7. Ensure that the battery is held securely in its socket and that the battery terminals make good
contact with the socket terminals.
8. Replace the front bazel and relay cover.
9. After replacing the lithium coin battery, you must reconfigure and reset the system date and time.
2.3 Replacing the Unit
If your product develops a fault while in service, depending on the nature of the fault, error codes will
be generated which can be viewed on the relay HMI. The first step is to take the actions suggested in
the Troubleshooting chapter of this manual. If the problem persists or lies with the wiring and/or
terminals, then you must replace the complete device, rewire and re-commission the device.
Once the unit has been reinstalled, it should be re-commissioned.
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 Pxxx-
SG-4LM-2 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 unit, isolate all voltage and current supplying
it.
Note: The P253 does not support automatic current transformer shorting. Therefore, for safety reasons CT
terminals to be shorted when the terminal block is removed.
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