ACD320user manual
Fault Diagnosis and countermeasures
Chapter 7 Fault Diagnosis and Countermeasures
7.1 Failure and countermeasure
Possible failure types in ACD320 are shown in Table 7-1 and failure code is from U-01 to
U-23. Some failure code is reserved for intelligent automatic diagnosis function which will be
executed continuously in future. When failure takes place in the inverter, the user should check
according to note of this table first and record failure phenomena detailedly. Please contact our
after-sale service and technical support Department or agent in your local place when technical
service is needed
Failure
code
Table 7-1 failure type and the countermeasure
Failure type
Possible reason
Countermeasure
Transient overcurrent of the inverter
Refer to countermeasure for
overcurrent
phase to phase short circuit or earthing
short circuit of output 3 phase
wiring again
Wether the connecting wire from inverter
to motor is too long
Install reactor or output filter
Air-path blocked or fan damaged
To clear air-path or replace the fan
U-01
Inverting module
protection
Ambient temperature is too high
Connecting wire or insert on control
board loose
Lower ambient temperature
Check and connect the wire again
Unwonted current wave caused by
missing output phase etc.
Check wiring
Assistant power supply damaged and
Look for service from manufacturer
drive voltage lacking
or agent
Unwonted control board
Look for service from manufacturer
or agent
Wheter grounding or short circuit exist in
output loop of inverter.
wiring again
U-02
Overcurrent
during
accelerating
process
Wether the connecting wire from inverter
to motor is too long
Auto tuning of motor parameters doesnot
Install reactor or output filter
Start auto tuning of motor
run in vector control mode.
parameters
Accelerating time is too short
Prolong accelerating time
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