ACD320user manual
Fault Diagnosis and countermeasures
- 123-
order
number
failure phenomenon
possible reason
countermeasure
1
No display after
electrified.
Input power of the inverter is
not connected.
Check the input power.
Keyboard and the CPU board
is not well wired.
Check the wire between keyboard and
the CPU board.
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.
2
Dispay 8.8.8.8.8.
after electrified.
Keyboard and the control
board is not well wired.
Check the wire between keyboard and
the control board.
Parts of inverter damage.
Look for service from manufacturer.
3
Display U-23 after
electrified
Earthing short circuit of motor
or output wire.
Check the insulation of motor and
output wire with megger
The inverter is damaged.
Look
for
service
from
the
manufacturer.
4
After electrified the
inverter does not
run when the RUN
key is pressed.
Input voltage is too low.
Check the input voltage.
DC
bus-bar
of
inverter
detection error
Check the monitoring parameters
wheter DC bus bar voltage is too low
