NT200 Power Supply Module
4–5
1070 072 145-102 (01.07) GB
4.3 Memory Backup Battery
The memory backup battery assists the central backup of remanent areas
for markers, timers, counters, data field and PLC program. The backup bat-
tery powers the internal RAM onboard the central processing unit in the
event of a failure of the 24 V power supply, and upon switching off the NT200
power supply module.
Module
typ. current draw in mA at
25 _C 55 _C
NT200 18 28
Central processing module 6 28
The service life of the memory backup battery depends on:
D Ambient temperature
D Time interval for which the controller is switched off
. Replace the memory backup battery after 1!/$ years at the latest.
The CL200 uses lithium backup batteries. They contain less than 0.5 g of
lithium, and are hermetically sealed. They are not considered a hazardous
substance when transported in their original package.
Backup batteries:
D Store in a cool, dry place, at max. 35 _C recommended storage temp.
D Do not short-circuit
D Do not recharge
D Do not deep-discharge
D Do not incinerate
D Do not connect with reverse polarity
D Do not damage or open cells
Low Battery warning
The backup battery is tested on the following occasions:
D Subsequent to powering up the 24 V power supply
D When pressing the Battery Reset button on the front panel of the power
supply module
A missing battery or the detection of low battery voltage causes the S30.7
Low Battery signal in the system area to go HIGH.
The same occurs when the battery voltage drops below 2.6 V while the con-
troller is switched on.
Battery failure
A battery failure is detected subsequent to Power-On in the following cases:
D The backup battery is missing.
D Central processing unit or NT200 power supply module has been remo-
ved prior to Power-On.
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