Yaskawa Sigma 5 Servo Drive

Yaskawa Sigma 5 Servo Drive Fault Codes:

Fault Code and MeaningCause and Remedy
A.020
Parameter Checksum Error 1
(The parameter data in the SERVOPACK is incorrect)
Cause: The power supply voltage suddenly dropped.

Remedy:

  • Measure the power supply voltage.

  • Set the power supply voltage within the specified range.

  • Set Fn005 to initialize the parameter.




Cause: The power supply went OFF while changing a parameter setting.

Remedy:

  • Check the circumstances when the power supply went OFF.

  • Set Fn005 to initialize the parameter and then set the parameter again.




Cause: The number of times that parameters were written exceeded the limit.

Remedy:

  • Check to see if the parameters were frequently changed through the host controller.

  • The SERVOPACK may be faulty. Replace the SERVOPACK.

  • Reconsider the method of writing parameters.




Cause: Malfunction caused by noise from the AC power supply or grounding line, static electricity noise, etc.

Remedy:

  • Turn the power supply to the SERVOPACK OFF and ON again. If the alarm still occurs, the cause may be noise.

  • Take countermeasures against noise.




Cause: Gas, water drops, or cutting oil entered the SERVOPACK and caused failure of the internal components.

Remedy:

  • Check the installation conditions.

  • The SERVOPACK may be faulty. Replace the SERVOPACK.
A.021
Parameter Format Error 1
(The parameter data in the SERVOPACK is incorrect)
Cause: The software version of SERVOPACK that caused the alarm is older than that of the written parameter.

Remedy:

  • Check Fn012 to see if the set software version agrees with that of the SERVOPACK.

  • Write the parameter of another SERVOPACK of the same model with the same software version. Then turn the power OFF and then ON again.




Cause: A SERVOPACK fault occurred.

Remedy:

  • The SERVOPACK may be faulty. Replace the SERVOPACK.
A.022
System Checksum Error 1
(The parameter data in the SERVOPACK is incorrect)
Cause: The power supply voltage suddenly dropped.

Remedy:

  • Measure the power supply voltage.

  • The SERVOPACK may be faulty. Replace the SERVOPACK.




Cause: The power supply went OFF while setting an utility function.

Remedy:

  • Check the circumstances when the power supply went OFF.

  • The SERVOPACK may be faulty. Replace the SERVOPACK.




Cause: A SERVOPACK fault occurred.

Remedy:

  • Turn the power supply to the SERVOPACK OFF and ON again.

  • If the alarm still occurs, the SERVOPACK may be faulty. Replace the SERVOPACK.
A.030
Main Circuit Detector Error
Cause: A SERVOPACK fault occurred.

Remedy:

  • The SERVOPACK may be faulty. Replace the SERVOPACK.
A.040
Parameter Setting Error 1
(The parameter setting was out of the setting range)
Cause: The SERVOPACK and servomotor capacities do not match each other.

Remedy:

  • Check the combination of SERVOPACK and servomotor capacities.

  • Select the proper combination of SERVOPACK and servomotor capacities.




Cause: The parameter setting is out of the setting range.

Remedy:

  • Check the setting ranges of the parameters that have been changed.

  • Set the parameter to a value within the setting range.




Cause: The electronic gear ratio is out of the setting range.

Remedy:

  • Check the electronic gear ratio. The ratio must satisfy: 0.001 < (Pn20E/Pn210) < 4000.

  • Set the electronic gear ratio within the valid range.
A.041
Encoder Output Pulse Setting Error
Cause: The encoder output resolution (Pn281) is out of the setting range and does not satisfy the setting conditions.

Remedy:

  • Check the parameter Pn281.

  • Set Pn281 to a correct value.
A.042
Parameter Combination Error
Cause: The speed of program JOG operation (Fn004) is lower than the setting range after having changed the electronic gear ratio.

Remedy:

  • Check if the detection conditions are satisfied.

  • Decrease the setting of the electronic gear ratio (Pn20E/Pn210).




Cause: The speed of program JOG operation (Fn004) is lower than the setting range after having changed the program JOG movement speed (Pn585).

Remedy:

  • Increase the setting of the program JOG movement speed (Pn585).
A.04A
Parameter Setting Error 2
Cause: A parameter reserved by the system was changed.

Remedy:

  • Check the set values of reserved parameters.

  • Change the set values of reserved parameters to the factory settings.
A.050
Combination Error
(SERVOPACK and servomotor capacities do not correspond)
Cause: The SERVOPACK and servomotor capacities do not match each other.

Remedy:

  • Select the proper combination of SERVOPACK and servomotor capacities.




Cause: A linear scale fault occurred.

Remedy:

  • Replace the linear scale and see if the alarm occurs again.

  • Replace the linear scale permanently if faulty.
A.051
Unsupported Device Alarm
Cause: The parameters of the motor parameter file are not written in the linear scale.

Remedy:

  • Check if the parameters of the motor parameter file are written in the linear scale.

  • Write the parameters of the motor parameter file in the linear scale.




Cause: An unsupported serial converter unit or linear scale is connected to the SERVOPACK.

Remedy:

  • Check the product specifications and select the correct model.

  • Select the correct combination of units.
A.080
Linear Scale Pitch Setting Error
Cause: The setting of the linear scale pitch (Pn282) has not been changed from the default setting.

Remedy:

  • Check the value of Pn282.

  • Correct the value of Pn282.
A.0b0
Canceled Servo ON Command Alarm
Cause: After executing the utility function to turn ON the power to the motor, the servo ON command was input from the host controller.

Remedy:

  • Turn the SERVOPACK power supply OFF and then ON again or execute a software reset.
A.100
Overcurrent or Heat Sink Overheated
(IGBT or Heat Sink issue)
Cause: Incorrect wiring or contact fault of main circuit cables.

Remedy:

  • Check the wiring (Refer to Main Circuit Wiring details).

  • Correct the wiring.




Cause: Short-circuit or ground fault of main circuit cables, inside the servomotor, or inside the SERVOPACK.

Remedy:

  • Check for short-circuits across the servomotor terminal phases U, V, and W.

  • Check for shorts between grounding and terminals.

  • Replace the cable, the servomotor, or the SERVOPACK depending on where the short is found.




Cause: The dynamic brake was frequently activated, or the DB overload alarm occurred.

Remedy:

  • Check the power consumed by DB resistance (Un00B).

  • Change the SERVOPACK model, operating conditions, or mechanism so the DB is not used as frequently.




Cause: The generated regenerative resistor value exceeded the SERVOPACK capacity.

Remedy:

  • Check the regenerative load ratio (Un00A).

  • Check operating conditions including overload.

  • Change the regenerative resistance value to a value larger than the minimum allowable value.




Cause: Malfunction caused by noise interference.

Remedy:

  • Improve wiring and installation environment.

  • Take countermeasures for noise (correct wiring of FG, etc.).
A.300
Regeneration Error
Cause: The regenerative resistor capacity (Pn600) is set incorrectly, or connections are missing.

Remedy:

  • Check the external regenerative resistor connection and Pn600 value.

  • Connect the external regenerative resistor, or set Pn600 to 0 if not required.




Cause: The lead wire between B2 and B3 terminals was removed (and no external resistor used).

Remedy:

  • Check the wiring of the lead wire between B2 and B3.

  • Wire the B2 and B3 terminals with a lead wire.




Cause: The External Regenerative Resistor is not wired correctly.

Remedy:

  • Correct the wiring of the External Regenerative Resistor.

  • Note: The SERVOPACK will fail if the external resistor is connected while the B2-B3 wire is still in place.
A.320
Regenerative Overload
Cause: The power supply voltage exceeds the specified limit.

Remedy:

  • Measure the power supply voltage.

  • Set the power supply voltage within the specified range.




Cause: Insufficient external regenerative resistance or capacity.

Remedy:

  • Check operating conditions using capacity selection software.

  • Change the regenerative resistance, capacity, or SERVOPACK capacity.




Cause: Regenerative power continuously flowed back because negative load was continuously applied.

Remedy:

  • Check the load applied to the servomotor during operation.

  • Reconsider the system including servo, machine, and operating conditions.
A.330
Main Circuit Power Supply Wiring Error
Cause: The regenerative resistor disconnected when the SERVOPACK power supply voltage was high.

Remedy:

  • Measure the resistance of the regenerative resistor.

  • Replace the SERVOPACK (if built-in) or the external regenerative resistor.




Cause: AC power supplied in DC input mode, or vice versa.

Remedy:

  • Check the power supply specifications.

  • Correct the settings to match the actual power supply specifications.
A.400
Overvoltage
(Detected in main circuit power supply)
Cause:
The power supply voltage exceeded the allowable range; The power supply is unstable or influenced by lightning; Regenerative energy is too high; SERVOPACK fault.



Remedy:

  • Measure the power supply voltage and set it within the specified range (145V for 100V class, 290V for 200V class, 580V for 400V class).

  • Install a surge absorber to improve power supply conditions. Turn power OFF and ON again.

  • Check the operation conditions. Select a regenerative resistance value appropriate for the load.

  • Increase the deceleration time or reduce the load (mass ratio).

  • If alarm persists after cycling power, replace the SERVOPACK.
A.410
Undervoltage
(Detected in main circuit power supply)
Cause:
The AC power supply voltage is too low; Voltage dropped during operation; Instantaneous power interruption; Fuse blown; SERVOPACK fault.



Remedy:

  • Measure power supply voltage and set within specified range.

  • Increase the power supply capacity.

  • If Pn509 (instantaneous power cut hold time) is set, decrease the setting.

  • Replace the SERVOPACK, connect a reactor, and run the system.

  • If the alarm persists, replace the SERVOPACK.
A.450
Main-Circuit Capacitor Overvoltage
Cause:
A SERVOPACK fault occurred.



Remedy:

  • Replace the SERVOPACK.
A.510
Overspeed
Cause:
Incorrect phase order (U, V, W) in wiring; Reference value exceeded limit; Input gain too high; SERVOPACK fault.



Remedy:

  • Check motor wiring and confirm phases are correct.

  • Reduce the reference value or adjust the gain.

  • Reduce the speed reference input gain or adjust the servo gain.

  • Reconsider operating conditions.

  • Replace the SERVOPACK.
A.511
Overspeed of Encoder Output Pulse Rate
Cause:
The encoder output pulse frequency exceeded the limit; Motor speed too high.



Remedy:

  • Decrease the setting of the encoder output resolution (Pn281).

  • Decrease the motor speed.
A.520
Vibration Alarm
Cause:
Abnormal vibration detected; Mass ratio (Pn103) is incorrect.



Remedy:

  • Reduce motor speed or reduce the speed loop gain (Pn100).

  • Check for abnormal noise from the servomotor.

  • Set the mass ratio (Pn103) to an appropriate value.
A.521
Autotuning Alarm
Cause:
Vibration detected while executing one-parameter tuning, EasyFFT, or tuning-less function.



Remedy:

  • Reduce the load so the mass ratio falls within allowable value.

  • Raise the load level using tuning-less levels setting (Fn200).

  • Reduce rigidity level.

  • Check the operation procedure and take corrective action.
A.550
Maximum Speed Setting Error
Cause:
The Pn385 setting is greater than the maximum speed.



Remedy:

  • Set Pn385 to a value equal to or lower than the motor maximum speed.

  • Check value of Un010 (Monitor for allowable motor maximum speed).
A.710
Overload (High Load)

A.720
Overload (Low Load)
Cause:
Incorrect wiring; Mechanical problems creating excessive load; Incorrect linear scale pitch (Pn282); Incorrect motor phase selection (Pn080.1); SERVOPACK fault.



Remedy:

  • Confirm servomotor and linear scale are correctly wired.

  • Reconsider load/operating conditions or increase motor capacity.

  • Remove mechanical problems impeding motion.

  • Correct the setting of Pn282 (linear scale pitch).

  • Correct the setting of Pn080.1 (motor phase selection).

  • Replace the SERVOPACK.
A.730
A.731
Dynamic Brake Overload
Cause:
External force moving the motor; Moving energy at DB stop exceeds capacity.



Remedy:

  • Take measures to ensure external force does not move the motor.

  • Reduce the motor reference speed.

  • Reduce the mass ratio.

  • Reduce the number of times of the DB stop operation.

  • Replace the SERVOPACK if fault persists.
A.740
Overload of Surge Current Limit Resistor
Cause:
Main circuit power turned ON/OFF too frequently.



Remedy:

  • Reduce the frequency of turning the main circuit power supply ON/OFF.

  • If alarm persists, replace the SERVOPACK.
A.7A0
Heat Sink Overheated
Cause:
Ambient temperature too high; Excessive load; Incorrect installation orientation or insufficient space.



Remedy:

  • Improve installation conditions to decrease surrounding air temperature.

  • Reconsider the load and operating conditions.

  • Install the SERVOPACK correctly as specified with proper spacing.

  • Replace the SERVOPACK if faulty.
A.7Ab
Built-in Fan in SERVOPACK Stopped
Cause:
The fan inside the SERVOPACK stopped due to debris or failure.



Remedy:

  • Check for and remove foreign matter or debris from the SERVOPACK.

  • If alarm still occurs, replace the SERVOPACK.
A.820
Encoder Checksum Error
Cause:
Linear scale fault; SERVOPACK fault.



Remedy:

  • Replace the linear scale.

  • Replace the SERVOPACK.
A.840
Encoder Data Error
Cause:
Linear scale malfunction; Misreading of linear scale; Speed exceeded allowable range; Noise interference; Hall sensor wiring incorrect/faulty.



Remedy:

  • Turn power OFF and ON. If alarm persists, replace linear scale.

  • Reinstall linear scale so tolerance is within allowable range.

  • Set motor speed within range specified by manufacturer.

  • Correct wiring by separating linear scale cable from main circuit cable.

  • Check grounding.

  • Correct hall sensor wiring or replace hall sensor.
A.850
Encoder Overspeed
Cause:
Servomotor speed higher than specified when power turned ON; Linear scale fault; SERVOPACK fault.



Remedy:

  • Set motor speed within range specified by linear scale manufacturer and restart.

  • Turn power OFF and ON. If alarm persists, replace linear scale.

  • Replace the SERVOPACK.
A.860
Encoder Overheated
Cause:
Ambient temperature too high; Motor load greater than rated load; Linear scale fault; SERVOPACK fault.



Remedy:

  • Reduce ambient operating temperature of servomotor to 40°C or less.

  • Operate so the motor load remains within specified range.

  • Turn power OFF and ON. If alarm persists, replace linear scale or SERVOPACK.
A.861
Motor Overheated
Cause:
Ambient temperature too high; Motor load greater than rated load; Serial converter fault; SERVOPACK fault.



Remedy:

  • Reduce ambient temperature to 40°C or less.

  • Reduce motor load.

  • Turn power OFF and ON. If alarm persists, replace serial converter unit or SERVOPACK.
A.890
Encoder Scale Error
Cause:
A linear scale fault occurred.



Remedy:

  • Replace the linear scale.
A.891
Encoder Module Error
Cause:
A linear scale fault occurred.



Remedy:

  • Turn power OFF and ON. If alarm persists, replace the linear scale cable.
A.b31
Current Detection Error 1 (Phase U)

A.b32
Current Detection Error 2 (Phase V)

A.b33
Current Detection Error 3
Cause:
Current detection circuit fault; Servomotor main circuit cable disconnected.



Remedy:

  • Turn power OFF and ON. If alarm persists, replace the SERVOPACK.

  • Check for disconnection of the servomotor main circuit cable and correct wiring.
A.bE0
Firmware Error
Cause:
A SERVOPACK fault occurred.



Remedy:

  • Turn power OFF and ON. If alarm persists, replace the SERVOPACK.
A.bF0
System Alarm 0

A.bF1
System Alarm 1

A.bF2
System Alarm 2
Cause:
A SERVOPACK fault occurred.



Remedy:

  • Turn power OFF and ON. If alarm persists, replace the SERVOPACK.
A.bF3

System Alarm 3
Cause: A SERVOPACK fault occurred.


Remedy: Turn the power supply to the SERVOPACK OFF and ON again. If the alarm still occurs, the SERVOPACK may be faulty. Replace the SERVOPACK.
A.bF4

System Alarm 4
Cause: A SERVOPACK fault occurred.


Remedy: Turn the power supply to the SERVOPACK OFF and ON again. If the alarm still occurs, the SERVOPACK may be faulty. Replace the SERVOPACK.
A.C10

Servo Overrun Detected
(Detected when servomotor power is ON)
Cause:

  • The order of phases U, V, and W in the servomotor wiring is incorrect.

  • The setting of the motor phase selection (Pn080.1) is incorrect.

  • A linear scale fault occurred.

  • A SERVOPACK fault occurred.




Remedy:

  • Confirm that the servomotor is correctly wired.

  • Check and correct the setting of Pn080.1.

  • Turn power OFF and ON. If alarm persists, replace the linear scale.

  • Turn power OFF and ON. If alarm persists, replace the SERVOPACK.
A.C20

Phase Detection Error
Cause:

  • The linear scale signal is weak.

  • The count-up direction of the linear scale does not match the forward direction of the motor coil assembly.

  • The hall sensor signal is affected by noise.

  • The setting of the linear scale pitch (Pn282) is incorrect.




Remedy:

  • Check signal voltage. Fine-adjust the installation of the linear scale head or replace the scale.

  • Change setting of Pn080.1 (Motor Phase Selection) or correctly reinstall the linear scale and motor coil assembly.

  • Correct the FG wiring and take measures against noise for the hall sensor wiring.

  • Check specifications of the linear scale and correct the value of Pn282.
A.C21

Hall Sensor Error
Cause:

  • The hall sensor is protruding from the motor magnetic way.

  • The hall sensor wiring is incorrect.

  • A hall sensor fault occurred.




Remedy:

  • Correctly reinstall the motor coil assembly or motor magnetic way.

  • Check and correct the hall sensor wiring.

  • Replace the hall sensor.
A.C22

Phase Information Disagreement
Cause: The SERVOPACK phase data does not match that of the linear scale.


Remedy: Execute polarity detection (Fn080).
A.C50

Polarity Detection Error
Cause:

  • Parameter settings (Pn282, Pn080.1) are incorrect.

  • Noise interference occurred on the scale signal.

  • An external force was applied to the motor coil assembly (e.g. cable tension).

  • The linear scale resolution is too low (>100 μm).




Remedy:

  • Set parameters (Pn282, Pn080.1) to match product specifications.

  • Take noise measures: Connect FG lines correctly, shield cables. Check if detection reference is repeatedly output in one direction.

  • Reduce external force so speed feedback becomes 0. If impossible, increase sequence input signal allocation (Pn481).

  • Use a scale with higher accuracy (<40 μm recommended) or increase polarity detection reference speed (Pn485).
A.C51

Overtravel Detection at Polarity Detection
Cause: An overtravel signal was detected during polarity detection.


Remedy: Perform wiring for overtravel signal. Execute polarity detection at a position where the overtravel signal is not detected.
A.C52

Polarity Detection Uncompleted
Cause: Servomotor ON while using absolute linear scale, but polarity detection (Pn587.0) was set to not execute (0) and polarity was not yet detected.


Remedy: Set parameter Pn587.0 to 1 to execute polarity detection.
A.C53

Out of Range for Polarity Detection
Cause: The moving distance exceeded the set value of Pn48E in the middle of detection.


Remedy: Increase the value of the polarity detection range (Pn48E) or increase the sequence input signal allocation (Pn481).
A.C54

Polarity Detection Error 2
Cause: External force was applied to the servomotor.


Remedy: Increase the polarity detection confirmation force reference (Pn495) or the detection allowable error range (Pn498). Note: Increasing Pn498 will increase motor temperature.
A.C80

Absolute Encoder Clear Error
Cause:

  • A linear scale fault occurred.

  • A SERVOPACK fault occurred.




Remedy:

  • Cycle power. If alarm persists, replace the linear scale.

  • Cycle power. If alarm persists, replace the SERVOPACK.
A.C90

Encoder Communications Error
Cause:

  • Contact fault of connector or incorrect wiring.

  • Cable disconnection, short-circuit, or incorrect impedance.

  • Corrosion (humidity/gas), intrusion of water/oil, or vibration affecting contacts.

  • Malfunction caused by noise interference.

  • A SERVOPACK fault occurred.




Remedy:

  • Re-insert connectors and confirm correct wiring.

  • Use cables with specified ratings.

  • Improve operating environment. Replace cable/SERVOPACK if necessary.

  • Separate linear scale cables from main circuit cables; check grounding.

  • Connect another SERVOPACK/Motor to test. If faulty, replace SERVOPACK.
A.C91

Encoder Communications Position Data Error
Cause:

  • Noise on I/O signal line (bent cables/damaged sheaths).

  • Linear scale cables bundled with high-current lines.

  • FG potential varies due to other machines (e.g., welders).




Remedy:

  • Check cable layout and connectors.

  • Confirm there is no surge voltage; separate cables.

  • Properly ground machines to separate from the linear scale FG.
A.C92

Encoder Communications Timer Error
Cause:

  • Noise interference on I/O signal line.

  • Excessive vibration/shocks applied to linear scale.

  • A linear scale fault occurred.

  • A SERVOPACK fault occurred.




Remedy:

  • Take countermeasures against noise for wiring.

  • Reduce machine vibration or correctly install the linear scale.

  • Cycle power; replace linear scale if faulty.

  • Cycle power; replace SERVOPACK if faulty.
A.CA0

Encoder Parameter Error
Cause:

  • A linear scale fault occurred.

  • A SERVOPACK fault occurred.




Remedy:

  • Cycle power. If alarm persists, replace the linear scale.

  • Cycle power. If alarm persists, replace the SERVOPACK.
A.Cb0

Encoder Echoback Error
Cause:

  • Wiring/contact incorrect.

  • Noise due to incorrect cable specifications.

  • Wiring distance too long (>20m).

  • FG potential variation.

  • Excessive vibration/shocks.

  • Hardware fault (Scale or SERVOPACK).




Remedy:

  • Correct wiring. Use tinned annealed copper shielded twisted-pair (core > 0.12mm²).

  • Ensure wiring distance is 20m max.

  • Properly ground machines.

  • Reduce vibration.

  • Cycle power and replace faulty component (Scale or SERVOPACK).
A.CF1

Feedback Option Module Communications Error (Reception error)
Cause:

  • Wiring between serial converter and SERVOPACK is incorrect/faulty.

  • Specified cable not used.

  • Cable too long (>20m).

  • Cable sheath broken.




Remedy:

  • Correct cable wiring.

  • Use specified cable.

  • Ensure cable length is 20m max.

  • Replace the cable.
A.CF2

Feedback Option Module Communications Error (Timer stop)
Cause:

  • Noise interferes with cable between serial converter and SERVOPACK.

  • A serial converter unit fault occurred.

  • A SERVOPACK fault occurred.




Remedy:

  • Correct wiring (separate signal lines from main circuit/grounding).

  • Replace the serial converter unit.

  • Replace the SERVOPACK.
A.d00

Position Error Overflow
Cause:

  • Servomotor U, V, W wiring is faulty.

  • Position reference speed or acceleration is too high.

  • Excessive position error alarm level (Pn520) is set too low.

  • A SERVOPACK fault occurred.




Remedy:

  • Confirm no contact fault in motor or linear scale wiring.

  • Reduce reference speed/acceleration or reconsider electronic gear ratio.

  • Set Pn520 to a proper value.

  • Cycle power. If alarm persists, replace SERVOPACK.
A.d01

Position Error Overflow Alarm at Servo ON
Cause: Servomotor power turned ON when position error > Pn526 (while power was OFF).


Remedy: Check position error amount (Un008) while power is OFF. Correct the excessive position error alarm level at servo ON (Pn526).
A.d02

Position Error Overflow Alarm by Speed Limit at Servo ON
Cause: Pn584 limits speed at ON, causing accumulated position errors to exceed Pn520.


Remedy: Correct Pn520 (excessive position error alarm level) or adjust Pn584 (speed limit level at servo ON).
A.d30

Position Data Overflow
Cause: The position data exceeded ±1879048192.


Remedy: Check the input reference pulse counter (Un00C). Reconsider the operating specifications.

A.E00


Command Option Module IF Initialization Timeout Error

Cause: The connection between the SERVOPACK and the command option module is faulty.


Remedy:

  • Check the connection between the SERVOPACK and the command option module.

  • Correctly connect the command option module.



Cause: A command option module fault occurred.


Remedy:

  • Replace the command option module.



Cause: A SERVOPACK fault occurred.


Remedy:

  • Replace the SERVOPACK.

A.E02


Command Option Module IF Synchronization Error 1

Cause: The timing of synchronization between the SERVOPACK and command option module changed due to change in the communications cycle of the host controller.


Remedy:

  • Turn the power supply OFF and then ON again.

  • If the alarm occurs again, restart communications processing from the host controller.



Cause: The connection between the SERVOPACK and the command option module is faulty.


Remedy:

  • Check the connection and correctly connect the command option module.



Cause: A command option module fault occurred.


Remedy:

  • Replace the command option module.



Cause: A SERVOPACK fault occurred.


Remedy:

  • Replace the SERVOPACK.

A.E03


Command Option Module IF Communications Data Error

Cause: An error occurred due to noise in the communications between the SERVOPACK and the command option module.


Remedy:

  • Take measures against noise.



Cause: The connection between the SERVOPACK and the command option module is faulty.


Remedy:

  • Check the connection and correctly connect the command option module.



Cause: A command option module fault or SERVOPACK fault occurred.


Remedy:

  • Replace the command option module.

  • Replace the SERVOPACK.

A.E40


Command Option Module IF Communications Setting Error

Cause: A command option module fault occurred.


Remedy:

  • Replace the command option module.

A.E50


Command Option Module IF Synchronization Error 2

Cause: The timing of synchronization changed due to change in communications cycle of the host controller.


Remedy:

  • Turn the power supply OFF and then ON again.

  • If the alarm occurs again, restart communications processing from the host controller.

A.E51


Command Option Module IF Synchronization Establishment Error

Cause: A command option module fault occurred.


Remedy:

  • Replace the command option module.

A.E60


Command Option Module IF Data Communications Error

Cause: An error occurred due to noise in the communications.


Remedy:

  • Take measures against noise.



Cause: The connection between the SERVOPACK and the command option module is faulty.


Remedy:

  • Check connection and correctly connect the command option module.



Cause: A command option module or SERVOPACK fault occurred.


Remedy:

  • Replace the command option module or SERVOPACK.

A.E61


Command Option Module IF Synchronization Error 3

Cause: The timing of synchronization changed due to host controller cycle change.


Remedy:

  • Turn power OFF and ON again. Restart communications processing from host controller.



Cause: Connection faulty, Module fault, or SERVOPACK fault.


Remedy:

  • Check connections.

  • Replace command option module.

  • Replace SERVOPACK.

A.E70


Command Option Module Detection Failure

Cause: Connection faulty or Module not connected.


Remedy:

  • Check connections.

  • Correctly connect the command option module.



Cause: Module fault or SERVOPACK fault.


Remedy:

  • Replace the command option module.

  • Replace the SERVOPACK.

A.E71


Safety Option Module Detection Failure

Cause: The connection to the safety option module is faulty.


Remedy:

  • Correctly connect the safety option module.



Cause: The safety option module was disconnected.


Remedy:

  • Execute Fn014 (Resetting configuration error) from digital operator or SigmaWin+.

  • Turn power supply OFF and ON again.



Cause: Safety option module or SERVOPACK fault.


Remedy:

  • Replace the safety option module or SERVOPACK.

A.E72


Feedback Option Module Detection Failure

Cause: The connection to the feedback option module is faulty.


Remedy:

  • Correctly connect the feedback option module.



Cause: The feedback option module was disconnected.


Remedy:

  • Execute Fn014 (Resetting configuration error).

  • Turn power supply OFF and ON again.



Cause: Feedback option module or SERVOPACK fault.


Remedy:

  • Replace the feedback option module or SERVOPACK.

A.E73


Unsupported Option Module

Cause: A command option module fault occurred.


Remedy:

  • Replace the command option module.



Cause: An unsupported command option module was connected.


Remedy:

  • Refer to the catalog and connect a compatible command option module.

A.E74


Unsupported Safety Option Module

Cause: A safety option module fault occurred.


Remedy:

  • Replace the safety option module.



Cause: An unsupported safety option module was connected.


Remedy:

  • Connect a compatible safety option module.

A.E75


Unsupported Feedback Option Module

Cause: A feedback option module fault occurred.


Remedy:

  • Replace the feedback option module.



Cause: An unsupported feedback option module was connected.


Remedy:

  • Connect a compatible feedback option module.

A.E80


Command Option Module Unmatched Error

Cause: The command option module was replaced with a different model.


Remedy:

  • Execute Fn014 (Resetting configuration error) from digital operator or SigmaWin+.

  • Turn power supply OFF and ON again.

A.EA2


DRV Alarm 2 (SERVOPACK WDT error)

Cause: Synchronization timing changed due to host controller.


Remedy:

  • Turn power OFF and ON again. Restart communications processing.



Cause: Connection faulty or Module fault.


Remedy:

  • Check/Correct connection.

  • Replace command option module.



Cause: A SERVOPACK fault occurred.


Remedy:

  • Turn power OFF and ON again. If alarm persists, replace SERVOPACK.

A.Eb1


Safety Function Signal Input Timing Error

Cause: The lag between activations of the input signals /HWBB1 and /HWBB2 is ten seconds or more.


Remedy:

  • Measure time lag between signals.

  • Check if output signal circuits/devices, SERVOPACK input circuits, or cables are faulty/disconnected.

A.Ed1


Command Option Module IF Command Timeout Error

Cause: Processing of the sensor ON command from the command option module is not completed.


Remedy:

  • Input a servo ON command when the linear servomotor is stopped.

  • Check that the linear scale is connected correctly.

A.F10


Main Circuit Cable Open Phase

(Low voltage continued for >1 sec in phase R, S, or T)

Cause: Three-phase power supply wiring is incorrect.


Remedy:

  • Confirm that the power supply is correctly wired.



Cause: Three-phase power supply is unbalanced.


Remedy:

  • Measure voltage at each phase. Balance power supply by changing phases.



Cause: Single-phase power input without setting Pn00B.2 to 1.


Remedy:

  • Match the parameter setting to the power supply.



Cause: A SERVOPACK fault occurred.


Remedy:

  • Turn power OFF and ON. If alarm persists, replace SERVOPACK.

A.F50


Servomotor Main Circuit Cable Disconnection

Cause: A SERVOPACK fault occurred.


Remedy:

  • Replace the SERVOPACK.



Cause: Wiring is not correct or faulty contact in motor wiring.


Remedy:

  • Check wiring. Make sure servomotor is correctly wired.

FL-1


System Alarm

Cause: SERVOPACK failure.


Remedy:

  • Turn power OFF and ON again. If alarm persists, replace SERVOPACK.

FL-2


System Alarm

Cause: SERVOPACK failure.


Remedy:

  • Turn power OFF and ON again. If alarm persists, replace SERVOPACK.

CPF00


Digital Operator Transmission Error 1

Cause: Contact between digital operator and SERVOPACK is faulty.


Remedy:

  • Check connector contact. Insert securely or replace cable.



Cause: Malfunction caused by noise interference.


Remedy:

  • Keep the digital operator or cable away from noise sources.

CPF01


Digital Operator Transmission Error 2

Cause: A digital operator fault occurred.


Remedy:

  • Disconnect and reconnect digital operator. If alarm persists, replace digital operator.



Cause: A SERVOPACK fault occurred.


Remedy:

  • Turn power OFF and ON again. If alarm persists, replace SERVOPACK.
A.900
Position Error Overflow

Cause:

The servomotor U, V, and W wirings are faulty.

Remedy:

Check the servomotor main circuit cable connection. Confirm that there is no contact fault in the motor wiring or linear scale wiring.


Cause:

The SERVOPACK gain is too low.

Remedy:

Increase the servo gain by using the function such as advanced autotuning.


Cause:

The acceleration of the position reference is too high.

Remedy:

Reduce the reference acceleration, and operate the SERVOPACK. Reduce the acceleration rate of the position reference.


Cause:

Setting of the excessive position error alarm level (Pn520) is low against the operating condition.

Remedy:

Check the alarm level (Pn520) to see if it is set to an appropriate value. Set Pn520 to proper value.


Cause:

A SERVOPACK fault occurred.

Remedy:

Turn the power supply to the SERVOPACK OFF and ON again. If the alarm still occurs, the SERVOPACK may be faulty. Replace the SERVOPACK.
A.901
Position Error Overflow Alarm at Servo ON

Cause:

When the servomotor power is ON, the position error exceeded the parameter setting (Pn526 × Pn528 / 100).

Remedy:

Set an appropriate value for the excessive position error warning level at servo ON (Pn528).
A.910
Overload
(Warning before alarm A.710 or A.720)

Cause:

Incorrect wiring or contact fault of servomotor and linear scale.

Remedy:

Check the wiring. Confirm that the servomotor and linear scale are correctly wired.


Cause:

Operation beyond the overload protection characteristics.

Remedy:

Check the motor overload characteristics and executed run command. Reconsider the load conditions and operating conditions. Or, increase the motor capacity.


Cause:

Excessive load was applied during operation because the servomotor was not driven due to mechanical problems.

Remedy:

Check the executed operation reference and motor speed. Remove the mechanical problems.


Cause:

A SERVOPACK fault occurred.

Remedy:

The SERVOPACK may be faulty. Replace the SERVOPACK.
A.911
Vibration

Cause:

Abnormal vibration was detected at the motor speed.

Remedy:

Check for abnormal noise from the servomotor, and check the speed and force waveforms during operation. Reduce the motor speed or reduce the servo gain by using functions such as one-parameter tuning.


Cause:

The mass ratio (Pn103) value is greater than the actual value or is greatly changed.

Remedy:

Check the mass ratio. Set the mass ratio (Pn103) to an appropriate value.
A.920
Regenerative Overload
(Warning before alarm A.320)

Cause:

The power supply voltage exceeds the specified limit.

Remedy:

Measure the power supply voltage. Set the power supply voltage within the specified range.


Cause:

Insufficient external regenerative resistance, regenerative resistor capacity, or SERVOPACK capacity. Or, regenerative power has been continuously flowing back.

Remedy:

Check the operating condition or the capacity using capacity selection software. Change the regenerative resistance, regenerative resistor capacity, or SERVOPACK capacity.


Cause:

Regenerative power continuously flowed back because negative load was continuously applied.

Remedy:

Check the load to the servomotor during operation. Reconsider the system including servo drives, machine, and operating conditions.
A.921
Dynamic Brake Overload
(Warning before alarm A.731)

Cause:

The servomotor moves because of external force.

Remedy:

Check the operation status. Take measures to ensure the servomotor will not move because of external force.


Cause:

The moving energy at a DB stop exceeds the DB resistance capacity.

Remedy:

Check the power consumed by DB resistance (Un00B) to see how many times the DB has been used. Reconsider the following: Reduce motor reference speed, reduce mass ratio, or reduce the number of times of the DB stop operation.


Cause:

A SERVOPACK fault occurred.

Remedy:

The SERVOPACK may be faulty. Replace the SERVOPACK.
A.94A
Command Option Module IF Data Setting Warning 1

Cause:

An incorrect parameter number was sent to the SERVOPACK from the host controller or command option module.

Remedy:

Specify the correct parameter number.
A.94B
Command Option Module IF Data Setting Warning 2

Cause:

Out-of-range data was sent to the SERVOPACK from the host controller or command option module.

Remedy:

Specify the value of the parameter within the allowable range.
A.94C
Command Option Module IF Data Setting Warning 3

Cause:

Incorrect parameter data was sent to the SERVOPACK from the host controller or command option module.

Remedy:

Specify the value of the parameter within the allowable range.
A.94D
Command Option Module IF Data Setting Warning 4

Cause:

The incorrect parameter size was sent to the SERVOPACK from the host controller or command option module.

Remedy:

Specify the correct parameter size.
A.94E
Command Option Module IF Data Setting Warning 5

Cause:

Incorrect latch mode settings were sent to the SERVOPACK from the host controller or command option module.

Remedy:

Set a proper value for the latch mode.
A.95A
Command Option Module IF Command Warning 1

Cause:

The host controller or command option module sent an operating command when the operation execution conditions in the SERVOPACK had not been satisfied.

Remedy:

Send a command after the operation conditions are satisfied.
A.95B
Command Option Module IF Command Warning 2

Cause:

The command option module sent a command that is not supported by the SERVOPACK.

Remedy:

Send a command that is supported by the SERVOPACK.
A.95D
Command Option Module IF Command Warning 4

Cause:

A latch command was sent from the command option module during latch operation.

Remedy:

Review the input sequence for the latch command.
A.95E
Command Option Module IF Command Warning 5

Cause:

An unallowed command combination was output to the SERVOPACK from the command option module.

Remedy:

Send a command that can be combined.
A.95F
Command Option Module IF Command Warning 6

Cause:

The command option module sent a command that is not supported by the SERVOPACK.

Remedy:

Send a command that is supported by the SERVOPACK.
A.960
Command Option Module IF Communications Warning

Cause:

An error occurred in communications between the SERVOPACK and command option module due to noise.

Remedy:

Take measures against noise.


Cause:

The connection between the SERVOPACK and the command option module is faulty.

Remedy:

Check the connection between the SERVOPACK and the command option module. Correctly connect the command option module.


Cause:

A command option module fault occurred.

Remedy:

Replace the command option module.


Cause:

A SERVOPACK fault occurred.

Remedy:

The SERVOPACK may be faulty. Replace the SERVOPACK.
A.971
Undervoltage

Cause:

The AC power supply voltage is low (100V: ≤60V, 200V: ≤140V, 400V: ≤280V).

Remedy:

Measure the power supply voltage. Set the power supply voltage within the specified range.


Cause:

The power supply voltage dropped during operation.

Remedy:

Measure the power supply voltage. Increase the power supply capacity.


Cause:

Occurrence of instantaneous power interruption.

Remedy:

Measure the power supply voltage. When the instantaneous power cut hold time (Pn509) is set, decrease the setting.


Cause:

The SERVOPACK fuse is blown out.

Remedy:

Replace the SERVOPACK and connect a reactor to the SERVOPACK.


Cause:

A SERVOPACK fault occurred.

Remedy:

The SERVOPACK may be faulty. Replace the SERVOPACK.
A.9A0
Overtravel
(Overtravel status is detected)

Cause:

When the servomotor power is ON, overtravel status is detected.

Remedy:

Check the input signal monitor (Un005) to check the status of the overtravel signals.

Refer to Troubleshooting Malfunction Based on Operation. Even if overtravel signals were not shown by the input signal monitor (Un005), momentary overtravel may have been detected.

– Do not specify movements that would cause overtravel from the host controller.

– Check the wiring of the overtravel signals.

– Take countermeasures for noise.