Delta ME300 Drive

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Wiring Details

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Faults & Alarms

Search from below list for ME300 drive faults & alarms:

Fault CodeCause & Solution
uC
Under
current		Meaning: Low current.

Cause & Solution:

1. Broken motor cable
– Exclude the connection issue of the motor and its load.

2. Improper setting for the low current protection
– Set the proper settings for Pr.06-71, Pr.06-72 and Pr.06-73.

3. Low load Check the loading status.
– Make sure the loading matches the motor capacity.

4. Warning setting parameter: Pr.06-73
– 0: No function
– 1: Fault and coast to stop
– 2: Fault and ramp to stop by the 2 nd deceleration time
– 3: Warn and continue operation

5. Reset method:
– Auto “Warning” occurs when Pr.06-73=3. The “Warning” automatically clears when the output current is larger than (Pr.06-71+0.1 A).
– Manual “Error” occurs when Pr.06-73=1 and 2. You must reset manually.
oL
Over load		Meaning: The AC motor drive detects excessive drive output current. When the load is higher than the protection level and exceeds allowable time, the oL protection activates.

Overload capacity:
– Normal duty: Sustains for one minute when the drive outputs 120% of the drive’s rated output current. Sustains for three seconds when the drive outputs 150% of the drive’s rated output current.
– Heavy duty: Sustains for one minute when the drive outputs 150% of the drive’s rated output current. Sustains for three seconds when the drive outputs 200% of the drive’s rated output current.

Cause & Solution:

1. The load is too large
– Reduce the load Accel./Decel. time or the working cycle are too short
– Increase the setting value for Pr.01-12–01-19 (accel./decel. time)

2. V/F voltage is too high
– Adjust the settings for Pr.01-01–01-08 (V/F curve), especially the setting value for the mid-point voltage (if the mid-point voltage is set too low, the load capacity decreases at low speed).
– Refer to the V/F curve selection of Pr.01-43.

3. The capacity of the drive is too small
– Replace the drive with a larger capacity model.

4. Overload during low-speed operation
– Reduce the load during low-speed operation.
– Increase the drive capacity.
– Decrease the carrier frequency of Pr.00-17.

5. Torque compensation is too large
– Adjust the torque compensation (refer to Pr.07-26 Torque Compensation Gain) until the output current reduces and the motor does not stall.

6. Check if the setting for stall prevention is correct.
– Set the stall prevention to the proper value.

7. Output phase loss
– Check the status of three-phase motor.
– Check if the cable is broken or the screws are loose.

8. Improper parameter settings for the speed tracking function (including restart after momentary power loss and restart after fault) Correct the parameter settings for speed tracking.
– 1. Start the speed tracking function.
– 2. Adjust the maximum current for Pr.07-09 speed tracking
uC
Under
current		Meaning: Low current detection.

Fault treatment parameter Pr.06-73
– 0: No function
– 1: Fault and coast to stop
– 2: Fault and ramp to stop by the 2nd deceleration time
– 3: Warn and continue operation

Cause & Solution:

1. Motor cable disconnection
– Troubleshoot the connection between the motor and the load.

2. Improper setting of low-current protection
– Reset Pr.06-71, Pr.06-72 and Pr.06-73 to proper settings.

3. The load is too low
– Check the load status.
– Check if the motor capacity matches the load.
EF
External
fault		Meaning: External fault. This is programmable fault, comes when drive received external signal for external fault.
– When the drive decelerates based on the setting of Pr.07-20, the EF fault displays on the keypad.

Fault treatment parameter Pr.07-20
– 0: Coast to stop
– 1: Stop by the 1 st deceleration time
– 2: Stop by the 2 nd deceleration time
– 3: Stop by the 3 rd deceleration time
– 4: Stop by the 4 th deceleration time
– 5: System deceleration
– 6: Automatic deceleration (Pr.01-46)

Cause & Solution:

1. External fault
– Press RESET key after the fault is cleared.
bb
External base
block		Meaning: When the contact of MIx=bb is ON, the output stops immediately and displays bb on the keypad. The motor is in free running.

Cause & Solution:

1. When MIx=bb activates
– Verify if the system is back to normal condition, and then press “RESET” key to go back to the default.
CE3
Communication
error 3		Cause & Solution: (CE3 – RS-485 Modbus illegal data value: When the length of communication data is too long)

1. Incorrect communication command from upper unit: Check if the communication command is correct.
2. Malfunction caused by interference: Verify the wiring and grounding of the communication circuit. It is recommended
to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance.
3. Different communication setting from the upper unit: Check if the setting for Pr.09-02 is the same as the setting for the upper unit.
4. Disconnection or bad connection of the cable: Check the cable and replace it if necessary.

Reset method: “Warning” occurs when Pr.09-02=0 and the motor drive keeps running. The drive resets automatically when receiving the correct communication data value.
CE4
Communication
error 4		Cause & Solution: (CE4 – RS-485 Modbus data is written to read-only address: When the data is written to read-only address.)

1. Incorrect communication command from upper unit: Check if the communication command is correct.
2. Malfunction caused by interference: Verify the wiring and grounding of the communication circuit. It is recommended to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance.
3. Different communication setting from the upper unit: Check if the setting for Pr.09-02 is the same as the setting for the upper unit.
4. Disconnection or bad connection of the cable: Check the cable and replace it if is necessary.

Reset method: “Warning” occurs when Pr.09-02=0 and the motor drive keeps running. The drive resets automatically when receiving the correct written address of communication data.
CE10
Communication
error 10		Cause & Solution: (CE10- RS-485 Modbus transmission time-out: When the communication time exceeds the detection time of Pr.09-03 communication time-out)

1. The upper unit does not transmit the communication command within Pr.09-03 setting time: Check if the upper unit transmits the communication command within the setting time for Pr.09-03.
2. Malfunction caused by interference: Verify the wiring and grounding of the communication circuit. It is recommended to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance.
3. Different communication setting from the upper unit: Check if the setting for Pr.09-02 is the same as the setting for the upper unit.
4. Disconnection or bad connection of the cable: Check the cable and replace it if necessary.

Reset method: “Warning” occurs when Pr.09-02=0 and the motor drive keeps running. The drive resets automatically when receiving the next communication packet.
SE1
Save error 1		Cause: Keypad COPY error 1: Keypad copy time-out- “SE1” warning occurs when the keypad does not transmit the COPY command to the drive, and does not transmit any data to the drive again in 10 ms at the time you copy the parameters to the drive.
– Communication connection error
– Keypad error
– Control board error

Solution

1. The causes of error are mostly communication problems between the keypad and control board. Potential causes include communication signal interference and the unacceptable communication command to the Slave.
2. Check if the error occurs randomly, or only occurs when copying certain parameters (the error displays on the upper right corner of the copy page)
SE2
Save error 2		Keypad COPY error 2: parameter writing error- “SE2” warning occurs when writing the parameters incorrectly at the time you copy parameters to the drive. For example, you copy the new firmware version with added parameters to the drive with old firmware version.

Cause:

– Add new parameters to the new firmware version.
– Malfunction caused by interference.

Solution:

1. In this stage, the copied data has been transmitted to the Slave.
2. The Slave compares and processes the copied data, and then saves the data to the Data ROM. During the process, the data error (should be attribution error) may occur, or the data cannot be saved to EEPROM. At this time, the warning occurs.
3. It is suggested to check the status of Data ROM and remove the error causes first.
4. Verify the wiring and grounding of the main circuit, control circuit and the encoder for effective anti-interference performance.
oH1
IGBT
over-heating
warning		The AC motor drive detects IGBT overheating and exceeds the protection level of oH1 warning. (When Pr.06-15 is higher than the IGBT overheating protection level, the drive shows oH1 error without displaying oH1 warning.)
– “oH1” warning occurs when IGBT temperature is higher than Pr.06-15 setting value.

Cause & Solution:

1. Check if the ambient temperature or temperature inside the cabinet is too high, or if there is obstruction in the ventilation hole of the control cabinet.
– Check the ambient temperature.
– Regularly inspect the ventilation hole of the control cabinet.
– Change the installed place if there are heating objects, such as brake resistors, in the surroundings.
– Install/ add cooling fan or air conditioner to lower the temperature inside the cabinet.

2. Check if there is any obstruction on the heat sink or if the fan is running
-Remove the obstruction or replace the cooling fan.

3. Insufficient ventilation space
– Increase ventilation space of the drive.

4. Check if the drive matches the corresponded loading
– Decrease loading.
– Decrease the carrier wave.
– Replace with a drive with larger capacity.

5. The drive has run 100% or more of the rated output for a long time.
– Replace with a drive with larger capacity.
PID
PID feedback
error		Meaning: PID feedback loss (warning for analog feedback signal; works only when PID enables).
– When the analog input is lower than 4 mA (only detects analog input 4–20 mA)

Cause & Solution:

1. Loose or broken PID feedback wiring
– Tighten the terminals again.
– Replace with a new cable.

2. Feedback device malfunction
– Replace with a new feedback device.

3. Hardware error
– If the PID error still occurs after checking all the wiring, return to the factory for repair.

4. Warning setting parameter – Pr.08-09
– 0: Warn and continue operation
– 1: Fault and ramp to stop
– 2: Fault and coast to stop
– 3: Warn and operate at last frequency

5. Reset method
– Auto “Warning” occurs when Pr.08-09=0 or 3. The “Warning” automatically clears when the feedback signal is larger than 4 mA.
– Manual “Error” occurs when Pr.08-09=1 or 2. You must reset manually.
AnL
ACI analog
signal loss		Meaning: Analog input current loss (including all analog 4–20 mA signals)
– When the analog input is lower than 4 mA (only detects analog input 4–20 mA)

Cause & Solution:

1. Loose or broken ACI wiring
– Tighten the terminals again.
– Replace with a new cable.

2. External device error
– Replace with a new device.

3. Hardware error
– If the AnL error still occurs after checking all the wiring, return to the factory for repair.

4. Warning setting parameter: Pr.03-19
– 0: Disable
– 1: Continue operation at the last frequency (warning, keypad displays ANL)
– 2: Decelerate to 0 Hz (warning, keypad displays ANL)
– 3: Stop immediately and display “ACE”

5. Reset method
– Auto “Warning” occurs when Pr.03-19=1 or 2. The “Warning automatically clears when the analog input signal is larger than 4 mA.
– Manual “Error” occurs when Pr.03-19=3. You must reset manually.
uC
Under
current		Meaning: Low current.

Cause & Solution:

1. Broken motor cable
– Exclude the connection issue of the motor and its load.

2. Improper setting for the low current protection
– Set the proper settings for Pr.06-71, Pr.06-72 and Pr.06-73.

3. Low load Check the loading status.
– Make sure the loading matches the motor capacity.

4. Warning setting parameter: Pr.06-73
– 0: No function
– 1: Fault and coast to stop
– 2: Fault and ramp to stop by the 2 nd deceleration time
– 3: Warn and continue operation

5. Reset method:
– Auto “Warning” occurs when Pr.06-73=3. The “Warning” automatically clears when the output current is larger than (Pr.06-71+0.1 A).
– Manual “Error” occurs when Pr.06-73=1 and 2. You must reset manually.
ot1
Over-torque 1		Meaning: Over-torque 1 warning.

Cause & Solution:

1. Incorrect parameter setting
– Configure the settings for Pr.06-07 and Pr.06-08 again.

2. Mechanical error (e.g. mechanical lock due to over-torque)
– Remove the causes of malfunction.

3. The load is too large
– Decrease the loading.
– Replace with a motor with larger capacity.

4. Accel./ Decel. time and working cycle is too short
– Increase the setting values for Pr.01-12–01-19 (accel./ decel. time)

5. V/F voltage is too high
– Adjust the V/F curve (Motor 1, Pr.01-01–01-08), especially the setting value for the mid-point voltage (if the mid-point voltage is set too small, the load capacity decreases at low-speed).

6. The motor capacity is too small
– Replace with a motor with larger capacity.

7. Overload during low-speed operation
– Decrease the loading during low-speed operation.
– Increase the motor capacity.

8. The torque compensation is too large
– Adjust the torque compensation value (Pr.07-26 torque compensation gain) until the output current decreases and the motor does not stall.

9. Improper parameter settings for the speed tracking function (including restart after momentary power loss and restart after fault)
– Correct the parameter settings for speed tracking.
– Start the speed tracking function.
– Adjust the maximum current for Pr.07-09 speed tracking.

10. Incorrect parameter setting
– Configure the settings for Pr.06-07 and Pr.06-08 again.

11. Warning setting parameter Pr.06-06 Over-torque Detection Selection (Motor 1) =1 or 3
– 0: No function
– 1: Continue operation after over-torque detection during constant speed operation
– 2: Stop after over-torque detection during constant speed operation
– 3: Continue operation after over-torque detection during RUN
– 4: Stop after over-torque detection during RUN
ot2
Over-torque		Meaning: Over-torque 2 warning.

Cause & Solution:

1. Incorrect parameter setting
– Configure the settings for Pr.06-10 and Pr.06-11

2. Mechanical error (e.g. mechanical lock due to over-torque)
– Remove the causes of malfunction.

3. The load is too large
– Decrease the loading.
– Replace with a motor with larger capacity.

4. Accel./ Decel. time and working cycle is too short
– Increase the setting values for Pr.01-12–01-19 (accel./ decel. time)

5. V/F voltage is too high
– Adjust the V/F curve (Motor 2, Pr.01-35–01-42), especially the setting value for the mid-point voltage (if the mid-point voltage is set too small, the load capacity decreases at low-speed).

6. Warning setting parameter Pr.06-09 Over-torque Detection Selection (Motor 2) =1 or 3
– 0: No function
– 1: Continue operation after over-torque detection during constant speed operation
– 2: Stop after over-torque detection during constant speed operation
– 3: Continue operation after over-torque detection during RUN
– 4: Stop after over-torque detection during RUN
oH3
Motor
over-heating
PTC		Meaning: Motor overheating warning- The AC motor drive detects the temperature inside the motor is too high.
– Pr.03-00=6 (PTC), PTC input level > Pr.06-30 PTC level (default=50%).

Cause & Solution:

1. Motor locked
– Clear the motor lock status.

2. The load is too large Decrease the loading.
– Replace with a motor with larger capacity.

3. Ambien temperature is too high
– Change the installed place if there are heating devices in the surroundings. Install/ add cooling fan or air conditioner to lower the ambient temperature.

4. Motor cooling system error
– Check the cooling system to make it work normally.

5. Motor fan error
– Replace the fan.

6. Operates at low-speed too long
– Decrease low-speed operation time. Change to dedicated motor for the drive. Increase the motor capacity.

7. Accel./ Decel. time and working cycle is too short
– Increase setting values for Pr.01-12–01-19 (accel./ decel. time).

8. V/F voltage is too high
– Adjust settings for Pr.01-01–01-08 (V/F curve), especially the setting value for the mid-point voltage (if the mid-point voltage is set too small, the load capacity decreases at low-speed).

9. Check if the motor rated current matches the motor nameplate
– Configure the correct rated current value of the motor again.

10. Warning setting parameter Error treatment: Pr.06-29
– 0: Warn and continue operation
– 1: Fault and ramp to stop
– 2: Fault and coast to stop
– 3: No warning
– When Pr.06-29=0 and when the temperature is ≦ Pr.06-30 level, the oH3 warning automatically clears.
– When Pr.06-29=0 (“Warning”), it automatically resets.

11. Reset method: When Pr.06-29=0, oH3 displays as “Warning”. When the temperature is ≦ Pr.06-30 level, the oH3 warning automatically clears.

12. Check if the PTC is properly set and wired
– Check the connection between PTC thermistor and the heat protection.

13. Check if the setting for stall prevention is correct
– Set the stall prevention to the proper value.

14. Unbalanced three-phase impedance of the motor
– Replace the motor.

15. Harmonics is too high
– Use remedies to reduce harmonics.
oH3
Motor
over-heating
PT100		Meaning: Motor overheating warning- The AC motor drive detects the temperature inside the motor is too high.
– Pr.03-00=11 (PT100), PT100 input level > Pr.06-57 (default=7 V).

Cause & Solution:

1. Motor locked
– Clear the motor lock status.

2. The load is too large
– Decrease loading.
– Replace with a motor with larger capacity.

3. Ambien temperature is too high
– Change the installed place if there are heating devices in the surroundings.
– Install/ add cooling fan or air conditioner to lower the ambient temperature.

4. Motor cooling system error
– Check the cooling system to make it work normally.

5. Motor fan error
– Replace the fan.

6. Operates at low-speed too long
– Decrease low-speed operation time.
– Change to dedicated motor for the drive.
– Increase the motor capacity.

7. Check if the PT100 is properly set and wired
– Check the connection between PT100 thermistor and the heat protection.

8.Check if the motor rated current matches the motor nameplate
– Configure the correct rated current value of the motor again.

9. Accel./ Decel. time and working cycle is too short
– Increase the setting values for Pr.01-12–01-19 (accel./ decel. time).

10. Warning setting parameter Error treatment: Pr.06-29
– 0: Warn and continue operation
– 1: Fault and ramp to stop
– 2: Fault and coast to stop
– 3: No warning
– When Pr.06-29=0 and when the temperature is < Pr.06-56 level, the oH3 warning automatically clears.
– If the temperature is between Pr.06-56 and Pr.06-57, the frequency outputs according to the operating frequency setting for Pr.06-58.

11. Reset method When Pr.06-29=0, oH3 displays as “Warning”. When the temperature is < Pr.06-56 level, the oH3 warning automatically clears.
oSL
Over slip
warning		Meaning: Over slip warning- By using the maximum slip (Pr.10-29) as the base, when the drive outputs at constant speed, and the F>H or F – When the drive outputs at constant speed, and F>H or F
Cause & Solution:

1. Check if the motor parameter is correct
– Check the motor parameter.

2. The load is too large
– Decrease the loading.

3. Check if the settings for Pr.07-29, Pr.07-30 and Pr.10-29 are properly set
– Check the parameter settings for oSL protection.

4. Warning setting parameter Pr.07-31=0 Warning
– 0: Warn and continue operation
– 1: Fault and ramp to stop
– 2: Fault and coast to stop
– 3: No warning

5. Reset method: When Pr.07-31=0 and when the drive outputs at constant speed, and F>H or F
tUn
Auto tuning		Meaning: Parameter auto-tuning is processing. When running auto-tuning, the keypad displays “tUn”.
– When running Pr.05-00 motor parameter auto-tuning, the keypad displays “tUn”.

Cause & Solution:

1. The motor parameter is running auto-tuning
– When the auto-tuning is finished, the warning automatically clears.

2. Reset method: When auto-tuning is finished and no error occurs, the warning automatically clears.
oPHL
Output
phase loss		Meaning: Output phase loss of the drive. This fault also comes when you run drive without motor or one of phase is not connected.

Cause & Solution:

1. Unbalanced three-phase impedance of the motor Replace the motor.

2. Check if the wiring is incorrect Check the cable.
– Replace the cable.

3. Check if the motor is a single-phase motor
– Choose a three-phase motor.

4. Check if the current sensor is broken
– Check if the control board cable is loose. If yes, reconnect the cable and run the drive to test. If the error still occurs, return to the factory for repair.
– Check if the three-phase current is balanced with a current clamp meter. If the current is balanced and the oPHL error still shows on the display, then need to repair or replace drive.

5. Check if capacity of the drive is larger than the motor
– Choose a drive’s capacity matches a motor’s.

6. Warning setting parameter Pr.06-45
– 0: Warn and continue operation
– 1: Fault and ramp to stop
– 2: Fault and coast to stop
– 3: No warning
SE3
save
error 3		Meaning– Keypad COPY error 3: copy model error
– “SE3” warning occurs when different drive identity codes are found during copying parameters.

Cause & Solution:

1. Keypad copy between different power range drives.
– It is mainly to prevent parameter copies between different HP/models.
dEb
Deceleration
energy
backup error		Meaning: When Pr.07-13 is not 0, and the power is suddenly off, causing the DC bus voltage lower than the dEb action level, the dEb function acts and the motor ramps to stop. Then dEb displays on the keypad.
– When Pr.07-13 is not 0, and the DC bus voltage is lower than the level of dEb.

Cause & Solution:

1. Unstable power source or the power is off
– Check the power system.

2. There is any other large load operates in the power system
– 1. Replace power system with a larger capacity.
– 2. Use a different power system from the large load system.
dEv/dEu
PID feedback
error		Cause: PID feedback fault.

Solution:

1. PID feedback loss
– Verify if any feedback mistake or loss.
2. Pressure sensor fault
– Verify if any feedback mistake or loss.
3. Insufficient pressure
– Verify if any feedback mistake or loss.
4. Reset condition: When the feedback value is back to the setting range of Pr.08-13, this warning resets automatically.
ocA
Over-current
during
acceleration		Cause: Output current exceeds three times of the rated current during acceleration.
– When ocA occurs, the drive closes the gate of the output immediately, the motor runs freely, and the display shows an ocA error.

Cause & Solution:

1. Acceleration time is too short
– Increase the acceleration time
– Increase the acceleration time of S-curve
– Set auto-acceleration and auto-deceleration parameter (Pr.01-44)
– Set over-current stall prevention function (Pr.06-03)
– Replace the drive with a larger capacity model.

2. Short circuit at motor output due to poor insulation wiring
– Check the motor cable and remove causes of the short circuits, or replace the cable before turning on the power.

3. Check for possible burnout or aging insulation of the motor
– Check the motor insulation value with megger. Replace the motor if the insulation is poor.

4. The load is too large.
– Check if the output current during the whole working process exceeds the AC motor drive’s rated current. If yes, replace the AC motor drive with a larger capacity model.

5. Impulsive change of the load
– Reduce the load or increase the capacity of AC motor drive.

6. Use special motor or motor with larger capacity than the drive
– Check the motor capacity (the rated current on the motor’s nameplate should ≤ the rated current of the drive)

7. Use ON/OFF controller of an electromagnetic contactor at the output (U/V/W) of the drive
– Check the action timing of the contactor and make sure it is not turned ON/OFF when the drive outputs the voltage.

8. V/F curve setting error
– Adjust the V/F curve setting and frequency/voltage. When the fault occurs, and the frequency voltage is too high, reduce the voltage.

9. Torque compensation is too large
– Adjust the torque compensation (refer to Pr.07-26 torque compensation gain) until the output current reduces and the motor does not stall.

10. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent interference.

11. The motor starts when in free run Enable the speed tracking during start-up of Pr.07-12. Improper parameter settings for the speed tracking function (including restart after momentary power loss and restart after fault)
Correct the parameter settings for speed tracking.
– 1. Start the speed tracking function.
– 2. Adjust the maximum current for Pr.07-09 speed tracking.

12. Incorrect combination of control mode and used motor
– Check the settings for Pr.00-11 control mode:
– 1. For IM, Pr.00-11=0, 1, 2, 3, 5
– 2. For PM, Pr.00-11=4, 6, or 7

13 The length of motor cable is too long
– Increase the AC motor drive’s capacity.
– Install AC reactor(s) on the output side (U/V/W).

14 Hardware failure
– The ocA occurs due to the short circuit or ground fault at the output side of the drive.
– Check for possible short circuits between terminals with the electric meter: B1 corresponds to U, V and W; DC- corresponds to U, V and W; corresponds to U, V and W.
– If short circuit occurs, return to the factory for repair.

15. Check if the setting for stall prevention is correct
– Set the stall prevention to the proper value.
ocd
Over-current
during
deceleration		Meaning: Output current exceeds three times of the rated current during deceleration.
– When ocd occurs, the drive closes the gate of the output immediately, the motor runs freely, and the display shows an ocd error.

Cause & Solution:

1. Deceleration time too short
– 1. Increase the deceleration time
– 2. Increase the deceleration time of S-curve
– 3. Set auto-acceleration and auto-deceleration parameter (Pr.01-44)
– 4. Set over-current stall prevention function (Pr.06-03)
– 5. Replace the drive with a larger capacity model

2. Check if the mechanical brake of the motor activates too early
– Check the action timing of the mechanical brake.

3. Short-circuit at motor output due to poor insulation wiring
– Check the motor cable and remove causes of the short circuits, or replace the cable before turning on the power.

4. Check for possible burnout or aging insulation of the motor.

5. Check the motor insulation value with megger.
– Replace the motor if the insulation is poor.

6. The load is too large
– Check if the output current during the whole working process exceeds the AC motor drive’s rated current.
– If yes, replace the AC motor drive with a larger capacity model.

7. Impulsive change of the load Reduce the load or increase the capacity of AC motor drive.Use special motor or motor with larger capacity than the drive
– Check the motor capacity (the rated current on the motor’s nameplate should ≤ the rated current of the drive)

8. Use ON/OFF controller of an electromagnetic contactor at the output (U/V/W) of the drive
– Check the action timing of the contactor and make sure it is not turned ON/OFF when the drive outputs the voltage.

9. V/F curve setting error
– Adjust the V/F curve settings and frequency/voltage. When the fault occurs, and the frequency voltage is too high, reduce the voltage.

10. Torque compensation is too large
– Adjust the torque compensation (refer to Pr.07-26 torque compensation gain) until the output current reduces and the motor does not stall.

11. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent interference.

12. The length of motor cable is too long
– Increase the AC motor drive’s capacity
– Install AC reactor(s) on the output side (U/V/W)

13. Hardware error
– The ocd occurs due to the short circuit or ground fault at the output side of the drive.
– Check for possible short circuits between terminals with the electric meter: B1 corresponds to U, V and W; DC- corresponds to U, V and W; corresponds to U, V and W.
ocn
Over-current
during
steady
operation		Meaning: Output current exceeds three times of the rated current during constant speed.
When ocn occurs, the drive closes the gate of the output immediately, the motor runs freely, and the display shows an ocn error.

Cause & Solution:

1. Short-circuit at motor output due to poor insulation wiring
Check the motor cable and remove causes of the short circuits, or replace the cable before turning on the power.

2. Check for possible shaft lock, burnout or aging insulation of the motor
– Troubleshoot the motor shaft lock.
– Check the motor insulation value with megger. Replace the motor if the insulation is poor.

3. Impulsive change of the load
– Reduce the load or increase the capacity of AC motor drive.

4. Use special motor or motor with larger capacity than the drive
– Check motor capacity (the rated current on the motor’s nameplate should ≤ the rated current of the drive)

5. Use ON/OFF controller of an electromagnetic contactor at the output (U/V/W) of the drive
– Check the action timing of the contactor and make sure it is not turned ON/OFF when the drive outputs the voltage.

6. V/F curve setting error
– Adjust the V/F curve settings and frequency/voltage. When the fault occurs, and the frequency voltage is too high, reduce the voltage.

7. Torque compensation is too large.
– Adjust the torque compensation (refer to Pr.07-26 torque compensation gain) until the output current reduces and the motor does not stall.

8. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent interference.

9. The length of motor cable is too long
– Increase the AC motor drive’s capacity.
– Install AC reactor(s) on the output side (U/V/W).

10 Hardware failure
– The ocn occurs due to the short circuit or ground fault at the output side of the drive.
– Check for possible short circuit between terminals with the electric meter: B1 corresponds to U, V and W; DC- corresponds to U, V, and W; corresponds to U, V, and W.
GFF
Ground fault		Meaning: When the drive detects grounding short circuit on the output terminals (U/V/W), the drive closes the gate of the output immediately, the motor runs freely, and the display shows a GFF error.

Cause & Solution:

1. Motor burnout or aging insulation occurred
– Check the motor insulation value with megger.
– Replace the motor if the insulation is poor.

2. Short circuit due to broken cable
– Troubleshoot the short circuit.
– Replace the cable.

3. Larger stray capacitance of the
– cable and terminal
– If the motor cable length exceeds 100 m, decrease the setting value for the carrier frequency.
– Take remedies to reduce stray capacitance.

4. Malfunction caused by interference
– Verify the grounding and wiring of the communication circuit. It is recommended to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance.

5. Hardware failure
– Cycle the power after checking the status of motor, cable and cable length. If GFF still exists, return to the factory for repair.
ocS
Over-current
at stop		Meaning: Over-current or hardware failure in current detection at stop.

Cause & Solution:

1. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent interference.

2. Hardware failure
– Check if other error codes such as cd1–cd3 occur after cycling the power
ovA/ouA
Over-voltage
during
acceleration		Meaning: DC bus over-voltage during acceleration. When ovA occurs, the drive closes the gate of the output, the motor runs freely, and the display shows an ovA error.

Cause & Solution:

1. Acceleration is too slow (e.g. hen lifting load decreases acceleration time)
– Decrease the acceleration time
– Use a braking unit or DC bus
– Replace the drive with a larger capacity model.

2. The setting for stall prevention level is smaller than no-load current
– The setting for the stall prevention level should be larger than no-load current

3. Power voltage is too high
– Check if the input voltage is within the rated AC motor drive input voltage range, and check for possible voltage spikes.

4. ON/OFF switch action of phase-in capacitor in the same power system
– If the phase-in capacitor or active power supply unit acts in the same power system, the input voltage may surge abnormally in a short time. In this case, install an AC reactor.

5. Regenerative voltage of motor inertia
– Use over-voltage stall prevention function (Pr.06-01)
– Use auto-acceleration and auto-deceleration setting (Pr.01-44)
– Use a braking unit or DC bus

6. Acceleration time is too short
– Check if the over-voltage warning occurs after acceleration stops.

When the warning occurs, do the following:
– 1. Increase the acceleration time
– 2. Set Pr.06-01 over-voltage stall prevention
– 3. Increase the setting value for Pr.01-25 S-curve acceleration arrival time 2

7. Motor ground fault
– The ground short circuit current charges the capacitor in the main circuit through the power.
– Check if there is ground fault on the motor cable, wiring box and its internal terminals.
– Troubleshoot the ground fault.

8. Incorrect wiring of brake resistor or brake unit
– Check the wiring of the brake resistor and braking unit.

9. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit
to prevent interference.
ovd/oud
Over-voltage
during
deceleration		Meaning: DC bus over-voltage during deceleration. When ovd occurs, the drive closes the gate of the output immediately, the motor runs freely, and the display shows an ovd error.

Cause & Solution:

1. Deceleration time is too short, causing too large regenerative energy of the load
– 1. Increase the setting value of Pr.01-13, Pr.01-15, Pr.01-17 and Pr.01-19 (deceleration time)
– 2. Connect the brake resistor, braking unit or DC bus on the drive.
– 3. Reduce the brake frequency.
– 4. Replace the drive with a larger capacity model.
– 5. Use S-curve acceleration/deceleration.
– 6. Use over-voltage stall prevention (Pr.06-01).
– 7. Use auto-acceleration and auto-deceleration (Pr.01-44).
– 8. Adjust the braking level (Pr.07-01 or the bolt position of the brake unit).

2. The setting for stall prevention level is smaller than no-load current
– The setting for the stall prevention level should be larger than no-load current

3. Power voltage is too high
– Check if the input voltage is within the rated AC motor drive input voltage range, and check for possible voltage spikes.

4. ON/OFF switch action of phase-in capacitor in the same power system
– If the phase-in capacitor or active power supply unit acts in the same power system, the input voltage may surge abnormally in a short time. In this case, install an AC reactor.

5. Motor ground fault
– The ground short circuit current charges the capacitor in the main circuit through the power.
– Check if there is ground fault on the motor cable, wiring box and its internal terminals.
– Troubleshoot the ground fault.

6. Incorrect wiring of brake resistor or brake unit
– Check the wiring of the brake resistor or braking unit.

7. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent interference.
ovS/ouS
Over-voltage
at stop		Meaning: Over-voltage at stop, this fault comes when you stop drive.

Cause & Solution:

1. Power voltage is too high Check if the input voltage is within the rated AC motor drive input voltage range,
and check for possible voltage spikes.

2. ON/OFF switch action of phase-in capacitor in the same power system
– If the phase-in capacitor or active power supply unit activates in the same power system, the input voltage may surge abnormally in a short time. In this case, install an AC reactor.

3. Incorrect wiring of brake resistor or brake unit
– Check the wiring of the brake resistor or braking unit.

4. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent interference.

5. Hardware failure in voltage detection
– Check if other error codes such as cd1–cd3 occur after cycling the power. If yes, return to the factory for repair.

6. Motor ground fault
– The ground short circuit current charges the capacitor in the main circuit through the power.
– Check if there is ground fault on the motor cable, wiring box and its internal terminals.
– Troubleshoot the ground fault.
ovn/oun
Over-voltage
during
constant speed		Meaning: DC bus over-voltage at constant speed. When ovn occurs, the drive closes the gate of the output immediately, the motor runs freely, and the display shows an ovn error.

Cause & Solution:

1. Impulsive change of the load
– 1. Connect the brake resistor, braking unit or DC bus to the drive.
– 2. Reduce the load.
– 3. Replace the drive with a larger capacity model.
– 4. Adjust the braking level (Pr.07-01 or bolt position of the brake unit).

2. The setting for stall prevention level is smaller than no-load current
– The setting for the stall prevention level should be larger than no-load current

3. Power voltage is too high
– Check if the input voltage is within the rated AC motor drive input voltage range, and check for possible voltage spikes.

4. ON/OFF switch action of phase-in capacitor in the same power system
– If the phase-in capacitor or active power supply unit acts in the same power system, the input voltage may surge abnormally in a short time. In this case, install an AC reactor.

5. Motor ground fault
– The ground short circuit current charges the capacitor in the main circuit through the power.
– Check if there is ground fault on the motor cable, wiring box and its internal terminals.
– Troubleshoot the ground fault.

6. Incorrect wiring of brake resistor or brake unit
– Check the wiring of the brake resistor or braking unit.

7. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent interference.
LvA/LuA
Low-voltage
during
acceleration		Meaning: DC bus voltage is lower than Pr.06-00 setting value during acceleration.

Cause & Solution:

1. Power-off
– Improve power supply condition.

2. Power voltage changes
– Adjust voltage to the power range of the drive

3. Start up the motor with large capacity
– Check the power system.
– Increase the capacity of power equipment.

4. The load is too large
– Reduce the load.
– Increase the drive capacity.
– Increase the acceleration time.

5. Check if there is short circuit plate or any DC reactor installed between terminal +1 and +2
– Connect short circuit plate or DC reactor between terminal +1 and +2.
Lvd/Lud
Low-voltage
during
deceleration		Meaning: DC bus voltage is lower than Pr.06-00 setting value during deceleration.

Cause & Solution:

1. Power-off
– Improve power supply condition.

2. Power voltage changes
– Adjust voltage to the power range of the drive.

3. Start up the motor with large capacity
– Check the power system.
– Increase the capacity of power equipment.

4. Sudden load
– Reduce the load.
– Increase the drive capacity.

5. DC bus
– Install DC reactor(s).
Lvn/Lun
Low-voltage at
constant speed		Meaning: DC bus voltage is lower than Pr.06-00 setting value at constant speed.

Cause & Solution:

1. Power-off
– Improve power supply condition.

2. Power voltage changes
– Adjust voltage to the power range of the drive.

3. Start up the motor with large capacity
– Check the power system.
– Increase the capacity of power equipment.

4. Sudden load
– Reduce the load.
– Increase the drive capacity.

5. DC bus
– Install DC reactor(s).
LvS/LuS
Low-voltage
at stop		Meaning:

1. DC bus voltage is lower than Pr.06-00 setting value at stop
2. Hardware failure in voltage detection

Cause & Solution:

1. Power-off
– Improve power supply condition.

2. Incorrect drive models
– Check if the power specification matches the drive.

3. Power voltage changes
– Adjust voltage to the power range of the drive.
– Cycle the power after checking the power. If LvS error still exists then need to repair drive.

4. Start up the motor with large capacity
– Check the power system.
– Increase the capacity of power equipment.

5. DC bus Install DC reactor(s).
orP
Phase loss
protection		Meaning: Phase loss of power input- When DC bus ripple is higher than the protection level, and the output current exceeds 50% of the rated current, the drive starts counting. When the counting value reaches the upper limit, an orP error occurs.

Cause & Solution:

1. Phase loss of input power
– Correctly install the wiring of the main circuit power.

2. Single phase power input to three-phase model
– Choose the model whose power matches the voltage.

3. Power voltage changes
– If the main circuit power works normally, verify the main circuit.
– Cycle the power after checking the power, if orP error still exists, then need to repair drive.

4. Loose wiring terminal of input power
– Tighten the terminal screws according to the torque described in the user manual.

5. The input cable of three-phase power is cut off Wire correctly.
– Replace the cut off cable.

6. Input power voltage changes too much
– Verify the setting value for Pr.06-50 Time for Input Phase Loss Detection and Pr.06-52 Ripple of Input Phase Loss

7. Unbalanced three-phase of input power
– Check the power three-phase status.
oH1
IGBT
overheating		Meaning: IGBT temperature exceeds the protection level.
– When the setting for Pr.06-15 is higher than the oH1 level, oH1 error occurs instead of oH1 warning. An IGBT overheating error occurs, and the drive stops.

Cause & Solution:

1. Check if the ambient temperature or temperature inside the control cabinet is too high, or if there is obstruction in the ventilation hole of the control cabinet.
– 1. Check ambient temperature.
– 2. Regularly inspect the ventilation hole of the control cabinet.
– 3. Change the installed place if there are heating objects, such as brake resistors, in the surroundings.
– 4. Install/ add cooling fan or air conditioner to lower the temperature inside the cabinet.

2. Check if there is any obstruction on the heat sink or if the fan is running.
– Remove the obstruction or replace the cooling fan.
– Insufficient ventilation space Increase ventilation space of the drive.

3. Check if the drive matches the corresponding load
– 1. Reduce the load
– 2. Reduce the carrier wave
– 3. Replace the drive with a larger capacity model.

4. The drive has run 100% or more than 100% of the rated output for a long time
– Replace the drive with a larger capacity model.
tH1o
IGBT
temperature
detection
failure		Meaning: IGBT hardware failure in temperature detection- NTC broken or wiring failure.
– When the IGBT temperature is higher than the protection level, and detection time exceeds 100 ms, the tH1o protection activates.

Cause & Solution:

1. Hardware failure Wait for 10 minutes, and then cycle the power.
2. Check if tH1o protection still exists then there is an hardware or software issue in drive. Need to repair or replace drive.
oL
Over load		Meaning: The AC motor drive detects excessive drive output current. When the load is higher than the protection level and exceeds allowable time, the oL protection activates.

Overload capacity:
– Normal duty: Sustains for one minute when the drive outputs 120% of the drive’s rated output current. Sustains for three seconds when the drive outputs 150% of the drive’s rated output current.
– Heavy duty: Sustains for one minute when the drive outputs 150% of the drive’s rated output current. Sustains for three seconds when the drive outputs 200% of the drive’s rated output current.

Cause & Solution:

1. The load is too large
– Reduce the load Accel./Decel. time or the working cycle are too short
– Increase the setting value for Pr.01-12–01-19 (accel./decel. time)

2. V/F voltage is too high
– Adjust the settings for Pr.01-01–01-08 (V/F curve), especially the setting value for the mid-point voltage (if the mid-point voltage is set too low, the load capacity decreases at low speed).
– Refer to the V/F curve selection of Pr.01-43.

3. The capacity of the drive is too small
– Replace the drive with a larger capacity model.

4. Overload during low-speed operation
– Reduce the load during low-speed operation.
– Increase the drive capacity.
– Decrease the carrier frequency of Pr.00-17.

5. Torque compensation is too large
– Adjust the torque compensation (refer to Pr.07-26 Torque Compensation Gain) until the output current reduces and the motor does not stall.

6. Check if the setting for stall prevention is correct.
– Set the stall prevention to the proper value.

7. Output phase loss
– Check the status of three-phase motor.
– Check if the cable is broken or the screws are loose.

8. Improper parameter settings for the speed tracking function (including restart after momentary power loss and restart after fault) Correct the parameter settings for speed tracking.
– 1. Start the speed tracking function.
– 2. Adjust the maximum current for Pr.07-09 speed tracking
EoL1
Electronics
thermal
relay 1
protection		Meaning: Electronics thermal relay 1 protection. The drive coasts to stop once it activates. Start counting when the output current > 150% of the motor 1 rated current.
– Pr.06-14 (If the output current is larger than 105% of the motor 1 rated current again within 60 sec., the counting time reduces and is less than Pr.06-14).

Cause & Solution:


1. The load is too large
– Reduce the load.

2. Accel./Decel. time or the working cycle is too short
– Increase the setting values for Pr.01-12–01-19 (accel./decel. time)

3. V/F voltage is too high
– Adjust the settings for Pr.01-01–01-08 (V/F curve), especially the setting value for the mid-point voltage (if the mid-point voltage is set too low, the load capacity decreases at low speed).

4. Overload during low-speed operation. When using a general motor, even it operates below rated current, an overload may still occur during low-speed operation.
– Decrease low-speed operation time.
– Replace the drive with a dedicated to VFD model.
– Increase the motor capacity.

5. When using VFD dedicated motors, Pr.06-13=0 (electronic thermal relay selection motor 1 = inverter motor)
– Pr.06-13=1 electronic thermal relay selection motor 1 = standard motor (motor with fan on the shaft).

6. Incorrect value of electronic thermal relay
– Reset to the correct motor rated current.

7. The maximum motor frequency is set too low
– Reset to the correct motor rated frequency.

8. One drive to multiple motors
– Set Pr.06-13=2 electronic thermal relay selection motor 1= disable, and install thermal relay on each motor.

9. Check if the setting for stall prevention is correct.
– Set the stall prevention to the proper value.

10. Torque compensation is too large
– Adjust the torque compensation (refer to Pr.07-26 torque compensation gain) until the current reduces and the motor does no stall.

11. Motor fan error Check the status of the fan, or replace the fan. Unbalanced three-phase impedance of the motor
– Replace the motor.
EoL2
Electronic
thermal
relay 2
protection		Meaning: Electronic thermal relay 2 protection. The drive coasts to stop once it activates.
– Start counting when the output current > 150% of the motor 2 rated current.

Cause & Solution:

1. The load is too large
– Reduce the load

2. Accel./Decel. time or the working cycle are too short
– Increase the setting values for Pr.01-12–01-19 (accel./decel. time)

3. V/F voltage is too high
– Adjust the settings for Pr.01-35–01-42 (V/F curve), especially the setting value for the mid-point voltage (if the mid-point voltage is set too low, the load capacity decreases at low speed).

4. Overload during low-speed operation. When using general motor, even it operates below rated current, an overload may still occur during low-speed operation.
– Decrease low-speed operation time.
– Replace the drive with a dedicated to VFD model.
– Increase the motor capacity.

5. Incorrect value of electronic thermal relay
– Reset to the correct motor rated current.

6. The maximum motor frequency is set too low
– Reset to the correct motor rated frequency.

7. One drive to multiple motors
– Set Pr.06-27=2 Electronic thermal relay selection motor 2 = disable, and install thermal relay on each motor.

8. Check if the setting for stall prevention is correct.
– Set the stall prevention to the proper value.

9. Torque compensation is too large
– Adjust the torque compensation (refer to Pr.07-71 torque compensation gain) until the current reduces and the motor does no stall.

10. Motor fan error
– Check the status of the fan, or replace the fan.

11. Unbalanced three-phase impedance of the motor
– Replace the motor.
oH3
Motor
overheating
PTC		Meaning: Motor overheating (PTC) (Pr.03-00–Pr.03-01=6 PTC), when PTC input > Pr.06-30, the fault treatment acts according to Pr.06-29.
– PTC input value > Pr.06-30 setting (Default = 50%).

Fault treatment parameter Pr.06-29
– 0: Warn and continue operation
– 1: Fault and ramp to stop
– 2: Fault and coast to stop
– 3: No warning

Cause & Solution:

1. Motor shaft lock
– Remove the shaft lock.

2. The load is too large
– Reduce the load.
– Increase the motor capacity.

3. Ambient temperature is too high
– Change the installed place if there are heating devices in the surroundings.
– Install/ add cooling fan or air conditioner to lower the ambient temperature.

4. Motor cooling system error
– Check the cooling system to make it work normally

5. Operate at low-speed too long.
– Decrease low-speed operation time.
– Replace the motor with a dedicated to VFD model.
– Increase the motor capacity.

6. Accel./Decel. time and working cycle are too short
– Increase the setting values for Pr.01-12–01-19 (accel./decel. time)

7. Check if the motor rated current matches that on the motor nameplate.
– Reset to the correct motor rated current.

8. Check if the PTC is properly set and wired.
– Check the connection between PTC thermistor and the heat protection.

9. Check if the setting for stall prevention is correct.
– Set the stall prevention to the proper value.

10. Unbalanced three-phase impedance of the motor
– Replace the motor.

11. Harmonics are too high.
– Use remedies to reduce harmonics.
oH3
Motor
overheating
PT100		Meaning: Motor overheating (PT100) (Pr.03-00–Pr.03-01=11 PT100).
– When PT100 input > Pr.06-57 (default = 7 V), the fault treatment acts according to Pr.06-29.
– PT100 input value > Pr.06-57 setting (default = 7 V)

Fault treatment parameter Pr.06-29
– 0: Warn and continue operation
– 1: Fault and ramp to stop
– 2: Fault and coast to stop
– 3: No warning

Cause & Solution:

1. Motor shaft lock
– Remove the shaft lock.

2. The load is too large
– Reduce the load.
– Increase the motor capacity.

3. Ambient temperature is too high
– Change the installed place if there are heating devices in the surroundings.
– Install/ add cooling fan or air conditioner to lower the ambient temperature.

4. Motor cooling system error
– Check the cooling system to make it work normally

5. Operate at low-speed too long.
– Decrease low-speed operation time.
– Replace the motor with a dedicated to VFD model.
– Increase the motor capacity.

6. Accel./Decel. time and working cycle are too short
– Increase the setting values for Pr.01-12–01-19 (accel./decel. time)

7. Check if the motor rated current matches that on the motor nameplate.
– Reset to the correct motor rated current.

8. Check if the PT100 is properly set and wired.
– Check connection of PT100 thermistor.

9. Check if the setting for stall prevention is correct.
– Set the stall prevention to the proper value.

10. Unbalanced three-phase impedance of the motor
– Replace the motor.

11. Harmonics are too high.
– Use remedies to reduce harmonics.
ot1
Over
torque 1		Meaning: When the output current exceeds the over-torque detection level (Pr.06-07) and exceeds over-torque detection time (Pr.06-08), and when Pr.06-06 or Pr.06-09 is set to 2 or 4, the ot1 error displays.

Fault treatment parameter Pr.06-06
– 0: No function
– 1: Continue operation after over-torque detection during constant speed operation
– 2: Stop after over-torque detection during constant speed operation
– 3: Continue operation after over-torque detection during RUN
– 4: Stop after over-torque detection during RUN

Cause & Solution:

1. Incorrect parameter setting
– Configure the settings for Pr.06-07 and Pr.06-08 again.

2. Mechanical failure (e.g. over-torque, mechanical lock)
– Remove the causes of malfunction.

3. The load is too large
– Reduce the load.
– Replace the motor with a larger capacity model.

4. Accel./Decel. time and working cycle are too short
– Increase the setting values for Pr.01-12–Pr.01-19 (accel./decel. time)

5. V/F voltage is too high
– Adjust the V/F curve (Motor 1, Pr.01-01–01-08), especially the setting value for the mid-point voltage (if the mid-point voltage is set too low, the load capacity decreases at low speed).

6. The motor capacity is too small
– Replace the motor with a larger capacity model.

7. Overload during low-speed operation
– Decrease low-speed operation time.
– Increase the motor capacity.

8. Torque compensation is too large
– Adjust the torque compensation (refer to Pr.07-26 torque compensation gain) until the current reduces and the motor does no stall.

9. Improper parameter settings for speed tracking function (including restart after momentary power loss and restart after fault) Correct the parameter settings for speed tracking.
– 1. Start the speed tracking function.
– 2. Adjust the maximum current for Pr.07-09 speed tracking.
ot2
Over
torque 2		Meaning: When the output current exceeds the over-torque detection level (Pr.06-10) and exceeds over-torque detection time (Pr.06-11), and when Pr.06-09 is set to 2 or 4, the ot2 error displays.

Fault treatment parameter Pr.06-09
– 0: No function
– 1: Continue operation after over-torque detection during constant speed operation
– 2: Stop after over-torque detection during constant speed operation
– 3: Continue operation after over-torque detection during RUN
– 4: Stop after over-torque detection during RUN

Cause & Solution:

1. Incorrect parameter setting
– Configure the settings for Pr.06-10 and Pr.06-11 again.

2. Mechanical failure (e.g. over-torque, mechanical lock)
– Remove the causes of malfunction.

3. The load is too large
– Reduce the load.
– Replace the motor with a larger capacity model.

4. Accel./Decel. time and working cycle are too short
– Increase the setting values for Pr.01-12–Pr.01-19 (accel./decel. time)

5. V/F voltage is too high
– Adjust the V/F curve (Motor 1, Pr.01-01–01-08), especially the setting value for the mid-point voltage (if the mid-point voltage is set too low, the load capacity decreases at low speed).

6. The motor capacity is too small
– Replace the motor with a larger capacity model.

7. Overload during low-speed operation
– Decrease low-speed operation time.
– Increase the motor capacity.

8. Torque compensation is too large
– Adjust the torque compensation (refer to Pr.07-71 torque compensation gain) until the current reduces and the motor does no stall.

9. Improper parameter settings for speed tracking function (including restart after momentary power loss and restart after fault) Correct the parameter settings for speed tracking.
– 1. Start the speed tracking function.
– 2. Adjust the maximum current for Pr.07-09 speed tracking.
uC
Under
current		Meaning: Low current detection.

Fault treatment parameter Pr.06-73
– 0: No function
– 1: Fault and coast to stop
– 2: Fault and ramp to stop by the 2nd deceleration time
– 3: Warn and continue operation

Cause & Solution:

1. Motor cable disconnection
– Troubleshoot the connection between the motor and the load.

2. Improper setting of low-current protection
– Reset Pr.06-71, Pr.06-72 and Pr.06-73 to proper settings.

3. The load is too low
– Check the load status.
– Check if the motor capacity matches the load.
cF2
EEPROM read
error		Meaning: Internal EEPROM cannot be read- There is an hardware or software issue in drive. Need to repair or replace drive.

Cause & Solution:

1. Internal EEPROM cannot be read
– Press “RESET” key or reset the parameter to the default setting
– Cycle the power
– After this same fault comes then hardware issue in drive need to repair or replace drive.
cd1
U-phase
error		Meaning: U-phase current detection error when power is ON.

Cause & Solution:

1. Hardware failure
– Cycle the power.

2. Check drive IGBT using multimeter.

3. If fault not reset then there is hardware issue in drive need to repair or replace drive.
cd2
V-phase
error		Meaning: V-phase current detection error when power is ON.

Cause & Solution:

1. Hardware failure
– Cycle the power.

2. Check drive IGBT using multimeter.

3. If fault not reset then there is hardware issue in drive need to repair or replace drive.
cd3
W-phase
error		Meaning: W-phase current detection error when power is ON.

Cause & Solution:

1. Hardware failure
– Cycle the power.

2. Check drive IGBT using multimeter.

3. If fault not reset then there is hardware issue in drive need to repair or replace drive.
Hd0
cc hardware
error		Meaning: cc (current clamp) hardware protection error when power is ON.

Cause & Solution:

1. Hardware failure
– Cycle the power.

2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
Hd1
oc hardware
error		Meaning: oc hardware protection error when power is ON.

Cause & Solution:

1. Hardware failure
– Cycle the power.

2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
AUE
Auto-tuning
error		Meaning: Motor auto-tuning error.

Cause & Solution:

1. Press “STOP” key during auto-tuning
– Re-execute auto-tuning.

2. Incorrect motor capacity (too large or too small) and parameter setting
– Check motor capacity and related parameters.
– Set the correct parameters, that is Pr.01-01–Pr.01-02.
– Set Pr.01-00 larger than the motor rated frequency.

3. Incorrect motor wiring
– Check the wiring.

4. Motor shaft lock
– Remove the cause of motor shaft lock.
AFE
PID loss
ACI		Meaning: PID feedback loss (analog feedback signal is only valid when the PID function is enabled).
– When the analog input < 4 mA (only detects 4–20 mA analog input.

Fault treatment parameter Pr.08-09
– 0: Warn and continue operation
– 1: Fault and ramp to stop
– 2: Fault and coast to stop
– 3: Warn and operate at last frequency

Cause & Solution:

1. PID feedback cable is loose or cut off
– Tighten the terminal.
– Replace the cable with a new one.

2. Feedback device failure
– Replace the device with a new one.

3. Hardware failure
– Check all the wiring.
ACE
ACI loss		Meaning: Analog input loss (including all the 4–20 mA analog signal)
– When the analog input is < 4 mA (only detects 4–20 mA analog input)

Fault treatment parameter Pr.03-19
– 0: Disable
– 1: Continue operation at the last frequency (warning, ANL is displayed on the keypad)
– 2: Decelerate to stop (warning, ANL is displayed on the keypad)
– 3: Stop immediately and display ACE

Cause & Solution:

1. ACI cable is loose or cut off
– Tighten the terminal.
– Replace the cable with a new one.

2. External device failure
– Replace the device with a new one.

3. Hardware failure
– Check all the wiring.
EF
External
fault		Meaning: External fault. This is programmable fault, comes when drive received external signal for external fault.
– When the drive decelerates based on the setting of Pr.07-20, the EF fault displays on the keypad.

Fault treatment parameter Pr.07-20
– 0: Coast to stop
– 1: Stop by the 1 st deceleration time
– 2: Stop by the 2 nd deceleration time
– 3: Stop by the 3 rd deceleration time
– 4: Stop by the 4 th deceleration time
– 5: System deceleration
– 6: Automatic deceleration (Pr.01-46)

Cause & Solution:

1. External fault
– Press RESET key after the fault is cleared.
EF1
Emergency
stop		Meaning: When the contact of MIx=EF1 is ON, the output stops immediately and displays EF1 on the keypad. The motor is in free running.

Cause & Solution:

1. When MIx=EF1 activates
– Verify if the system is back to normal condition, and then press “RESET” key to go back to the default.
bb
External base
block		Meaning: When the contact of MIx=bb is ON, the output stops immediately and displays bb on the keypad. The motor is in free running.

Cause & Solution:

1. When MIx=bb activates
– Verify if the system is back to normal condition, and then press “RESET” key to go back to the default.
Pcod
Password is
locked		Meaning: Entering the wrong password three consecutive times.
– Entering the wrong password three consecutive times.

Cause & Solution:

Incorrect password input through Pr.00-07
1. Input the correct password after rebooting the motor drive.
2. If you forget the password, do the following steps:
Step 1: Input 9999 and press ENTER.
Step 2: Repeat step 1. Input 9999 and press ENTER.
(You need to finish step 1 and step 2 within 10 seconds. If you don’t finish the two steps in 10 seconds, try again.)
3. The parameter settings return to the default when the “Input 9999” process is finished.
CE1
Illegal
command		Meaning: Communication command is illegal.
– When the function code is not 03, 06, 10, or 63.

Cause & Solution:

1. Incorrect communication command from the upper unit
– Check if the communication command is correct.

2. Malfunction caused by interference
– Verify the wiring and grounding of the communication circuit. It is recommended to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance.

3. Different communication setting from the upper unit
– Check if the setting for Pr.09-02 is the same as the setting for the upper unit.

4. Disconnection or bad connection of the cable
– Check the cable and replace it if necessary.
CE2
Illegal data
address		Meaning: Data address is illegal.
– When the data address is incorrect.

Cause & Solution:

1. Incorrect communication command from the upper unit Check if the communication command is correct.

2. Malfunction caused by interference
– Verify the wiring and grounding of the communication circuit. It is recommended to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance.

3. Different communication setting from the upper unit
– Check if the setting for Pr.09-02 is the same as the setting for the upper unit.

4. Disconnection or bad connection of the cable
– Check the cable and replace it if necessary.
CE3
Illegal data
value		Meaning: Data value is illegal.
– When the data length is too long.

Cause & Solution:

1. Incorrect communication command from the upper unit Check if the communication command is correct.

2. Malfunction caused by interference
– Verify the wiring and grounding of the communication circuit. It is recommended to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance.

3. Different communication setting from the upper unit
– Check if the setting for Pr.09-02 is the same as the setting for the upper unit.

4. Disconnection or bad connection of the cable
– Check the cable and replace it if necessary.
CE4
Data is
written to
read-only
address		Meaning: Data is written to read-only address.
– When the data is written to read-only address.

Cause & Solution:

1. Incorrect communication command from the upper unit Check if the communication command is correct.

2. Malfunction caused by interference
– Verify the wiring and grounding of the communication circuit. It is recommended to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance.

3. Different communication setting from the upper unit
– Check if the setting for Pr.09-02 is the same as the setting for the upper unit.

4. Disconnection or bad connection of the cable
– Check the cable and replace it if necessary.
CE10
Modbus
transmission
time-out		Meaning: Modbus transmission time-out occurs.
– When the communication time exceeds the detection time for Pr.09-03 communication time-out.

Fault treatment parameter Pr.09-02
– 0: Warn and continue operation
– 1: Fault and ramp to stop
– 2: Fault and coast to stop
– 3: No warning, no fault, and continue operation

Cause & Solution:

1. The upper unit does not transmit the communication command within Pr.09-03 setting time.
– Check if the upper unit transmits the communication command within the setting time for Pr.09-03.

2. Malfunction caused by interference
– Verify the wiring and grounding of the communication circuit. It is recommended to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance.

3. Different communication setting from the upper unit
– Check if the setting for Pr.09-02 is the same as the setting for the upper unit.

4. Disconnection or bad connection of the cable
– Check the cable and replace it if necessary.
oSL
Over slip
error		Meaning: On the basis of the maximum slip limit set via Pr.10-29, the speed deviation is abnormal. When the motor drive outputs at constant speed, F>H or F
Fault treatment parameter Pr.07-31
– 0: Warn and continue operation
– 1: Fault and ramp to stop
– 2: Fault and coast to stop
– 3: No warning

Cause & Solution:

1. Any of the motor parameters in parameter group 5 may be incorrect
– Check the motor parameters

2. Overload
– Decrease the load

3. Any of the setting value of Pr.07-29, 07-30, and 10-29 is improper
– Check the setting of oSL protection function related parameters
STOMeaning: Safety Torque Off function active.

Cause & Solution:

1. The switch action of S1/+24V and S2/+24V
– Check the wiring of the S1 and S2 terminals.

2. External STO card is installed incorrectly or pin fractures.
– Check if STO card is correctly installed.

3. False trigger
– Reset the emergency switch (ON: activated) and cycle the power.

4. Insufficient external input voltage
– Check that the input voltage maintains at least 11V.

5. Hardware failure
– After you make sure all the wiring is correct
STL1
S1 internal
loop
detection
error		Meaning: S1–DCM internal loop detection error.

Cause & Solution:

1. STO jumper cap is not installed or is off.
– Install the jumper cap.

2. External STO card S1 and +24V short circuit line are not connected.
– Check the wiring of the S1 and +24V terminal.

3. External STO card is installed incorrectly or pin fractures.
– Check if STO card is correctly installed.

4. Insufficient external input voltage
– Check that the input voltage maintains at least 11V.

5. False trigger
– Reset the emergency switch (ON: activated) and cycle the power.

6. Hardware failure
– After you make sure all the wiring is correct, if STL1 fault still exists after cycling the power then there is an hardware issue in drive need to repair or replace drive.
STL2
S2 internal
loop
detection
error		Meaning: S2–DCM internal loop detection error.

Cause & Solution:

1. STO jumper cap is not installed or is off.
– Install the jumper cap.

2. External STO card S1 and +24V short circuit line are not connected.
– Check the wiring of the S1 and +24V terminals.

3. External STO card is installed incorrectly or pin fractures.
– Check if STO card is correctly installed.

4. Insufficient external input voltage
– Check that the input voltage maintains at least 11V.

5. False trigger
– Reset the emergency switch (ON: activated) and cycle the power.

6. Hardware failure
– After you make sure all the wiring is correct, then there is an hardware issue in drive need to repair or replace drive.
STL3
S3 internal
loop
detection
error		Cause: S1–DCM & S2–DCM internal loop detection error.

Soultion:

1. STO jumper cap is not installed or is off.
– Install the jumper cap.

2. Incorrect wiring of STO card
– Check all the wiring of STO card.

3. External STO card is installed incorrectly or pin fractures.
– Check if STO card is correctly installed.

4. False trigger
– Reset the emergency switch (ON: activated) and cycle the power.

5. Hardware failure
– After you make sure all the wiring is correct
Aoc
U-phase
over-current
before run		Meaning: U-phase short circuit detected when the output wiring detection is performed before the drive runs.

Cause & Solution:

1. Incorrect wiring for the motor
– Check if the motor’s internal wiring and the UVW wiring of the drive output terminal are correct.

2. Short-circuit at motor output due to poor insulation wiring
– Check the motor cable and remove causes of the short circuits, or replace the cable before turning on the power.

3. Check for possible burnout or aging insulation of the motor
– Check the motor insulation value with megger. Replace the motor if the insulation is poor.

4. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent interference.

5. The length of motor cable is too long
– Increase the AC motor drive’s capacity.
– Install AC reactor(s) on the output side (U/V/W).

6. Hardware failure
– The Aoc occurs due to the short circuit or ground fault at the output side of the drive. Check for possible short circuits between terminals with the electric meter: B1 corresponds to U, V and W; DC- corresponds to U, V and W; corresponds to U, V and W.
Boc
V-phase
over-current
before run		Meaning: V-phase short circuit detected when the output wiring detection is performed before the drive runs.

Cause & Solution:

1. Incorrect wiring for the motor
– Check if the motor’s internal wiring and the UVW wiring of the drive output terminal are correct.

2. Short-circuit at motor output due to poor insulation wiring
– Check the motor cable and remove causes of the short circuits, or replace the cable before turning on the power.

3. Check for possible burnout or aging insulation of the motor
– Check the motor insulation value with megger. Replace the motor if the insulation is poor.

4. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent interference.

5. The length of motor cable is too long
– Increase the AC motor drive’s capacity.
– Install AC reactor(s) on the output side (U/V/W).

6. Hardware failure
– The Aoc occurs due to the short circuit or ground fault at the output side of the drive. Check for possible short circuits between terminals with the electric meter: B1 corresponds to U, V and W; DC- corresponds to U, V and W; corresponds to U, V and W.
Coc
W-phase
over-current
before run		Meaning: W-phase short circuit detected when the output wiring detection is performed before the drive runs.

Cause & Solution:

1. Incorrect wiring for the motor
– Check if the motor’s internal wiring and the UVW wiring of the drive output terminal are correct.

2. Short-circuit at motor output due to poor insulation wiring
– Check the motor cable and remove causes of the short circuits, or replace the cable before turning on the power.

3. Check for possible burnout or aging insulation of the motor
– Check the motor insulation value with megger. Replace the motor if the insulation is poor.

4. Malfunction caused by interference
– Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent interference.

5. The length of motor cable is too long
– Increase the AC motor drive’s capacity.
– Install AC reactor(s) on the output side (U/V/W).

6. Hardware failure
– The Aoc occurs due to the short circuit or ground fault at the output side of the drive. Check for possible short circuits between terminals with the electric meter: B1 corresponds to U, V and W; DC- corresponds to U, V and W; corresponds to U, V and W.
oPL1
Output phase
loss
U phase		Meaning: U phase output phase loss.

Cause & Solution:

1. Unbalanced three-phase impedance of the motor
– Replace the motor.

2. The motor is wired incorrectly
– Check the cable condition.
– Replace the cable.
– Using a single-phase motor Choose a three-phase motor

3. The current sensor is damaged
– Check the flat cable of the control board. Re-do the wiring and test again if the flat cable is loose.
– Verify that the three-phase current is balanced with a current clamp meter.

4. The drive capacity is much larger than the motor capacity
– Make sure the capacity of the drive and motor match to each other.
oPL2
Output phase
loss
V phase		Meaning: V phase output phase loss.

Cause & Solution:

1. Unbalanced three-phase impedance of the motor
– Replace the motor.

2. The motor is wired incorrectly
– Check the cable condition.
– Replace the cable.
– Using a single-phase motor Choose a three-phase motor

3. The current sensor is damaged
– Check the flat cable of the control board. Re-do the wiring and test again if the flat cable is loose.
– Verify that the three-phase current is balanced with a current clamp meter.

4. The drive capacity is much larger than the motor capacity
– Make sure the capacity of the drive and motor match to each other.
oPL3
Output phase
loss
W phase		Meaning: W phase output phase loss.

Cause & Solution:

1. Unbalanced three-phase impedance of the motor
– Replace the motor.

2. The motor is wired incorrectly
– Check the cable condition.
– Replace the cable.
– Using a single-phase motor Choose a three-phase motor

3. The current sensor is damaged
– Check the flat cable of the control board. Re-do the wiring and test again if the flat cable is loose.
– Verify that the three-phase current is balanced with a current clamp meter.

4. The drive capacity is much larger than the motor capacity
– Make sure the capacity of the drive and motor match to each other.
oL3
Low frequency
overload
protection		Meaning: Low frequency and high current protection.

Cause & Solution:

The drive operates at a frequency below 15 Hz, and output current is too large.
1. Enhance the heat dissipation capacity for the cabinet.
2. Lower the carrier frequency (Pr.00-17).
3. Decrease the voltage settings that correspond to frequency below 15 Hz in the V/F curve.
4. Change Pr.00-11 to general control mode.
5. Replace the drive with a larger power model.
AuE1
Auto-tune
error 1		Meaning: No feedback current error when the motor parameter automatically detects.

Cause & Solution:

1. Motor is not wired
– Wire the motor correctly

2. The electromagnetic contactor is used as an open state on the output side of the drive (U/V/W).
– Check if the electromagnetic valve is closed.
AuE2
Auto-tune
error 2		Meaning: Motor phase loss error when the motor parameter automatically detects

Cause & Solution:

1. Incorrect motor wiring Wire the motor correctly.

2. Motor error Check if the motor works normally.

3. The electromagnetic contactor is used as an open state on the output side of the drive (U/V/W).
– Verify that the three-phases of the electromagnetic valve are all closed.

4. Motor U/V/W wire error
– Check if the wires are broken.
AuE3
Auto-tune
error 3		Meaning: No load current I0 measurement error when the motor parameter automatically detects.

Cause & Solution:

1. Incorrect settings for the motor parameter (rated current)
– Check the settings for Pr.05-01 / Pr.05-13 / Pr.05-34.

2. Motor error
– Check if the motor works normally.
AuE5/AuEs
Total
resistance
measurement
fault		Cause: Fault on measuring total resistance.

Soultion:

1. Motor error
– Check if the motor works normally.
AUE6
No-load
current IO
measurement
fault		Cause: Fault on measuring no-load current IO.

Soultion:

1. Motor error
– Check if the motor works normally.
AUE7
dq axis
inductance
measurement
fault		Cause: Fault on measuring dq axis inductance.

Soultion:

1. Motor error
– Check if the motor works normally.
AUE8
High
frequency
injection
measurement
fault		Cause: Fault on measuring high frequency injection.

Soultion:

1. Motor error
– Check if the motor works normally.
dEv
Pump PID
feedback
error 		Cause: Pump PID feedback error.

Soultion:

1. Unreasonable parameter settings
– Pr.08-14 Time extension
2. Motor error
– Check if the motor works normally.