ABB AC500 PLC Hardware Manual page 1296

System Assembly, Construction and Connection
AC500 (Standard) > Handling of Accessories
2.6.5.1.1 Insertion
Insertion
Fig. 244: Insertion of the Lithium battery
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To ensure propper operation and to prevent data loss, the battery insertion or
replacement must be always done with the system under power. Without battery
and power supply there is no data buffering possible.
Open the battery compartment with the small locking mechanism, press it down and slip
down the door. The door is attached to the front face of the processor module and cannot
be removed.
Remove the TA521 battery from its package and hold it by the small cable.
Insert the battery connector into the small connector port of the compartment. The con-
nector is keyed to find the correct polarity (red = plus-pole = above).
Insert first the cable and then the battery into the compartment, push it until it reaches the
bottom of the compartment.
Arrange the cable in order not to inhibit the door to close.
Pull-up the door and press until the locking mechanism snaps.
In order to prevent data losses or problems, the battery should be replaced after
3 years of utilisation or at least as soon as possible after receiving the "low bat-
tery warning" indication.
Do not use a battery older than 3 years for replacement, do not keep batteries
too long in stock.
3ADR010121, 13, en_US 2019/04/17