrouded Ferrule Crimps

Tools
Square Wire End Ferrule Crimper

Wire Stripper / Cutter

Additional Crimping / Fixing Tool(s)No Image
Method

Volt-Free-Contact Output (VFC)

The VFC is used to give a local indication of hardware or earth fault.

The VFC acts as a simple switch, the polarity of connection is irrelevant.

The maximum voltage that can be applied across the VFC is 160 V RMS AC/DC

The VFC is to be wired into an alarm circuit, or VFC input of a data logging device as follows:

It is recommended to use correctly terminated 0.75 mm2 stranded single core cable for this connection.

Auxiliary Supply

A 5 V DC, 1 W regulated power supply is made available at the rear of the unit to power auxiliary sensors.

The output is short-circuit and overload protected.

Connect:

  • 5 V terminal to the positive power terminal of the auxiliary equipment.
  • 0 V terminal to the negative power terminal of the auxiliary equipment.

It is recommended to use correctly terminated 0.75 mm2 stranded single core cable for this connection.

RS485 Serial Data

The RS485 link is provided to allow data connection to auxiliary sensors and data logging equipment.

It is recommended to use correctly terminated 0.50 mm2 twisted pair cable for this connection.

Wire "A" to "A" and "B" to "B" on all devices

RS485 supports a multi-drop bus architecture, numerous devices can share the same RS485 bus.



4) Commissioning

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4.1) Energise Device

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Power On
  • Visually inspect all wiring for sound installation.
  • Measure voltages of the supply and monitored circuits and confirm they are within expected specification.

This will help confirm the the correct circuits are wired into the intended input channels, and will help verify correct set-up during subsequent commissioning steps.

  • Connect the main supply fuse, applying power to the SA380-IT.
  • Check SA380-IT front panel shows:
    • Constant POWER indication
    • Pulsating RUN indication
    • A blinking Bluetooth indication
  • Where fitted, connect fuses and/or links of monitored circuits.



4.2) Connect to Device

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Mpec Connect & Bluetooth
  • Wireless configuration and diagnostics is facilitated by the "Mpec Connect" mobile app.
  • Mpec Connect is presently compatible with iPhone and iPad (Running iOS 13+)
  • Download and install the app by clicking on the icon below:

  • Permit the App to use bluetooth

  • The app will then attempt to pair with a nearby SA380-IT device
  • The SA380-IT has bluetooth disabled by default. It can be enabled by:
    • Restarting the device
    • Activating the module using the touch-sensitive front-panel

  • The bluetooth indicator will blink if the device is available for pairing.
  • If the App discovers only one SA380-IT, pairing will take place automatically.
  • If the App discovers multiple devices, the user will need to select the appropriate device to pair to.
  • Devices are listed by their unique serial number.

  • The presently connected device is indicated by the indicator.
  • A successfully paired device will show a solid blue bluetooth indication on the front panel.
  • The SA380-IT home screen will automatically load in the  device pane.


Bluetooth will switch off on the SA380-IT if the connection is left idle for 2 minutes. If this occurs, re-enable Bluetooth using the touch-sensitive front panel and reconnect to the device via the  view in the app.


You may need to set the time on the device if the SA380-IT is unable to locate a time-server using the GSM or Ethernet connections

The SA380-IT will not perform any measurements if the time is not set.

Web-browser & Ethernet
  • Wired configuration and diagnostics can be performed on any Ethernet enabled device that runs a modern web browser.
  • Connect Ethernet Cable.

The following instruction apply to the "Windows 10" operating system, however the network settings will be the same regardless of operating system.

  • Open Networks & Sharing Center:
  • Change Adapter Settings:
  • On "Local Area Connection", right-click, select "Properties":
  • Select "Internet Protocol Version 4 (TCP/IPv4)", then click "Properties":
  • Use the following IP settings, then click OK:


These settings assume that the SA380-IT resides on the 192.168.100.xxx sub-net. This is the default setting. If the IP address of your SA380-IT has been changed, You may need to change the IP settings above.

  • Connect to the web-based configuration and diagnostics tool using any HTML 5 compatible web browser.
  • Type the IP address of the SA380-IT into the address bar.
  • The default IP address is 192.168.100.115.

You may need to set the time on the device if the SA380-IT is unable to locate a time-server using the GSM or Ethernet connections

The SA380-IT will not perform any measurements if the time is not set.

Authentication

Any action that modifies the behaviour of the SA380-IT will require the operator to provide authentication details.

  • Authentication details need only be provided once per connection session.
  • Username and password details may be obtained from:
    • Mpec technology by emailing: support@mpec.co.uk
    • Project support staff from within your organisation.

4.3) Check for Latest Firmware

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Mpec always recommend that you check for the latest firmware at commissioning time.

New firmware will always offer enhanced performance, bug-fixes and security patches versus older firmware.

UK - Network Rail RADAR users

The following applies if you are using your SA380-IT

  • In the UK, and work for or on behalf of Network Rail.
  • Your device is configured for deployment on the Network Rail RADAR (Formerly Intelligent Infrastructure) system.

In this instance your SA380-IT will attempt to perform an automatic firmware update from RADAR servers using the FTP protocol.

This update can take up to 30 minutes, during which time, you will not be able to configure and therefore commission the SA380-IT.

If an FTP based upgrade attempt is underway, you will be able to determine so using the Device Status page:

FTP firmware upgrade can be overridden by performing a local firmware upgrade to the latest approved firmware by following the steps outlined below.

Upgrade Firmware

Navigate to Utilities→Firmware Upgrade

Make a mental note of your current firmware version

Click the Get Latest Firmware link to open a page in a new window that displays the latest recommended firmware packages for the SA380-IT

  • Centrix users should use Centrix Approved firmware
  • Network Rail RADAR users should use NR II Approved firmware

If the latest approved firmware is in advance of your installed version, then the update should be downloaded and installed.

To commence firmware upload, return the Firmware Upgrade screen and choose Select Firmware Package.

To pick firmware files on iPhone/iPad

To pick firmware files in a Web Browser

Once satisfied with the current version and package version, select Upload Firmware to perform the upgrade.

The device will restart once upgrade is complete.



4.4) Check Earth Loop Reading

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Inspect Earth Loop

Navigate to Live Measurements:

Check that the EARTH LOOP reading is in line with that measured during installation.

The SA380-IT will take resistance-to-earth readings of monitored circuits with an earth-loop resistance as high as 1,000 Ω given the default configuration of the device, however at commissioning:

  • Earth loop readings <= 40 Ω between FE and Loop Earth connections is considered acceptable.
  • Earth loop readings <= 500 Ω maybe considered tolerable by you organisation, but should be investigated,



4.5) Configure Monitored Circuits

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Auto-Detect Circuits

The Auto-detect feature of the SA380-IT is designed to speed up commissioning of the SA380-IT by detecting the nominal circuit voltage and type (AC or DC) of connected circuits.

  • To run auto-detect. Navigate to Settings and select Auto-Detect.
  • You will have no safety interlocks engaged on a new device with an operable earth-loop.

The SA380-IT will automatically detect which circuits are in use and assign these circuits a "common" railway nominal voltage:

Once completed, remember to Write Changes, to save the configuration.

Tweak Circuit Settings

Although autodetect will be enough to commission a SA380-IT in most scenarios, you may wish to change some of the circuit settings in order to:

  • Make the Circuit simple to identify, both on-site, and in any Enterprise Asset Management system.
  • Adjust the nominal circuit voltage if the autoset levels are inappropriate.

Individual circuit settings are accessible from the Settings page:

Rename circuits as appropriate:

You may wish to change the nominal voltage of the circuit.

Nominal voltage is used to drive important safety features of the SA380-IT

It is important that this is set correctly.

Nominal voltage may be set incorrectly due to:

  • The voltage being uncommon, hence autodetect failed to correctly identify the target voltage.
  • The circuit voltage is high. This can commonly be found in railway circuits with long cable runs and heavy loads.

Enter a new nominal voltage that aligns with typical measured voltage of the circuit in question:


Remember to save any changes:

Verify Circuit Readings

Navigate to Live Measurements:


Check the following:

1Circuit is named correctly
2SA380-IT measured voltage matches manual measured voltage 
3Nominal circuit voltage correct
4SA380-IT resistance-to-earth readings match manual readings taken prior to installation.

Refer to the troubleshooting guide in the event of any issue.



4.6) Check for Server Connection

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GSM Connection

The SA380-IT should be preconfigured to connect to your Enterprise Asset Management System. (EAMS)

If connectivity settings need to be changed, please refer to the operation section of this guide.

Use the images and table below to assess if server GSM connection has been established.

Refer to the troubleshooting guide in the event of any issue.

1SIM Registered with Operator
Requires active SIM and good signal strength
2Data Session Active
Requires SIM on correct tariff and correct APN settings
3Server Connection Handshaking
Requires active EAMS and correct server and protocol settings
4Server Connection Established
Requires that the SA380-IT is "deployed" on the EAMS

Ethernet Connection

The SA380-IT should be preconfigured to connect to your Enterprise Asset Management System. (EAMS)

If connectivity settings need to be changed, please refer to the operation section of this guide.

Use the images and table below to assess if server Ethernet connection has been established.

Successful Ethernet connection is highly dependent on correct IP settings on the the SA380-IT and all network infrastructure.

Refer to the troubleshooting guide in the event of any issue.

1Server Connection Handshaking
Requires active EAMS and correctly configured network, plus correct server, protocol & IP settings
2Server Connection Established
Requires that the SA380-IT is "deployed" on the EAMS


4.7) Troubleshooting

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If troubleshooting steps require a configuration change, refer to section 5 for detailed descriptions on the behaviour of all configuration items.


IssueSolutions
No Earth Loop readingTime is not set
Earth Loop unstableCheck for loose connections

Genuine unstable earthing conditions

Consider advanced earth loop stability config change

Earth Loop out-of-toleranceCheck for loose or missing connections

Genuinely poor earthing conditions

Check earth bonding of the electrical installation

Auto-Detect locks onto the incorrect supply voltage

The system voltage is atypical.

Manually edit the circuit voltage

Auto-Detect and actual voltage are not a good match

The system voltage is high

Manually edit the circuit voltage

Auto-Detect detects "wrong polarity"Check the polarity of the affected DC circuits wiring
Reported Voltage does not match manual site readingsCheck the AC/DC settings of the SA380-IT and the meter used to perform manual readings
Check that resistive cable modules has been used to make monitored circuit connections
Reported Resistance to Earth does not match manual site readings

Resistance-to-Earth may have changed during installation.

Pause the SA380-IT device and repeat manual readings to check for correlation

Resistance-to-Earth of complex circuits can be very dynamic. Readings may be fluctuating.

Observe SA380-IT readings in technicians mode for a time and note, minimum, maximum and average readings.

Pause the SA380-IT device and repeat manual readings for a similar period, noting minimum, maximum and average readings.

Check for correlation

Check that resistive cable modules has been used to make monitored circuit connections.
No GSM OperatorCheck the antenna connection is secure
Check that the antenna is well positioned
Ensure that the SIM is "active"
Replace antenna with high gain antenna
Poor GSM ReceptionCheck the antenna connection is secure
Check that the antenna is well positioned
Replace antenna with high gain antenna
No GSM IP Address

The SIM does not have the correct APN, or "Tariff" applied.

The APN settings are incorrect. Check these settings.
No Ethernet ConnectionCheck Cables are secure and that link and activity lights illuminate on the Ethernet port
Check that all IP settings are appropriate for the subnet to which the device is attached.
Check that the network to which the device is attached has firewall and routing rules in place to allow connection.
No Server Connection

Check that the EAMS server is operational and available

Check that the SA380-IT device has been "deployed" on the EAMS server
Check that the server setting of the device is correct
Check that the protocol setting is appropriate for your EAMS
FTP Upgrade is in process. Wait for the FTP upgrade attempt to complete (30 mins)
FTP Upgrade is in process. Upgrade firmware manually to skip
Can't activate Bluetooth using the touch panelForce the Bluetooth to become active by manually power-cycling the device.
Can't pair Bluetooth

Close the restart Mpec Connect

Go to your iPad/iPhone bluetooth settings screen and "forget" any SA380-IT devices. Restart Mpec Connect and attempt pairing again.
Hardware Fault Lit

Earth Loop is out of tolerance

Take measures to achieve a tolerable earth loop then manually reset interlocks.

Earth Loop is unstable

Take measures to achieve a tolerable earth loop then manually reset interlocks.

Circuit is under-voltage

Check wiring is correct then manually reset interlocks.

Circuit is under-voltage

Check nominal circuit voltage is configured appropriately then manually reset interlocks.

Circuit is over-voltage

Check wiring is correct then manually reset interlocks.

Circuit is over-voltage

Check nominal circuit voltage is configured appropriately then manually reset interlocks.

Live measurement screen displays Device Fault

Critical hardware failure. Remove the SA380-IT from service and replace.



5) Detailed Operation

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5.1) Front Panel Indications

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1POWER
OnOffFlash
Device has powerDevice un-powered or faultyDevice Faulty
2NETWORK
OnOffFlash
Connected to GSM NetworkNot connected to GSM network, or connected over EthernetDevice Fault
3SERVER
OnOffFlash
Connected to EAM serverNo connection to EAM server, or device in "fallback"Device Fault
4TEST
OnOffFlash
Self-test underwaySelf-test inactiveDevice Fault
5RUN
OnOffFlash
Software crash - device faultSoftware crash - device faultPulsates - Software running
6HW FAULT
OnOffFlash
Device  hardware fault, monitored  circuit voltage or earth loop irregularity Device OKDevice fault
7EARTH FAULT
OnOffFlash
One or more monitored circuits has a reportable earth fault.  Monitored Circuits OK.Device fault
8BLUETOOTH
OnOffFlash
Bluetooth active and paired to mobile device.Bluetooth radio inactiveBluetooth active and awaiting pairing



5.2) Connecting to the SA380-IT

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Mpec Connect & Bluetooth
  • Wireless configuration and diagnostics is facilitated by the "Mpec Connect" mobile app.
  • Mpec Connect is presently compatible with iPhone and iPad (Running iOS 13+)
  • Download and install the app by clicking on the icon below:

  • Permit the App to use bluetooth

  • The app will then attempt to pair with a nearby SA380-IT device
  • The SA380-IT has bluetooth disabled by default. It can be enabled by:
    • Restarting the device
    • Activating the module using the touch-sensitive front-panel

  • The bluetooth indicator will blink if the device is available for pairing.
  • If the App discovers only one SA380-IT, pairing will take place automatically.
  • If the App discovers multiple devices, the user will need to select the appropriate device to pair to.
  • Devices are listed by their unique serial number.

  • The presently connected device is indicated by the indicator.
  • A successfully paired device will show a solid blue bluetooth indication on the front panel.
  • The SA380-IT home screen will automatically load in the  device pane.

Bluetooth will switch off on the SA380-IT if the connection is left idle for 2 minutes. If this occurs, re-enable Bluetooth using the touch-sensitive front panel and reconnect to the device via the  view in the app.


You may need to set the time on the device if the SA380-IT is unable to locate a time-server using the GSM or Ethernet connections

The SA380-IT will not perform any measurements if the time is not set.

Local Connection with Ethernet
  • Wired configuration and diagnostics can be performed on any Ethernet enabled device that runs a modern web browser.
  • Connect Ethernet Cable.

The following instruction apply to the "Windows 10" operating system, however the network settings will be the same regardless of operating system.

  • Open Networks & Sharing Center:
  • Change Adapter Settings:
  • On "Local Area Connection", right-click, select "Properties":
  • Select "Internet Protocol Version 4 (TCP/IPv4)", then click "Properties":
  • Use the following IP settings, then click OK:


These settings assume that the SA380-IT resides on the 192.168.100.xxx sub-net. This is the default setting. If the IP address of your SA380-IT has been changed, You may need to change the IP settings above.

  • Connect to the web-based configuration and diagnostics tool using any HTML 5 compatible web browser.
  • Type the IP address of the SA380-IT into the address bar.
  • The default IP address is 192.168.100.115.

You may need to set the time on the device if the SA380-IT is unable to locate a time-server using the GSM or Ethernet connections

The SA380-IT will not perform any measurements if the time is not set.

Remote Fixed IP Connection

Configuration and diagnostics can be performed remotely via Ethernet or GSM when the SA380-IT is configured with a fixed, routable IP address.

This can be via a fixed LAN configuration:


or via a GSM connection that offers a fixed IP address:


Remote Ethernet and GSM connection requires a correctly configured LAN and/or SIM package. The set-up and provision of which is beyond the scope of this user guide.

The SA380-IT will offer 2 different IP addresses:


1IP address of the wireless GSM interface
2IP address of the wired Ethernet interface

Connect to the web-based configuration and diagnostics tool using any HTML5 compatible web browser.

Type the IP address (as referenced above) into the address bar to access the SA380-IT.

You may need to set the time on the device if the SA380-IT is unable to locate a time-server using the GSM or Ethernet connections

The SA380-IT will not perform any measurements if the time is not set.



5.3) Main Menu

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No.NameDescription
1TitleThe Main Menu title is simply "SA380-IT Insulation Monitor"
2SiteThe name of the installation. Can be changed in "Settings"
3Device IDThe unique ID of the device. Cannot be changed.
4Measurement DataClick here to access live measurement readings of monitored circuits.
5Device StatusClick here to access live connectivity and device health information.
6UtilitiesClick here to access engineering functions such as device and communications reset, time update and firmware upgrade.
7SettingsClick here to access all device settings.
8AboutClick here to view hardware and software build information.



5.4) Live Measurements

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No.NameDescription
1BackReturn to main menu
2Connection Status

A green dot indicates a live connection to the device.

A yellow dot denotes that the device has become unresponsive, but may recover.

A red dot denotes that the connection has been lost.

3TimeThe current time set on the device.
4AC Monitored CircuitAC monitored circuits show circuit voltage and equivalent resistance to earth (RL).
5Locked Monitored CircuitThis circuit is suffering from a lock-out condition hence no resistance to earth reading has been taken. Only voltage
6DC Monitored CircuitDC monitored circuits show circuit voltage and equivalent resistance to earth of each circuit leg (RB and RN).
7Earth Loop ResistanceThe resistance between FE and Loop Earth terminals.
8Current TestDisplays the test currently being performed by the device at the moment the page refreshed.
9Technicians ModeClicking on the white region of a monitored circuit or earth loop display will cause the device to enter technicians mode for that particular circuit.
10DisclaimerThe readings displayed on this screen show the measurements used to compute values that should be sent to the server-system. Measurements are scheduled to provide a balance between catching fast transient to earth faults, but also slower high-resistance / high-capacitance measurements for multiple circuits. To observe accurate and responsive measurement of a single circuit, use technicians mode.
11Green Text

..is used to denote monitored circuits where resistance to earth is above the defined alert thresholds.

..is used to denote that earth loop resistance is below the defined alert threshold.

12Orange Text..is used to denote monitored circuits suffering from a recoverable lock-out condition
13Red Text

..is used to denote monitored circuits where resistance to earth is below the defined alert thresholds.

..is used to denote that earth loop resistance is above the defined alert threshold.

..is used to denote monitored circuits suffering from an unrecoverable lock-out condition

InfoMissing CircuitsOnly monitored circuits configured for measurement are displayed.

For a full description of device lock-out behaviour, and the status and meaning of resistance-to-earth readings, see the Principals of operation section of this user guide.



5.5) Technicians Mode

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No.NameDescription
1BackNavigates back to the live measurements screen and terminates technicians mode.
2Circuit Name & Connection Status

The name of the monitored circuit. 

A green dot indicates a live connection to the device.

A yellow dot denotes that the device has become unresponsive, but may recover.

A red dot denotes that the connection has been lost.

3DumpDisplays a detailed diagnostic data dump (for manufacturers use).
4TimeThe current time.
5VoltageThe monitored circuits present voltage. Not displayed if earth loop resistance has been selected.
6Avg / Min / MaxAverage, minimum and maximum voltage readings since technicians mode was entered or statistics reset.
7Resistance

AC monitored circuits show equivalent resistance to earth (RL).

DC monitored circuits show equivalent resistance to earth of each circuit leg (RB and RN).

The Earth Loop circuit shows the present resistance between FE and Loop Earth terminals.

8Avg / Min / MaxAverage, minimum and maximum resistance readings since technicians mode was entered or statistics reset.
9Reset StatisticsReset all the average, minimum and maximum statistics for the page.
10Technicians Mode

Whilst in technicians mode, only the selected circuit is measured. This improves response time for the circuit of interest to aid faulting activities.

No other monitored circuit is measured, earth loop resistance is not measured (unless selected), device integrity checks are not performed.

The user should manually exit technicians mode when it is no longer required such that other measurements recommence.

If the user should forget to leave technicians mode, normal mode will automatically resume after a period of 4 hours.

infoGreen Text

..is used to denote monitored circuits where resistance to earth is above the defined alert thresholds.

..is used to denote that earth loop resistance is below the defined alert threshold.

infoOrange Text.is used to denote monitored circuits suffering from a recoverable lock-out condition
infoRed Text

..is used to denote monitored circuits where resistance to earth is below the defined alert thresholds.

..is used to denote that earth loop resistance is above the defined alert threshold.

..is used to denote monitored circuits suffering from an unrecoverable lock-out condition



5.6) Device Status

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No.NameDescription
1BackNavigates back to the main menu
2Connection Status

A green dot indicates a live connection to the device.

A yellow dot denotes that the device has become unresponsive, but may recover.

A red dot denotes that the connection has been lost.

3TimeThe current time.
4Device StatusShows if the device is presently paused or in technicians mode
5Hardware FaultWill be present if the HW FAULT indication is lit. See device syslog for detailed diagnostics.
6Earth FaultWill be present if the EARTH FAULT indication is lit. See live measurements for detailed diagnostics.
7Server Connection

The text Indicates the present server protocol followed by the server connection method:

Protocol

RDAQMpec RailDAQ protocol in use
MIMOSANetwork Rail MIMOSA protocol in use
FTPNetwork Rail firmware update in progress


Bearer

GSMThe connection is using the GSM modem
EthernetThe connection is using the LAN port


Connection Status

BlackServer connection is not initialised - please wait.
Red

...when connection is first established: The server has yet to be contacted.

...after which: The server can not be reached.

If using the MIMOSA protocol, the device can reside in a prolonged "back-off" state for up to 4 hours. During this period the SA380-IT will not attempt re-connection.

If connection remains "red" for more than 10 minutes in the case of the MPEC RailDAQ protocol, or 4 hours in the case of the MIMOSA protocol, refer to the troubleshooting steps.

Orange

Indicates that "handshaking" events have taken place with the server, but no data has been sent.

If the connection remains "orange" for more than 2 minutes, refer to the troubleshooting steps.

GreenThe SA380-IT is connected to the server side system and data is being successfully transmitted.
8Wireless Operator

Displays the connection state of the modem:

Blank: Modem not configured.

Waiting for Modem: The SA380-IT is waiting for the modem to power-up.

Searching: The modem is searching for an operator.

Operator Name: When registered with an operator, the operator name, and GSM signal strength is displayed.

Signal Strength:

BarsMeaning
1Poor - Requires improvement
2OK - May struggle at times
3Good - No action required
4Excellent - No action required
9Wireless IP

The IP address obtained by the modem for the GPRS data session:

Blank: GSM modem off or not registered with a carrier.

Valid IP Address: GPRS session successfully established.

10Ethernet IP

The SA380-IT does not support DHCP, and can therefore not request an IP from another device.

The Ethernet IP address is "static" and assigned by the user through configuration. It is the configured IP address that is displayed here.

11Queued EventsHow many data events are awaiting transmission to the server.
12TemperatureInternal temperature of the SA380-IT.
13Run TimeHow long the SA380-IT has continuously operating since last reboot.



5.7) Utilities

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No.NameDescription
1Back

Navigates back to the main menu.

2

Pause Data Collection /

Resume Data Collection

This toggles the SA380-IT between paused mode and normal mode.

The SA380-IT will not attempt any measurement during suspended mode, nor connect any monitored circuit to the measurement circuitry or earth. 

The user should manually exit suspended mode when it is no longer required such that measurements recommence.

If the user should forget to terminate suspended mode mode, normal mode will automatically resume after a period of 4 hours.

3Reset Safety Interlocks

This will immediately clear any safety interlocks that are presently restricting measurement.

Ensure that you have exhausted all fault finding tasks prior to manually resetting any device interlock.

4System LogOpens the System log page to retrieve detailed diagnostic data.
5Restart Communications

This will drop any existing communication link and attempt to build up the link again from scratch.

When using the MIMOSA protocol this will reset any back-off period.

When using the GSM modem, the modem will restart.

6Clear QueueThis will erase all pending messages waiting to be sent to the server. The data will be permanently lost.
7Set Time From BrowserThe SA380-IT requires the time to be set before measurement can commence. This is normally done through connection to time server. In the event that a time server is unavailable the time can manually be set using this feature.
8RebootPerforms a software restart of the device.
9Firmware UpdateOpens the Firmware update screen.



5.8) Syslog

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User Interface

No.NameDescription
1Back

Navigates back to the main menu.

2Start Date / TimeThe time and date from which you wish to interrogate the system logs. The default setting on one hour in past. 
3End Date / TimeThe time and date at which you wish to finish interrogating the system logs. The default setting on 24 hours hence.
4System Log Filter

Filters the System Log to show either "Analogue Data" (Measurements) or "Syslog" (event log) events.

5SearchClick ./ Tap to begin search. Be aware this can take some time, especially on slow 2G GSM connections.

No.NameDescription
1Back

Navigates back to the System Log menu

2Date / Time stampThe time and date of the system log entry
3ChannelThe channel to which this measurement belongs.
4Value

The value of the measurement.


No.NameDescription
1Back

Navigates back to the System Log menu

2Date / Time stampThe time and date of the system log entry
3Entry TypeThe type of System Log entry (See table below)
4Additional Info

Many syslog entries contain additional informative text that describe system behaviour. (See table below)

Syslog Codes

A brief description of System Log entries is shown below. If further detailed technical advice is sought. Please contact Mpec for support.

Syslog EntryDescription
Interlock state [reason] [circuits]

A new interlock has fired....

[reason] explains the reason for the interlock system log entry.

See the principles of operation section for a definitive list of all interlock types.

[circuits] lists the affected circuits in the format e:- b:-----

e: represents the Earth Loop Health

b: represents the health of the internal test circuit and five monitored circuit inputs. This is indexed with the Internal test circuit first, followed by the five monitored circuits.

'-' represents a healthy circuit

'V' represents a voltage fault on the affected circuit

'E' represents an earth fault on the affected circuit

so, for instance

Interlock State Overvoltage e:- b:--VV-- means

  • An over-voltage condition is detected
  • monitored circuits 2 and 3 are affected. (remember to count circuits from zero)
Centrix connectedConfirmed as connected to a Centrix server.
Centrix disconnectedConfirmed as disconnected from a Centrix server.
Config changed by remote userConfiguration changed via Bluetooth, or via web-pages.
Config changed by MIMOSAConfiguration changed by the Network Rail II server.
Interlocks clearedUser issued "reset interlocks" command
Logger activeSA380-IT has booted and is now running.
Mimosa client endedDevice will now send MIMOSA messages
Mimosa server endedDevice no longer listening for MIMOSA messages
FTP handlerDevice is attempting firmware upgrade
FTP download errorAn error has occurred during FTP firmware upgrade
M My IPRecords the IP address used by the device
M My IP changed!Records changes to the IP address
M Rx HTTP errorLogs HTTP error response codes from the server.
M Rx No response from core sysThe Network Rail II system is unreachable due to lack of connectivity or the server is not running.
M Rx HTTP 200 - OKThe last message sent to the server was accepted.
M Tx abortedMessage transmission aborted due to timeout - unable to connect to the server, or transmission took too long.
M Tx Fallback forThere will be a fallback "delay" before attempting to send another message.
Queue InformationInvalid queue update attempted (RailDAQ mode).
Modem commandDisplayed the last command sent to the device modem.
Modem command failedThe modem failed to respond to the last modem command.
Modem power offThe modem has been turned off.
Modem power onThe modem has been turned on.
Restarting systemThe SA380-IT is about to restart
Sending SNTP requestThe device is attempting a time-sync.
SNTP responseThe device has received a time-sync update.
SNTP timeoutThe time-sync attempt has failed
SNTP set timeThe device has updated its time.
Thread watchdog eventSoftware error.



5.9) Firmware Update

 Click here to expand...
Download & Select Firmware

No.NameDescription
1Back

Navigates back to the Utilities menu.

2Current VersionDisplays the Firmware Version currently installed.
3Get Latest Firmware

The will open the official "Mpec firmware dowloads page" in a new boweser window.
This facilitates download of the latest recomended firmware packages.

  • Mpec Centrix users should always apply "Centrix Approved" firmware.
  • Network Rail II/RADAR users must only ever apply "NR II Approved" firmware.
4Select Firmware Package

Select a firmware package previously downloaded.

The user interface will differ between iPhone and standard web-browser.

iPhone - find firmware files by selecting browse.

Mac/PC - Use the standrad finder/file explorer interface.

Once a valid firmware package is selected, the user interface will update. (see below)

Upgrade SA380-IT Firmware

No.NameDescription
1Filename

Displays the filename of the selected firmware package

2Package Version

Displays the official firmware version of the selected package.

3Upload Firmware

Once activated, upload of the new firmware package to the SA380-IT will begin. 

4Progress Bar

Displays the current progress of the firmware upload process.

Do not navigate away from the firmware update page during the firmware upgrade operation. This will terminate the upgrade process.

Once upload if complete, the SA380-IT will restart in order to complete the programming cycle.

You may need to reconnect after reboot if using bluetooth.



5.10) Settings

 Click here to expand...

No.NameDescription
1Back

Navigates back to the main menu

2Device Name

You may change the name of device. The device name is displayed on all diagnstics tool pages and in your Enterprise Asset Managemet System.

3Circuit Settings

To configure each of the five input circuits, select the circuit of interest here.

4Autodetect Circuits

Autodetct Circuits runs a setup "wizard" to enable rapid comissioning of the SA380-IT. The detailed operation of Autodetect Circuits is found below.

The Autodetect process will reset any active device interlocks. Ensure that any active interlocks have been investigated prior to proceeding.

5Earth Loop NameYou may change the name of the "Earth Loop" channel here. This will change the display name of the "Earth Loop" channel in Live Measurements and in your Enterprise Asset Managemet System.
6AdvancedProvides access to Advanced Settings that do not typically need to be altered in the vast number of installations.



5.11) Circuit Settings

 Click here to expand...

No.NameDescription
1Back

Navigates back to the Settings menu

2Name

You may change the name of the circuit here. This will change the display name of the circuit in Live Measurements and in your Enterprise Asset Managemet System.

3Voltage

The nominal voltage of the monitored circuit.

Nominal voltage is used to drive important safety features of the SA380-IT

It is important that this is set correctly.

Nominal voltage may be set incorrectly due to:

  • The voltage being uncommon, hence autodetect failed to correctly identify the target voltage.
  • The circuit voltage is high. This can commonly be found in railway circuits with long cable runs and heavy loads.

Enter a nominal voltage that aligns with typical measured voltage of the circuit in question:

4AC/DC

Select if the monitored circuit is AC or DC.


The AC/DC setting changes:

  • how voltage readings are calculated and displayed
  • Threshold setting used to trigger data acquisition (Network Rail mode only)

Setting this incorrectly may produce misleading data that can compromise system safety.



5.12) Auto-Detect Circuits

 Click here to expand...

No.NameDescription
1Back

Navigates back to the Settings menu

2Detected VoltageGreen text denotes that a valid voltage has been detected on this input channel and that a circuit has been configured for measurement.
3Measured Voltage

The type (AC or DC) and magnitude of the voltage measured during the autodetect process.

4Nominal Voltage

Shows the nominal voltage auto-configured for this circuit.

The Autodetect process will attempt to match the measured voltage to the nearest common "railway" voltage.

  • BX110
  • B120
  • B50
  • B24
  • B12

Nominal voltage is used to drive important safety features of the SA380-IT

It is important that this is set correctly.

Nominal voltage may be set incorrectly due to:

  • The voltage being uncommon, hence autodetect failed to correctly identify the target voltage.
  • The circuit voltage is high. This can commonly be found in railway circuits with long cable runs and heavy loads.

Enter a nominal voltage that aligns with typical measured voltage of the circuit in question:

5Reverse Voltage

Red text denotes a DC circuit that has been connected with incorret polarity. This circuit will not be configured and must be corrected.

6Unused CircuitInput channels with no voltage present will not be configured for measurement when using Autodetect.



5.13 Advanced Settings

 Click here to expand...

No.NameDescription
1Back

Navigates back to the Settings menu

2Device ID

Set to the device serial number.

This is for information only. It cannot be changed.

3Manufacturer ID

Mpec's unique SA380-IT manufacturer ID used by the Network Rail MIMOSA protocol only.

This is for information only. It cannot be changed.

4Server Name

The hostname or IP address of the Enterprise Asset Management system you wish to connect to.

Common Server Names:

Mpec Centrix
centrix.org
Network Rail II/RADAR
iihome.hiav.networkrail.co.uk

Default Server: raildaq.com

The default server is a public server managed by Mpec. It is not intended for use with "live" deployed SA380-IT devices.


The default "raildaq.com" server provides a place for orphaned SA380-IT devices that have lost their configration to connect to. This allows Mpec to support such devices.

5Server Protocol

See Data Acquisition section for more detail.

MIMOSA (NR)Force use of Network Rail MIMOSA protocol and acquisition rules.
RailDAQ (Mpec)Force use if Mpec RailDAQ protocol and acquisition rules.

Automatic

Use the most appropriate protocol and acquisition rules for the server to which you are connected.
6Server Connection Type

How to attempt data connection to the server system:

AnyAttempt connection on both GSM and Ethernet interfaces. Robust but can extend reconnection times.
GSMExclusive use of the GSM radio.
EthernetExclusive use of the Ethernet port
7SNTP Time Server

The name of a viable Simple-Network-Time-Protocol server.

The SA380-IT will attempt to reach this server in order to set the time on the device at boot, and then once every hour.

If connected to a MIMOSA server, you may find that the SNTP time server field has been overwritten at the request of the MIMOSA server.

This is because MIMOSA servers instruct which time server the field device is to use.

If connected to a RailDAQ server, the SNTP time service is not strictly required, and the field may be left blank.

The default SNTP time server is resolvable on the public Internet. LAN / APN firewalls may prevent this being resolvable.

8APN

Access-Point-Name.

The APN is the name of the gateway between the GSM modem and a computer network.

The APN is provided by your SIM provider and dictates which network you connect to.

Common APNs:

mobile.o2.co.uk
The O2 network APN for connection to the public Internet
ii-static.corp.ukrail.net
The Network Rail private LAN connection over the O2 celluar network. The public Internet is not accessable.

The default APN allows connection to the public Internet on the O2 celluar network.

The default APN allows orphaned SA380-IT devices that have lost their configration to connect back to Mpec. This allows Mpec to support such devices.

9APN Username

Some APNs require a valid username in order to permit connection to a data network.

The APN username will be provided by your SIM provider.

10APN Password

Some APNs require a valid password in order to permit connection to a data network.

The APN password will be provided by your SIM provider.

11Ethernet IP Address

The IP address of the SA380-IT on the Ethernet interface.

The IP address must be compatible with your local network settings, including:

  • point-to-point connection to a laptop
  • connection to a corporate LAN

The SA380-IT does not support DHCP. IP settings must be configured manually.

The default IP address of the device upon shipment is:

192.168.100.115

12Ethernet Net Mask

Ethernet Subnet Mask:

Used to define the network subnet of the LAN to which the SA380-IT is connected.

The subnet mask must be compatible with your local network settings, including:

  • point-to-point connection to a laptop
  • connection to a corporate LAN

The SA380-IT does not support DHCP. IP settings must be configured manually.

The default subnet mask of the device upon shipment is:

255.255.255.0

13Ethernet Default Route

Used to define the default network gateway (route) between the SA380-IT subnet and the wider LAN / Internet. 

The defualt route must be compatible with your LAN network settings to enable the SA380-IT to reach your Enterprise Server.

The SA380-IT does not support DHCP. IP settings must be configured manually.

The default route of the device upon shipment is:

192.168.100.1

14Primary DNS Server

Primary Domain Name Server.

1st Choice name server to use to resolve SNTP and Server hostnames into IP addresses.

The domian name server must be compatible with your LAN network settings to enable the SA380-IT to reach your Enterprise Server.

The SA380-IT does not support DHCP. IP settings must be configured manually.

The default primary DNS server will be resolvable when connected to the public Internet.

15Secondary DNS Server

Secondary Domain Name Server.

2nd Choice name server to use to resolve SNTP and Server hostnames into IP addresses.

The domian name server must be compatible with your LAN network settings to enable the SA380-IT to reach your Enterprise Server.

The SA380-IT does not support DHCP. IP settings must be configured manually.

The default secondary DNS server will be resolvable when connected to the public Internet.

16Operating Mode
StandaloneAct as an independent device, sending all readings direct to an Enterprise Server system.
Slave

Synchronises and sends all measurement data over RS485 to a master Mpec SA380TX device. Does not send data to an Enterprise Server system.

SLAVE MODE IS NOT PRESENTLY SUPPORTED.

17AC SettingsOpens a menu that governs advanced setting regarding AC circuit data acquisition.
18DC SettingsOpens a menu that governs advanced setting regarding DC circuit data acquisition.
19Earth Loop SettingsOpens a menu that governs advanced setting regarding Earth Loop data acquisition.
20Voltage Acquire-on-Change (%)

Governs the sensistivity of voltage data acquisition on all circuits.

A new sample will be acquired whenever the voltage on a given circuit is observed to have changed by more than n% of it's previous reading.

At low circuit voltages, acquisition is limited to changes no smaller than 0.1 V to prevent high data volumes.

21Global Alert Hysteresis

Governs a hysteresis window for Earth-Loop out-of-tolerance state. For instance, if the earth loop out-of-tolerance level is set to 1,000 Ω and hysteresis is to set to 10%, then an out-of-tolerance earth loop reading must return to 900 Ω or less before the alert condition may clear. Alert clearance is sill subject to the alarm reset conditions also being satisfied.


Network Rail MIMOSA mode only

Governs a hysteresis window for DC Offset on AC Circuit Threshold. For instance, if DC Offset on AC Circuit Threshold is set to 11% and hysteresis is to set to 10%, then the level of DC offset on an AC circuit must return to 9.9% of the test-pulse signal level, or less before the alert condition may clear. Alert clearance is sill subject to the alarm reset conditions also being satisfied.

22Relay Alarm Dwell Time (Sec.)

Governs the minimum operation time of the volt-free contact output. A minimum operation time is specified to prevent:

  • the relay output "chattering" in the event of a a transient fault
  • short duration transient faults being "missed" by external equipment that is slow to respond.
23Unstable Measurement Alert Threshold (%)

Network Rail MIMOSA mode only

The SA380-IT tracks the percentage of failed measurements over a given reporting period on each circuit using Mpec's propriatary transient detection technology. If the percentage of failed measurements in a reporting period exceeds this thresold, then the UNSTABLE MEASUREMENT status-bit is set for the effected circuit and sent to the server. 

24Alarm Reset Delay

Governs the recovery process for non-critical device interlocks (alarm conditions) 

Measurement of input circuits will recommence under the following circumstance:

Immediate

Restarts as soon as the fault condition has been proven to be clear. 

NOT PRESENTLY SUPPORTED

DelayedRestarts if the fault condition has been proven to be continously clear for the device reporting period
ManualMeasurement will only restart once a manual Reset Device Interlocks command is issued

See Principals of Operation for a full discription of non-critical device interlocks

25Fast Scan (Sec. per Circuit)

This setting is obsolete and scheduled for removal.

The setting does not govern anything.

26Medium Scan (Sec. per Circuit)

Network Rail MIMOSA mode only

If measurement time of an individual circuit exceeds the medium scan setting, the Long Scan Mode status bit is set for the effected circuit and sent to the server.

27Slow Scan (Sec. per Circuit)

Network Rail MIMOSA mode only

If measurement time of an individual circuit exceeds the long scan setting, the Time Out status bit is set for the effected circuit and sent to the server.

28Mimimum Reporting Period (Mins.)

Governs:

  • the minimum frequency of reported measurements to the server.
  • the amount of time a circuit needs to be "fault-free" in the event of an interlock/alarm condition
  • The period over which the percentage of succesfull / failed circuit measurement attempts is evaluated.

    The way in which data in reported in Network Rail MIMOSA and Mpec RailDAQ mode differ. See the Data Acquisition section for detailed information.

29Self-Test Interval (secs.)

The number of seconds between self-test cycles.

Sets the maxium period a fault can exist prior to detection.

Increased frequency has a marginal impact on device responsiveness.

30Calibration Interval (secs.)

The number of seconds between calibration cycles.

Increased frequency has a marginal impact on device responsiveness. Reduced frequency has a marginal impact on accuracy.

31MIMOSA Buffer Size

Network Rail MIMOSA mode only

Controls how many samples to buffer before constructing a MIMOSA message.

Waiting for messages to buffer increases coms efficiency, but incurs a delay in sending data to the server. Buffer size controls how efficiently the data packets can be assembled.

It is recomended to not exceed a setting of 20 samples, and this is the maximum number of samples that the SA380-IT can combine into a single MIMOSA message.

32MIMOSA Buffer Timeout (secs.)

Network Rail MIMOSA mode only

Controls how long messages can wait in the messaging buffer before constructing a MIMOSA message.

Waiting for messages to buffer increases coms efficiency, but incurs a delay in sending data to the server. Buffer timeout limits this delay.

33Append Device ID to Channels

The operation of the Network Rail II/RADAR server makes it diffcult to ascertain which field device a data channel belongs to. Appending the device ID to each channe name eases idintification of data channels is this server system.

UnappendedBX110There will be many channels named BX110
Appended10345:BX110This BX110 channel belongs to device no. 10345
34FTP Server

Network Rail MIMOSA mode only

The hostname of the Network Rail II/RADAR FTP server for firmware upgrade.

The SA380-IT will attempt to connect to this server upon start-up, and the between 2 AM and 4 AM UTC each day.

If connection is succesful and new firmware is found, device firmware will be automatically downloaded and installed.

Automated FTP firmware upgrade is only supported in Network Rail MIMOSA mode.

No FTP upgrade attempt will be made in RailDAQ mode.

Automated FTP firmware upgrade attempts can be inhibited by setting the field to be blank.

35FTP Username

Network Rail MIMOSA mode only

The FTP server requries a username. This is specified by the FTP server administrator.

36FTP Password

Network Rail MIMOSA mode only

The FTP server requries a password, This is specified by the FTP server administrator.

37FTP Path

Network Rail MIMOSA mode only

This specifes the "file path" on the FTP server in which to look for new SA380-IT firmware. This is specified by the FTP server administrator.



5.14) AC Settings

 Click here to expand...

No.NameDescription
1Back

Navigates back to the Advanced Settings menu

2Clear Threshold

AC Circuits - Network Rail MIMOSA mode only

A level at which to trigger an "Acquire on threshold breach" measure of resistance-to-earth, where measured resistance is observed to have transitioned across the clear threshold in the rising direction.

3Notify Threshold

MIMOSA and RailDAQ Modes:

The EARTH FAULT indication will extinguish if all circuits record a a resistance-to-earth above the notify threshold

AC Circuits - Network Rail MIMOSA mode only

A level at which to trigger an "Acquire on threshold breach" measure of resistance-to-earth, where measured resistance is observed to have transitioned accross the notify threshold in either a rising or falling direction.

4Reportable Threshold

MIMOSA and RailDAQ Modes:

The EARTH FAULT indication will illuminate if any circuit records a resistance-to-earth below the reportable threshold

AC Circuits - Network Rail MIMOSA mode only

A level at which to trigger an "Acquire on threshold breach" measure of resistance-to-earth, where measured resistance is observed to have transitioned accross the reportable threshold in either a rising or falling direction.

5Minimum Acceptable Threshold

AC Circuits - Network Rail MIMOSA mode only

A level at which to trigger an "Acquire on threshold breach" measure of resistance-to-earth, where measured resistance is observed to have transitioned accross the minimum acceptable threshold in either a rising or falling direction.

6Saftey Minimum Threshold

AC Circuits - Network Rail MIMOSA mode only

A level at which to trigger an "Acquire on threshold breach" measure of resistance-to-earth, where measured resistance is observed to have transitioned accross the safety minimum  threshold in the falling direction.

7DC Offset on AC Circuit Threshold

AC Circuits - Network Rail MIMOSA mode only

A level of common-mode voltage observed on AC circuits relative to the applied measurement pulse voltage (13 V), as observed during resistance-to-earth measurement.

If this level is exceeded, the DC obsserved on AC bubar status bit is set for the affected circuit.



5.15) DC Settings

 Click here to expand...

No.NameDescription
1Back

Navigates back to the Advanced Settings menu

2Clear Threshold

DC Circuits - Network Rail MIMOSA mode only

A level at which to trigger an "Acquire on threshold breach" measure of resistance-to-earth, where measured resistance is observed to have transitioned across the clear threshold in the rising direction.

3Notify Threshold

MIMOSA and RailDAQ Modes:

The EARTH FAULT indication will extinguish if all circuits record a a resistance-to-earth above the notify threshold

DC Circuits - Network Rail MIMOSA mode only

A level at which to trigger an "Acquire on threshold breach" measure of resistance-to-earth, where measured resistance is observed to have transitioned accross the notify threshold in either a rising or falling direction.

4Reportable Threshold

MIMOSA and RailDAQ Modes:

The EARTH FAULT indication will illuminate if any circuit records a resistance-to-earth below the reportable threshold

DC Circuits - Network Rail MIMOSA mode only

A level at which to trigger an "Acquire on threshold breach" measure of resistance-to-earth, where measured resistance is observed to have transitioned accross the reportable threshold in either a rising or falling direction.

5Minimum Acceptable Threshold

DC Circuits - Network Rail MIMOSA mode only

A level at which to trigger an "Acquire on threshold breach" measure of resistance-to-earth, where measured resistance is observed to have transitioned accross the minimum acceptable threshold in either a rising or falling direction.

6Saftey Minimum Threshold

DC Circuits - Network Rail MIMOSA mode only

A level at which to trigger an "Acquire on threshold breach" measure of resistance-to-earth, where measured resistance is observed to have transitioned accross the safety minimum  threshold in the falling direction.



5.16) Earth Loop Settings

 Click here to expand...

No.NameDescription
1Back

Navigates back to the Advanced Settings menu

2Earth Loop Acquire on Change

This setting is deprecated and will shortly be removed.

The settings has no effect.

3Earth Loop Alert Level

The SA380-IT will cease resistance-to-earth meseaurement if the earth-loop resistance exceeds this threshold. 

Resistance-to-earth meseaurement will recommence if the earth-loop resistance is lower than this threshold and the alarm reset conditions have been satisfied.

MIMOSA and RailDAQ Modes:

The HW FAULT indication will illuminate if earth-loop resistance exceeds this threshold. 

Network Rail MIMOSA mode only

This condition will set the Earth Loop Unstable flag.

4Measurement Frequency

Governs how often earth-loop resistance measurements are performed.

Sets the maxium period a fault can exist prior to detection.

Increased frequency has a marginal impact on device responsiveness.

5Earth Loop Stability Flag Threshold

The SA380-IT will cease resistance-to-earth meseaurement if the consecutive earth-loop resistance differ by a margin greater than this threshold.

Resistance-to-earth meseaurement will recommence if consecutive earth-loop resistance readings differ by less than this threshold and the alarm reset conditions have been satisfied.

MIMOSA and RailDAQ Modes:

The HW FAULT indication will illuminate if consecutive earth-loop resistance readings differ by more than this threshold. 

Network Rail MIMOSA mode only

This condition will set the Earth Loop Unstable flag.



5.17) About

 Click here to expand...

No.NameDescription
1Back

Navigates back to the Main menu

2Name & Decription

Lists the product name for information only

3Version

Lists the current firmware version for information only


4Build Date

Lists the firmware build date for information only

5User Guide

A handy link to this documentation.



6) Faulting and Maintenance

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6.1) Fault Finding

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Run time Fault

Run light latched

Device keeps restarting

Coms Fault

No GSM registration

No GSM Data connection

No server connection over GSM

No server connection over Ethernet

On-Site Connection Problems

Bluetooth Connection Issues

Ethernet Connection Issues

Hardware Fault

Hard Interlocks

Internal Offset Fault

Device Fault

Internal Measurement Fault

Soft Interlocks

Alarm Reset Conditions

Unstable Measurement - Not actually a deivce fault - Refer to technicians mode measurement

Earth Loop negative

Earth loop out of range

Earth Loop unstable

under voltage

over voltage

Earth Fault

Not a device fault - Refer to technicians mode section



6.2) Maintenance

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Coming soon.



7) Principals of Operation

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7.1) Measaurement Fundamentals

 Click here to expand...

Coming soon.



7.2) Voltage Measurement

 Click here to expand...

Coming soon.



7.3) AC Resistance to Earth Measurement

 Click here to expand...

Coming soon.



7.4) DC Resistance to Earth Measurement

 Click here to expand...

Coming soon.



7.5) Steady State Esitmation Technology

 Click here to expand...

Coming soon.



7.6) Transient Detection Technology

 Click here to expand...

Coming soon.



7.7) Earth Integrity Measurement

 Click here to expand...

Coming soon.



7.8) Periodic Self-Test

 Click here to expand...

Coming soon.



7.9) Normal Mode Operation

 Click here to expand...

Coming soon.



7.10) Technicians Mode Operation

 Click here to expand...

Coming soon.



7.11) Adbnormal Mode Operation

 Click here to expand...

Coming soon.



8) Data Acquisition

 Click here to expand...



8.1) Mpec (RailDAQ) Mode

 Click here to expand...

Coming soon.



8.2) Network Rail (MIMOSA) Mode

 Click here to expand...

Coming soon.



9) Technical Data

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9.1) Specification Data

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Insulation Coordination to EN50124-1 & EN60101-1



Nominal System Supply Voltage (UN) (110 V AC Variant)AC 110 V RMS
Nominal System Supply Voltage (UN) (12 V DC Variant)DC 12 V 
Over-voltage CategoryCAT IV
Rated Impulse Voltage Withstand (UNi)4 kV
Pollution Degree3
Rated Insulation Voltage (UNm)AC 185V RMS
Inter-Monitored Circuit Isolation Voltage (Galvanic)+/- 400 V PeakMin.
Inter-Monitored Circuit Protective Impedance (in break-down)140 kΩMin.
All devices undergo factory Hi-Pot testing

Supply Voltage



Operating Voltage Range  (110 V AC Variant)

AC/DC 40-160 V RMS

+15%
Operating Frequency Range (110 V AC Variant)DC to 60 Hz
Operating Voltage Range  (12 V DC Variant)

DC 10-16 V

+15%
Max. Power Consumption6 VA

Monitored Circuits Voltage



Number of Independent Circuits Monitored5AC or DC
Operating Voltage Range

AC 5-160 V RMS

DC 5-160 V RMS

+15% 

+15%

Operating Frequency RangeDC to 60 Hz
Voltage Accuracy+/- 5 %

>= 1 V

Monitored Circuits Insulation Resistance



Equivalent Resistance to Earth

(RL = RB//RN)

0 Ω to 5 MΩAC Circuits

Actual Resistance to Earth

(RB and RN)

Ω to 5 MΩDC Circuits
Accuracy*

+/- 1 kΩ

ZL < 20 kΩ

+/- 5 %

ZL >= 20 kΩ

Z<= 1 MΩ

Alarm Response Value

Configurable

1 kΩ to 1 MΩ

Factory set at:

150 kΩ for DC

50  kΩ for AC

Alarm Hysteresis

Configurable

1 kΩ to 1 MΩ

Factory set at:

+150 kΩ for DC

+50  kΩ for AC

Standard Response Time (per circuit) TR1.5 sTypical

Maximum Response Time (per circuit) TR

750,000 x CE


seconds
Product Response TimeTR X Number of Circuits in OperationTypical

System Leakage Capacitance (CE)

(per circuit)

100 μF

Max.

*See section ? for an explanation of measurement accuracy with regard to the insulation resistance of DC monitored circuits.


Measuring Circuit



Measuring Voltage+/- 13 V
Measuring Current< 200 μA
Internal Resistance & Impedance> 45 kΩno resistive cable fitted
System Resistance & Impedance> 70 kΩresistive cable fitted

Measuring Circuit is only connected to a

single Monitored Circuit at any one time



Internal System Check Frequency300 s

Earth Loop Circuit



Measuring Voltage+/- 3.5 V Max.
Measuring Current< 1 mA
System Resistance & Impedance> 25 kΩFE to SE
Tolerance to Stray Interference Voltage+/- 1,100 mV DC.
+/- 850 mV AC.Peak,
Measurement Range0 Ω to 1.1 kΩ

Accuracy

+/- 0.5 Ω

RE < 10 Ω


+/- 5 %

RE >= 10 Ω

Alarm Value

Configurable

0 Ω to 1 kΩ

Factory set at

1 kΩ

Alarm Hysteresis

Configurable

0 % to 100 %

Factory set at

10 %

Output Ports & Radio



Auxiliary Power Output

Voltage

 5 V +/- 10 %

Power1 W +/- 10 %
Volt-Free ContactFormN.O. SPST 
Withstand Voltage+/- 160 V Max.
Contact On Resistance0.75 Ω Max.
Contact Off Resistance1 MΩ Min.
Max. Current1 A AC RMS or DC

Serial Data Output

EIA RS485

115,200 bps Max.

EthernetRJ45

10/100 Mbps

Auto MDIX

Wireless Modem
(SIM Factory Fitted)
SMA (Female)GSM 2G GPRS
BluetoothTouch to EnableBluetooth Low Energy


Supported Protocols



MPEC RailDaq

Efficient Data Communications

LAN/GSM

RS485

TCP/IP Port 7777

112,800 bps

Network Rail MIMOSA

Verbose Data Communications

LAN/GSM

TCP/IP Port 80

SNTP

Time Synchronization

LAN/GSM

UDP Port 123


HTTP

Configuration and Live Data

LAN/GSM

TCP/IP Port 80

FTP

Firmware Upgrade for NR users

LAN/GSM

FTP Port 21 (Outbound)

FTP Port 1024–65535 (Inbound)

Environmental



EMC Emissions & Immunity

EN50121-4


Surge Immunity: Monitored Circuits & Earth

EN61000-4-5

4kV

Voltage Withstand

EN50124-1

EN61010-1


Climatic ClassEN50125-3T1 In cubicle

Ambient Operating Temperature

-25 °C to +70 °C


Storage Temperature-40 °C to +85 °C
Humidity5 % to 100 %Condensing
Vibration

2.3 m/s2


3 - axis'
Impact ProtectionIK06
Ingress ProtectionIP52
Flammability RatingUL94 V0

Installation Data



Mounting

BR930 / Q Style Mounting Plate


Primary Connections

Wire Size: 2.5 mm2 max.

Spring Clamp

Auxiliary Connections

Wire Size: 1.5 mm2 max.

Spring Clamp

Weight350g


9.2) Ordering Details

 Click here to expand...


Description

MPEC Part No.

NR PADs No.

SA380-IT Multiple Bus-Bar Insulation Monitor Device.

110 V AC Power Supply

Without cables and crimps

SA380-IT-NR0086/000416

SA380-IT Multiple Bus-Bar Insulation Monitor Device.

110 V AC Power Supply

With cables and crimps

SA380-IT-SD0086/000417

SA380-IT Multiple Bus-Bar Insulation Monitor Device.

12 V DC Power Supply

With cables and crimps

SA380-IT-LVNA
Cable & Crimp kitSA380-IT-CK0086/000418
SA380-IT Spare Connector SetSA380-IT-CN0086/000419
SA380-IT 47KΩ Resistive Cable - 3 metersCOM-IT-RESCABNA
SA380-IT Hand-held Configuration and Diagnostics DeviceSA380-IT-CD0086/000422
SA380 Series Hinged Wall BracketBRK-HINGE0086/000423
Contents: SA380-IT-NR

Qty

SA380-IT Module - 110 V AC1
M5 Spring Washer2
M5 Nut2
10 Way 5 mm Pitch Connector1
6 Way 5 mm Pitch Connector1
6 Way 3.5 mm Pitch Connector1
GSM Antenna1
Contents: SA380-IT-SD

Qty

SA380-IT Module - 110 V AC1
M5 Spring Washer2
M5 Nut2
10 Way 5 mm Pitch Connector1
6 Way 5 mm Pitch Connector1
6 Way 3.5 mm Pitch Connector1
GSM Antenna1

Resistive Cable Module

COM-IT-RESCAB

10
Grey A1 0.75 mm2 signalling cable30 m
Green / Yellow 1.5 mm2 earthing cable6 m
Insulated 0.75 mm2 ferrule crimps18
Uninsulated 1.5 mm2 ferrule crimps3
Contents: SA380-IT-LV

Qty

SA380-IT Module - 12V DC1
M5 Spring Washer2
M5 Nut2
10 Way 5 mm Pitch Connector1
6 Way 5 mm Pitch Connector1
6 Way 3.5 mm Pitch Connector1
GSM Antenna1

Resistive Cable Module

COM-IT-RESCAB

10
Grey A1 0.75 mm2 signalling cable30 m
Green / Yellow 1.5 mm2 earthing cable6 m
Insulated 0.75 mm2 ferrule crimps18
Uninsulated 1.5 mm2 ferrule crimps3
Contents: SA380-IT-CN

Qty

10 Way 5 mm Pitch Connector1
6 Way 5 mm Pitch Connector1
6 Way 3.5 mm Pitch Connector1
Contents: SA380-IT-CK

Qty

Resistive Cable Module

COM-IT-RESCAB

10
Grey A1 0.75 mm2 signalling cable30 m
Green / Yellow 1.5 mm2 earthing cable6 m
Insulated 0.75 mm2 ferrule crimps18
Uninsulated 1.5 mm2 ferrule crimps3