Possible reasons for fault
Too short acceleration time
Check the AC supply voltage
Adjust V/F curve or torque
boost value
Improper motor’s overload protection threshold
Modify the motor’s overload
protection threshold.
Motor is locked or load suddenly become too big
Common motor has operated with heavy load
at low speed for a long time.
Use a special motor if the
motor is required to operate
for a long time.
Check the AC supply voltage
Set V/F curve and torque
boost value correctly
Terminal used for stopping the drive in
emergent status is closed
Disconnect the terminal if the
external fault is cleared
R/W fault of control parameters
Press STOP/RST to reset,
seek service
Check the AC supply voltage
Replace the contactor in main
circuit and seek service
Soft start resistor is damaged
Replace the soft start resistor
and seek service
Control circuit is damaged
Check the wiring of R, S, T.
Current
detection
circuit
fails
Wires or connectors of control board are loose
Auxiliary power supply is damaged
Amplifying circuit is abnormal
Panel’s parameters are not complete or the
version of the parameters are not the same
as that of the main control board
Update the panel’s
parameters and version again.
First set b4.04 to 1 to upload
the parameters and then set
b4.04 to 2 or 3 to download
the parameters.
Panel’s EEPROM is damaged
Improper settings of parameters on the
nameplate
Set the parameters correctly
according to the nameplate
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