User Manual

SmartRelay: SREL, SREL.ZK, SREL.ADV
Page 21
9.2 Backup Battery
A discharged backup battery can cause the internal clock in the type SREL.ZK or
SREL.ADV SmartRelay to stop. For this reason, we recommend that you check the
time of day at routine intervals. A backup battery will last approximately 10 years if
there is no power supply interruption. If the SmartRelay needs the backup battery
often because of frequent power failures, you should replace this battery routinely.
If you operate the SmartRelay with a battery (SREL.BAT), you are not
permitted to
use the backup battery.