GE MiCOM P747 Agile, Technical Manual

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4. Remove the terminal block screws that fasten the device to the panel and rack. These are the screws
with the larger diameter heads that are accessible when the access covers are fitted and open.
If the top and bottom access covers have been removed, some more screws with
smaller diameter heads are made accessible. Do NOT remove these screws, as they
secure the front panel to the device.
5. Withdraw the device from the panel and rack. Take care, as the device will be heavy due to the
internal transformers.
6. To reinstall the device, follow the above instructions in reverse, ensuring that each terminal block is
relocated in the correct position and the chassis ground, IRIG-B and fibre optic connections are
replaced. The terminal blocks are labelled alphabetically with ‘A’ on the left hand side when viewed
from the rear.
Once the device has been reinstalled, it should be re-commissioned as set out in the Commissioning
chapter.
Note:
There are four possible types of terminal block: RTD/CLIO input, heavy duty, medium duty, and MiDOS. The terminal
blocks are fastened to the rear panel with slotted or cross-head screws depending on the type of terminal block. Not
all terminal block types are present on all products.
Figure 96: Possible terminal block types
2.3 REPAIRING THE DEVICE
If your product should develop a fault while in service, depending on the nature of the fault, the watchdog
contacts will change state and an alarm condition will be flagged. In the case of a fault, either the complete
unit or just the faulty PCB, identified by the in-built diagnostic software, should be replaced.
Replacement of printed circuit boards and other internal components must be undertaken by approved
Service Centres. Failure to obtain the authorization of after-sales engineers prior to commencing work may
invalidate the product warranty.
We recommend that you entrust any repairs to Automation Support teams, which are available world-wide.
Chapter 15 - Maintenance and Troubleshooting MiCOM P747
372 P747-TM-EN-1
P747-TM-EN-1.1