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.
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No part of this publication may be copied without the prior consent of Mpec.
Contents
1) Product Overview
2) Safety Information
2.1) Explanation of Symbols
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
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
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
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
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
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:
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
3.1) Parts and Tools Required
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
Tools
3.2) SA380-IT Layout
3.3) Typical Circuit
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
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
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
4) Commissioning
4.1) Energise Device
4.2) Connect to Device
4.3) Check for Latest Firmware
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.
4.4) Check Earth Loop Reading
4.5) Configure Monitored Circuits
4.6) Check for Server Connection
4.7) Troubleshooting
If troubleshooting steps require a configuration change, refer to section 5 for detailed descriptions on the behaviour of all configuration items.
5) Detailed Operation
5.1) Front Panel Indications
5.2) Connecting to the SA380-IT
5.3) Main Menu
5.4) Live Measurements
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
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
6) Faulting and Maintenance
7) Principals of Operation
8) Data Acquisition
9) Technical Data
9.1) Specification Data
*See section ? for an explanation of measurement accuracy with regard to the insulation resistance of DC monitored circuits.
9.2) Ordering Details