Liebert UPS System User Manual page 85

Chapter 6 Maintenance
3）Keep the ambient temperature between 15℃ and 25℃.
4 ） To prevent small current discharge, continuous battery discharge time
exceeding 24 hours is prohibited.
5）Please contact the distributor if the battery backup time is greatly shortened, or
the UPS LCD displays "battery needs to be replaced". Confirm whether the battery
needs to be replaced. Please confirm whether the parameters of the replaced
battery and new battery are same.
6）Check whether the auto battery management function is normal because many
battery maintenance work is done automatically through the battery management
functions, for example, charging the battery periodically, temperature compensation,
EC/FC switchover, battery low alarm and battery life forecast.
2. Manual battery self-test
The conditions for self test:
1）Battery contactor closes
2）Battery is in float charging state;
3）Rectifier and inverter communicate normally;
4）Battery status is normal;
5）Rectifier operates normally;
6）Utility source voltage is normal;
7）Inverter operates normally
8）Load capacity is larger than the battery capacity set by battery curves;
9）UPS is not in united operation (generator + battery) mode
The battery self test will be conducted only all of the above conditions are satisfied.
During the self test, if any one of the above condition is not satisfied, the system will
exit the self test state and enter equalization charging state.
Pressing the "stop manual self test" can stop the self test process and the battery
transfers to equalization state.
Battery will transfer to equalization state after self test is over.
3. Auto battery self test
Auto self-test is start if the UPS operation states satisfies the manual self-test
condition and the last self-test interval satisfy the "battery discharging interval". The
79