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  1. Home
  2. Fault Codes
  3. Fanuc αi
F

Fanuc αi Fault Codes & Alarms

All 139 codes. Fanuc αi servo (SV) and spindle (SP) alarms for Series 30i, 31i, 32i and 0i-D, with the matching amplifier display code and the 16i / 18i / 21i / 0i alarm number.

Fanuc αi fault codes
CodeNameAreaGuide
SV0361Pulsecoder phase error (built-in)Pulsecoder (encoder) / feedback
SV0364Soft phase alarm (built-in)Pulsecoder (encoder) / feedback
SV0365LED error (built-in)Pulsecoder (encoder) / feedback
SV0366Pulse error (built-in)Pulsecoder (encoder) / feedback
SV0367Count error (built-in)Pulsecoder (encoder) / feedback
SV0368Serial data error (built-in)Pulsecoder (encoder) / feedbackFull guide
SV0369Data transfer error (built-in)Pulsecoder (encoder) / feedback
SV0380LED error (separate)Pulsecoder (encoder) / feedback
SV0381Pulsecoder phase error (separate)Pulsecoder (encoder) / feedback
SV0382Count error (separate)Pulsecoder (encoder) / feedback
SV0383Pulse error (separate)Pulsecoder (encoder) / feedback
SV0384Soft phase alarm (separate)Pulsecoder (encoder) / feedback
SV0385Serial data error (separate)Pulsecoder (encoder) / feedback
SV0386Data transfer error (separate)Pulsecoder (encoder) / feedback
SV0387Sensor error (separate)Pulsecoder (encoder) / feedback
SV0401V ready offCNC servo monitoringFull guide
SV0417Invalid servo parameterCNC servo monitoring
SV0421Excessive semi-full errorCNC servo monitoring
SV0430Servo motor overheatCNC servo monitoring
SV0431Converter: main circuit overloadPower supply (PSM)
SV0432Converter: control power supply undervoltagePower supply (PSM)
SV0433Converter: DC link undervoltagePower supply (PSM)Full guide
SV0434Inverter: control power supply undervoltageServo amplifier (SVM)
SV0435Inverter: DC link undervoltageServo amplifier (SVM)
SV0436Soft thermal (OVC)CNC servo monitoringFull guide
SV0437Converter: input circuit overcurrentPower supply (PSM)
SV0438Inverter: motor current alarmServo amplifier (SVM)Full guide
SV0439Converter: DC link overvoltagePower supply (PSM)
SV0440Converter: Excessive deceleration powerPower supply (PSM)
SV0441Current offset errorCNC servo monitoring
SV0442Converter: DC link precharge failurePower supply (PSM)Full guide
SV0443Converter: cooling fan stoppedPower supply (PSM)Full guide
SV0444Inverter: internal cooling fan stoppedServo amplifier (SVM)Full guide
SV0445Soft disconnection alarmPulsecoder (encoder) / feedback
SV0447Hard disconnection alarm (separate)Pulsecoder (encoder) / feedback
SV0448Feedback mismatch alarmCNC servo monitoring
SV0449Inverter: IPM alarmServo amplifier (SVM)Full guide
SV0453α Pulsecoder soft disconnectionPulsecoder (encoder) / feedback
SV0600Inverter: DC link current alarmServo amplifier (SVM)
SV0601Inverter: cooling fan stopped of the radiatorServo amplifier (SVM)
SV0602Inverter: overheatServo amplifier (SVM)
SV0603Inverter: IPM alarm (OH)Servo amplifier (SVM)
SV0604Communication error between amplifiersServo amplifier (SVM)
SV0605Converter: Excessive regenerative powerPower supply (PSM)
SV0606Converter: cooling fan stopped of the radiatorPower supply (PSM)
SV0607Open phase in the converter main power supplyPower supply (PSM)
SV0654DB relay errorCNC servo monitoring
SP9001Motor overheatSpindle amplifier (SPM)
SP9002Excessive speed deviationSpindle amplifier (SPM)
SP9003DC link fuse blownSpindle amplifier (SPM)
SP9004Open phase in the converter main power supplyPower supply (PSM)
SP9006Temperature sensor disconnectedSpindle amplifier (SPM)
SP9007Excessive speedSpindle amplifier (SPM)
SP9009Main circuit overload/IPM overheatSpindle amplifier (SPM)Full guide
SP9010Low power supply input voltageSpindle amplifier (SPM)
SP9011Converter: DC link overvoltagePower supply (PSM)
SP9012DC link overcurrent/IPM alarmSpindle amplifier (SPM)Full guide
SP9014Amplifier ID not registeredSpindle amplifier (SPM)
SP9015Output switching/spindle switching alarmSpindle amplifier (SPM)
SP9016RAM errorSpindle amplifier (SPM)
SP0017Amplifier ID data errorSpindle amplifier (SPM)
SP9021Position sensor polarity setting incorrectSpindle amplifier (SPM)
SP9022Spindle amplifier current overloadSpindle amplifier (SPM)
SP9027Position coder disconnectedSpindle amplifier (SPM)
SP9029Short-period overloadSpindle amplifier (SPM)
SP9030Overcurrent in the converter input circuitPower supply (PSM)
SP9031Motor lock alarmSpindle amplifier (SPM)
SP9032Serial communication LSI RAM errorSpindle amplifier (SPM)
SP9033Converter: DC link precharge failurePower supply (PSM)
SP9034Parameter data out of the specifiable rangeSpindle amplifier (SPM)
SP9035Gear ratio parameter errorSpindle amplifier (SPM)
SP9036Error counter overflowSpindle amplifier (SPM)
SP9037Speed detector parameter errorSpindle amplifier (SPM)
SP9041Position coder one-rotation signal detection errorSpindle amplifier (SPM)
SP9042Position coder one-rotation signal not detectedSpindle amplifier (SPM)
SP9043Position coder signal for differential speed mode disconnectedSpindle amplifier (SPM)
SP9046Position sensor one-rotation signal detection error during thread cuttingSpindle amplifier (SPM)
SP9047Position coder signal errorSpindle amplifier (SPM)
SP9049Overflow of converted motor speed for differential spindle speed controlSpindle amplifier (SPM)
SP9050Excessive speed command calculation value in spindle synchronizationSpindle amplifier (SPM)
SP9051Converter: DC link undervoltagePower supply (PSM)
SP9052ITP signal error ISpindle amplifier (SPM)
SP9053ITP signal error IISpindle amplifier (SPM)
SP9054Current overload alarmSpindle amplifier (SPM)
SP9055Abnormal switching status of power leadsSpindle amplifier (SPM)
SP9056Internal cooling fan stoppedSpindle amplifier (SPM)
SP9057Converter: excessive deceleration powerPower supply (PSM)
SP9058Converter: main circuit overloadPower supply (PSM)
SP9059Converter: cooling fan stoppedPower supply (PSM)
SP9061Excessive semi-closed loop/closed loop position error alarmSpindle amplifier (SPM)
SP9065Abnormal travel distance in magnetic pole determination operationSpindle amplifier (SPM)
SP9066Communication alarm between spindle and amplifierSpindle amplifier (SPM)
SP9067Reference position return command in the EGB modeSpindle amplifier (SPM)
SP9069Safety speed exceededSpindle amplifier (SPM)
SP9070Abnormal axis dataSpindle amplifier (SPM)
SP9071Abnormal safety parameterSpindle amplifier (SPM)
SP9072Motor speed mismatchSpindle amplifier (SPM)
SP9073Motor sensor disconnectedSpindle amplifier (SPM)Full guide
SP9074CPU test alarmSpindle amplifier (SPM)
SP9075CRC test alarmSpindle amplifier (SPM)
SP9076Safety function not executedSpindle amplifier (SPM)
SP9077Axis number mismatchSpindle amplifier (SPM)
SP9078Safety parameter mismatchSpindle amplifier (SPM)
SP9079Abnormal initial test operationSpindle amplifier (SPM)
SP9080Destination amplifier error in inter-spindle amplifier communicationSpindle amplifier (SPM)
SP9081Motor sensor one-rotation signal detection errorSpindle amplifier (SPM)
SP9082Motor sensor one-rotation signal not detectedSpindle amplifier (SPM)
SP9083Motor sensor signal errorSpindle amplifier (SPM)
SP9084Spindle sensor disconnectedSpindle amplifier (SPM)
SP9085Spindle sensor one-rotation signal detection errorSpindle amplifier (SPM)
SP9086Spindle sensor one-rotation signal not detectedSpindle amplifier (SPM)
SP9087Spindle sensor signal errorSpindle amplifier (SPM)
SP9088Cooling fan stopped of the radiatorSpindle amplifier (SPM)
SP9089Sub module SM (SSM) errorSpindle amplifier (SPM)
SP9090Unexpected rotation alarmSpindle amplifier (SPM)
SP9091Pole position count miss alarmSpindle amplifier (SPM)
SP9092Velocity command-dependent overspeed alarmSpindle amplifier (SPM)
SP9110Communication error between amplifiersSpindle amplifier (SPM)
SP9111Converter: control power supply low voltagePower supply (PSM)
SP9112Converter: excessive regenerative powerPower supply (PSM)
SP9113Converter: cooling fan stopped of the radiatorPower supply (PSM)
SP9120Communication data alarmSpindle amplifier (SPM)
SP9121Communication data alarmSpindle amplifier (SPM)
SP9122Communication data alarmSpindle amplifier (SPM)
SP9123Spindle switching circuit errorSpindle amplifier (SPM)
SP9124Invalid learning control velocity commandSpindle amplifier (SPM)
SP9125Invalid dynamic characteristic compensation degreeSpindle amplifier (SPM)
SP9127Invalid learning cycleSpindle amplifier (SPM)
SP9128Excessive speed deviation alarm in spindle synchronizationSpindle amplifier (SPM)
SP9129Excessive position error alarm in spindle synchronizationSpindle amplifier (SPM)
SP9130Speed polarity error in torque tandem operationSpindle amplifier (SPM)
SP9131Spindle adjustment function alarmSpindle amplifier (SPM)
SP9132Serial data errorSpindle amplifier (SPM)
SP9133Data transfer errorSpindle amplifier (SPM)
SP9134Soft phase alarmSpindle amplifier (SPM)
SP9137Device communication errorSpindle amplifier (SPM)
SP9139Pulse error alarmSpindle amplifier (SPM)
SP9140Count error alarmSpindle amplifier (SPM)
SP9141Serial sensor one-rotation signal not detectedSpindle amplifier (SPM)
Showing 60 of 139 codes

Codes and names from the FANUC αi series Maintenance Manual. Guides written and reviewed by AutomIQ repair technicians.

Fanuc αi repair

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Fanuc αi fault guides

  • SV0368Serial data error (built-in)
  • SV0401V ready off
  • SV0433Converter: DC link undervoltage
  • SV0436Soft thermal (OVC)
  • SV0438Inverter: motor current alarm
  • SV0442Converter: DC link precharge failure
  • SV0443Converter: cooling fan stopped
  • SV0444Inverter: internal cooling fan stopped
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Drives hold dangerous voltage after power-off. Checks should only be done by qualified personnel, with power isolated and the DC link discharged.

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Fault codes
2,364 explained
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