2.2 REPLACING THE UNIT
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 should normally
replace the cradle which slides easily out of the case. This can be done without disturbing the scheme wiring.
In the unlikely event that the problem lies with the wiring and/or terminals, then you must replace the complete
device, rewire and re-commission the device.
Caution:
If the r
epair is not performed by an approved service centre, the warranty will be
invalidated.
Caution:
Befor
e 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:
Befor
e working at the rear of the unit, isolate all voltage and current supplying it.
Note:
The General Electric pr
oducts have integral current transformer shorting switches which will close, for safety reasons, when
the terminal block is removed.
To replace the cradle without disturbing the case and wiring:
1.
Remove the faceplate.
2. Carefully withdraw the cradle from the front.
3. To reinstall the unit, follow the above instructions in reverse, ensuring that each terminal block is relocated
in the correct position and all connections are replaced. The terminal blocks are labelled alphabetically with
‘A’ on the left hand side when viewed from the rear.
Once the unit has been reinstalled, it should be re-commissioned as set out in the Commissioning chapter.
2.3 CLEANING
Warning:
Befor
e cleaning the device, ensure that all AC and DC supplies and transformer
connections are isolated, to prevent any chance of an electric shock while cleaning.
Only clean the equipment with a lint-free cloth dampened with clean water. Do not use detergents, solvents or
abrasiv
e cleaners as they may damage the product's surfaces and leave a conductive residue.
P24xM Chapter 20 - Maintenance and Troubleshooting
P24xM-TM-EN-2.1 423
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