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4.3 Common faults and trouble shooting
Number Problem or errors description Reason
Solution
1
Connect to city electricity,
and no display on LCD display
panel
No input power
Check if the input wiring
harness of UPS is in well
connection.
Input voltage under
voltage or overload
Use voltage meter to check the
input voltage if in normal or
meets the requirement.
2
City electricity in normal, no
AC input indication, UPS is
still working in battery mode
UPS power switch is
still off
Press UPS city electricity
power button on
The wiring harness is
loosen or in poor
connection.
Check the input wiring harness
whether in normal.
3
UPS not display error, but no
output voltage
The wiring harness is
loosen or in poor
connection
Make sure the wiring harness
in well connection.
4
Press
button, UPS does
not start
Press button too
shortly
Press
over 5 seconds, hear
"Di" sound
Overload
Remove all loads and restart
the machine.
5
With city electricity, but no
city electricity indication
Mains voltage or
frequency over UPS
input range
Use a multi-meter to check
whether the input voltage and
the input frequency meets the
requirements.
6
The battery discharge time is
lower than the standard time
The power of batteries
has been used.
Change new battery
The batteries were not
be charged fully.
Charge the batteries more
than 8 hours under normal city
electricity, then retest it.
7
Abnormal sound or smell
come out from the inside of
UPS
Inner of UPS may be
damaged
Please immediately turn off
the UPS, cut off the power
input and contact the
customer service center for
technical support.
8
Battery mode display yellow
light, long buzzer sounds,
battery capacity is
insufficient, ready to shut
down
The power of battery
is low, UPS is ready to
shut down, and the
loads will be cut off.
1. Save the data on the loads
immediately and complete
shutdown the important loads
to avoid data loss or damage.
2. Immediately connect the
UPS input terminal to the
standby AC power supply.
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