ABB AC500 PLC Hardware Manual page 1297

2.6.5.1.2 Replacement
Replacement of
the Battery
1.
2.
3.
2.6.5.2 TA541 - Lithium Battery
● Manganese dioxide lithium battery, 3 V
● Non-rechargeable
2019/04/17
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 old TA521 battery from the battery compartment by pulling it by the small
cable. Remove then the small connector from the socket, do this best by lifting it out with a
screwdriver.
Follow the previous instructions to insert a new battery.
CAUTION!
Risk of explosion!
Do not open, re-charge or disassemble a lithium battery. Attempts to charge
lithium batteries lead to overheating and possible explosions.
Prevent them from heat and fire and store them in a dry place.
Never short-circuit or operate lithium batteries with the polarities reversed. The
batteries are likely to overheat and explode. Avoid chance short circuiting and
therefore do not store batteries in metal containers and do not place them on
metallic surfaces. Escaping lithium is a health hazard.
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
System Assembly, Construction and Connection
AC500 (Standard) > Handling of Accessories
1297