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XR6/XR3 Installation Manual Control and monitoring
Page 9-6 Issue 3.0 2009-07-15
The backup battery should be replaced while ac power is ON. If the ac power faults, without adequate
backup battery power, then the log files will be lost.
CAUTION:
Do not wait for an extended period to replace the batteries. The control/monitor
PWB’s microcontroller may not retain its settings if ac power is turned off when
the backup battery voltage is too low.