Liebert UPS System - Manual (Page 89)

Chapter 7 Troubleshooting
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7.4 LCD indication for fault information
The LCD on the UPS displays the fault information of Table 7-1 and Table 7-2. The
user should locate and analyze the fault according to the tables and feedback the
fault information to our service engineers.
Table 7-1 Fault information
No.1 Fault description Reason Actions to be taken
1
Communication of
inverter fails Communication between monitoring
unit and inverter fails
Notify the service engineer for repairing
2
Communication of
rectifier fails Communication between monitoring
unit and rectifier fails
Notify the service engineer for repairing
3
Ambient over-
temperature
over-temperature of UPS room Check the ventilation of UPS room
4
Environment
parameter 1 abnormal Environment parameter channel 1
has alarm
Check the devices relating to the channel
5
Environment
parameter 2 abnormal Environment parameter channel 2
has alarm
Check the devices relating to the channel
6
Environment
parameter 3 abnormal Environment parameter channel 3
has alarm
Check the devices relating to the channel
7
Environment
parameter abnormal 12V environment parameter channel
has alarm
Check the devices relating to the channel
8
Rectifier input voltage
abnormal
Line-to-neutral voltage of rectifier
exceeds normal operation range Check the line-to-neutral voltage
amplitude of rectifier
9
Rectifier input under-
voltage
Line-to-neutral voltage of rectifier
lower than 305V, but higher than
208V
Check the line-to-neutral voltage
amplitude of rectifier
10
Rectifier’s input
voltage frequency is
abnormal
Rectifier frequency exceeds the
normal range Check the rectifier’s input voltage
frequency
11 Input fuse blows Rectifier input fuse blows up Notify the service dept for repairing
12
Input transformer over
temperature Temperature of input transformer is
too high Check the ambient temperature and
ventilation
13
Input phase rotation
reverse Rectifier’s input phase rotation is
reverse Notify the UPS service engineer, check
the wiring of rectifier input cables
14 Input softstart fails Input softstart fails Notify the service dept for repairing