Replacement Of The Power Supply Board; Typical Power Supply Board - GE MiCOM P40 Agile Technical Manual

Maintenance
MiCOM P40 Agile P442, P444
The replacement module can be slotted in using the reverse procedure, ensuring that it is
pushed fully back on to the rear terminal blocks and the securing screws are re-fitted.
Note:
Refit the front panel using the reverse procedure to that given in section 1.3.2. After refitting
and closing the access covers on case sizes 60TE, press on the location of the hinge-
assistance T-pieces so that they click back into the front panel moulding.
Once the relay has been reassembled after repair, it should be recommissioned in
accordance with the instructions in sections 1 to 7 (inclusive) of this document.
1.3.2.4

Replacement of the power supply board

The power supply board is fastened to a relay board to form the power supply module and is
located on the extreme left-hand side of all MiCOM distance relays.
Pull the power supply module forward, away from the rear terminal blocks and out of the
case. A reasonable amount of force will be required to achieve this due to the friction
between the contacts of the two medium duty terminal blocks.
The two boards are held together with push-fit nylon pillars and can be separated by pulling
them apart. Care should be taken when separating the boards to avoid damaging the inter-
board connectors located near the lower edge of the PCBs towards the front of the power
supply module.
The power supply board is the one with two large electrolytic capacitors on it that protrude
through the other board that forms the power supply module. To help identify that the
correct board has been removed, Figure 7 shows the layout of the power supply board for all
voltage ratings.
Figure 7 - Typical Power Supply Board
Re-assemble the module with a replacement board ensuring the inter-board connectors are
firmly pushed together and the four push-fit nylon pillars are securely located in their
respective holes in each PCB.
Slot the power supply module back into the relay case, ensuring that it is pushed fully back
on to the rear terminal blocks.
Refit the front panel using the reverse procedure to that given in section 1.3.2. After refitting
and closing the access covers on case sizes 60TE, press on the location of the hinge-
assistance T-pieces so that they click back into the front panel moulding.
The transformer and input boards within the module are calibrated together with the
calibration data being stored on the input board. Therefore it is recommended that
the complete module is replaced to avoid having to perform an on-site recalibration.
P44x/EN MT/Hb6
(MT) 10-13