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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.

Info

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 mm²Twisted 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 spanner	For securing fixing nuts
WERA 190 i VDE Insulated Nut-driver - 05005315001

Square Wire End Ferrule Crimper	For 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 Screwdriver	For removing wires from the SA380-IT spring-cage connectors
WERA 160 i VDE Screwdriver - 05006105001

Wire Stripper / Cutter	For preparing wires for termination
WEIDMULLER STRIPAX 16 ZERT

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

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

Laptop + Ethernet Cable	For 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 dependent	No Image

Drill + 12 mm Drill bit	Maybe required to route the antenna to the exterior of the installation point.
Type and requirement customer dependent	No Image

3.2) SA380-IT Layout

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Front Panel
No.	Name	Description
1	Power	Lit if the SA380-IT has main power
2	Network	Lit if the SA380-IT is connected to the GSM network
3	Server	Lit if the SA380-IT is connected to an Asset Management Server System
4	Test	Illuminates during self-test.
5	Run	Pulsates if the software is running.
6	HW Fault	Indicates a hardware or earth loop integrity problem
7	Earth Fault	Indicates the presence of an insulation fault
8	Bluetooth	Combined Indicator and touch-sensitive button. Touch to enable bluetooth functionality. Extinguished: Bluetooth disabled. Blinking: Awaiting pairing. Lit: Paired and active
9	Serial Number	Easy-read serial number of the device.
10	SIM Serial	Serial number of the built-in SIM
11	MFG Serial	Full serial number of the device.

Rear Panel
No.	Name	Description
1	Supply	Power supply to the SA380-IT
2	Functional Earth	Common Earth point for all device measurement
3	Loop Earth	Secondary Earth point for earth continuity measurement
4	Monitored Circuits	Connections for the IT circuits that require insulation monitoring
5	HiZ Outputs	A simple means of safely monitoring the insulation of the supply circuit.
6	Auxiliary Outputs	I/O to other devices and alarm circuits
7	GSM Antenna	Facilitates GSM connection to an Enterprise Asset Management System
8	Ethernet Jack	Allows local configuration and diagnostics, or Ethernet connection to an Enterprise Asset Management System
9	Fixing Stud	M5 mounting studs to fit BR930 / Q Style relay mountings. Brackets are available to allow alternate mounting arrangements
10	Quality Control	Device had undergone voltage withstand, calibration and inspection processes.
11	Supply Voltage	110 V AC or 12 V DC supply indication.

3.3) Typical Circuit

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Image Added

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

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

View file

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Typical Circuits v2.pdf

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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

Warning

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.

Info

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

Panel

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title	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.

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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 mm²Shrouded Ferrule crimps
Uninsulated Ferrule Crimps
0.75 mm² stranded single core cable
1.5 mm² stranded single core "earth" cable
Cable Markers	No Image
Tools
Square Wire End Ferrule Crimper
Wire Stripper / Cutter

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

Warning
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.

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Affix cable marker beads if required.

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

Select the correct crimp:

0.75 mm2 cable: WEIDMULLER H0,75/16 W SV INSULATED FERULE. P/N: 9025860000
1.5 mm2 cable: WEIDMULLER H1,5/10 UNINSULATED FERULE. P/N: 0186500000

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 mm²Shrouded Ferrule crimps
Cable Markers	No Image
"Live End" Circuit Termination Crimps	No Image
Main Fuse T2A Fuse	No Image
Tools
Square Wire End Ferrule Crimper
Wire Stripper / Cutter
Additional Crimping / Fixing Tool(s)	No Image

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Note

title	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!

Note

title	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.

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

Info
Do not use resistive cables

Supply Voltage Ranges:

Labelled Voltage	Min. V	Max. V
110 V AC	40 AC/DC	160 AC/DC
12 V DC	10 DC	16 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.

Info
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 Crimps	No Image
Tools
Square Wire End Ferrule Crimper
Wire Stripper / Cutter
Additional Crimping / Fixing Tool(s)	No Image

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

Warning

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.

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

Info
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.

Info

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 mm²Shrouded Ferrule crimps
0.75 mm² stranded single core cable
Cable markers	No Image
Resistive cable modules
"Live End" circuit termination crimps	No Image
Optional circuit fuses	No Image
Tools
Square Wire End Ferrule Crimper
Wire Stripper / Cutter
"Red" crimp tool
Additional Crimping / Fixing Tool(s)	No Image

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"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.

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

Note

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.

No	Notes
1	Existing Earth Fault has compromised negative leg isolation
2	B50 shorts to B120 at rear of SA380-IT.
3	B120 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
1	Through 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
2	Through 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
1	Short Circuit of the supply protected by mandatory provision of a supply circuit fuse.
2	Short Circuit of "HiZ" leads protected by internal 47 kΩ resistors

Warning

Please note the following important general wiring information:

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

No.	Safe?
1	No
Do not "common" circuits. N50(E) and N50(I) isolation compromised
2	No
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.

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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.

Tip
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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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.

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

Parts
GSM Antenna
Tools
Drill + 12 mm Drill bit	No Image

Panel

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

Info

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.

Tip
Please liaise with MPEC to specify your desired SIM package

3.11) Ethernet Connection

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Parts
Screened Ethernet Cable
Tools
None	No Image

Panel

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Info

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.

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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.

Tip

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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Panel

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title	Information

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

Info

title	Volt-Free-Contact

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

Info

title	Auxiliary Power

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

Info

title	RS485 Serial Data

RS485 functionality is not presently supported, but may be wired for future applications.

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 mm²Shrouded Ferrule crimps
Cable Markers	No Image
Circuit Termination Crimps	No Image
0.5 mm²Twisted Pair Cable
0.5 mm²Shrouded Ferrule Crimps
Tools
Square Wire End Ferrule Crimper
Wire Stripper / Cutter
Additional Crimping / Fixing Tool(s)	No Image

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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 vital for the correct results.

The devices must be wired as the image below to ensure earth faults are detected.

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.

RS485 functionality is not presently supported, but may be wired for future applications.

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.

...

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5.1) Front Panel Indications

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1	POWER
On	Off	Flash
Device has power	Device un-powered or faulty	Device Faulty
2	NETWORK
On	Off	Flash
Connected to GSM Network	Not connected to GSM network, or connected over Ethernet	Device Fault
3	SERVER
On	Off	Flash
Connected to EAM server	No connection to EAM server, or device in "fallback"	Device Fault
4	TEST
On	Off	Flash
Self-test underway	Self-test inactive	Device Fault
5	RUN
On	Off	Flash
Software crash - device fault	Software crash - device fault	Pulsates - Software running
6	HW FAULT
On	Off	Flash
Device hardware fault, monitored circuit voltage or earth loop irregularity	Device OK	Device fault
7	EARTH FAULT
On	Off	Flash
One or more monitored circuits has a reportable earth fault.	Monitored Circuits OK.	Device fault
8	BLUETOOTH
On	Off	Flash
Bluetooth active and paired to mobile device.	Bluetooth radio inactive	Bluetooth active and awaiting pairing

5.2) Connecting to the SA380-IT

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title	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.

Tip
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.

Info

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.

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title	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.

Tip
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:

Tip
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.

Info

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.

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title	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:

Tip
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:

1	IP address of the wireless GSM interface
2	IP 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.

Info

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

Expand

No.	Name	Description
1	Title	The Main Menu title is simply "SA380-IT Insulation Monitor"
2	Site	The name of the installation. Can be changed in "Settings"
3	Device ID	The unique ID of the device. Cannot be changed.
4	Measurement Data	Click here to access live measurement readings of monitored circuits.
5	Device Status	Click here to access live connectivity and device health information.
6	Utilities	Click here to access engineering functions such as device and communications reset, time update and firmware upgrade.
7	Settings	Click here to access all device settings.
8	About	Click here to view hardware and software build information.

5.4) Live Measurements

Expand

No.	Name	Description
1	Back	Return to main menu
2	Connection 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.
3	Time	The current time set on the device.
4	AC Monitored Circuit	AC monitored circuits show circuit voltage and equivalent resistance to earth (R_L).
5	Locked Monitored Circuit	This circuit is suffering from a lock-out condition hence no resistance to earth reading has been taken. Only voltage
6	DC Monitored Circuit	DC monitored circuits show circuit voltage and equivalent resistance to earth of each circuit leg (R_B and R_N).
7	Earth Loop Resistance	The resistance between FE and Loop Earth terminals.
8	Current Test	Displays the test currently being performed by the device at the moment the page refreshed.
9	Technicians Mode	Clicking on the white region of a monitored circuit or earth loop display will cause the device to enter technicians mode for that particular circuit.
10	Disclaimer	The 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.
11	Green 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.
12	Orange Text	..is used to denote monitored circuits suffering from a recoverable lock-out condition
13	Red 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
Info	Missing Circuits	Only 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

Expand

No.

Name

Description

1

Back

Navigates back to the live measurements screen and terminates technicians mode.

2

Circuit 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.

3

Dump

Displays a detailed diagnostic data dump (for manufacturers use).

4

Time

The current time.

5

Voltage

The monitored circuits present voltage. Not displayed if earth loop resistance has been selected.

6

Avg / Min / Max

Average, minimum and maximum voltage readings since technicians mode was entered or statistics reset.

7

Resistance

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

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

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

8

Avg / Min / Max

Average, minimum and maximum resistance readings since technicians mode was entered or statistics reset.

9

Reset Statistics

Reset all the average, minimum and maximum statistics for the page.

10

Technicians 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.

Note
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.

info

Green 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.

info

Orange Text

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

info

Red 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

Expand

No.

Name

Description

1

Back

Navigates back to the main menu

2

Connection 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.

3

Time

The current time.

4

Device Status

Shows if the device is presently paused or in technicians mode

5

Hardware Fault

Will be present if the HW FAULT indication is lit. See device syslog for detailed diagnostics.

6

Earth Fault

Will be present if the EARTH FAULT indication is lit. See live measurements for detailed diagnostics.

7

Server Connection

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

Protocol

RDAQ	Mpec RailDAQ protocol in use
MIMOSA	Network Rail MIMOSA protocol in use
FTP	Network Rail firmware update in progress

Bearer

GSM	The connection is using the GSM modem
Ethernet	The connection is using the LAN port

Connection Status

Black	Server 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.
Green	The SA380-IT is connected to the server side system and data is being successfully transmitted.

8

Wireless 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:

Bars	Meaning
1	Poor - Requires improvement
2	OK - May struggle at times
3	Good - No action required
4	Excellent - No action required

9

Wireless 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.

10

Ethernet 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.

11

Queued Events

How many data events are awaiting transmission to the server.

12

Temperature

Internal temperature of the SA380-IT.

13

Run Time

How long the SA380-IT has continuously operating since last reboot.

5.7) Utilities

Expand

No.

Name

Description

1

Back

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.

Note
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.

3

Reset Safety Interlocks

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

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

4

System Log

Opens the System log page to retrieve detailed diagnostic data.

5

Restart 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.

6

Clear Queue

This will erase all pending messages waiting to be sent to the server. The data will be permanently lost.

7

Set Time From Browser

The 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.

8

Reboot

Performs a software restart of the device.

9

Firmware Update

Opens the Firmware update screen.

5.8) Syslog

Expand

Panel

borderColor	LightGrey
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title	User Interface

No.	Name	Description
1	Back	Navigates back to the main menu.
2	Start Date / Time	The time and date from which you wish to interrogate the system logs. The default setting on one hour in past.
3	End Date / Time	The time and date at which you wish to finish interrogating the system logs. The default setting on 24 hours hence.
4	System Log Filter	Filters the System Log to show either "Analogue Data" (Measurements) or "Syslog" (event log) events.
5	Search	Click ./ Tap to begin search. Be aware this can take some time, especially on slow 2G GSM connections.

No.	Name	Description
1	Back	Navigates back to the System Log menu
2	Date / Time stamp	The time and date of the system log entry
3	Channel	The channel to which this measurement belongs.
4	Value	The value of the measurement.

No.	Name	Description
1	Back	Navigates back to the System Log menu
2	Date / Time stamp	The time and date of the system log entry
3	Entry Type	The type of System Log entry (See table below)
4	Additional Info	Many syslog entries contain additional informative text that describe system behaviour. (See table below)

Panel

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title	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 Entry	Description
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 connected	Confirmed as connected to a Centrix server.
Centrix disconnected	Confirmed as disconnected from a Centrix server.
Config changed by remote user	Configuration changed via Bluetooth, or via web-pages.
Config changed by MIMOSA	Configuration changed by the Network Rail II server.
Interlocks cleared	User issued "reset interlocks" command
Logger active	SA380-IT has booted and is now running.
Mimosa client ended	Device will now send MIMOSA messages
Mimosa server ended	Device no longer listening for MIMOSA messages
FTP handler	Device is attempting firmware upgrade
FTP download error	An error has occurred during FTP firmware upgrade
M My IP	Records the IP address used by the device
M My IP changed!	Records changes to the IP address
M Rx HTTP error	Logs HTTP error response codes from the server.
M Rx No response from core sys	The Network Rail II system is unreachable due to lack of connectivity or the server is not running.
M Rx HTTP 200 - OK	The last message sent to the server was accepted.
M Tx aborted	Message transmission aborted due to timeout - unable to connect to the server, or transmission took too long.
M Tx Fallback for	There will be a fallback "delay" before attempting to send another message.
Queue Information	Invalid queue update attempted (RailDAQ mode).
Modem command	Displayed the last command sent to the device modem.
Modem command failed	The modem failed to respond to the last modem command.
Modem power off	The modem has been turned off.
Modem power on	The modem has been turned on.
Restarting system	The SA380-IT is about to restart
Sending SNTP request	The device is attempting a time-sync.
SNTP response	The device has received a time-sync update.
SNTP timeout	The time-sync attempt has failed
SNTP set time	The device has updated its time.
Thread watchdog event	Software error.

5.9) Firmware Update

Expand

Panel

borderColor	LightGrey
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title	Download & Select Firmware

No.	Name	Description
1	Back	Navigates back to the Utilities menu.
2	Current Version	Displays the Firmware Version currently installed.
3	Get 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.
4	Select 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)

Panel

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title	Upgrade SA380-IT Firmware

No.

Name

Description

1

Filename

Displays the filename of the selected firmware package

2

Package Version

Displays the official firmware version of the selected package.

3

Upload Firmware

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

4

Progress Bar

Displays the current progress of the firmware upload process.

Info
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.

Tip
You may need to reconnect after reboot if using bluetooth.

5.10) Settings

Expand

No.

Name

Description

1

Back

Navigates back to the main menu

2

Device 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.

3

Circuit Settings

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

4

Autodetect Circuits

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

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

5

Earth Loop Name

You 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.

6

Advanced

Provides access to Advanced Settings that do not typically need to be altered in the vast number of installations.

5.11) Circuit Settings

Expand

No.

Name

Description

1

Back

Navigates back to the Settings menu

2

Name

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.

3

Voltage

The nominal voltage of the monitored circuit.

Warning

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:

4

AC/DC

Select if the monitored circuit is AC or DC.

Warning

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

Expand

No.

Name

Description

1

Back

Navigates back to the Settings menu

2

Detected Voltage

Green text denotes that a valid voltage has been detected on this input channel and that a circuit has been configured for measurement.

3

Measured Voltage

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

4

Nominal Voltage

Shows the nominal voltage auto-configured for this circuit.

Tip

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

BX110
B120
B50
B24
B12

Warning

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:

5

Reverse Voltage

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

6

Unused Circuit

Input channels with no voltage present will not be configured for measurement when using Autodetect.

5.13 Advanced Settings

Expand

No.

Name

Description

1

Back

Navigates back to the Settings menu

2

Device ID

Set to the device serial number.

This is for information only. It cannot be changed.

3

Manufacturer 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.

4

Server Name

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

Tip

Common Server Names:

Mpec Centrix

centrix.org

Network Rail II/RADAR

iihome.hiav.networkrail.co.uk

Tip

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.

5

Server 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.

6

Server Connection Type

How to attempt data connection to the server system:

Any	Attempt connection on both GSM and Ethernet interfaces. Robust but can extend reconnection times.
GSM	Exclusive use of the GSM radio.
Ethernet	Exclusive use of the Ethernet port

7

SNTP 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.

Tip

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.

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

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

8

APN

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.

Tip

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.

Tip

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.

9

APN 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.

10

APN 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.

11

Ethernet IP Address

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

Tip

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.

Tip

The default IP address of the device upon shipment is:

192.168.100.115

12

Ethernet Net Mask

Ethernet Subnet Mask:

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

Tip

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.

Tip

The default subnet mask of the device upon shipment is:

255.255.255.0

13

Ethernet Default Route

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

Tip

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.

Tip

The default route of the device upon shipment is:

192.168.100.1

14

Primary DNS Server

Primary Domain Name Server.

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

Tip

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.

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

15

Secondary DNS Server

Secondary Domain Name Server.

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

Tip

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.

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

16

Operating Mode

Standalone

Act 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.

17

AC Settings

Opens a menu that governs advanced setting regarding AC circuit data acquisition.

18

DC Settings

Opens a menu that governs advanced setting regarding DC circuit data acquisition.

19

Earth Loop Settings

Opens a menu that governs advanced setting regarding Earth Loop data acquisition.

20

Voltage 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.

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

21

Global 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.

22

Relay 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.

23

Unstable 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.

24

Alarm 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

Delayed

Restarts if the fault condition has been proven to be continously clear for the device reporting period

Manual

Measurement 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

25

Fast Scan (Sec. per Circuit)

This setting is obsolete and scheduled for removal.

The setting does not govern anything.

26

Medium 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.

27

Slow 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.

28

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

29

Self-Test Interval (secs.)

The number of seconds between self-test cycles.

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

Increased frequency has a marginal impact on device responsiveness.

30

Calibration 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.

31

MIMOSA Buffer Size

Network Rail MIMOSA mode only

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

Tip
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.

Tip
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.

32

MIMOSA Buffer Timeout (secs.)

Network Rail MIMOSA mode only

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

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

33

Append 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.

Unappended	BX110	There will be many channels named BX110
Appended	10345:BX110	This BX110 channel belongs to device no. 10345

34

FTP 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.

Tip

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

No FTP upgrade attempt will be made in RailDAQ mode.

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

35

FTP Username

Network Rail MIMOSA mode only

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

36

FTP Password

Network Rail MIMOSA mode only

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

37

FTP 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

Expand

No.

Name

Description

1

Back

Navigates back to the Advanced Settings menu

2

Clear 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.

3

Notify Threshold

Tip

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.

4

Reportable Threshold

Tip

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.

5

Minimum 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.

6

Saftey 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.

7

DC 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

Expand

No.

Name

Description

1

Back

Navigates back to the Advanced Settings menu

2

Clear 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.

3

Notify Threshold

Tip

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.

4

Reportable Threshold

Tip

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.

5

Minimum 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.

6

Saftey 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

Expand

No.

Name

Description

1

Back

Navigates back to the Advanced Settings menu

2

Earth Loop Acquire on Change

This setting is deprecated and will shortly be removed.

The settings has no effect.

3

Earth 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.

Tip

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.

4

Measurement Frequency

Governs how often earth-loop resistance measurements are performed.

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

Increased frequency has a marginal impact on device responsiveness.

5

Earth 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.

Tip

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

Expand

No.	Name	Description
1	Back	Navigates back to the Main menu
2	Name & Decription	Lists the product name for information only
3	Version	Lists the current firmware version for information only
4	Build Date	Lists the firmware build date for information only
5	User Guide	A handy link to this documentation.

...

Expand

9.1) Specification Data

Expand

Insulation Coordination to EN50124-1 & EN60101-1
Nominal System Supply Voltage (U_N) (110 V AC Variant)	AC 110 V RMS
Nominal System Supply Voltage (U_N) (12 V DC Variant)	DC 12 V
Over-voltage Category	CAT IV
Rated Impulse Voltage Withstand (U_Ni)	4 kV
Pollution Degree	3
Rated Insulation Voltage (U_Nm)	AC 185V RMS
Inter-Monitored Circuit Isolation Voltage (Galvanic)	+/- 400 V Peak	Min.
Inter-Monitored Circuit Protective Impedance (in break-down)	140 kΩ	Min.
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 Consumption	6 VA

Monitored Circuits Voltage
Number of Independent Circuits Monitored	5	AC or DC
Operating Voltage Range	AC 5-160 V RMS DC 5-160 V RMS	+15% +15%
Operating Frequency Range	DC to 60 Hz
Voltage Accuracy	+/- 5 %	>= 1 V

Monitored Circuits Insulation Resistance
Equivalent Resistance to Earth (R_{L =}R_B//R_N)	0 Ω to 5 MΩ	AC Circuits
Actual Resistance to Earth (R_B and R_N)	0 Ω to 5 MΩ	DC Circuits
Accuracy*	+/- 1 kΩ	Z_L< 20 kΩ
Accuracy*	+/- 5 %	Z_L>= 20 kΩ Z_L<= 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) T_R	1.5 s	Typical
Maximum Response Time (per circuit) T_R	750,000 x C_E	seconds
Product Response Time	T_RX Number of Circuits in Operation	Typical
System Leakage Capacitance (C_E) (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 kΩ	no resistive cable fitted
System Resistance & Impedance	> 70 kΩ	resistive cable fitted
Measuring Circuit is only connected to a single Monitored Circuit at any one time
Internal System Check Frequency	300 s

Earth Loop Circuit
Measuring Voltage	+/- 3.5 V	Max.
Measuring Current	< 1 mA
System Resistance & Impedance	> 25 kΩ	FE to SE
Tolerance to Stray Interference Voltage	+/- 1,100 mV DC.
Tolerance to Stray Interference Voltage	+/- 850 mV AC.	Peak,
Measurement Range	0 Ω to 1.1 kΩ
Accuracy	+/- 0.5 Ω	R_E< 10 Ω
	+/- 5 %	R_E>= 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 %
Auxiliary Power Output	Power	1 W +/- 10 %
Volt-Free Contact	Form	N.O. SPST
	Withstand Voltage	+/- 160 V Max.
	Contact On Resistance	0.75 Ω Max.
	Contact Off Resistance	1 MΩ Min.
	Max. Current	1 A AC RMS or DC
Serial Data Output	EIA RS485	115,200 bps Max.
Ethernet	RJ45	10/100 Mbps Auto MDIX
Wireless Modem (SIM Factory Fitted)	SMA (Female)	GSM 2G GPRS
Bluetooth	Touch to Enable	Bluetooth 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 Class	EN50125-3	T1 In cubicle
Ambient Operating Temperature	-25 °C to +70 °C
Storage Temperature	-40 °C to +85 °C
Humidity	5 % to 100 %	Condensing
Vibration	2.3 m/s²	3 - axis'
Impact Protection	IK06
Ingress Protection	IP52
Flammability Rating	UL94 V0

Installation Data
Mounting	BR930 / Q Style Mounting Plate
Primary Connections	Wire Size: 2.5 mm²max.	Spring Clamp
Auxiliary Connections	Wire Size: 1.5 mm²max.	Spring Clamp
Weight	350g

9.2) Ordering Details

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-NR	0086/000416
SA380-IT Multiple Bus-Bar Insulation Monitor Device. 110 V AC Power Supply With cables and crimps	SA380-IT-SD	0086/000417
SA380-IT Multiple Bus-Bar Insulation Monitor Device. 12 V DC Power Supply With cables and crimps	SA380-IT-LV	NA
Cable & Crimp kit	SA380-IT-CK	0086/000418
SA380-IT Spare Connector Set	SA380-IT-CN	0086/000419
SA380-IT 47KΩ Resistive Cable - 3 meters	COM-IT-RESCAB	NA
SA380-IT Hand-held Configuration and Diagnostics Device	SA380-IT-CD	0086/000422
SA380 Series Hinged Wall Bracket	BRK-HINGE	0086/000423

Contents: SA380-IT-NR	Qty
SA380-IT Module - 110 V AC	1
M5 Spring Washer	2
M5 Nut	2
10 Way 5 mm Pitch Connector	1
6 Way 5 mm Pitch Connector	1
6 Way 3.5 mm Pitch Connector	1
GSM Antenna	1

Contents: SA380-IT-SD	Qty
SA380-IT Module - 110 V AC	1
M5 Spring Washer	2
M5 Nut	2
10 Way 5 mm Pitch Connector	1
6 Way 5 mm Pitch Connector	1
6 Way 3.5 mm Pitch Connector	1
GSM Antenna	1
Resistive Cable Module COM-IT-RESCAB	10
Grey A1 0.75 mm² signalling cable	30 m
Green / Yellow 1.5 mm² earthing cable	6 m
Insulated 0.75 mm² ferrule crimps	18
Uninsulated 1.5 mm² ferrule crimps	3

Contents: SA380-IT-LV	Qty
SA380-IT Module - 12V DC	1
M5 Spring Washer	2
M5 Nut	2
10 Way 5 mm Pitch Connector	1
6 Way 5 mm Pitch Connector	1
6 Way 3.5 mm Pitch Connector	1
GSM Antenna	1
Resistive Cable Module COM-IT-RESCAB	10
Grey A1 0.75 mm² signalling cable	30 m
Green / Yellow 1.5 mm² earthing cable	6 m
Insulated 0.75 mm² ferrule crimps	18
Uninsulated 1.5 mm² ferrule crimps	3

Contents: SA380-IT-CN	Qty
10 Way 5 mm Pitch Connector	1
6 Way 5 mm Pitch Connector	1
6 Way 3.5 mm Pitch Connector	1

Contents: SA380-IT-CK	Qty
Resistive Cable Module COM-IT-RESCAB	10
Grey A1 0.75 mm² signalling cable	30 m
Green / Yellow 1.5 mm² earthing cable	6 m
Insulated 0.75 mm² ferrule crimps	18
Uninsulated 1.5 mm² ferrule crimps	3

...

Versions Compared

Old Version 460

New Version Current

Key

3.1) Parts and Tools Required

3.2) SA380-IT Layout

3.3) Typical Circuit

3.4) Pre-Installation

3.5) Fitting

3.6) Termination of SA380-IT Wiring

3.7) Wiring the Power Supply

3.8) Wiring the Earth Loop

3.9) Wiring of Input Circuits

3.10) GSM Connection

3.11) Ethernet Connection

3.12) Wiring of Auxiliary Inputs

5.1) Front Panel Indications

5.2) Connecting to the SA380-IT

5.3) Main Menu

5.4) Live Measurements

5.5) Technicians Mode

5.6) Device Status

5.7) Utilities

5.8) Syslog

5.9) Firmware Update

5.10) Settings

5.11) Circuit Settings

5.12) Auto-Detect Circuits

5.13 Advanced Settings

5.14) AC Settings

5.15) DC Settings

5.16) Earth Loop Settings

5.17) About

9.1) Specification Data

9.2) Ordering Details