1. Switch off the dc supply.
2. Short-circuit the current transformers and disconnect all current and voltage
connections from the IED.
3. Disconnect all signal wires by removing the female connectors.
4. Disconnect the optical fibers.
5. Unscrew the main back plate of the IED.
6. If the transformer module is to be changed:
• Remove the IED from the panel if necessary.
• Remove the rear plate of the IED.
• Remove the front plate.
• Remove the screws of the transformer input module, both front and rear.
7. Pull out the faulty module.
8. Check that the new module has a correct identity number.
9. Check that the springs on the card rail are connected to the corresponding
metallic area on the circuit board when the new module is inserted.
10. Reassemble the IED.
If the IED has been calibrated with the system inputs, the calibration procedure
must be performed again to maintain the total system accuracy.
16.3 Repair support
If an IED needs to be repaired, the whole IED must be removed and sent to an
ABB Logistic Center. Before returning the material, an inquiry must be sent to the
ABB Logistic Center.
e-mail: offer.selog@se.abb.com
16.4 Maintenance
The IED is self-supervised. No special maintenance is required.
Instructions from the power network company and other maintenance directives
valid for maintenance of the power system must be followed.
1MRK 504 088-UEN C Section 16
Fault tracing and repair
223
Installation and commissioning manual
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