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NE Series (20-30kVA)
User Manual
Chapter 6 Troubleshooting
NO. Phenomena
Fault diagnosis and checking points
Solution
5
The touch screen
and LED are off.
Check if the bypass/ mains switch is
closed and the power board is fault.
Please inform
professionals to
maintain.
Check if the load is short-circuit.
Get rid of the
short-circuit point,
close the inverter, and
then restart the inverter.
Check if the fuse of inverter is fusing or
IGBT module is abnormal.
Replace the fuse or
IGBT module
6
The red DC/AC
indicator is on, and
the buzzer beeps
continuously.
Check if the input mains is power
down, and the battery is under
low-voltage protection.
It will start
automatically if the
mains normal.
7
LOAD indicator is
on.
The output of UPS is overload.
Decrease the load.
8
When power on
normally, it cannot
output normally.
Check whether the bypass/inverter SCR
drive board is fault.
Please inform
professionals to
maintain
The insert position of communication
wire is not proper.
Insert the
communication wire
properly.
The communication software is not
successful installed.
Install the software
correctly.
The setting for computer’s
communication window is wrong.
Properly set the
communication port.
9
Communication
abnormal
Above problems are all eliminated, but
it still cannot normally communicate.
Please inform
professionals to
maintain.
6.2 Deal with Common Faults
When starting the UPS, if the UPS cannot work normally, please refer to Table6-2 to look for reasons.
At the same time, please check if it is caused by environmental factors, such as temperature, humidity
not meeting the system’s requirements.
