Liebert UPS System - Manual (Page 83)

Chapter 6 Maintenance
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5）Check whether all the fans operate normally. The life of the fan in continuous
operating state is 20000—40000 hours and will be shortened if the fan operates in
high temperature environment.
2. Weekly checking
1）Measure and record the battery charging voltage;
2）Measure and record the battery charging current;
3）Measure and record the UPS three-phase output voltage;
4）Measure and record the output current of each output phase of UPS; If the
current differs greatly with previous values, record the load capacity, types and
location for later analysis.
Please contact us if the displayed value differs with the calculated value.
3. Annual checking
Note:
The annual checking must be done by qualified person because the person may be
required to test the high voltage components inside the UPS.
During annual checking, the load should be powered by maintenance bypass.
Each year, the UPS should be cleaned and the following items should be checked:
1）At first, check the weekly checking items;
2）Switch off the UPS and let the maintenance bypass to power the load;
3）Switch off the input switch and battery switch;
4）Make sure that the input terminals of the UPS(R1, S1 and T1), battery terminals,
output terminals(U4, V4 and W4) and bypass input terminals (R4, S4 and T4) are
not energized;
5）Open the UPS door and internal protection door
6）Check the UPS power components and auxiliary components, pay attention to
the following parts:
Capacitor: check whether there is any leakage and deform phenomenon;
Magnetic component: Check whether there is any over-temperature marks and
cracks, and the secure degree