4 Troubleshooting
- 41 -
Fault
Code
Fault Description
Possible Cause
Solution
Err04
Overcurrent at
constant speed
1) The output circuit of the
AC drive is grounded or
short circuited.
2) The control mode is SVC
but motor auto-tuning is
not performed.
3) Acceleration time is too
short under V/F control.
4) The overcurrent stall
prevention parameters
are set improperly for V/F
control.
5) The customized torque
boost or the V/F curve
is improper under V/F
control.
6) The motor is started
during rotating.
7)
The AC drive suffers
external interference.
8) The motor is short-cir-
cuited to ground or
between phases.
1) Eliminate external faults. Check
whether short-circuit occurs on
the motor or contactor.
2) Set the motor parameters accord-
ing to the motor nameplate and
perform motor auto-tuning.
3) Increase the acceleration time.
4) Ensure that current limit is en-
abled (F3-19 = 1).
The setting of F3-18 (V/F current
limit level) is too large. Adjust it
between 120% and 150%.
The setting of F3-20 (V/F current
limit gain) is too small. Adjust it
between 20 and 40.
5) Adjust the customized torque
boost or V/F curve.
6) Select rotational speed tracking
restart for the asynchronous mo-
tor or start the motor after it stops.
7) View historical fault records. If the
current value is far from the over-
current level, find the interference
source. If no external interference
exists, the drive board or hall
device may be faulty.
8) Check whether the motor is
short-circuited to ground using a
multimeter.
Err05
Overvoltage during
acceleration
1) The input voltage is too
high.
2) An external force drives
the motor during acceler-
ation.
3) The overvoltage stall
prevention parameters
are set improperly.
4) The acceleration time is
too short.
1) Adjust the voltage to the normal
range.
2) Cancel the external force.
3) Check that the voltage limit func-
tion is enabled (F3-23 = 1). If the
setting of F3-22 (V/F voltage limit)
is too large, adjust it between 700
V and 770 V. If the setting of F3-24
(V/F frequency gain for voltage lim-
it) is too small, adjust it between
30 and 50.
4) Increase the acceleration time.
