ABB Relion 670 Series Commissioning Manual page 274

Section 14
Troubleshooting
An alternative is to open the IED and send only the faulty circuit board to ABB for repair. When a
printed circuit board is sent to ABB, it must always be placed in a metallic, ESD-proof, protection
bag. The user can also purchase separate replacement modules.
Most electronic components are sensitive to electrostatic discharge and latent damage may
occur. Please observe usual procedures for handling electronics and also use an ESD wrist strap. A
semi-conducting layer must be placed on the workbench and connected to ground.
Disassemble and reassemble the IED accordingly:
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:
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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.
14.4 Repair support
If an IED needs to be repaired, the whole IED must be removed and sent to an ABB Logistic Center.
Please contact the local ABB representative to get more details.
14.5 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.
268
Strictly follow the company and country safety regulations.
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.
© Copyright 2017 ABB. All rights reserved
1MRK 506 371-UUS E
M11764-10 v1
M11766-4 v3
M11768-3 v3
M11769-3 v2
Line distance protection REL670
Commissioning manual