8.4 Replacing the Battery
Unified Controller nv series type2 light Controller Unit Instruction Manual
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8.4 Replacing the Battery
With the battery in battery pack HBTM12*AS, the controller module retains the register
contents and calendar data that are specified to be stored at electric outage time. The
battery used is a lithium battery that is small in self-discharge and wide in the range of
operating temperature. This ensures stable operation with a safe conscience even if the
period of unpowered storage is long.
The battery installation date is labeled on the controller module's battery cover.
In an ordinary environment of use, it is recommended that the battery be replaced every
5 years when the annual average temperature is 30
C
or less, or every 2 years when the
annual average temperature is 30
C
or more. Check the battery installation date, and
replace the battery according to the procedure below.
The BAT LED, indicating normality of the battery voltage, is located on the controller
module's front panel. It remains lit when being normal. When the LED blinks or goes out,
this indicates that the battery is almost at the end of its lifetime. Replace it within seven
days after this. (For the purpose of program protection, it is recommended that the
power not be turned off until replacement.)
■
Battery replacement procedure
Complete the battery replacement process within 3 min.
Open the front battery cover and take out the battery from battery holder.
Pull out the connector (brown) for the battery module frontwards.
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