Mitsubishi MELSERVO-JE Servo Drive Fault Codes:
| Fault Code and Meaning | Cause and Remedy |
|---|---|
| 10.1 Undervoltage: Voltage drop in the power | Cause:
Remedy:
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| 10.2 Undervoltage: Bus voltage drop | Cause:
Remedy:
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| 11.1 Switch setting error | Cause:
Remedy:
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| 12.1 – 12.6 RAM error (1 to 6) | Cause:
Remedy:
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| 13.1 Clock error 1 | Cause:
Remedy:
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| 14.1 Control process error 1 | Cause:
Remedy:
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| 15.1 EEP-ROM error at power on | Cause:
Remedy:
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| 15.2 EEP-ROM error during operation | Cause:
Remedy:
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| 15.4 Home position information read error | Cause:
Remedy:
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| 16.1 Encoder initial communication error 1 | Cause:
Remedy:
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| 16.3 Encoder initial communication error 3 | Cause:
Remedy:
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| 17.1 Board error 1 | Cause:
Remedy:
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| 17.4 Board error 3 | Cause:
Remedy:
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| 19.1 – 19.5 Memory error 3 (Flash-ROM) | Cause:
Remedy:
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| 1A.1 Servo motor combination error | Cause:
Remedy:
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| 1A.4 Servo motor combination error 2 | Cause:
Remedy:
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| 1E.1 Encoder initial communication error 2 | Cause:
Remedy:
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| 1F.1 Incompatible encoder | Cause:
Remedy:
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| 20.1 Encoder normal communication error 1 | Cause:
Remedy:
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| 21.1 Encoder data error 1 | Cause:
Remedy:
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| 24.1 Main circuit error: Ground fault | Cause:
Remedy:
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| 25.1 Servo motor encoder – Absolute position erased | Cause: Absolute position data is faulty. Common causes include: first time power-on, battery replacement, disconnected battery cable during power-off, low battery voltage (< 3V), or cable/encoder malfunction. Remedy:
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| 30.1 Regeneration heat error | Cause: Regenerative resistor/option setting is incorrect ([Pr. PA02]), not connected, or the regenerative load ratio exceeded 100% (power supply high). Remedy:
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| 30.2 Regeneration signal error | Cause: A detection circuit of the servo amplifier is malfunctioning (overheating). Remedy:
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| 30.3 Regeneration feedback signal error | Cause: Detection circuit malfunction or external noise/ground fault. Remedy:
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| 31.1 Abnormal motor speed (Overspeed) | Cause: Motor speed exceeded permissible limit. Causes include: high command pulse frequency, incorrect electronic gear setting, unstable system, or overshooting velocity waveform. Remedy:
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| 32.1 Overcurrent detected at hardware detection circuit | Cause: Current higher than permissible applied. Causes: Amp malfunction, ground fault/short in motor cable, dynamic brake malfunction, or noise. Remedy:
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| 32.2 Overcurrent detected at software detection circuit | Cause: High servo gain (oscillation), Amp malfunction, short/ground fault, or noise. Remedy:
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| 32.3 / 32.4 Overcurrent detected (during stop) | Cause: Detected at hardware (32.3) or software (32.4) during a stop. Remedy:
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| 33.1 Main circuit voltage error (Overvoltage) | Cause: Bus voltage exceeded 400 V DC. Causes: Regenerative setting error, wire breakage, insufficient regeneration capacity, or high power supply voltage. Remedy:
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| 34.1 SSCNET receive data error | Cause: SSCNET III/H communication error (continuous). Cable disconnected, dirty tip, broken wire, or noise. Remedy:
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| 35.1 Command frequency error | Cause: Input command pulse frequency is too high, or filter setting [Pr. PA13] is incorrect. Remedy:
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| 36.1 SSCNET receive error 2 | Cause: Intermittent communication error (approx 70ms interval). Cable disconnected, dirty, broken, or noise. Remedy:
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| 37.1 Parameter setting range error | Cause: A parameter was set out of range, or a setting contradicts another. Remedy:
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| 37.2 Parameter combination error | Cause: A parameter setting contradicts another. Remedy:
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| 37.3 Point table setting error | Cause: The setting of point tables is incorrect. Remedy:
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| 39.1 Program error | Cause: Checksum mismatch at power-on (noise or write error). Remedy:
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| 39.2 Instruction argument external error | Cause: Program never written, or command argument out of specifications. Remedy:
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| 39.3 Register No. error | Cause: General purpose register number is out of specifications. Remedy:
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| 39.4 Non-correspondence command error | Cause: Used command is not supported. Remedy:
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| 3A.1 Inrush current suppression circuit error | Cause: Inrush current suppressor circuit is malfunctioning. Remedy:
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| 3E.1 Operation mode error | Cause: (1) An incompatible controller with SSCNET III/H was connected. (2) The controller was connected as SSCNET III. Remedy:
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| 3E.6 Operation mode switch error | Cause: (1) Positioning mode in servo amplifier (point table/program) differs from actual positioning mode. Remedy:
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| 45.1 Main circuit device overheat error | Cause: (1) Ambient temperature exceeded 55 ˚C. (2) Close mounting is out of specifications. (3) Repeated On/Off under overload status. (4) Cooling fan, heat sink, or openings clogged. (5) Servo amplifier malfunction. Remedy:
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| 46.1 Abnormal temperature of servo motor 1 | Cause: (1) Ambient temperature of servo motor exceeded 40 ˚C. (2) Servo motor is overloaded. (3) Thermal sensor in encoder is malfunctioning. Remedy:
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| 46.5 Abnormal temperature of servo motor 3 | Cause: See Cause for 46.1. Remedy:
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| 46.6 Abnormal temperature of servo motor 4 | Cause: (1) Current applied to servo amplifier in excess of continuous output current. Remedy:
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| 47.2 Cooling fan speed reduction error | Cause: (1) Foreign matter caught in cooling fan. (2) Cooling fan reached end of life. Remedy:
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| 50.1 Thermal overload error 1 during operation | Cause: (1) Servo motor power cable disconnected. (2) Connection of servo motor (U/V/W) incorrect. (3) Electromagnetic brake not released. (4) Current exceeded continuous output current. (5) Encoder cable connection incorrect. (6) Servo system unstable/resonating. (7) Servo amplifier malfunctioning. (8) Encoder malfunctioning. Remedy:
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| 50.2 Thermal overload error 2 during operation | Cause: See Cause for 50.1. Remedy:
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| 50.4 Thermal overload error 1 during a stop | Cause: (1) Moving part collided against machine. (2) Servo motor power cable disconnected. (3) Hunting occurs during servo-lock. (4) Electromagnetic brake not released. (5) Current exceeded continuous output current. (6) Encoder cable connection incorrect. (7) Servo system unstable/resonating. (8) Servo amplifier malfunctioning. (9) Encoder or servo motor malfunctioning. Remedy:
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| 50.5 Thermal overload error 2 during a stop | Cause: See Cause for 50.4. Remedy:
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| 51.1 Thermal overload error 3 during operation | Cause: (1) Servo motor power cable disconnected. (2) Connection of servo motor (U/V/W) incorrect. (3) Connection of encoder cable incorrect. (4) Torque is insufficient. (5) Servo amplifier malfunctioning. (6) Encoder or servo motor malfunctioning. Remedy:
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| 51.2 Thermal overload error 3 during a stop | Cause: (1) A moving part collided against the machine. (2) Other causes (Refer to 51.1). Remedy:
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| 52.1 Excess droop pulse 1 | Cause: (1) Servo motor power cable disconnected. (2) Connection of servo motor incorrect. (3) Encoder cable connection incorrect. (4) Torque limit enabled. (5) Moving part collided with machine. (6) Electromagnetic brake not released. (7) Torque insufficient. (8) Power supply voltage dropped. (9) Acceleration/deceleration time too short. (10) Position loop gain is small. (11) Error excessive alarm level set incorrectly. (12) Shaft rotated by external force. (13) Servo-on enabled while motor rotating. (14) Encoder/Motor malfunction. (15) Amplifier malfunction. Remedy:
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| 52.3 Excess droop pulse 2 | Cause: See Cause for 52.1. Remedy:
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| 52.4 Error excessive during 0 torque limit | Cause: (1) The torque limit value is 0. Remedy:
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| 52.5 Excess droop pulse 3 | Cause: See Cause for 52.1. Remedy:
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| 52.6 Excess droop pulse during servo-off | Cause: (1) Servo motor shaft was rotated by external force. (2) Servo-on was enabled while servo motor was rotating. (3) Controller malfunctioning. (4) Encoder or servo motor malfunctioning. (5) Servo amplifier malfunctioning. Remedy:
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| 54.1 Oscillation detection error | Cause: (1) Servo system is unstable and oscillating. (2) Resonance frequency changed due to deterioration. (3) An encoder is malfunctioning. Remedy:
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| 56.2 Over speed during forced stop | Cause: (1) Forced stop deceleration time constant is short. (2) Torque limit has been enabled. (3) Servo system unstable and oscillating. (4) An encoder is malfunctioning. Remedy:
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| 56.3 Estimated distance over during forced stop | Cause: (1) Forced stop deceleration time constant is short. (2) Torque limit has been enabled. (3) An encoder is malfunctioning. Remedy:
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| 61.1 Point table setting range error | Cause: (1) “1” or “3” was set to auxiliary function of point table (No. 31 or No. 255). Remedy:
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| 69.1 Forward rotation-side software limit detection | Cause: (1) Command position exceeded 32 bits when software limit activated. (2) Command position exceeded 30 bits from value set when software limit activated. (3) Controller malfunctioning. (4) Noise interference. Remedy:
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| 69.2 Reverse rotation-side software limit detection | Cause: See Cause for 69.1. Remedy:
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| 69.3 Forward rotation stroke end detection | Cause: (1) Command position exceeded 30 bits from detected position after LSP detection. (2) Forward rotation stroke limit switch not connected to LSP. (3) Controller malfunctioning. (4) Noise interference. Remedy:
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| 69.4 Command excess error (Reverse rotation stroke end detection) | Cause: (1) The command position exceeded 30 bits from the detected position after the detection of LSN (Reverse rotation stroke end). Remedy:
Cause: (2) The reverse rotation stroke limit switch is not connected to LSN correctly. Remedy:
Cause: (3) The controller is malfunctioning. Remedy:
Cause: (4) Something near the device caused noise/interference. Remedy:
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| 86.1 Network communication error 1 | Cause: (1) A network cable was disconnected. Remedy:
Cause: (2) The wiring of the network cable was incorrect. Remedy:
Cause: (3) A network cable was disconnected (malfunction). Remedy:
Cause: (4) The network was disconnected by a wrong procedure. Remedy:
Cause: (5) Data transmission from the controller was interrupted. Remedy:
Cause: (6) The setting of the controller is incorrect. Remedy:
Cause: (7) Noise or ambient temperature issue. Remedy:
Cause: (8) The servo amplifier is malfunctioning. Remedy:
Cause: (9) The controller is malfunctioning. Remedy:
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| 86.4 Network communication error 4 | Cause: See causes for [AL. 86.1]. Remedy:
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| 86.5 Network communication error 5 | Cause: See causes for [AL. 86.1]. Remedy:
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| 8A.1 USB/Serial communication time-out error | Cause: (1) Communication commands have not been transmitted. Remedy:
Cause: (2) A communication cable was disconnected. Remedy:
Cause: (3) The servo amplifier is malfunctioning. Remedy:
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| 8A.2 Modbus RTU communication time-out error | Cause: (1) Communication commands have not been transmitted. Remedy:
Cause: (2) A communication cable was disconnected. Remedy:
Cause: (3) The servo amplifier is malfunctioning. Remedy:
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| 8C.1 Network module communication error 1 | Cause: (1) The servo amplifier is malfunctioning. Remedy:
Cause: (2) Something near the device caused it (Noise, temp). Remedy:
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| 8C.2 to 8C.7 Network module communication error 2-7 | Cause: Internal network module communication error. Remedy:
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| 8E.1 USB/Serial communication receive error | Cause: (1) The setting of the personal computer, etc. is incorrect. Remedy:
Cause: (2) A communication cable is malfunctioning. Remedy:
Cause: (3) The servo amplifier is malfunctioning. Remedy:
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| 8E.2 USB/Serial communication checksum error | Cause: (1) The setting of the personal computer, etc. is incorrect. Remedy:
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| 8E.3 USB/Serial communication character error | Cause: (1) The transmitted character is out of specifications. Remedy:
Cause: (2) The communication protocol is failure. Remedy:
Cause: (3) The setting of the personal computer, etc. is incorrect. Remedy:
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| 8E.4 USB/Serial communication command error | Cause: Same causes as 8E.3 (Command out of spec, protocol failure, or settings incorrect). Remedy:
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| 8E.5 USB/Serial communication data number error | Cause: Same causes as 8E.3 (Data number out of spec, protocol failure, or settings incorrect). Remedy:
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| 8E.6 Modbus RTU communication receive error | Cause: (1) The setting of the controller/amplifier is incorrect (baud rate, parity, etc). Remedy:
Cause: (2) A communication cable is malfunctioning. Remedy:
Cause: (3) The servo amplifier is malfunctioning. Remedy:
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| 8E.7 Modbus RTU communication message frame error | Cause: (1) The communication protocol is failure. Remedy:
Cause: (2) The setting of the controller/amplifier is incorrect. Remedy:
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| 8E.8 Modbus RTU communication CRC error | Cause: Check it with the check method for [AL. 8E.7]. Remedy:
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| 88._ / 8888._ Watchdog | Cause: (1) A part in the servo amplifier (CPU) is failure. Remedy:
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| 90.1 Home position return incomplete warning | Cause: (1) An automatic operation was executed while the home position return did not complete. Remedy:
Cause: (2) Positioning operation executed without home setting after absolute position erased [AL. 25]. Remedy:
Cause: (3) (Indexer method) Home position return not executed after home pos return completion 2 was off. Remedy:
Cause: (4) (Indexer method) [AL. E3] occurred simultaneously. Remedy:
Cause: (5) Home position return completion 2 turned off after execution. Remedy:
Cause: (6) Software stroke limit detected. Remedy:
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| 90.2 Home position return abnormal termination | Cause: (1) A home position return speed did not decelerate to a creep speed. Remedy:
Cause: (2) The proximity dog is not connected to DOG. Remedy:
Cause: (3) A stroke limit was detected after home position return started. Remedy:
Cause: (4) Deceleration from home position return speed/creep speed failed at the indexer method. Remedy:
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| 90.5 Z-phase unpassed | Cause: (1) The Z-phase signal was not detected normally. Remedy:
Cause: (2) A home position return was executed while the servo motor did not pass the Z-phase. Remedy:
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| 91.1 Main circuit device overheat warning | Cause: (1) The ambient temperature of the servo amplifier has exceeded 55 °C. Remedy:
Cause: (2) The close mounting is out of specifications. Remedy:
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| 92.1 Encoder battery cable disconnection warning | Cause: (1) The battery cable is not connected to CN4. Remedy:
Cause: (2) A battery cable was disconnected (or malfunction). Remedy:
Cause: (3) The battery voltage is low (consumed). Remedy:
Cause: (4) An encoder cable was disconnected. Remedy:
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| 92.3 Battery degradation | Cause: (1) The battery voltage is low (consumed). Remedy:
Cause: (2) The battery has deteriorated. Remedy:
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| 96.1 In-position warning at home positioning | Cause: (1) INP (In-position) did not turn on within the specified time during home positioning. Remedy:
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| 96.2 Command input warning at home positioning | Cause: (1) A command is inputted at home positioning. Remedy:
Cause: (2) Creep speed is high. Remedy:
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| 96.3 Servo off warning at home positioning | Cause: (1) A home positioning was executed during servo-off. Remedy:
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| 97.1 Program operation disabled warning | Cause: (1) Started a program while the program operation was disabled. Remedy:
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| 97.2 Next station position warning | Cause: (1) An abnormal value was specified to a signal input of the next station position. Remedy:
Cause: (2) The power was not cycled after the number of stations per rotation was changed. Remedy:
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| 98.1 Forward rotation-side software stroke limit reached | Cause: (1) A software limit was set within the actual operation range. Remedy:
Cause: (2) A point table of the position data which exceeds the software limit was executed. Remedy:
Cause: (3) A software limit was reached using JOG or manual pulse generator. Remedy:
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| 98.2 Reverse rotation-side software stroke limit reached | Cause: See causes for [AL. 98.1]. Remedy:
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| 99.1 Forward rotation stroke end off | Cause: (1) The forward rotation stroke limit switch is not connected. (2) The forward rotation stroke limit was exceeded during driving. Remedy:
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| 99.2 Reverse rotation stroke end off | Cause: (1) The reverse rotation stroke limit switch is not connected. (2) The reverse rotation stroke limit was exceeded during driving. Remedy:
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| 9B.1 Excess droop pulse 1 warning | Cause: (1) Servo motor power cable disconnected. (2) Incorrect U/V/W connection. (3) Incorrect encoder cable connection. (4) Torque limit enabled. (5) Collision with machine part. (6) Insufficient torque (load too high). (7) Power supply voltage dropped. (8) Acceleration/deceleration time too short. (9) Position loop gain is small. (10) Motor shaft rotated by external force. (11) Encoder malfunctioning. Remedy:
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| 9B.4 Error excessive warning during 0 torque limit | Cause: The torque limit value is set to 0. Remedy:
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| 9F.1 Low battery | Cause: (1) Battery cable not connected to CN4. (2) Battery voltage is low (less than 4.9 V DC). Remedy:
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| E0.1 Excessive regeneration warning | Cause: Regenerative power exceeded 85% of the permissible power of the built-in resistor or option. Remedy:
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| E1.1 – E1.8 Thermal overload warning 1 | Cause: The load was over 85% of the alarm level for thermal overload (during operation or stop). Remedy:
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| E3.1 Multi-revolution counter travel distance excess | Cause: Travel distance from home position is 32768 rev or more. Remedy:
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| E3.2 Absolute position counter warning | Cause: (1) Noise or ambient temperature issue. (2) Encoder malfunctioning. Remedy:
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| E3.4 Absolute positioning counter EEP-ROM writing frequency warning | Cause: Home position renewed twice or more in 10 minutes, or operation conditions violated (Speed/Gear teeth ratio). Remedy:
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| E4.1 Parameter setting range error warning | Cause: A parameter was set out of range with the servo system controller. Remedy:
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| E6.1 Forced stop warning | Cause: (1) EM2/EM1 (Forced stop) turned off. (2) External 24V DC not inputted. (3) Servo amplifier malfunctioning. Remedy:
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| E7.1 Controller forced stop input warning | Cause: (1) Forced stop signal from controller inputted. (2) Alarm occurred in another servo amplifier. (3) Forced stop signal inputted via communications (Modbus/CC-Link). Remedy:
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| E8.1 Decreased cooling fan speed warning | Cause: (1) Foreign matter caught in fan. (2) Cooling fan reached end of life. Remedy:
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| E9.1 Servo-on signal on during main circuit off | Cause: (1) Bus voltage less than 215 V DC. (2) Servo amplifier malfunctioning. Remedy:
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| E9.2 Bus voltage drop during low speed operation | Cause: Bus voltage dropped while servo motor rotating at 50 r/min or less. Remedy:
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| EC.1 Overload warning 2 | Cause: Load is too large or capacity is not enough (operation over rated output repeated). Remedy:
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| ED.1 Output watt excess warning | Cause: Output wattage (speed x torque) exceeds 120% of rated output continuously. Remedy:
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| F0.1 Instantaneous power failure tough drive warning | Cause: The power supply voltage dropped. Remedy:
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| F0.3 Vibration tough drive warning | Cause: Machine resonance suppression filter value changed frequently. Remedy:
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| F2.1 Drive recorder – Area writing time-out | Cause: The Flash-ROM is malfunctioning. Remedy:
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| F2.2 Drive recorder – Data miswriting | Cause: Data not written to drive recorder area. Remedy:
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| F3.1 Oscillation detection warning | Cause: Oscillation detected. Remedy:
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| F4.4 Target position setting range error | Cause: Target position set out of range. Remedy:
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| F4.6 Acceleration time constant setting error | Cause: Acc/Decel time constant set out of range. Remedy:
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| F4.8 Control command input error | Cause: Unit set to degree and relative position command inputted. Remedy:
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| F4.9 Home position return type error | Cause: Home position return type set out of range ([Pr. PT45]). Remedy:
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| F5.1 Cam data – Area writing time-out | Cause: Flash-ROM malfunctioning. Remedy:
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| F5.2 Cam data – Miswriting | Cause: Cam data was not written correctly. Remedy:
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| F5.3 Cam data checksum error | Cause: (1) Checksum mismatch after power cycle. (2) Checksum mismatch after temporal writing. (3) Flash-ROM malfunctioning. Remedy:
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| F6.1 Cam axis one cycle current value restoration failed | Cause: Feed current value outside stroke in reciprocating motion pattern. Remedy:
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| F6.2 Cam axis feed current value restoration failed | Cause: Difference between restored value and command position is bigger than “in-position range”. Remedy:
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| F6.3 Cam unregistered error | Cause: (1) Cam data never written. (2) Specific Cam No. not written. (3) Cam data changed due to malfunction. Remedy:
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| F6.6 Cam control inactive | Cause: (1) Power not cycled after writing data. (2) Cam control command turned on during servo-on. (3) Cam control command turned on while motor driving. (4) Home position return incomplete. (5) Servo-off occurred during cam control. (6) Home position erased. (7) Stopped at software limit. (8) Stopped at stroke limit. Remedy:
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| AA The display shows “AA” | Cause: (1) Servo system controller power off. (2) SSCNET III cable disconnected. (3) Previous axis servo amplifier power off. (4) Amplifier-less operation enabled. Remedy:
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| Ab The display shows “Ab” | Cause: (1) Incompatible controller connected. (2) Axis No. setting incorrect. (3) Communication cycle mismatch. (4) SSCNET III cable disconnected. (5) Servo amplifier malfunctioning. Remedy:
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| b## The display shows “b##” (Test Mode) | Cause: The test operation mode is enabled ([Pr. PC05] or [Pr. PC60]). Remedy:
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| dEF The display shows “dEF” | Cause: Initializing point table/program ([Pr. PT34] = 5001). Remedy:
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| Display Off The display turned off | Cause: (1) External I/O terminal shorted (CN1, CN2, CN3). (2) Power not inputted. (3) Power supply voltage dropped. Remedy:
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| Motor Issue The servo motor does not operate | Cause: (1) Wiring U/V/W incorrect. (2) Encoder cable connected to wrong axis. (3) System in test operation mode. (4) Motor-less operation enabled. (5) Torque limit enabled or load too large. Remedy:
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