EM11 User’s Manual
7. Fault Diagnosis and Solution
131
Fault Name
Display
Possible Causes
Solutions
Frequency
inverter
hardware fault
Err22
1: Overvoltage exists.
2: Over current exists.
1: Handle based on over voltage.
2: Handle based on over current.
Short circuit
to ground
Err23
The motor is short circuited to the
ground.
Replace the cable or motor.
Accumulative
running time
reached
Err26
The accumulative running time reaches
the setting value.
Clear the record through parameter
A0-09
User-defined
fault 1
Err27
1: The signal of user-defined fault 1 is
input via DI.
2:The signal of user-defined fault 1 is
input via virtual I/O.
1: Reset the operation.
2: Reset the operation.
User-defined
fault 2
Err28
1: The signal of user-defined fault 2 is
input via DI.
2:The signal of user-defined fault 2 is
input via virtual I/O.
1: Reset the operation.
2: Reset the operation.
Accumulative
power-on time
reached
Err29
The accumulative power-on time reaches
the setting value.
Clear the record through parameter
A0-09
Off load
Err30
The frequency inverter running current is
lower than the setting value.
Check that the load is
disconnected or the parameter
setting is correct.
PID feedback
lost during
running
Err31
The PID feedback is lower than the
setting of C0-26.
Check the PID feedback signal or
set C0-26 to a proper value.
By wave
current
limiting fault
Err40
1: The load is too heavy or locked- rotor
occurs on the motor.
2: The frequency inverter model is of too
small power class.
1: Reduce the load and check the
motor and mechanical condition.
2: Select a frequency inverter of
higher power class.
Motor
switchover
fault during
running
Err41
Change the selection of the motor via
terminal during running of the frequency
inverter.
Perform motor switchover after
the frequency inverter stops.
Too large
speed
deviation
Err42
1: The encoder parameters are set
incorrectly.
2: The motor auto-tuning is not
performed.
3: The detection parameters of too large
speed deviation are set incorrectly.
1: Set the encoder parameters
properly.
2: Perform the motor auto-tuning.
3: Set the detection parameters
correctly based on the actual
situation.
Motor
over-speed
Err43
1: The encoder parameters are set
incorrectly.
2: The motor auto-tuning is not
performed.
3: The over-speed detection parameters
are set incorrectly.
1: Set the encoder parameters
properly.
2: Perform the motor auto-tuning.
3: Set the over-speed detection
parameters correctly based on the
actual situation.
7. Fault Diagnosis and Solution
EM11 User’s Manual
132
Fault Name
Display
Possible Causes
Solutions
Motor
overheat
Err45
1: The cabling of the temperature sensor
becomes loose.
2: The motor temperature is too high.
1: Check the temperature sensor
cabling and eliminate the cabling
fault.
2: Lower the carrier frequency or
adopt other heat radiation
measures
Initial position
fault
Err51
1: The motor parameters are not too
deviation based on the actual situation.
1: Check that the motor parameters
are set correctly and whether the
setting of rated current is too
small.
7.2 Common Faults and Solutions
You may come across the following faults during the use of the frequency inverter. Refer to the following
table for simple fault analysis.
Table 8-2 Troubleshooting to common faults of the frequency inverter
SN
Fault
Possible Causes
Solutions
1
There is no display at
power-on.
1: There is no power supply to the
frequency inverter or the power input to the
frequency inverter is too low.
2: The power supply of the switch on the
drive board of the frequency inverter is
faulty.
3: The rectifier bridge is damaged.
4: The control board or the operation panel
is faulty.
5: The cable connecting the control board
and the drive board and the operation panel
loose or breaks.
1: Check the power supply.
2: Check the DC bus voltage.
3:Check the internal wiring plug
4: Change a keypad
5: Ask for technical support.
2
“-coc-” is displayed
at power-on.
1: The cable between the drive board and
the control board is in poor contact.
2: Related components on the control board
are damaged.
3: The motor or the motor cable is short
circuited to the ground.
4: The HALL device is faulty.
5: The power input to the frequency
inverter is too low.
1: Checking wiring
2: Ask for technical support.
3
“Err23” is displayed
at power-on.
1: The motor or the motor output cable is
short-circuited to the ground.
2: The frequency inverter is damaged.
1: Measure the insulation of the
motor and the output cable with
a megger.
2: Ask for technical support.
4
The frequency
inverter display is
normal after
power-on. But
“coc-” is displayed
after running and
stops immediately.
1: The cooling fan is damaged or
locked-rotor occurs.
2: The external control terminal cable is
short circuited.
1: Replace the damaged fan.
2: Eliminate external fault.
