12 Maintenance and Troubleshooting
The data maintained includes event, fault and disturbance records and the thermal state at the time of
failure. The battery periodically needs changing if there is a low battery condition, to ensure reliability.
The lithium coin battery is located on the CPU PCB.
Caution: Before carrying out any work on the equipment you should be familiar with the
contents of the Safety Section or the Safety Guide Pxxx-SG-4LM-3 and the
ratings on the equipment’s rating label.
2.2.1 Replacing the Lithium Coin Battery
1. Remove the relay cover by loosening the screws as shown in figure below.
Figure 1: Removal of relay cover
2. Remove the Front bezel by loosening the screws as shown in figure below.
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