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P54A/B/C/E
2.2
REPLACING 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, you can replace either the
complete device or just the faulty PCB, identified by the in-built diagnostic software.
If possible you should replace the complete device, as this reduces the chance of damage due to electrostatic
discharge and also eliminates the risk of fitting an incompatible replacement PCB. However, we understand it may
be difficult to remove an installed product and you may be forced to replace the faulty PCB on-site. The case and
rear terminal blocks are designed to allow removal of the complete device, without disconnecting the scheme
wiring.
Caution:
Replacing PCBs requires the correct on-site environment (clean and dry) as well as
suitably trained personnel.
Caution:
If the repair is not performed by an approved service centre, the warranty will be
invalidated.
Caution:
Before carrying out any work on the equipment, 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. This should ensure that no
damage is caused by incorrect handling of the electronic components.
Warning:
Before working at the rear of the device, isolate all voltage and current supplying it.
Note:
The current transformer inputs are equipped with integral shorting switches which will close for safety reasons, when the
terminal block is removed.
To replace the complete device:
1.
Carefully disconnect the cables not connected to the terminal blocks (e.g. IRIG-B, fibre optic cables, earth),
as appropriate, from the rear of the device.
2.
Remove the terminal block screws using a magnetic screwdriver to minimise the risk of losing the screws or
leaving them in the terminal block.
3.
Without exerting excessive force or damaging the scheme wiring, pull the terminal blocks away from their
internal connectors.
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.
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.
P54xMED-TM-EN-1
Chapter 21 - Maintenance and Troubleshooting
491
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Table of Contents
Troubleshooting
