Mitsubishi MELSERVO MR-JET Servo Drive

Mitsubishi MELSERVO MR-JET Servo Drive Fault codes:

Fault Code and MeaningCause and Remedy
AL. 010.1
Voltage drop in the control circuit power
Cause:
1. Power connector not properly connected or wired.

2. Control circuit power supply voltage is too low.

3. Power was cycled before internal power supply stopped.

4. Instantaneous power failure > 60ms.

5. Incorrect wiring (1-phase power supply).



Remedy:

  • Check connection/wiring condition of the power connector (tighten screws, check for loose cables).

  • Check voltage (200V class: >160V AC; 400V class: >280V AC).

  • Shut off power, ensure LED is off, then cycle power.

  • Check power supply for problems and cycle power.

  • Refer to “Example power circuit connections” in the manual.
AL. 010.2
Voltage drop in the main circuit power
Cause:
1. Main circuit power connector not properly connected.

2. Main circuit power supply voltage is too low.

3. Bus voltage is too low at acceleration.

4. Power supply capacity is insufficient.

5. Main circuit capacitor has deteriorated.



Remedy:

  • Check connection and wiring condition of the connector.

  • Increase power supply voltage (200V class: >160V AC; 400V class: >280V AC).

  • Increase acceleration time constant or power supply capacity.

  • Check if specified power capacity is satisfied.

  • Replace the servo amplifier if capacitor reached end of service life.
AL. 011.1
Rotary switch setting error
Cause:
Values set with the rotary switches (SW1/SW2) are out of the settable range for the selected network.



Remedy:

  • Check settings of rotary switches (SW1/SW2).

  • If value matches but error persists, replace servo amplifier.

  • Refer to “Switch setting and display” in the User’s Manual.
AL. 012.1
RAM error 1
Cause:
1. An internal part of the servo amplifier (RAM) has malfunctioned.

2. Problem with surrounding environment (noise).



Remedy:

  • Disconnect all cables except power supply. Check repeatability. If failure continues, replace amplifier.

  • Check power supply for noise. Take countermeasures (filters, etc.).
AL. 013.1
CPU error 1
Cause:
1. Internal part malfunction (potentially noise related).

2. Clock from controller has an error.

3. Next axis servo amplifier malfunctioned.



Remedy:

  • Disconnect cables except power supply. If failure continues, replace servo amplifier.

  • If connected to controller, replace the controller.

  • Replace the servo amplifier of the next axis.

  • Implement noise reduction techniques.
AL. 014.1
Control process error 1
Cause:
1. Servo parameter settings are incorrect.

2. Problem with surrounding environment (noise/shorts).

3. Servo amplifier malfunction.



Remedy:

  • Return servo parameters to previous values and check again.

  • Check for noise or shorted connectors.

  • Replace the servo amplifier.
AL. 016.1
Encoder initial communication – Receive data error 1
Cause:
1. Encoder cable problem (disconnected, shorted, incorrect wiring).

2. Incompatible encoder type.

3. Environment noise.



Remedy:

  • Repair or replace the encoder cable.

  • Check if amplifier is compatible with the A/B/Z-phase differential output encoder.

  • Check power supply for noise; install filters.

  • Replace servo amplifier or servo motor if hardware failed.
AL. 017.1
Board error 1
Cause:
1. Problem with current detection circuit.

2. Problem with surrounding environment (noise/temperature).



Remedy:

  • Check if alarm occurs in servo-on status. If so, replace servo amplifier.

  • Check ambient temperature and noise conditions. Implement countermeasures.
AL. 019.1
Flash-ROM error 1
Cause:
1. Flash-ROM malfunction (possibly due to noise).

2. Firmware installation failed.



Remedy:

  • Disconnect all cables except power supply to check repeatability. Replace amplifier if needed.

  • Install the firmware again.
AL. 01A.1
Servo motor combination error 1
Cause:
1. Servo amplifier and motor connected incorrectly.

2. Motor does not support amplifier firmware version.

3. Parameters [Pr. PA17] and [Pr. PA18] not set correctly.



Remedy:

  • Refer to “Servo amplifier/motor combinations” manual.

  • Check firmware restrictions.

  • Set [Pr. PA17] and [Pr. PA18] correctly for the motor used.

  • Replace servo motor if encoder malfunctioned.
AL. 01E.1
Encoder malfunction
Cause:
1. The encoder has malfunctioned.

2. Problem with surrounding environment.



Remedy:

  • Replace the servo motor.

  • Check for noise and implement noise reduction techniques.
AL. 020.1
Encoder normal communication – Receive data error 1
Cause:
1. Encoder cable disconnected or shorted.

2. External conductor of cable not connected to ground plate.

3. Incorrect communication method parameter [Pr. PC04.3].



Remedy:

  • Repair or replace encoder cable.

  • Connect external conductor to connector ground plate.

  • Set servo parameter correctly (two-wire/four-wire type).

  • Check for vibration causing loose connections.
AL. 021.1
Encoder data error 1
Cause:
1. Excessive speed/acceleration due to oscillation.

2. Grounding issue with encoder cable.

3. Voltage drop due to long/thin wiring.



Remedy:

  • Decrease control gain.

  • Ensure proper grounding of cable shield.

  • Use recommended wire specifications for encoder cables.
AL. 024.1
Ground fault detected via hardware detection circuit
Cause:
1. Servo motor power cable has a ground fault or short.

2. Servo motor has a ground fault.

3. Power input cable and motor power cable are touching/shorted.



Remedy:

  • Check U/V/W wiring and grounding. Correct or replace cable.

  • Check insulation between phases. Replace servo motor if faulted.

  • Ensure input power cables and motor cables are not in contact.

  • If alarm occurs with motor disconnected, replace servo amplifier.
AL. 025.1
Servo motor encoder absolute position erased
Cause: Power was switched on for the first time in the absolute position detection system.



Remedy:

  • If set for the first time: Check that the battery is mounted correctly before homing.

  • For batteryless encoders: Allow alarm to occur for 5s, cycle power, then perform homing.




Cause: The batteryless absolute position encoder motor was changed to another motor.



Remedy:

  • Connect the original servo motor or start up the absolute position detection system again.




Cause: Battery was disconnected while power was off.



Remedy:

  • Check battery mounting, then perform homing.




Cause: Battery voltage is low (lower than 3 V DC) or exhausted.



Remedy:

  • Replace the battery, then execute homing.




Cause: Voltage drop in encoder cable or loose connection.



Remedy:

  • Use recommended cables.

  • Check connections with a tester.

  • Repair/replace cable, then execute homing.
AL. 027.1
Initial magnetic pole detection – Abnormal termination
Cause: A moving part collided against the machine.



Remedy:

  • Move the start position of the magnetic pole detection.




Cause: Servo motor power cable wiring is incorrect.



Remedy:

  • Check motor power cable for abnormality.




Cause: Linear encoder resolution setting differs from setting value.



Remedy:

  • Check settings of [Pr. PL02] and [Pr. PL03].
AL. 027.2
Initial magnetic pole detection – Time out error
Cause: Servo-on was turned on while the primary side of the linear servo motor was not stopped.



Remedy:

  • Stop the linear servo motor, then turn on the servo-on again.




Cause: Only one of the limit switches is on during magnetic pole detection.



Remedy:

  • Check limit switches and remove cause. Move start position.
AL. 028.1
Linear encoder environmental error
Cause: The ambient temperature of the linear encoder is outside of specifications.



Remedy:

  • Check ambient temperature and specifications.




Cause: The signal level of the linear encoder dropped.



Remedy:

  • Check the mounting condition of the linear encoder.
AL. 030.1
Regenerative heat error
Cause: The settings of the regenerative resistor (option) are incorrect.



Remedy:

  • Check [Pr. PA02] setting value.




Cause: The regenerative resistor is not connected or wiring is incorrect.



Remedy:

  • Check connections between P+ and C (or D depending on model).

  • If using built-in resistor, ensure proper wiring (P+ to C).




Cause: The power supply voltage is too high.



Remedy:

  • Check if input power exceeds upper limit (264 V AC for 200V class).

  • Reduce power supply voltage.
AL. 030.2
Regenerative signal error
Cause: The servo amplifier has malfunctioned (regenerative resistor overheating detection).



Remedy:

  • Check if regenerative resistor is overheating.

  • Check for short between P+ and C.

  • If resistor is compatible and wiring correct, replace servo amplifier.
AL. 031.1
Servo motor speed error (Overspeed)
Cause: Electronic gear settings are incorrect.



Remedy:

  • Check electronic gear function settings.




Cause: Command from controller is excessive.



Remedy:

  • Check if command exceeds max speed.

  • Adjust [Pr. PA28.4] Speed range limit selection.




Cause: Servo system is unstable and oscillating.



Remedy:

  • Adjust servo gain or reduce load.




Cause: Incorrect connection of power cable (U/V/W).



Remedy:

  • Check U/V/W wiring.
AL. 032.1
Overcurrent detected via hardware (during operation)
Cause: Servo motor power cable has a ground fault or short.



Remedy:

  • Check cable for shorts/ground faults. Replace if necessary.

  • Disconnect cable and check if alarm persists (implies Amplifier fault).




Cause: Servo motor has malfunctioned (Ground fault/Short).



Remedy:

  • Check insulation between phases (U/V/W) and ground. Replace motor if failed.




Cause: Dynamic brake malfunction or Regenerative resistor wiring error.



Remedy:

  • Check wiring of regenerative options.

  • Replace servo amplifier if internal brake failed.




Cause: Noise/Environment.



Remedy:

  • Implement noise reduction techniques.
AL. 033.1
Main circuit voltage error (Overvoltage)
Cause: Regenerative resistor settings incorrect or not connected.



Remedy:

  • Check [Pr. PA02] and wiring.

  • Measure resistance of built-in resistor.




Cause: Regeneration capacity insufficient.



Remedy:

  • Use a regenerative option with larger capacity.

  • Increase deceleration time constant.




Cause: Power supply voltage too high.



Remedy:

  • Check input voltage (Max 264V for 200V class).
AL. 035.1
Command frequency error
Cause: Command from controller is excessive.



Remedy:

  • Review operation pattern.

  • Change [Pr. PA28.4] Speed range limit.




Cause: Noise interference.



Remedy:

  • Take countermeasures to reduce noise.
AL. 037.1
Parameter setting range error
Cause: A parameter was set outside of the setting range.



Remedy:

  • Check parameter error No. on alarm display.

  • Review and correct the setting value.
AL. 03A.1
Inrush current suppression circuit error
Cause: Inrush current limit resistor overheated due to frequent power ON/OFF.



Remedy:

  • Review usage/frequency of power cycling.




Cause: Servo amplifier malfunction.



Remedy:

  • Replace the servo amplifier.
AL. 042.1
Servo control error based on position deviation
Cause: [Pr. PA17] and [Pr. PA18] Motor series/type settings incorrect.



Remedy:

  • Check parameters [Pr. PA17] and [Pr. PA18].




Cause: Encoder mounting direction or wiring incorrect.



Remedy:

  • Check wiring signals.

  • Check [Pr. PC27.0] Encoder pulse count polarity.




Cause: Droop pulses too large.



Remedy:

  • Review operation status.

  • Review [Pr. PL05] Position deviation error detection level.
AL. 045.1
Main circuit device overheat error 1
Cause: Ambient temperature exceeded 55 °C.



Remedy:

  • Lower the ambient temperature.




Cause: Overload status occurred frequently (Power cycled repeatedly).



Remedy:

  • Review operation pattern.




Cause: Cooling fan/heatsink clogged.



Remedy:

  • Clean the cooling fan, heat sink, or openings.
AL. 046.1
Servo motor temperature error 1
Cause: Ambient temperature of servo motor exceeded specified value.



Remedy:

  • Lower ambient temperature.




Cause: Servo motor is overloaded (Effective load ratio > 100%).



Remedy:

  • Reduce load or review operation pattern.




Cause: Thermal sensor in encoder malfunctioned.



Remedy:

  • Check motor temp. If cold but alarm exists, replace servo motor.
AL. 047

Cooling fan error
(Includes 047.1, 047.2)
Cause: A foreign object was caught in the cooling fan.


Remedy:

  • Check if a foreign object is caught in the cooling fan. If found, remove it.




Cause: The cooling fan is contaminated and damaged (due to oil/liquid ingress).


Remedy:

  • Check the condition of the cooling fan. If contaminated/damaged, replace the fan unit.

  • Review the usage environment as needed.




Cause: The cooling fan has reached the end of its service life.


Remedy:

  • Replace the fan unit.




Cause: The servo amplifier has malfunctioned.


Remedy:

  • Replace the servo amplifier.
AL. 050

Overload 1
(Includes 050.1 – 050.6)
Cause: The servo motor power cable was disconnected.


Remedy:

  • Check the servo motor power cable, then repair or replace the cable.




Cause: The connection of the servo motor is incorrect (U/V/W wiring).


Remedy:

  • Check the U/V/W wiring. Refer to “Example power circuit connections” in the Hardware Manual.




Cause: The electromagnetic brake has not been released.


Remedy:

  • Check if the electromagnetic brake has been released during operation.




Cause: A current larger than the continuous output current flowed (High Load).


Remedy:

  • Check effective load ratio and operation pattern.

  • Reduce load or replace with larger-capacity servo motor.




Cause: The servo system is unstable and resonating.


Remedy:

  • Adjust the gain so that the system does not resonate.




Cause: The servo amplifier, encoder, or linear encoder has malfunctioned.


Remedy:

  • Replace the servo amplifier, motor, or linear encoder.




Cause: A moving part collided against the machine (Specific to 050.4).


Remedy:

  • Review operation pattern to avoid collision. Check for interference.
AL. 051

Overload 2
(Includes 051.1 – 051.2)
Cause: A moving part collided against the machine.


Remedy:

  • Review the operation pattern to avoid collision. Check for interference.




Cause: The servo motor power cable was disconnected or incorrect.


Remedy:

  • Repair or replace the servo motor power cable. Check U/V/W wiring.




Cause: The connection of the encoder cable is incorrect.


Remedy:

  • Check if the encoder cable is connected correctly.




Cause: The torque is insufficient (saturated).


Remedy:

  • Check peak load ratio. Reduce load or review operation pattern.

  • Alternatively, replace with larger-capacity servo motor.
AL. 052

Excessive error (Droop pulse)
(Includes 052.1 – 052.6)
Cause: Servo motor power cable disconnected or wiring incorrect.


Remedy:

  • Repair/replace cable. Check U/V/W wiring for loose screws/errors.




Cause: Torque limit enabled or set to 0.


Remedy:

  • Increase torque limit value. Do not input command when limit is 0.




Cause: Moving part collided or Brake not released.


Remedy:

  • Review operation pattern. Check if electromagnetic brake releases during operation.




Cause: Power supply voltage dropped.


Remedy:

  • Review power supply voltage and capacity.




Cause: Acceleration time constant too short or Gain too small.


Remedy:

  • Set longer accel/decel time constant.

  • Increase position control gain [Pr. PB08].




Cause: Motor shaft rotated by external force.


Remedy:

  • Measure actual position under servo-lock. Review machine for external forces.
AL. 054

Oscillation detection
(Includes 054.1)
Cause: The servo system is unstable and oscillating.


Remedy:

  • Check torque ripple with MR Configurator2.

  • Adjust servo gain (auto tuning) or set machine resonance suppression filter.




Cause: Resonance frequency changed due to aging.


Remedy:

  • Measure resonance frequency and update the suppression filter settings.
AL. 056

Forced stop error
(Includes 056.2 – 056.5)
Cause: Forced stop deceleration time constant is short.


Remedy:

  • Set a larger value in [Pr. PC24 Deceleration time constant at forced stop].




Cause: Torque limit enabled.


Remedy:

  • Review torque limit value.




Cause: Servo system is unstable and oscillating.


Remedy:

  • Check torque ripple and adjust servo gain or suppression filter.
AL. 061

Operation error
(Includes 061.1)
Cause: “1” or “3” is set for the auxiliary function of the last point table.


Remedy:

  • Review the settings of the auxiliary function.
AL. 063

STO timing error
(Includes 063.1, 063.2)
Cause: STO1 or STO2 turned off while motor was rotating.


Remedy:

  • After servo motor stops, turn off (enable) STO1/STO2.

  • Review “STO timing error selection” [Pr. PF06.1].
AL. 068

STO diagnosis error
(Includes 068.1)
Cause: STO1 or STO2 input incorrectly (CN8 wiring).


Remedy:

  • Check that STO1 and STO2 are wired correctly.




Cause: Input status of STO1 and STO2 are different.


Remedy:

  • Set the same input status for STO1 and STO2.




Cause: STO diagnosis error detection time [Pr. PF18] is incorrect.


Remedy:

  • Set a longer time in the servo parameter settings.




Cause: Problem with surrounding environment (Noise).


Remedy:

  • Implement noise reduction techniques (check grounding/shielding).
AL. 069

Command error
(Includes 069.1 – 069.6)
Cause: Command position exceeded 32 bits or Software Limit.


Remedy:

  • Check if command exceeds 32 bits. Set correctly.

  • Check software limit settings [Pr. PT15/PT17].




Cause: Stroke limit switch (LSP/LSN/FLS/RLS) not connected or positioned incorrectly.


Remedy:

  • Check if limit switches are connected and positioned correctly.




Cause: Problem with surrounding environment (Noise).


Remedy:

  • Implement noise reduction techniques.
AL. 070

Load-side encoder initial communication error
(Includes 070.1 – 070.F)
Cause: Encoder cable disconnected, shorted, or incorrect wiring (A/B/Z phase).


Remedy:

  • Check if load-side encoder cable is connected/wired correctly.

  • Check A/B/Z phase wiring and pulse signals.




Cause: External power supply voltage unstable.


Remedy:

  • Review power supply capacity and voltage.




Cause: Incompatible linear encoder type (4-wire).


Remedy:

  • Check compatibility with 4-wire type linear encoders.




Cause: Noise or surrounding environment.


Remedy:

  • Implement noise reduction techniques.




Cause: Manufacturer parameters changed.


Remedy:

  • Set servo parameters for manufacturer setting to initial values.
AL. 071

Load-side encoder normal communication error
(Includes 071.1 – 071.7)
Cause: Encoder cable problem or shielding issue.


Remedy:

  • Check cable continuity. Connect external conductor to ground plate.




Cause: Z-phase signal not detected or interval pulses different from setting.


Remedy:

  • Check Z-phase wiring.

  • Check [Pr. PE51 Load-side encoder resolution setting].




Cause: A/B/Z wiring incorrect (Differential output type).


Remedy:

  • Check PA, PAR, PB, PBR, PZ, PZR signals.
AL. 072

Load-side encoder normal communication error 2
(Includes 072.1 – 072.6)
Cause: Excessive speed/acceleration detected due to oscillation.


Remedy:

  • Decrease control gain.




Cause: Load-side encoder signal not input.


Remedy:

  • Check if encoder cable is wired correctly.




Cause: Noise or surrounding environment.


Remedy:

  • Implement noise reduction techniques (magnetic fields/temp).
AL. 076

Load-side encoder error
(Includes 076.2 – 076.3)
Cause: Values of servo parameters for manufacturer setting changed.


Remedy:

  • Set the servo parameters for manufacturer setting to the initial values.
AL. 086

Network communication error
Cause: An error occurred in the network communication.

1. A network cable is disconnected.

2. The wiring of the network cable was incorrect.

3. Devices on the network (hubs/repeaters) are off.

4. Network settings or environment noise.



Remedy:

  • Check if the network cable is connected correctly.

  • Turn off the power supply, then connect the network cable correctly.

  • Check if the connection of the network cable is correct.

  • Check that devices on the network are turned on.

  • Check for noise and ambient temperature; implement countermeasures.

  • If the controller or amp has malfunctioned, replace the device.
AL. 088

Watchdog
Cause: The CPU or other component parts have malfunctioned.

1. There is a problem with the surrounding environment.

2. An internal part of the servo amplifier has malfunctioned.



Remedy:

  • Check the noise, ambient temperature, and other conditions.

  • Implement appropriate countermeasures (e.g., noise reduction).

  • Replace the servo amplifier.
AL. 08E

Serial communication error
Cause: A communication error occurred between the servo amplifier and PC/Controller (USB).

1. Settings of the PC/equipment are incorrect.

2. Problem with communication cable.

3. Noise/Environment issues.



Remedy:

  • Check the settings of the personal computer and other equipment.

  • Check the communication cable, then check repeatability.

  • Check power supply for noise; check if connector has shorted.

  • Replace the servo amplifier.
AL. 08F

Two-digit alarm No. display alarm
Cause: A three-digit alarm is occurring (e.g., AL. 100 to AL. 1FF, AL. 200 to 2FF, etc.).



Remedy:

  • Check the alarm number using an object that can read three-digit numbers (MR Configurator2 or Amp display).

  • Refer to the troubleshooting for the specific 3-digit alarm code displayed.
AL. 090

Homing incomplete warning
Cause: Homing has not been finished or did not complete properly.

1. Homing has not been executed.

2. Positioning executed without homing after absolute position erase.

3. Homing completion turned off after execution.



Remedy:

  • Execute homing.

  • Remove causes that turned off homing completion, then execute homing again.

  • Refer to “Homing mode” in the User’s Manual.
AL. 091

Servo amplifier overheat warning
Cause: The temperature inside the servo amplifier reached a warning level.

1. Ambient temperature > 55 °C.

2. Close mounting specifications not met.

3. Heat sink clogged.



Remedy:

  • Lower the ambient temperature.

  • Check specifications for close mounting clearances.

  • Clean the heat sink or remove clogging causes.
AL. 092

Battery cable disconnection / Battery degradation
Cause: Battery voltage for absolute position detection has decreased.

1. Battery not connected or cable disconnected.

2. Battery voltage is too low (exhausted).

3. Problem with encoder cable BAT wiring.



Remedy:

  • Check if the battery is connected correctly.

  • Check voltage with a tester. If < 3.1V (or < 3.0V for degradation), replace battery.

  • Check BAT wiring of the encoder cable for shorts or disconnection.
AL. 095

STO warning (STO1/STO2 off detection)
Cause: The STO input signal turned off when the servo motor was stopped.

1. STO1 or STO2 is input incorrectly.

2. STO turned off while STO timing error detection was enabled.



Remedy:

  • Refer to the wiring diagram and correct the wiring.

  • Review settings of “STO timing error selection” (Pr. PF06.1).

  • Replace the servo amplifier if hardware malfunction is suspected.
AL. 096

Home position setting warning
Cause: Homing failed.

1. In-position (INP) did not turn on within specified time.

2. Command input during homing.

3. Creep speed too high.

4. External force moved the motor shaft.



Remedy:

  • Adjust gains so droop pulses are within In-position range.

  • Ensure no command is input during homing.

  • Decelerate the creep speed.

  • Perform homing after the servo motor stops completely.
AL. 098

Software position limit warning
Cause: The software position limit set by parameters has been reached.

1. Forward/Reverse rotation-side software stroke limit reached.



Remedy:

  • Check the operation pattern.

  • Operate the system within the range of the software position limit.

  • Check if Pr. PT15 and Pr. PT17 (Software position limits) are set correctly.
AL. 099

Stroke limit warning
Cause: The stroke limit signal is off.

1. LSP/LSN (Limit Switch) not connected.

2. Stroke end exceeded during driving.

3. Limit switch malfunction.



Remedy:

  • Check if limit switches are connected correctly.

  • Check status on I/O monitor in MR Configurator2.

  • Check the operation pattern.

  • Repair or adjust the limit switch sensor.
AL. 09B

Excessive error warning
Cause: Droop pulses exceeded the warning occurrence level.

1. Motor power cable disconnected/incorrect wiring.

2. Torque limit enabled or insufficient torque.

3. Collision or external force on shaft.

4. Acceleration/deceleration time too short.



Remedy:

  • Repair/replace motor power cable. Check U/V/W wiring.

  • Increase torque limit value if limited.

  • Review operation pattern to avoid collision.

  • Increase [Pr. PB08 Position control gain].

  • Set a longer acceleration/deceleration time constant.
AL. 09E

Network warning
Cause: Error in network data reception or settings.

1. Unsupported communication cycle set.

2. Cyclic point size too large.

3. IP address duplication.

4. Parameter file error.



Remedy:

  • Review settings on the master side.

  • Change communication cycle or speed (e.g., 500μs or more).

  • Review IP address settings [Pr. NPA01/NPA02].

  • Cycle the power if parameter automatic setting was performed.
AL. 09F

Battery warning
Cause: Battery voltage for absolute position detection system has decreased.

1. Battery disconnected.

2. Voltage low (< 4.9V DC).



Remedy:

  • Check battery connection.

  • Replace the battery.

  • Check encoder cable BAT wiring.
AL. 0E0

Excessive regeneration warning
Cause: The regenerative load ratio exceeded 85%.

(Note: [AL. 030.1 Regenerative heat error] may occur subsequently).



Remedy:

  • Refer to remedy for AL. 030.1.

  • Check regenerative load ratio and operation pattern.
AL. 0E1

Overload warning 1
Cause: The load was over 85% of the alarm trigger level of Overload alarms (AL. 050/051).



Remedy:

  • Refer to remedies for AL. 050 (Overload 1) or AL. 051 (Overload 2).

  • Reduce load or increase acceleration/deceleration times.
AL. 0E2.1
Servo motor temperature warning
Cause: The temperature of the servo motor reached 85% of the occurrence level of [AL. 046.2 Servo motor overheat].



Remedy:

  • Refer to remedies for AL. 046.2.
AL. 0E2.2
Servo motor temperature warning 2
Cause: The temperature inside of the servo motor has reached a warning level.



Remedy:

  • Refer to remedies for AL. 046.1.
AL. 0E3.1
Multi-revolution counter travel distance exceeded warning

Cause: 1. In the absolute position system, the travel distance from the home position became 32768 rev or more.

Remedy:

  • Review the operation range.

  • After the power is cycled, perform homing again.




Cause: 2. Absolute position detection system configuration error (Pr. PC29.5 is not set to “0”).

Remedy:

  • Set [Pr. PC29.5] to “0” (disabled).
AL. 0E3.2
Absolute position counter warning

Cause: 1. There is a problem with the surrounding environment (noise, temperature).

Remedy:

  • Check noise and ambient temperature.

  • Implement countermeasures to reduce noise (refer to Manual).

  • After the power is cycled, perform homing again.




Cause: 2. The encoder has malfunctioned.

Remedy:

  • Replace the servo motor.
AL. 0E6.1
Forced stop warning

Cause: 1. EM2/EM1 was turned off.

Remedy:

  • After ensuring safety, turn EM2/EM1 on.




Cause: 2. An external 24 V DC power supply has not been input.

Remedy:

  • Input the external 24 V DC power supply.




Cause: 3. The servo amplifier has malfunctioned.

Remedy:

  • Replace the servo amplifier.
AL. 0E8.1
Decreased cooling fan speed

Cause: 1. A foreign object was caught in the cooling fan.

Remedy:

  • Remove the foreign object.




Cause: 2. The cooling fan has reached the end of its service life.

Remedy:

  • Check the total power-on time. If service life exceeded, replace the servo amplifier or fan unit.
AL. 0E9.1
Servo-on signal on during main circuit off
Cause:

  1. Bus voltage is less than specified value (215 V DC for 200V class).

  2. Servo-on command input with main circuit power off.

  3. Main circuit power supply wiring disconnected.

  4. Power supply capacity insufficient.

  5. Main circuit capacitor deteriorated.

  6. Servo amplifier malfunction.




Remedy:

  • Review wiring and check power supply capacity.

  • Turn on main circuit power supply.

  • Connect main circuit power supply.

  • Check if specified capacity is satisfied.

  • Replace servo amplifier if capacitor service life is exceeded.

  • Replace the servo amplifier.
AL. 0E9.2
Bus voltage drop during low speed operation
Cause: The bus voltage dropped under the specified value when the servo motor was rotating at 50 r/min or lower.



Remedy:

  • Review the power supply capacity.

  • Increase the acceleration time constant.
AL. 0EC.1
Overload warning 2
Cause: The load is excessive or the capacity is insufficient.



Remedy:

  • Reduce the load.

  • Alternatively, replace the servo motor with a larger-capacity servo motor.
AL. 0ED.1
Output watt excess warning
Cause: The output wattage of the servo motor (speed × torque) steadily exceeds 120% of the rated output.



Remedy:

  • Reduce the servo motor speed.

  • Reduce the load.

  • Alternatively, replace the servo motor with a larger-capacity servo motor.
AL. 0F0.3
Vibration tough drive warning
Cause: The setting value of the machine resonance suppression filter was changed due to a machine resonance.



Remedy:

  • Set the machine resonance suppression filter.

  • Check the machine status for loose screws and other problems.
AL. 0F2.1
Drive recorder warning 1

Cause: 1. There is an error in the drive recorder data.

Remedy:

  • Check if clearing the alarm history of the drive recorder with MR Configurator2 disables the warning.




Cause: 2. There is a memory error.

Remedy:

  • Refer to AL. 119.1, 119.7, or 119.8 remedies.




Cause: 3. The Flash-ROM has malfunctioned.

Remedy:

  • Replace the servo amplifier.
AL. 0F4.4
Target position setting range error warning
Cause: The target position was set outside of the setting range.



Remedy:

  • Set the target position correctly, then cancel the warning (turn on C_ORST).
AL. 0F4.6
Acceleration time constant setting range error warning
Cause: The acceleration time constant was set outside of the setting range.



Remedy:

  • Set [Pr. PT49] correctly, then cancel the warning by turning on C_ORST.
AL. 0F4.7
Deceleration time constant setting range error warning
Cause: The deceleration time constant was set outside of the setting range.



Remedy:

  • Set [Pr. PT50] correctly, then cancel the warning by turning on C_ORST.
AL. 0F4.8
Control command input error warning
Cause: The relative position command was input while the unit was set to “degree”.



Remedy:

  • If Controlword bit 6 is on while [Pr. PT01.2] is “2”, turn off Controlword bit 6.

  • Cancel the warning (turn on C_ORST).
AL. 0F4.A
Fully closed loop control – Switching warning
Cause: Switching between semi closed loop and fully closed loop was executed during homing or profile mode.



Remedy:

  • Stop the operation in the homing mode (hm) or profile position mode (pp).

  • Cancel the warning by turning on C_ORST.
AL. 0FE.1
Two-digit warning No. display warning (100s)
Cause: A warning with warning No. in 100s ([AL. 1_ _]) is occurring.



Remedy:

  • Check the warning number using the servo display or MR Configurator2.

  • Take corrective action for the specific warning found.
AL. 0FE.x
Two-digit warning No. display (200s – F00s)
Cause: A warning with warning No. in ranges 200s through F00s is occurring.



Remedy:

  • Check the warning number using the servo display or MR Configurator2.

  • Take corrective action for the specific warning found.
AL. 118.1
Encoder communication circuit diagnosis in progress
Cause: The servo amplifier is in the encoder communication circuit diagnosis mode.



Remedy:

  • Cancel the encoder communication circuit diagnosis mode.
AL. 119.1
Memory error 4-1

Cause: 1. Problem with surrounding environment (Noise/Short).

Remedy:

  • Check power supply for noise; take countermeasures.

  • Check if connector has shorted.




Cause: 2. Internal part malfunction.

Remedy:

  • Replace the servo amplifier.
AL. 119.3
Memory error 4-3
Cause: The firmware has been updated.



Remedy:

  • Update to latest firmware version, check repeatability.

  • If failure continues, replace servo amplifier.
AL. 119.4
Memory error 4-4
Cause: The firmware has been updated.



Remedy:

  • Cycle the power, then check repeatability.

  • If failure continues, replace servo amplifier.
AL. 119.7
Memory free space error 4-1
Cause: The free memory space is insufficient.



Remedy:

  • Delete unnecessary files to free up memory.

  • If no files can be deleted, backup data and initialize servo amplifier.

  • If failure continues, replace servo amplifier.
AL. 119.8
Memory free space error 4-2
Cause: Too many files are saved in the memory.



Remedy:

  • Delete files to reduce the number of files.

  • If problem persists, backup data and initialize servo amplifier.
AL. 11A.1
Servo motor constant file error
Cause: Writing of the servo motor constant file failed (likely noise).



Remedy:

  • After writing the servo motor constant again, cycle the power.

  • Check environment for noise.

  • Replace servo amplifier if Flash-ROM malfunctioned.
AL. 11A.2
Servo motor constant file extension error
Cause: A file with an extension other than “.mmd2” was written.



Remedy:

  • Delete the written file, then write another file with extension “.mmd2”.
AL. 11A.3
Servo motor constant file amount error
Cause: Two or more servo motor constant files were written.



Remedy:

  • Delete the written files, then write only one servo motor constant file.
AL. 130.1
Regenerative heat error
Cause:

  1. Regenerative resistor settings incorrect.

  2. Regenerative resistor not connected.

  3. Wrong combination of amplifier and resistor.

  4. Power supply voltage too high.

  5. Regenerative power too large.




Remedy:

  • Refer to “Regenerative option” in Manual for settings/connections.

  • Check if input voltage exceeds permissible limit (264 V AC for 200V class).

  • Reduce positioning frequency or load.

  • Set longer deceleration time.

  • Use a regenerative option.
AL. 139.2
Output open-phase error

Cause: 1. An open phase occurred in the servo motor power line.

Remedy:

  • Check connections of motor power line and power supply.

  • If line is open, replace the servo motor power line.




Cause: 2. The winding inside the servo motor is disconnected.

Remedy:

  • Replace the servo motor, then check repeatability.
AL. 17A.1
Load-side linear encoder error 1-1
Cause:

  1. Linear encoder/head incorrectly mounted.

  2. Encoder cable shield not connected to ground plate.

  3. Problem with surrounding environment (noise).

  4. Linear encoder alarm detected.




Remedy:

  • Adjust positions of linear encoder and head.

  • Connect shield to ground plate of connector.

  • Implement noise countermeasures.

  • Refer to “Detailed Explanation of AL. 02A” in Partner’s Encoder Manual.
AL. 188 (AL. 188.1)
Watchdog 2
Cause: An internal part of the servo amplifier has malfunctioned (CPU or other component parts).



Remedy:

  • Replace the servo amplifier.
AL. 19D.1
IP address change unreflected warning
Cause: The IP address setting with engineering software was configured after the communication with the master station was established.



Remedy:

  • Cycle the power of the servo amplifier or reset the software to apply changes to the settings.

  • Refer to “IP address setting function via the master station” in the User’s Manual (Communication Function).
AL. 19D.2
IP address change failed warning 1
Cause: When [Pr. NPA01 IP address setting] is set to “0” (rotary switch used) and the rotary switch is set to a value other than “0”, the IP address setting with engineering software was configured.



Remedy:

  • Set [Pr. NPA01 IP address setting] to “1” (network parameter used).

  • Alternatively, configure the IP address setting after setting the rotary switch to “0”.
AL. 19E.1
Parameter automatic backup setting warning
Cause: An error was detected in the parameter automatic backup setting.



Remedy:

  • Check if the master station supports power interruption protection.

  • If not supported, set [Pr. PN20 Parameter automatic backup update interval] to “0” to disable the function.
AL. 19E.2
Control mode setting warning 2
Cause:
1. An unsupported control mode was used.

2. A control mode that does not support CC-Link IE TSN Class A was used.



Remedy:

  • Check if the control mode corresponds to the communication cycle.

  • Check if the control mode supports CC-Link IE TSN Class A.

  • Refer to “Restrictions” in the User’s Manual (Introduction).
AL. 19E.3
Safety communication setting warning
Cause: The safety communication setting of the controller has been enabled for a servo amplifier on which the safety communication has been disabled.



Remedy:

  • If not using safety communication, disable the safety communication setting of the controller.

  • If using safety communication, enable the safety communication setting of the servo amplifier.
AL. 1F6 (Sub-codes .1 to .6)
Manufacturer setting error
Cause: Values of the servo parameters for manufacturer setting have been changed / set incorrectly.



Remedy:

  • Set the servo parameters for manufacturer setting to the initial values.
AL. 1F8.1
Memory writing frequency warning
Cause: The frequency of writing to the memory exceeded the guaranteed number.



Remedy:

  • Prepare for replacing the servo amplifier by making a backup of necessary data.

  • This warning can be disabled by [Pr. PF02.4], but the memory may break if used continuously.
AL. 1F8.2
Memory free space warning
Cause: The available free space in the memory is insufficient.



Remedy:

  • Delete unnecessary files to free up memory.

  • If no files can be deleted, backup parameters and initialize the servo amplifier.

  • This warning can be disabled by [Pr. PF02.5], but Memory free space error (AL. 119.7) may occur.
AL. 201 – AL. 28F
Manufacturer setting error
Cause: Values of the servo parameters for manufacturer setting have been changed.



Remedy:

  • Set the servo parameters for manufacturer setting to the initial values.
AL. 290 – AL. 2FF
Manufacturer setting warning
Cause: Values of the servo parameters for manufacturer setting have been changed.



Remedy:

  • Set the servo parameters for manufacturer setting to the initial values.
AL. 510 (Sub-codes A1-A2, B1-B6)
Voltage diagnosis error (safety sub-function)
Cause:
1. Power supply not properly connected.

2. Servo amplifier malfunction.

3. Problem with surrounding environment (Noise).



Remedy:

  • Check the wiring and power circuit connections.

  • Replace the servo amplifier.

  • Check power supply for noise and take countermeasures (refer to Noise reduction techniques).
AL. 512 (Sub-codes A2, A3, B2, B3)
Memory error 1 (RAM) (safety sub-function)
Cause:
1. Internal part (RAM) malfunction.

2. Problem with surrounding environment (Noise).



Remedy:

  • Disconnect all cables except control circuit power, then check repeatability. If failure continues, replace servo amplifier.

  • Check power supply for noise and take countermeasures.
AL. 514 (Sub-codes B, B2)
Control process error (safety sub-function)
Cause:
1. Servo parameter settings are incorrect.

2. Internal part malfunction.

3. Problem with surrounding environment (Noise).



Remedy:

  • Return servo parameter to the value before alarm occurrence and check again.

  • Replace the servo amplifier.

  • Check power supply for noise and take countermeasures.
AL. 515 (Sub-codes B)
Memory error 2 (ROM) (safety sub-function)
Cause:
1. Problem with ROM operation at power-on.

2. Problem with surrounding environment (Noise).

3. Frequency of writing exceeded 100,000.



Remedy:

  • Disconnect cables (except control power) and check repeatability. Replace servo amplifier if needed.

  • Check power supply for noise and take countermeasures.

  • Check if excessively frequent changes have been made to parameters, then replace the servo amplifier.
AL. 517 (Sub-codes A2, B1)
Board error (safety sub-function)
Cause:
1. Internal part of servo amplifier malfunctioned.

2. Problem with surrounding environment.



Remedy:

  • Replace the servo amplifier.

  • Check noise, ambient temperature, and other conditions. Implement countermeasures.
AL. 518 (Sub-codes A2, B2)
Synchronous control error (safety sub-function)
Cause:
1. Internal part of servo amplifier malfunctioned.

2. Problem with surrounding environment.



Remedy:

  • Replace the servo amplifier.

  • Check power supply for noise and take countermeasures.
AL. 519 (Sub-codes A2, B2)
Memory error 3 (Flash-ROM) (safety sub-function)
Cause:
1. Flash-ROM malfunction.

2. Problem with surrounding environment.



Remedy:

  • Disconnect cables (except control power) and check repeatability. Replace servo amplifier if needed.

  • Check power supply for noise and take countermeasures.
AL. 52A (Sub-codes A, B)
Position feedback error (safety sub-function)
Cause:
1. Feedback data does not change within set time.

2. Servo motor malfunction.

3. Servo amplifier malfunction.



Remedy:

  • Review setting of [Pr. PSA22]. Alternatively, operate system within set time.

  • If position feedback does not change when driven, replace servo motor.

  • Replace the servo amplifier.
AL. 537 (Sub-codes A, B)
Parameter setting range/combination error
Cause:
1. Functional safety parameter set outside range.

2. Servo or safety parameter set incorrectly (Combination error).

3. Functional safety parameter failed to set properly.



Remedy:

  • Check parameter error No. on MR Configurator2 and review setting values.

  • Refer to “Parameter combinations that trigger error” in the Manual.
AL. 53A (Sub-codes A2, B2)
Parameter verification error (safety sub-function)
Cause:
1. Problem with functional safety parameter settings.

2. Servo amplifier malfunction.



Remedy:

  • Confirm which parameter has an error using MR Configurator2, then set correctly.

  • Replace the servo amplifier.
AL. 540 / 541 / 542 (Multiple sub-codes)
Internal diagnosis error 1/2/3 (safety sub-function)
Cause:
1. Servo amplifier malfunction.

2. Problem with surrounding environment.



Remedy:

  • Replace the servo amplifier.

  • Check power supply for noise and take countermeasures.
AL. 543

Internal diagnosis error 4 (safety sub-function)
Cause: There is an error in the result from the functional safety diagnosis.


Remedy: Refer to manual for specific data error (A1 through B6) diagnosis.
AL. 544

Temperature diagnosis error (safety sub-function)
Cause: 1. The ambient temperature exceeded the specified value (60 °C).


Remedy: Check the ambient temperature, and if the temperature exceeds the specified value, lower the ambient temperature.





Cause: 2. The ambient temperature is 0 °C or lower.


Remedy: Check the ambient temperature, and if the temperature is lower than 0 °C, raise the ambient temperature.





Cause: 3. The servo amplifier does not meet the specifications of close mounting.


Remedy: Check the specifications of close mounting. Refer to “Mounting direction and clearances” in the MR-JET User’s Manual (Hardware).





Cause: 4. A cooling fan, heat sink, or opening is clogged.


Remedy: Clean the cooling fan, heat sink, or openings.





Cause: 5. The servo amplifier has malfunctioned.


Remedy: Replace the servo amplifier.
AL. 545

Internal diagnosis error 5 (safety sub-function)
Cause: There is an error in the result from the functional safety diagnosis.


Remedy: Refer to manual (Data error A2).
AL. 546

Internal diagnosis error 6 (safety sub-function)
Cause: There is an error in the result from the functional safety diagnosis.


Remedy: Refer to manual (Data error A1 through B2).
AL. 547

Internal diagnosis error 7 (safety sub-function)
Cause: There is an error in the result from the functional safety diagnosis.


Remedy: Refer to manual (Data error A1 through B2).
AL. 549

Internal diagnosis error 8 (safety sub-function)
Cause: There is an error in the result from the functional safety diagnosis.


Remedy: Refer to manual (Data error A1 through B1).
AL. 54A

Internal diagnosis error 9 (safety sub-function)
Cause: There is an error in the result from the functional safety diagnosis.


Remedy: Refer to manual (Data error A1 through B3).
AL. 54D

Internal diagnosis error 10 (safety sub-function)
Cause: There is an error in the result from the functional safety diagnosis.


Remedy: Refer to manual (Data error A1 through B1).
AL. 54F

Safety software error (safety sub-function)
Cause: An error occurred in the safety software (Register setting error A1).


Remedy: Refer to manual diagnosis for AL. 540.1.
AL. 550

Internal diagnosis error 11 (safety sub-function)
Cause: There is an error in the result from the functional safety diagnosis (Internal signal error A1 through B4).


Remedy: Refer to manual.
AL. 551

Internal diagnosis error 12 (safety sub-function)
Cause: There is an error in the result from the functional safety diagnosis (Internal signal error A1 through B4).


Remedy: Refer to manual.
AL. 552

Internal diagnosis error 13 (safety sub-function)
Cause: There is an error in the result from the functional safety diagnosis (Internal signal error A1 through B1).


Remedy: Refer to manual.
AL. 554

Input device internal diagnosis error (safety sub-function)
Cause: 1. The servo amplifier has malfunctioned.


Remedy: Replace the servo amplifier.





Cause: 2. There is a problem with the surrounding environment.


Remedy: Check the noise, ambient temperature, and other conditions. Implement appropriate countermeasures (e.g., reduce noise). Refer to “Noise reduction techniques” in the MR-JET User’s Manual.
AL. 555

Output device diagnosis error 1 (safety sub-function)
Cause: 1. A signal of an output device has not been output correctly, or the load of the output device has exceeded the specified range.


Remedy: Check if the output device cable is wired correctly, or check if the load of the output device is within specifications.





Cause: 2. The output device current is too large.


Remedy: Check if the current value is within the specified value. Lower the output current if the specified value is exceeded.





Cause: 3. The servo amplifier has malfunctioned.


Remedy: Replace the servo amplifier.





Cause: 4. There is a problem with the surrounding environment.


Remedy: Check the noise, ambient temperature, and other conditions. Implement appropriate countermeasures.
AL. 556

Output device diagnosis error 2 (safety sub-function)
Cause: 1. [Pr. PSD30 Output device – Test pulse off time] has been set incorrectly.


Remedy: Review the setting of [Pr. PSD30].





Cause: 2. Other factors.


Remedy: Take actions in accordance with AL. 555 (Output device diagnosis error 1).
AL. 557

Input device mismatch detection (safety sub-function)
Cause: 1. The input signals of SDI1A and SDI1B (or SDI2/SDI3) remained mismatched for longer than the specified time.


Remedy:

  • Review the wiring of the input devices (SDI1A/B, SDI2A/B, SDI3A/B).

  • Refer to “USING STO FUNCTION” and “USING FUNCTIONAL SAFETY” in the hardware manual.

  • Set [Pr. PSD18], [Pr. PSD19], or [Pr. PSD20] to a value longer than the mismatched time.







Cause: 2. The servo amplifier has malfunctioned.


Remedy: Replace the servo amplifier.





Cause: 3. There is a problem with the surrounding environment (Noise).


Remedy: Check noise conditions and implement countermeasures.
AL. 561

Safety speed monitor error 1 (safety sub-function)
Cause: 1. The state where the absolute value of the servo motor speed exceeds the setting value of [Pr. PSA11 SLS speed 1] continued for the time set in [Pr. PSA15].


Remedy:

  • Review the parameter or the operation pattern.

  • Set the speed command to a value equal to or lower than the value of [Pr. PSA11].

  • Set the time required for deceleration in [Pr. PSA07].







Cause: 2. The settings of the electronic gear are incorrect.


Remedy: Check the setting value of the electronic gear.





Cause: 3. The servo system is unstable and oscillating.


Remedy: Adjust the servo gain or reduce the load.





Cause: 4. The velocity waveform overshot.


Remedy: Increase the acceleration/deceleration time constant.





Cause: 5. The connection destination of the encoder cable is incorrect.


Remedy: Check the connection destination of the encoder.





Cause: 6. The encoder has malfunctioned.


Remedy: Replace the servo motor.
AL. 562

Safety speed monitor error 2 (safety sub-function)
Cause: The state where the absolute value of the servo motor speed (or speed command) exceeds the setting value of [Pr. PSA13 SLS speed 3] or [Pr. PSA14 SLS speed 4] continued for the specified time.


Remedy:

  • Review the parameter or the operation pattern.

  • Set the speed command to a value equal to or lower than the limit values.

  • Adjust deceleration monitor time settings [Pr. PSA07].
AL. 563 (563.1 – 563.A)
Deceleration monitor error (safety sub-function)
Cause:

  • The servo motor exceeded the monitor speed specified by [Pr. PSA24] during SS1 operation.

  • Connection destination of encoder cable is incorrect.

  • Problem with servo motor or power cable.

  • Encoder or Amplifier malfunction.

  • Noise or surrounding environment issues.




Remedy:

  • Review the parameter or operation pattern.

  • Set a larger value in [Pr. PSA26] or adjust servo gains.

  • Check connection destination of the encoder.

  • Replace the servo motor or power cable.

  • Check noise/temperature conditions and implement countermeasures.
AL. 565 (565.1 – 565.C)
Direction monitor error (safety sub-function)
Cause:

  • The servo motor moved in the incorrect direction (address increasing/decreasing) while the SDI function was operating.

  • The velocity waveform overshot.

  • Servo motor wiring (U/V/W) is incorrect.




Remedy:

  • Review the parameter or operation pattern.

  • Check if a command in the incorrect direction was input.

  • If velocity overshot, increase the acceleration/deceleration time constant.

  • Check the U/V/W wiring.
AL. 568 (568.1 – 568.C)
Torque monitor error 1 (safety sub-function)
Cause:

  • The torque feedback or command exceeded the torque set in [Pr. PSB10/PSB14] or [Pr. PSB11/PSB15] after SLT function operation.




Remedy:

  • Review the parameter or operation pattern.

  • Check if the threshold for the torque monitor is too small.

  • Check if the servo motor collides with the machine.
AL. 569 (569.1 – 569.C)
Torque monitor error 2 (safety sub-function)
Cause:

  • The torque feedback or command exceeded the torque set in [Pr. PSB12/PSB16] or [Pr. PSB13/PSB17] after SLT function operation.




Remedy:

  • Review the parameter or operation pattern.

  • Check if the threshold for the torque monitor is too small.

  • Check if the servo motor collides with the machine.
AL. 580 (580.3, 580.B)
Safety communication setting error
Cause:

  • The safety verification code of the controller does not match the setting of [Pr. PSC06].

  • Controller communicated with unintended servo amplifier.




Remedy:

  • Check if IP address matches the servo amplifier being used.

  • Set values to identify each servo amplifier in [Pr. PSC06] avoiding duplication.

  • Ensure verification codes match in the controller settings.
AL. 581 (581.1 – 581.E)
Safety communication error 1 (Receive data error)
Cause:

  • Safety communication settings of the master station are incorrect.

  • Problem on the safety master station side.




Remedy:

  • Review safety communication settings (refer to manual).

  • Check for alarms on the safety master station and troubleshoot the master.
AL. 582 (582.1 – 582.F)
Safety communication error 2 (Receive data error)
Cause:

  • Problem with received data in safety communication.




Remedy:

  • Refer to remedies for AL. 581 (Master station settings and status).
AL. 583 (583.2 – 583.E)
Safety communication error 3 (Receive data error)
Cause:

  • Problem with received data in safety communication.




Remedy:

  • Refer to remedies for AL. 581 (Master station settings and status).
AL. 584 (584.1 – 584.D)
FSoE communication setting error
Cause:

  • FSoE Address in Master does not match [Pr. PSC07].

  • FSoE Watchdog Timer value not supported.

  • Parameter length notified by Master is incorrect.

  • SRA parameter notified by Master is incorrect.




Remedy:

  • Review [Pr. PSC07] and Master address settings.

  • Review Watchdog Timer setting in Master.

  • Review project setting in FSoE Master.

  • If SRA parameter is set, do not set it (not supported).
AL. 585 (585.1 – 585.C)
FSoE communication error 1 (Initial communication)
Cause:

  • Safety communication settings incorrect.

  • Problem with FSoE Master (Alarm occurred).

  • Network cable disconnected or wiring incorrect.

  • Devices (hubs/repeaters) turned off.

  • Data transmission interrupted or network disconnected improperly.

  • Hardware malfunction (Amplifier, Controller, or Network device).

  • Noise/Environment issues.




Remedy:

  • Review communication settings.

  • Check FSoE Master for alarms.

  • Connect network cables correctly; check for disconnections.

  • Ensure all network devices are powered on.

  • Check noise environment and implement countermeasures.

  • Replace faulty hardware (Amplifier, Controller, Hubs).
AL. 586 (586.1 – 586.D)
FSoE communication error 2 (Runtime communication)
Cause:

  • Standard network/cable issues (see AL. 585).

  • Specific to 586.5/D: The update time exceeded the time set in FSoE Watchdog Time.




Remedy:

  • Perform standard network checks (cables, noise, power).

  • Review the setting value of FSoE Watchdog Time in the Master.

  • Review the communication cycle setting.
AL. 587 (587.1 – 587.F)
FSoE communication error 3
Cause:

  • Safety communication settings incorrect.

  • Problem with FSoE Master.

  • Network cable disconnected/wiring incorrect.

  • Hardware malfunction or Noise.




Remedy:

  • Review communication settings.

  • Check Master for alarms.

  • Check cables and wiring.

  • Check noise environment.

  • Replace faulty hardware.
AL. 595 (595.1 – 595.9)
STO command off warning
Cause:

  • The STO command of the functional safety has been turned off (enabled).




Remedy:

  • Turn on (disable) the STO command of the functional safety.
AL. 596 (596.1 – 596.9)
SS1 time-out warning
Cause:

  • The time set in [Pr. PSA03 SS1 deceleration monitor time] has passed after SS1 command was turned off.

  • Deceleration monitor timing issues relative to [Pr. PSA04] stop speed.




Remedy:

  • Turn on (disable) the SS1 command.
AL. 59D (59D.1 – 59D.E)
Internal diagnosis error
Cause:

  • The servo amplifier has malfunctioned.

  • Problem with surrounding environment (Noise/Temperature).




Remedy:

  • Replace the servo amplifier.

  • Check noise, ambient temperature, and implement countermeasures.
AL. 5E0 (5E0.1 – 5E0.F)
Safety input device fixing diagnosis incomplete
Cause:

  • Fixing diagnosis at startup not executed.

  • Parameter [Pr. PSD27] set incorrectly.

  • Wiring incorrect.

  • Hardware malfunction or Noise.




Remedy:

  • Check if fixing diagnosis at startup has been executed.

  • Check settings in [Pr. PSD27].

  • Check wiring.

  • Replace servo amplifier or implement noise countermeasures.
AL. 5E1 (5E1.1 – 5E1.9)
Test mode setting mismatch warning
Cause:

  • The test operation mode has been set incorrectly.




Remedy:

  • Check if the servo amplifier and [Pr. PSA01.1 Input mode selection] are both set for test mode.

  • Review settings.