Output phase to phase or phase to ground short
-circuit?
auto tuning succeeds？
Deceleration time too short?
Fix the wrong wirings
Conduct auto tuning
Increase the time
Overcurrent during deceleration
Yes
No
Yes
Check if power supply is abnormal
Adjust the power
supply
Yes
No
No
No
VF control
Shock load during acceleration?
braking resistor installed?
Remove shock load
Install braking
resistor
Yes
No
Seek for support
Yes
No
Yes
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