Yaskawa A1000 Fault codes 3
LF (Output Phase Loss):
- Cause: Phase loss on the output side of the drive.
+ Possible Solution: Check and properly connect the output cable, check the motor winding resistance and replace the motor if damaged, apply the specified tightening torque to fasten the output terminals, ensure the motor's rated current is appropriate for the drive, and replace the control board or the entire drive if an output transistor is damaged. Note that the drive cannot operate a single-phase motor.
LF2 (Output Current Imbalance):
- Cause: One or more phases in the output current are lost.
+ Possible Solution: Check for faulty wiring or poor connections on the output side of the drive, apply the specified tightening torque to fasten the terminals, replace the control board or the entire drive if the output circuit is damaged, and ensure motor impedance or motor phases are even.
LF3 (Power Unit Output Phase Loss 3):
- Cause: Phase loss occurred on the output side.
+ Possible Solution: Cycle the power supply, replace the gate drive board or the entire drive if the fault continues, check and correct any wiring mistakes in the cable to the current detection circuit, and ensure the cable between the output reactor and the power unit is properly connected.
nSE (Node Setup Error):
- Cause: A terminal assigned to the node setup function closed during run.
+ Possible Solution: Stop the drive when using the node setup function, and ensure that no Run command is issued while the node setup function is active.
oC (Overcurrent):
- Cause: Drive sensors detected an output current greater than the specified overcurrent level.
+ Possible Solution: Check the insulation resistance and replace the motor if damaged, check and replace motor cables if shorted out, measure the current flowing into the motor and replace the drive with a larger capacity if necessary, increase acceleration/deceleration times, check motor capacity, set up the operation sequence to prevent the magnetic contactor (MC) from tripping, check V/f settings, reduce torque compensation gain, review solutions for handling noise interference, reduce overexcitation gain, enable Speed Search at Start, enter the correct motor code for OLV/PM, and check the control mode and motor match.
oFA00 to oFA43, oFb00 to oFb17, oFC00 to oFC02 (Option Card Errors):
- Cause: Option card compatibility error, option card not properly connected, same type of option card currently connected, or option card or hardware is damaged.
+ Possible Solution: Confirm that the drive supports the option card, ensure the option card is properly plugged into the option port and fixed properly, try using the card in a different option port, cycle power to the drive, and replace the control board or the entire drive if the problem continues. For PG option cards, connect them to the correct option ports (CN5-B or CN5-C). Make sure only one type of option card is connected, and a maximum of two PG option boards can be used simultaneously.
oFC03 to oFC17 (Option Card Error Occurred at Option Port CN5-C):
- Cause: Option card or hardware is damaged.
+ Possible Solution: Cycle power to the drive. If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa representative for instructions on replacing the control board.
oH (Heatsink Overheat):
- Cause: The heatsink temperature exceeded the overheat pre-alarm level set to L8-02.
+ Possible Solution: Check the temperature surrounding the drive and ensure it's within drive specifications. Improve air circulation within the enclosure panel, install a fan or air conditioner to cool the surrounding area, remove any heat-producing objects near the drive, measure the output current and decrease the load if necessary, lower the carrier frequency (C6-02), replace the cooling fan if it's stopped, and reset the cooling fan maintenance with parameter o4-03.
oH1 (Overheat 1 - Heatsink Overheat):
- Cause: The heatsink temperature exceeded the drive overheat level, determined by drive capacity (o2-04).
+ Possible Solution: Similar to the solutions for oH, including checking the surrounding temperature, improving air circulation, installing cooling equipment, reducing the load, and lowering the carrier frequency (C6-02).
oH3 (Motor Overheat Alarm - PTC Input):
- Cause: The motor overheat signal to analog input terminal A1, A2, or A3 exceeded the alarm detection level.
+ Possible Solution: Check the size of the load, acceleration/deceleration times, and cycle times. Decrease the load, increase acceleration/deceleration times, adjust the V/f pattern, ensure the motor cooling system is operating normally, and repair or replace it if necessary.
oH4 (Motor Overheat Fault - PTC Input):
- Cause: The motor overheat signal to analog input terminal A1, A2, or A3 exceeded the fault detection level.
+ Possible Solution: Similar to the solutions for oH3, including checking the load size, adjusting acceleration/deceleration times, adjusting the V/f pattern, and ensuring the motor cooling system is operating normally.
oH5 (Motor Overheat - NTC Input):
- Cause: The motor temperature exceeded the level set to L1-16 (or L1-18 for motor 2).
+ Possible Solution: Reduce the load and check the ambient temperature.
oL1 (Motor Overload):
- Cause: The electronic motor overload protection tripped.
+ Possible Solution: Reduce the load, increase acceleration/deceleration times, adjust the V/f pattern, check and enter the correct motor rated current, set the correct maximum output frequency, install a thermal relay for each motor if multiple motors are running off the same drive, correct the type of motor protection selected, check the electrical thermal relay setting, reduce overexcitation operation, adjust Speed Search parameters, and check the power supply for phase loss.
oL2 (Drive Overload):
- Cause: The thermal sensor of the drive triggered overload protection.
+ Possible Solution: Reduce the load, increase acceleration/deceleration times, adjust the V/f pattern, replace the drive with a larger model if the capacity is too small, reduce the load when operating at low speeds, lower the carrier frequency, reduce torque compensation, check and adjust Speed Search parameters, and check the power supply for phase loss.
oL3 (Overtorque Detection 1):
- Cause: The current has exceeded the value set for torque detection (L6-02) for longer than the allowable time (L6-03).
+ Possible Solution: Check L6-02 and L6-03 settings, and check the status of the load to remove the cause of the fault if there is a fault on the machine side.
oL4 (Overtorque Detection 2):
- Cause: The current has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowable time (L6-06).
+ Possible Solution: Check the settings of parameters L6-05 and L6-06, and ensure they are appropriate for the load.
Yaskawa A1000 VFD faults related to mechanical weakening, high slip braking, external digital operator connection, and overspeed:
oL5 (Mechanical Weakening Detection 1):
- Cause: Overtorque occurred, matching the conditions specified in L6-08.
+ Possible Solution: Identify the cause of mechanical weakening.
oL7 (High Slip Braking oL):
- Cause: The output frequency stayed constant for longer than the time set to n3-04 during High Slip Braking.
+ Possible Solution: Reduce deceleration times for applications not using High Slip Braking, use a braking resistor to shorten deceleration time, ensure nothing on the load side is restricting deceleration, increase parameter n3-04 (High-slip Braking Overload Time), and install a thermal relay and increase the setting of n3-04 to the maximum value.
- Cause: Phase loss on the output side of the drive.
+ Possible Solution: Check and properly connect the output cable, check the motor winding resistance and replace the motor if damaged, apply the specified tightening torque to fasten the output terminals, ensure the motor's rated current is appropriate for the drive, and replace the control board or the entire drive if an output transistor is damaged. Note that the drive cannot operate a single-phase motor.
LF2 (Output Current Imbalance):
- Cause: One or more phases in the output current are lost.
+ Possible Solution: Check for faulty wiring or poor connections on the output side of the drive, apply the specified tightening torque to fasten the terminals, replace the control board or the entire drive if the output circuit is damaged, and ensure motor impedance or motor phases are even.
LF3 (Power Unit Output Phase Loss 3):
- Cause: Phase loss occurred on the output side.
+ Possible Solution: Cycle the power supply, replace the gate drive board or the entire drive if the fault continues, check and correct any wiring mistakes in the cable to the current detection circuit, and ensure the cable between the output reactor and the power unit is properly connected.
nSE (Node Setup Error):
- Cause: A terminal assigned to the node setup function closed during run.
+ Possible Solution: Stop the drive when using the node setup function, and ensure that no Run command is issued while the node setup function is active.
oC (Overcurrent):
- Cause: Drive sensors detected an output current greater than the specified overcurrent level.
+ Possible Solution: Check the insulation resistance and replace the motor if damaged, check and replace motor cables if shorted out, measure the current flowing into the motor and replace the drive with a larger capacity if necessary, increase acceleration/deceleration times, check motor capacity, set up the operation sequence to prevent the magnetic contactor (MC) from tripping, check V/f settings, reduce torque compensation gain, review solutions for handling noise interference, reduce overexcitation gain, enable Speed Search at Start, enter the correct motor code for OLV/PM, and check the control mode and motor match.
oFA00 to oFA43, oFb00 to oFb17, oFC00 to oFC02 (Option Card Errors):
- Cause: Option card compatibility error, option card not properly connected, same type of option card currently connected, or option card or hardware is damaged.
+ Possible Solution: Confirm that the drive supports the option card, ensure the option card is properly plugged into the option port and fixed properly, try using the card in a different option port, cycle power to the drive, and replace the control board or the entire drive if the problem continues. For PG option cards, connect them to the correct option ports (CN5-B or CN5-C). Make sure only one type of option card is connected, and a maximum of two PG option boards can be used simultaneously.
oFC03 to oFC17 (Option Card Error Occurred at Option Port CN5-C):
- Cause: Option card or hardware is damaged.
+ Possible Solution: Cycle power to the drive. If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa representative for instructions on replacing the control board.
oH (Heatsink Overheat):
- Cause: The heatsink temperature exceeded the overheat pre-alarm level set to L8-02.
+ Possible Solution: Check the temperature surrounding the drive and ensure it's within drive specifications. Improve air circulation within the enclosure panel, install a fan or air conditioner to cool the surrounding area, remove any heat-producing objects near the drive, measure the output current and decrease the load if necessary, lower the carrier frequency (C6-02), replace the cooling fan if it's stopped, and reset the cooling fan maintenance with parameter o4-03.
oH1 (Overheat 1 - Heatsink Overheat):
- Cause: The heatsink temperature exceeded the drive overheat level, determined by drive capacity (o2-04).
+ Possible Solution: Similar to the solutions for oH, including checking the surrounding temperature, improving air circulation, installing cooling equipment, reducing the load, and lowering the carrier frequency (C6-02).
oH3 (Motor Overheat Alarm - PTC Input):
- Cause: The motor overheat signal to analog input terminal A1, A2, or A3 exceeded the alarm detection level.
+ Possible Solution: Check the size of the load, acceleration/deceleration times, and cycle times. Decrease the load, increase acceleration/deceleration times, adjust the V/f pattern, ensure the motor cooling system is operating normally, and repair or replace it if necessary.
oH4 (Motor Overheat Fault - PTC Input):
- Cause: The motor overheat signal to analog input terminal A1, A2, or A3 exceeded the fault detection level.
+ Possible Solution: Similar to the solutions for oH3, including checking the load size, adjusting acceleration/deceleration times, adjusting the V/f pattern, and ensuring the motor cooling system is operating normally.
oH5 (Motor Overheat - NTC Input):
- Cause: The motor temperature exceeded the level set to L1-16 (or L1-18 for motor 2).
+ Possible Solution: Reduce the load and check the ambient temperature.
oL1 (Motor Overload):
- Cause: The electronic motor overload protection tripped.
+ Possible Solution: Reduce the load, increase acceleration/deceleration times, adjust the V/f pattern, check and enter the correct motor rated current, set the correct maximum output frequency, install a thermal relay for each motor if multiple motors are running off the same drive, correct the type of motor protection selected, check the electrical thermal relay setting, reduce overexcitation operation, adjust Speed Search parameters, and check the power supply for phase loss.
oL2 (Drive Overload):
- Cause: The thermal sensor of the drive triggered overload protection.
+ Possible Solution: Reduce the load, increase acceleration/deceleration times, adjust the V/f pattern, replace the drive with a larger model if the capacity is too small, reduce the load when operating at low speeds, lower the carrier frequency, reduce torque compensation, check and adjust Speed Search parameters, and check the power supply for phase loss.
oL3 (Overtorque Detection 1):
- Cause: The current has exceeded the value set for torque detection (L6-02) for longer than the allowable time (L6-03).
+ Possible Solution: Check L6-02 and L6-03 settings, and check the status of the load to remove the cause of the fault if there is a fault on the machine side.
oL4 (Overtorque Detection 2):
- Cause: The current has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowable time (L6-06).
+ Possible Solution: Check the settings of parameters L6-05 and L6-06, and ensure they are appropriate for the load.
Yaskawa A1000 VFD faults related to mechanical weakening, high slip braking, external digital operator connection, and overspeed:
oL5 (Mechanical Weakening Detection 1):
- Cause: Overtorque occurred, matching the conditions specified in L6-08.
+ Possible Solution: Identify the cause of mechanical weakening.
oL7 (High Slip Braking oL):
- Cause: The output frequency stayed constant for longer than the time set to n3-04 during High Slip Braking.
+ Possible Solution: Reduce deceleration times for applications not using High Slip Braking, use a braking resistor to shorten deceleration time, ensure nothing on the load side is restricting deceleration, increase parameter n3-04 (High-slip Braking Overload Time), and install a thermal relay and increase the setting of n3-04 to the maximum value.
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