User Manual
4 Operation and Maintenance
37
In the maintenance bypass mode, there still exists electricity in the input terminals, output terminals,
and the terminals in the filter board.
4.8 Troubleshooting
As shown in Table4-1, it only includes some common fault diagnosis. If any doubt, contact the local
office or distributor for details.
Table4-1
Troubleshooting
Fault phenomenon
Possible reason
The mains is normal. When starting
UPS, it outputs normally. But it
works in the battery mode and the
buzzer beeps intermittently.
1)
Check if the contacts and sockets in the input are with
poor contact;
2)
Check if the input voltage amplitude or frequency of
mains displayed in the LCD is beyond the allowable
input range of UPS;
3)
Check if the over-current protector in the rear panel is
sprung. If yes, press the over-current protector switch.
After finishing installing UPS,
connecting with power will fuse the
fuse or cause power cut.
Output short circuit or wiring for three phase of output
error.
When starting UPS, the LCD display
and output are normal. But when
connecting with load, it will stop
outputting immediately.
1)
UPS is overload seriously or the output circuit is
short-circuit. It should reduce load to the proper
capacity or find the short-circuit reason. The common
reason is that the output changeover socket is
short-circuit or the input is short-circuit after UPS
failure.
2)
It doesn't follow the startup sequence that "high power
device
→
small power device" to start load. Restart
UPS. When UPS works steadily, start high power
device first, and start small power device successively.
Buzzer long beeps, fault indicator is
on, UPS works in the bypass mode
1)
The output is overload. The load is too heavy, which
is beyond the rated power of UPS. It should reduce
