Disassemble and reassemble the IED accordingly:1. Switch off the dc supply.2. Short-circuit the current transformers and disconnect all current and voltageconnections 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 correspondingmetallic 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 proceduremust be performed again to maintain the total system accuracy.12.4 Repair support M11768-3 v3If an IED needs to be repaired, the whole IED must be removed and sent to anABB Logistic Center. Before returning the material, an inquiry must be sent to theABB Logistic Center.e-mail: offer.selog@se.abb.com12.5 Maintenance M11769-3 v2The IED is self-supervised. No special maintenance is required.Instructions from the power network company and other maintenance directivesvalid for maintenance of the power system must be followed.1MRK 506 383-UEN A Section 12TroubleshootingLine distance protection REL650 2.2 IEC 189Commissioning manual
