Liebert UPS System User Manual page 119

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