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Fanuc 16i/18i/21i CNC

Fanuc 16i/18i/21i CNC Error Codes

Complete alarm and error code reference for the Fanuc 16i/18i/21i CNC. Browse all 360 documented fault codes below, each linking to a detailed troubleshooting guide.

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Complete Alarm List (Page 2 of 2)

SERVO ALARM: n–TH AXIS VRDY OFF

SERVO ALARM: SV CARD NOT EXIST

SERVO ALARM: CARD/SOFT MISMATCH

SERVO ALARM: n–TH AXIS VRDY ON

SERVO ALARM: (ZERO POINT RETURN FAULT)

SERVO ALARM: EXCESS ERROR

SERVO ALARM: n AXIS TORQUE ALM

SERVO ALARM: n–TH AXIS EXCESS ERROR

SERVO ALARM: n–TH AXIS EXCESS ERROR

SERVO ALARM: n–th AXIS – LSI OVERFLOW

SERVO ALARM: n–TH AXIS EXCESS SHIFT

SERVO ALARM: n–TH AXIS PARAMETER INCORRECT

SERVO ALARM: n AXIS SYNC TORQUE

SERVO ALARM: n AXIS EXCESS ER (D)

SERVO ALARM: n AXIS

SERVO ALARM: n AXIS

n AXIS: SV. MOTOR OVERHEAT

n AXIS: CNV. OVERLOAD

n AXIS: CNV. LOW VOLT CONTROL

n AXIS: CNV. LOW VOLT DC LINK

n AXIS: INV. LOW VOLT CONTROL

n AXIS: INV. LOW VOLT DC LINK

n AXIS: SOFTTHERMAL (OVC)

n AXIS: CNV. OVERCURRENT POWER

n AXIS: INV. ABNORMAL CURRENT

n AXIS: CNV. OVER VOLT DC LINK

n AXIS: CNV. EX DECELERATION POW.

n AXIS: ABNORMAL CURRENT OFFSET

n AXIS: CNV. CHARGE FAILURE

n AXIS: CNV. COOLING FAN FAILURE

n AXIS: INV. COOLING FAN FAILURE

n AXIS: SOFT DISCONNECT ALARM

n AXIS: HARD DISCONNECT ALARM

n AXIS: HARD DISCONNECT (EXT)

n AXIS: UNMATCHED FEEDBACK ALARM

n AXIS: INV. IPM ALARM

n AXIS: SPC SOFT DISCONNECT ALARM

n AXIS: ILLEGAL CURRENT LOOP

n AXIS: ILLEGAL HI HRV (250US)

n AXIS: CURRENT LOOP ERROR

n AXIS: HI HRV SETTING ERROR

n AXIS: FSSB DISCONNECT

n AXIS: ILLEGAL AMP INTERFACE

n AXIS: SEND CNC DATA FAILED

n AXIS: SEND SLAVE DATA FAILED

n AXIS: WRITE ID DATA FAILED

n AXIS: READ ID DATA FAILED

n AXIS: MOTOR/AMP COMBINATION

n AXIS: ILLEGAL SETTING OF AXIS

n AXIS: HI HRV SETTING ERROR (AMP)

OVER TRAVEL: +n

OVER TRAVEL: –n

OVER TRAVEL: +n

OVER TRAVEL: –n

OVER TRAVEL: +n

OVER TRAVEL: –n

n AXIS: INV. DC LINK OVER CURRENT SVM:

n AXIS: INV. RADIATOR FAN FAILURE SVM:

n AXIS: INV. OVERHEAT SVM:

n AXIS: INV. IPM ALARM (OH) SVM:

n AXIS: AMP. COMMUNICATION ERROR

n AXIS: CNV. EX. DISCHARGE POW. PSMR:

n AXIS: CNV. RADIATOR FAN FAILURE PSM:

n AXIS: CNV. SINGLE PHASE FAILURE PSM:

OVERHEAT: CONTROL UNIT

OVERHEAT: FAN MOTOR

RIGID TAP ALARM: EXCESS ERROR

RIGID TAP ALARM: EXCESS ERROR

RIGID TAP ALARM: LSI OVER FLOW

S–SPINDLE LSI ERROR

SPINDLE SERIAL LINK START FAULT

FIRST SPINDLE MODE CHANGE FAULT

SPINDLE–1 ABNORMAL TORQUE ALM

SECOND SPINDLE MODE CHANGE FAULT

SPINDLE–2 ABNORMAL TORQUE ALM

SPN_n_: MOTOR OVERHEAT

SPN_n_: EX SPEED ERROR

SPN_n_: FUSE ON DC LINK BLOWN

SPN_n_: INPUT FUSE/ POWER FAULT

SPN_n_: THERMAL SENSOR DISCONNECT

SPN_n_: OVERSPEED

SPN_n_: OVERHEAT MAIN CIRCUIT

SPN_n_: OVERVOLT POW CIRCUIT

SPN_n_: OVERCURRENT POW CIRCUIT

SPN_n_: SP SWITCH CONTROL ALARM

SPN_n_: RAM FAULT

SPN_n_: SUMCHECK ERROR PGM DATA

SPN_n_: EX OFFSET CURRENT U

SPN_n_: EX OFFSET CURRENT V

SPN_n_: POS SENSOR POLARITY ERROR

SPN_n_: SERIAL TRANSFER ERROR

SPN_n_: DISCONNECT C–VELO DETECT

SPN_n_: DISCONNECT POS–CODER

SPN_n_: DISCONNECT C–POS DETECT

SPN_n_: SHORTTIME OVERLOAD

SPN_n_: OVERCURRENT POW CIRCUIT

SPN_n_: MOTOR LOCK OR V–SIG LOS

SPN_n_: RAM FAULT SERIAL LSI

SPN_n_: SHORTAGE POWER CHARGE

SPN_n_: PARAMETER SETTING ERROR

SPN_n_: EX SETTING GEAR RATIO

SPN_n_: OVERFLOW ERROR COUNTER

SPN_n_: SPEED DETECT PAR. ERROR

SPN_n_: 1–ROT POSCODER ERROR

SPN_n_: NO 1–ROT. POS–CODER DETECT

SPN_n_: DISCON. PC FOR DIF. SP. MODE

SPN_n_: CONTROL CIRCUIT(AD) ERROR

SPN_n_: SCREW 1–ROT POSCOD. ALARM

SPN_n_: POS–CODER SIGNAL ABNORMAL

SPN_n_: HIGH CONV. DIF. SPEED

SPN_n_: SPNDL CONTROL OVERSPEED

SPN_n_: LOW VOLT DC LINK

SPN_n_: ITP SIGNAL ABNORMAL I

SPN_n_: ITP SIGNAL ABNORMAL II

SPN_n_: OVERLOAD CURRENT

SPN_n_: POWER LINE SWITCH ERROR

SPN_n_: INNER COOLING FAN STOP

SPN_n_: EX DECELERATION POWER

SPN_n_: OVERLOAD IN PSM

SPN_n_: COOLING FAN STOP IN PSM

SPN_n_: MOTOR VCMD OVERFLOWED

SPN_n_: AMP MODULE COMMUNICATION

SPN_n_: MOTOR SENSOR DISCONNECTED

SPN_n_: CPU TEST ERROR

SPN_n_: CRC ERROR

SPN_n_: INITIAL TEST ERROR

SPN_n_: 1–ROT MOTOR SENSOR ERROR

SPN_n_: NO 1–ROT MOTOR SENSOR

SPN_n_: MOTOR SENSOR SIGNAL ERROR

SPN_n_: SPNDL SENSOR DISCONNECTED

SPN_n_: 1–ROT SPNDL SENSOR ERROR

SPN_n_: NO 1–ROT SPNDL SENSOR ERROR

SPN_n_: SPNDL SENSOR SIGNAL ERROR

SPN_n_: COOLING RADIFAN FAILURE

SRAM PARITY: (BYTE 0)

SRAM PARITY: (BYTE 1)

DRAM PARITY: (BYTE 0)

DRAM PARITY: (BYTE 1)

DRAM PARITY: (BYTE 2)

DRAM PARITY: (BYTE 3)

DRAM PARITY: (BYTE 4)

DRAM PARITY: (BYTE 5)

DRAM PARITY: (BYTE 6)

DRAM PARITY: (BYTE 7)

SERVO ALARM (1 to 4 AXIS)

PMC SYSTEM ALARM

PMC–RC WATCH DOG ALARM

NMI OCCURRED IN PMCLSI

NMI OCCURRED IN SLC

NMI OCCURRED IN OTHER MODULE

NON MASK INTERRUPT

BUS ERROR (MAIN)

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