Liebert UPS System - Manual (Page 119)

Chapter 10 Service after Sales
113
Table 10-2 Fault information of Single module UPS system
No.1 Fault description Reason Actions to be taken
1 Ambient over-temperature over-temperature of UPS room Check the ventilation
2
Environment parameter 1
abnormal Environment parameter channel 1
has alarm Check the devices relating to the
channel
3
Environment parameter 2
abnormal Environment parameter channel 2
has alarm Check the devices relating to the
channel
4
Environment parameter 3
abnormal Environment parameter channel 3
has alarm Check the devices relating to the
channel
5
Environment parameter
abnormal 12V environment parameter
channel has alarm Check the devices relating to the
channel
6
Rectifier input voltage
abnormal Line-to-neutral voltage of rectifier
exceeds normal operation range Check the input line-to-neutral voltage
amplitude of rectifier
7
Rectifier input under-
voltage
Line-to-neutral voltage of rectifier
lower than 305V, but higher than
208V Check the input line-to-neutral voltage
amplitude of rectifier
8
Rectifier’s input voltage
frequency is abnormal Rectifier frequency exceeds the
normal range Check the rectifier’s input voltage
frequency
9 Input fuse blows Rectifier input fuse blows up Notify the service dept for repairing
10
Input transformer over
temperature Temperature of input transformer
is too high Check the ambient temperature and
ventilation
11
Input phase rotation
Reverse Rectifier’s input phase rotation is
reverse Notify the UPS service engineer, check
the wiring of rectifier input cables
12 Bypass unsynchronized
Bypass voltage or frequency is
out of normal range and inverter
output is not synchronized with
the bypass output. Check the bypass voltage and
frequency
13
Bypass ratings exceed the
normal range
Bypass voltage or frequency
exceeds the normal range and
the bypass will not power the load
anymore. Check the bypass voltage and
frequency
14
Bypass over current
timeout
If the over current time exceeds
the limit, the UPS may shut down
the bypass and the inverter. Check the load, if it is normal, then
restart the UPS
15
Shutdown due to bypass
fault
When the overload time is due in
inverter mode, if at this time the
bypass has fault, then the inverter
is shut down. Repair the bypass and reduce the load,
and then restart the UPS. Note: Don’t
let the UPS in over load state for a long
time.