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Trouble shooting and Solutions
Display
Fault Name
Possible Causes
Solutions
Err31
PID feedback
lost during
running
The PID feedback is lower than FA-26. Check the PID feedback signal or
set FA-26 to a proper value.
Err40 Quick current
limit
1. The load is too heavy or the rotor is
locked.
2. The drive is of too small power
class.
1. Reduce the load, or check the
motor, or check the machine
whether it is locking the rotor.
2. Select a drive of higher power
class.
Err41
Motor
switchover fault
during running
The current motor is switched over
via a terminal during running of the
AC drive.
Switch over the motor only after
the AC drive stops.
Err45
Motor over-
temperature
detected by
PT100
Cable connection of the
temperature sensor becomes
loose.
Check cable connection of the
temperature sensor.
The motor temperature is too high.
Increase the carrier frequency
or take other measures to cool
the motor.
Err61
Two or three
drive output
phases loss
1. The drive output connections get
loose;
2. The output contactor gets wrongly
operated or malfunctions.
1. Check drive output
connections;
2. Check drive output contactor.
Err63
PTC over-
temperature
PTC sensor temperature higher
than 110ºC
Check whether the
temperature of the motor
connected to an external PTC
sensor exceeds 110ºC
(over-temperature threshold).
5.2 Common Symptoms and Solutions
Fault Name
Possible Causes
Solutions
There is no display
at power-on.
1. There is no power supply or the
power supply is too low.
2. The switching power supply on
the drive board is faulty.
3. The rectifier bridge is damaged.
4. The buffer resistor of the drive is
damaged.
5. The control board or the keypad
is faulty.
6. The cable between the control
board and the drive board or
keypad breaks.
1. Check the power supply.
2 to 5. Seek for maintenance.
6. Re-connect the 4-core and 28-
core flat cables, or seek for
maintenance.
