GE P4A, Техническое руководство, Страница: 521 / 850

5. Before fitting the replacement PCB check that the number on the round label next to the front edge of the
PCB matches the slot number into which it will be fitted. If the slot number is missing or incorrect, write the
correct slot number on the label.
6. Fit the replacement PCB carefully into the correct slot. Make sure it is pushed fully back and that the
securing screws are refitted.
7. Reconnect all connections at the rear.
8. Refit the front panel.
9. Refit and close the access covers then press the hinge assistance T-pieces so they click back into the front
panel moulding.
10. Once the unit has been reassembled, commission it according to the Commissioning chapter.
2.5.3 REPLACEMENT OF THE INPUT MODULE
Depending on the product, the input module consists of two or three boards fastened together and is contained
within a metal housing. One board contains the transformers and one contains the analogue to digital conversion
and processing electronics. Some devices have an additional auxiliary transformer contained on a third board.
To replace an input module:
1. Remove front panel.
2. The module is secured in the case by two screws on its right-hand side, accessible from the front, as shown
below. Move these screws carefully as they are not captive in the front plate of the module.
3. On the right-hand side of the module there is a small metal tab which brings out a handle (on some
modules there is also a tab on the left). Grasp the handle(s) and pull the module firmly forward, away from
the rear terminal blocks. A reasonable amount of force is needed due to the friction between the contacts of
the terminal blocks.
4. Remove the module from the case. The module may be heavy, because it contains the input voltage and
current transformers.
5. Slot in the replacement module and push it fully back onto the rear terminal blocks. To check that the
module is fully inserted, make sure the v-shaped cut-out in the bottom plate of the case is fully visible.
6. Refit the securing screws.
7. Refit the front panel.
8. Refit and close the access covers then press the hinge assistance T-pieces so they click back into the front
panel moulding.
9. Once the unit has been reassembled, commission it according to the Commissioning chapter.
Caution:
With non-mounted IEDs, the case needs to be held firmly while the module is
withdrawn. Withdraw the input module with care as it suddenly comes loose once the
friction of the terminal blocks is overcome.
Note:
If individual boards within the input module are replaced, recalibration will be necessary. We therefore recommend
replacement of the complete module to avoid on-site recalibration.
2.5.4 REPLACEMENT OF THE POWER SUPPLY BOARD
Caution:
Before removing the front panel, you should be familiar with the contents of the Safety
Information section of this guide or the Safety Guide SFTY/4LM, as well as the ratings
on the equipment’s rating label.
P54A/B/C/E Chapter 21 - Maintenance and Troubleshooting
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