Fuji FRENIC-Mini Drive

Fuji FRENIC-Mini Drive Fault Codes:

Fault CodeCause & Solution
OC1
Overcurrent
during
acceleration		Cause & Solution:

1. Ground fault or short circuit exists in the output circuit.
– Check whether short-circuit occurs on the motor, the motor cable or contactor.
2. Acceleration time is too short.
– Increase acceleration time.
3. Customized torque boost or V/F curve is not appropriate.
– Adjust the customized torque boost or V/F curve.
4. The voltage is too low.
– Adjust the voltage to normal range.
5. The spinning motor is started.
– Enable the catching a spinning motor function or start the motor after it stops.
6. A load is applied suddenly during acceleration.
– Cancel the suddenly added load.
7. The rated AC drive power is low.
– Replace the drive by one with higher rated power.
8. The braking resistor resistance is small.
– The braking resistor is short circuited.
– Replace a new braking resistor.
OC2
Overcurrent
during
deceleration		Cause & Solution:

1. Ground fault or short circuit exists in the output circuit.
– Check whether short-circuit occurs on motor, motor cable or contactor.

2. Acceleration time is too short.
– Increase acceleration time.

3. The voltage is too low.
– Adjust the voltage to normal range.

4. A load is added suddenly during deceleration.
– Cancel the suddenly added load.

5. Braking unit and braking resistor are not installed.
– Install the braking unit and braking resistor.

6. The braking resistor resistance is small or the braking resistor is short circuited.
– Replace a new braking resistor.
OC3
Overcurrent
at constant
speed		Cause & Solution:

1. Ground fault or short circuit exists in the output circuit.
– Check whether short-circuit occurs on the motor, motor cable or contactor

2. The voltage is too low.
– Adjust the voltage to normal range.

3. A load is added suddenly during running.
– Cancel the suddenly added load.

4. The rated AC drive power is low.
– Replace the drive by one with higher rated power.

5. The braking resistor resistance is small or the braking resistor is short circuited.
– Replace a new braking resistor.
OV1/OU1
Overvoltage
during
acceleration		Cause & Solution:

1. Input voltage is too high.
– Adjust input voltage to normal range.

2. An external force drives motor during acceleration.
– Cancel the external force.

3. Braking unit and braking resistor are not installed.
– Install the braking unit and braking resistor.

4. Acceleration time is too short.
– Increase acceleration time.
OV2/OU2
Overvoltage
during
deceleration		Cause & Solution:

1. Input voltage is too high.
– Adjust input voltage to normal range.

2. An external force drives motor during deceleration.
– Cancel the external force or install the braking resistor.

3. Deceleration time is too short.
– Increase deceleration time.

4. Braking unit and braking resistor are not installed.
– Install the braking unit and braking resistor.
OV3/OU3
Overvoltage
at constant
speed		Cause & Solution:

1. Input voltage is too high.
– Adjust input voltage to normal range.

2. An external force drives motor during running.
– Cancel the external force or install a braking resistor.
LU/LV
Undervoltage		Cause & Solution:

1. An instantaneous power failure occurs.
– Reset the fault

2. The AC drive’s input voltage is not within the permissible range.
– Adjust the voltage to normal range.

3. The bus voltage is abnormal.
– Replace the AC drive.

4. The rectifier bridge, the pre-charge resistor, the drive board or the control board are abnormal.
– Replace the AC drive.
OPL
Output phase
loss		Cause & Solution:

1. Motor winding is damaged. Check resistance between motor cables.
– Replace motor is winding is damaged.

2. The cable connecting the AC drive and the motor is abnormal.
– Check for wiring errors and ensure the output cable is connected properly

3. The AC drive’s three-phase outputs are unbalanced when the motor is running.
– Check whether the motor three-phase winding is normal.

4. The drive board or the IGBT is abnormal.
– Replace the AC drive.
OH1
Overheat
protection
for heat
sink 		Cause & Solution:

1. The ambient temperature is too high.
– Lower the ambient temperature.

2. The ventilation is clogged.
– Clean the ventilation.

3. The fan is damaged.
– Replace the cooling fan.

4. The thermally sensitive resistor of IGBT is damaged.
– Replace the AC drive.

5. The AC drive IGBT is damaged.
– Replace the AC drive.
dbH
Braking
resistor
overheat		Cause: When the built-in or external braking resistor overheats, discharging and the operation of the inverter are stopped.
– It is necessary to set the function code data according to the braking resistor used (built-in or external)

Solution:

1. Verify that the application isn’t exceeding the resistor’s recommended duty cycle or braking time.
2. Look for dust or other debris blocking the resistor’s cooling surfaces.
3. Ensure the resistor was correctly sized for the application’s energy requirements and peak power.
OCn
Overcurrent 		Cause & Solution:

1. Ground fault or short circuit exists in the output circuit.
– Check whether short-circuit occurs on the motor, the motor cable or contactor.
2. Acceleration time is too short.
– Increase acceleration time.
3. Customized torque boost or V/F curve is not appropriate.
– Adjust the customized torque boost or V/F curve.
4. The voltage is too low.
– Adjust the voltage to normal range.
5. The spinning motor is started.
– Enable the catching a spinning motor function or start the motor after it stops.
6. A load is applied suddenly during acceleration.
– Cancel the suddenly added load.
7. The rated AC drive power is low.
– Replace the drive by one with higher rated power.
8. The braking resistor resistance is small.
– The braking resistor is short circuited.
– Replace a new braking resistor.
OUn
Overvoltage 		Cause & Solution:

1. Input voltage is too high.
– Adjust input voltage to normal range.

2. An external force drives motor during acceleration.
– Cancel the external force.

3. Braking unit and braking resistor are not installed.
– Install the braking unit and braking resistor.

4. Acceleration time is too short.
– Increase acceleration time.
Lin
Input phase
loss		Cause & Solution:

1. Three phase input is abnormal.
– Eliminate faults in external circuitry

2. Drive board is abnormal.
– Eliminate faults in external circuitry

3. Lightning protection board is abnormal.
– There is an hardware or software issue in drive. Need to repair or replace drive.


4. Control board is abnormal.
– There is an hardware or software issue in drive. Need to repair or replace drive.
OH2
External
alarm input		Cause: External alarm was inputted (THR).

Solution:

1. An alarm function of the external equipment was activated.
– Inspect external equipment operation.
– Remove the cause of the alarm that occurred.

2. Connection has been performed incorrectly.
– Check if the wire for the external alarm signal is correctly connected to the terminal to which the “Alarm from external equipment” has been assigned.
– Connect the wire for the alarm signal correctly.

3. Incorrect settings.
– Check if the “Alarm from external equipment” has not been assigned to an unassigned terminal.
– Correct the assignment.
OH4
Motor
overheat
(PTC/NTC
thermistor)		Cause: Temperature of the motor has risen abnormally.

Solution:

1. The temperature around the motor exceeded the range of the motor specification.
– Measure the temperature around the motor.

2. Cooling system for the motor defective.
– Check if the cooling system of the motor is operating normally.

3. The activation level of the PTC thermistor for motor overheat protection was set inadequately.
– Check the PTC thermistor specifications and recalculate the detection voltage.

4. Settings for the PTC/NTC thermistor are improper.
– Check the setting of the thermistor mode selection.
dbh
Braking
resistor
overheated		Cause: Problem The electronic thermal protection for the braking resistor has been activated.

Solution:

1. Braking load is too heavy. Reconsider the relationship between the estimated braking load and the real one.
– Lower the real braking load.
– Review the selection of the braking resistor and increase the braking capability (Modification of related function code data is also required.)

2. Specified deceleration time is too short. Recalculate the deceleration torque and time needed for the load currently applied, based on a moment of inertia for the load and the deceleration time.
– Increase the deceleration time.
– Review the selection of the braking resistor and increase the braking capability. (Modification of related function code data is also required.)

3. Incorrect setting of function code data. Recheck the specifications of the braking resistor.
– Review data of function codes & then modify them
OL1
Electronic
thermal
overload
relay		Cause: Electronic thermal function for motor overload detection was activated.

Solution:

1. Load was too heavy. Measure the output current.
– Lighten the load (e.g., lighten the load before overload occurs using the overload early warning (E34)).

2. The acceleration/ deceleration time was too short.
– Check that the motor generates enough torque for acceleration/deceleration. This torque is calculated from the moment of inertia for the load and the acceleration/ deceleration time.
– Increase the acceleration/ deceleration time (F07, F08, E10, E11 and H54).

3. The characteristics of electronic thermal did not match those of the motor overload.
Check the motor characteristics.
– Reconsider the data of function codes P99, F10 and F12.
– Use an external thermal relay.

4. Activation level for the electronic thermal relay was inadequate.
– Check the continuous allowable current of the motor.
– Reconsider and change the data of function code F11.
OLU
Overload
protection		Cause & Solution:

1. The load is too heavy or locked-rotor occurs on the motor.
– Reduce the load or check motor and mechanical conditions.

2. The rated AC drive power is low.
– Replace the drive by one with higher rated power.
Er1
Memory error		Cause: Error occurred in writing the data to the memory in the inverter.

Solution:

1. While the inverter was writing data (especially initializing data), power supply was turned off and the voltage for the control circuit dropped.
– Check if pressing the PGR/RESET key resets the alarm after the function code data are initialized by setting the data of H03 to 1
– Return the initialized function code data to their previous settings, then restart the operation.

2. A high intensity noise was given to the inverter while data (especially initializing data) was being written.
– Check if appropriate noise control measures have been implemented (e.g., correct grounding and routing of control and main circuit wires).
– Improve noise control. Alternatively, return the initialized function code data to their previous settings, then restart the operation.

3. The control circuit failed.
– Initialize the function code data by setting H03 to 1, then reset the alarm by pressing the PGR/RESET key and check that the alarm goes on.
– This problem was caused by a problem of the printed circuit board (PCB) (on which the CPU is mounted).
Er2
Remote keypad
communications
error		Cause: A communications error occurred between the remote keypad and the inverter.

Solution:

1. Break in the communications cable or poor contact.
– Check continuity of the cable, contacts and connections.
– Replace the cable.

2. A high intensity noise was given to the inverter.
– Check if appropriate noise control measures have been implemented (e.g., correct grounding and routing of control and main circuit wires).
– Improve noise control. For details, refer to “Appendix A” of the FRENIC-Mini User’s Manual (MEH446).

3. The remote keypad malfunctioned.
– Check that alarm er2 does not occur if you connect another remote keypad to the inverter.
– Replace the remote keypad.

4. The RS-485 communications card malfunctioned.
– Check that alarm er2 occurs even if you connect another remote keypad to the inverter.
– Replace the card.
Er3
CPU error		Cause: A CPU error (e.g. erratic CPU operation) occurred.

Solution:

1. A high intensity noise was given to the inverter.
– Check if appropriate noise control measures have been implemented (e.g. correct grounding and routing of control and main circuit wires).
– Improve noise control.
Er6
Operation
protection		Cause: An error occurred due to incorrect operation of the motor.

Solution:

1. The STOP key was pressed when H96 = 1 or 3. Even though a run command was present at the input terminal or the communication port, the inverter was forced to decelerate to stop and er6 was displayed.
– If this was not intended, check the setting of H96.

2. The start check function was activated when H96 = 2 or 3. When one of the following conditions occurred while a run command was present at the input, the inverter did not run and er6 was displayed:
– The power was switched on
– An alarm was released
– The inverter was switched to link command LE operation.

Review the running sequence to avoid input of the run command when er6 has occurred. If this was not intended, check the setting of H96. (To reset the alarm, turn the run command off.)
Er8
RS-485
communications
error		Cause: A communications error occurred during RS-485 communications.

Solution:

1. Host controllers (e.g., PLCs and personal computers) did not operate due to incorrect settings and/or defective software/hardware.
– Check the controllers.
– Remove the cause of the controller error.

2. RS-485 converter did not operate due to incorrect connections and settings, or hardware defective.
– Check the RS-485 converter (e.g., check for poor contact).
– Change the various RS-485 converter settings, reconnect the wires, or replace the converter with a recommended device as appropriate.

3. Broken communications cable or poor contact.
– Check continuity of the cable, contacts and connections.
– Replace the cable.

4. Even though no response error detection time (y08) has been set, communications did not occur cyclically.
– Check the host controllers.
– Change the settings of host controller software, or make the no response error detection time invalid (y08=0).

5. A high intensity noise was given to the inverter.
– Check if appropriate noise control measures have been implemented (e.g., correct grounding and routing of control and main circuit wires).
– Improve noise control.
– Improve noise reduction measures on the host side.
– Replace the relay converter with a recommended insulated converter.
ErF
Data save
error during
undervoltage		Cause: The inverter was unable to save data such as the frequency commands, timer operation time, and PID process command set through the keypad when the power was switched off.

Solution:

1. The control circuit voltage dropped suddenly while data was being saved when the power was turned off, because the DC link bus was rapidly discharged.
– Check how long it takes for the DC link bus voltage to drop to the preset voltage when power is turned off.
– Remove whatever is causing the rapid discharge of the DC link circuit. After pressing the PGR/RESET key and releasing the alarm, set, using a remote keypad, the data of the relevant function codes (such as the frequency commands, timer operation time, and PID process command) back to the original values and then restart the operation.

2. A high intensity noise affected the operation of the inverter while data was being saved when the power was turned off.
– Check if appropriate noise control measures have been implemented (e.g., correct grounding and routing of control and main circuit wires).
– Improve noise control. After pressing the PGR/RESET key and releasing the alarm, set, using a remote keypad, the data of the relevant function codes (such as the frequency commands, timer operation time, and PID process command) back to the original values and then restart the operation.

3. The control circuit failed. Check if erf occurs each time power is switched off.
– This problem was caused by a problem of the printed circuit board (PCB) (on which the CPU is mounted).