ACD320user manual
Fault Diagnosis and countermeasures
order
number
failure phenomenon
possible reason
countermeasure
Input power of the inverter is Check the input power.
not connected.
Keyboard and the CPU board Check the wire between keyboard and
is not well wired.
the CPU board.
No display after
1
electrified.
The control board and the
power drive board is not well
wired.
Check the wire between control board
and the power drive board.
Parts of inverter damage.
Look for service from manufacturer.
Keyboard and the control Check the wire between keyboard and
Dispay 8.8.8.8.8. board is not well wired.
the control board.
2
after electrified.
Parts of inverter damage.
Look for service from manufacturer.
Earthing short circuit of motor Check the insulation of motor and
or output wire.
output wire with megger
Display U-23 after
3
electrified
The inverter is damaged.
Look for service from the
manufacturer.
Input voltage is too low.
Check the input voltage.
After electrified the
4
inverter does not
run when the RUN
DC bus-bar of inverter Check the monitoring parameters
key is pressed.
detection error
wheter DC bus bar voltage is too low
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