Liebert UPS System - Manual (Page 118)

Chapter 10 Service after Sales
112
Chapter 10 Service after Sales
10.1 Abnormal Fault Handling
If the UPS is abnormal without alarm indication, check according to Table 10-1.
Table 10-1 Fault handling
No.1 Fault description Reason Actions to be taken
1
Utility switch is put to
“ON”, no display by LCD,
no self test of system
A. Input power is
disconnected from system
B. Input under voltage
Check the input voltage
2
UPS has no output power
and no alarm Output power cables are not
well connected
Check the output cables
3 Abnormal sound and smell UPS has internal fault Contact the distributor
When the UPS is abnormal with visual/audible alarm, check the LCD display first
and then process the fault according to Table10-2.