FANUC Series 16i, 18i, 21i Alarms
Fanuc Series 16i, 18i, 21i Alarms, Error Codes
Fanuc Series 16i, 18i and 21i Alarms. Please contact us if you need testing, a repair or an exchange part. Or please visit our dedicated Fanuc Series 16i, 18i, 21i Page. These alarm codes relate to both Model A & B. NB: * denotes model B additional alarms. Back to Fanuc Alarms, Error Codes indexBackground Edit Alarm
| Alarm Code | Type | Description of Alarms/ Faults |
| ??? | BP/S alarm | BP/S alarm occurs in the same number as the P/S alarm that occurs in ordinary program edit. |
| 140 | BP/S alarm | It was attempted to select or delete in the background a program being selected in the foreground ( note) |
| Alarm Code | Type | Description of Alarms/ Faults |
| 300* | nth axis origin return | Manual reference position return is required for the nth-axis (n=1-8) |
| 301* | APC alarm: nth axis communication | nth axis (n=1-8) APC communication error. Failure in data transmission. |
| 302* | APC alarm: nth axis over time | nth axis( n=1-8) APC overtime error. Failure in data transmission. |
| 303* | APC alarm: nth axis framing | nth axis (n=1-8) APC framing error. Failure in Data transmission. |
| 304* | APC alarm: nth axis parity | nth axis (n=1-8) APC parity error. Failure in Data transmission. |
| 305* | APC alarm:nth axis pulse error | nth axis (n=1-8) APC pulse error alarm. |
| 306* | APC alarm: nth axis battery voltage 0 | nth axis (n=1-8) APC battery voltage has decreased to a low level so that the data cannot be held. |
| 307* | APC alarm: nth axis battery low 1 | nth axis (n=1-8) APC battery voltage reaches a level where the battery must be renewed. |
| 308* | APM alarm: nth-axis battery low 2 | nth axis (n=1-8) APC battery voltage has reached a level where the battery must be renewed ( including when the power is OFF). |
| 309* | APC ALARM: n AXIS ZRN IMPOSSIBLE | Return to the origin has been attempted without first rotating the motor one or more times. |
| Alarm Code | Type | Description of Alarms/ Faults |
| 360 | n-AXIS: ABNORMAL CHECKSUM (INT) | A checksum error occured in the built in pulse coder. |
| 361 | n-AXIS: ABNORMAL PHASE DATA (INT) | A phase data error occured in the built in pulse coder. |
| 362 | n-AXIS: ABNORMAL REV.DATA (INT) | A rotation speed count error occured in the built in pulse coder. |
| 363 | n-AXIS: ABNORMAL CLOCK (INT) | A clock error occured in the built in pulse coder. |
| 364 | n-AXIS: SOFT PHASE ALARM(INT) | The digital servo software detected invalid data in the built in pulse coder. |
| 365 | n-AXIS: BROKEN LED (INT) | An LED error occured in the built in pulse coder. |
| 366 | n-AXIS: PULSE MISS (INT) | A pulse error occured in the built in pulse coder. |
| 367 | n-AXIS: COUNT MISS (INT) | A count error occured in the built in pulse coder. |
| 368 | n-AXIS: SERIAL DATA ERROR (INT) | Communication data from the built in pulse coder cannot be received. |
| 369 | n-AXIS: DATA TRANS; ERROR (INT) | A CRC or stop bit error occured in the communication data being received from the built in pulse coder. |
| 380 | n-AXIS: BROKEN LED (EXT) | The seperate detector is erroneous. |
| 381 | n-AXIS: ABNORMAL PHASE (EXT) | A phase data error occured in the seperate linear scale. |
| 382 | n-AXIS: COUNT MISS (EXT) | A pulse error occured in the seperate detector. |
| 383 | n-AXIS: PULSE MISS (EXT) | A count error occured in the seperate detector. |
| 384 | n-AXIS: SOFT PHASE ALARM(EXT) | The digital servo software detected invalid data in the seperate detector. |
| 385 | n-AXIS: SERIAL DATA ERROR (EXT) | Communication data from the seperate detector cannot be received. |
| 386 | n-AXIS: DATA TRANS. ERROR(EXT) | A CRC or stop bit error occured in the communication data being received from the seperate detector. |
| 387* | n-AXIS: ABNORMAL ENCODER ( EXT) | An error occurs in the seperate detector. |
| Alarm Code | Type | Description of Alarms/ Faults |
| 401 | SERVO ALARM: n-TH AXIS VRDY OFF | The n-th axis (axis 1-8) servo amplifier READY signal (DRDY) went off. |
| 402 | SERVO ALARM: SV CARD NOT EXIST | The axis control card is not provided. |
| 403 | SERVO ALARM: CARD/SOFT MISMATCH | The combination of the axis control card and servo software is illegal. |
| 404 | SERVO ALARM: n-TH AXIS VRDY ON | Even though the n-th axis ( axis 1-8) READY signal (MCON) went off the servo amplifier READY signal (DRDY) is still on. Or when the power was turned on, DRDY went on even though MCON was off. |
| 405 | SERVO ALARM: (ZERO POINT RETURN FAULT) | Position control system fault. Due to an NC or servo system fault in the reference positon return, there is a possibility that the reference position return could not be executed properly. |
| 407 | SERVO ALARM: EXCESS ERROR | The difference in synchronous axis position deviation exceeded the set value. |
| 409 | SERVO ALARM: n XIS TORQUE ALARM | Abnormal servo motor load has been detected. Alternatively, abnormal spindle motor load has been detected in Cs mode. |
| 410 | SERVO ALARM: n-TH AXIS-EXCESS ERROR | The position deviation value when the n-th axis ( axis 1-8) stops is larger than the set value. |
| 411 | SERVO ALARM: n-TH AXIS- EXCESS OVERFLOW | The position deviation value when the n-th axis ( axis 1-8) moves is larger than the set value. |
| 413 | SERVO ALARM: n-th AXIS- LSI OVERFLOW | The contents of error register for the n-th axis ( axis 1-8) exceeded power. |
| 415 | SERVO ALARM: n-AXIS: EXCESS SHIFT | A speed higher than 524288000 units/s was attempted to be set in the n-th axis (axis 1-8). |
| 417 | SERVO ALARM: n-AXIS: PARAMETER INCORECT | This alarm occurs when the n-th axis is in one of the below states: (digital servo system alarm).
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| 420 | SERVO ALARM: n-AXIS: SYNC TORQUE( M axis) | During simple synchronous control, the difference between the torque commands for the master and slave axes exceeded the value set in parameter no 2078 and2079. |
| 421 | SERVO ALARM: n-AXIS: EXCESSer (D) | The difference between the errors in the semi closed loop and closed loop has become excessive during the dual position feedback. |
| 422 | SERVO ALARM: n-AXIS | In torque control of PMC axis control, a specified allowable speed has been executed. |
| 423 | SERVO ALARM: n-AXIS | In torque control of PMC axis control, the parameter set allowable cumulative travel distance has been executed. |
| 430 | n AXIS: SV.MOTOR OVERHEAT | A servo motor overheat occured. |
| 431 | n AXIS: CNV. OVERLOAD | 1. PSM : Overheat occured. 2. Beta series SVU: Overhead occured. |
| 432 | n AXIS: CNV.LOWVOLT CON./POWFAULT | 1. PSM: Phase missing occured in the input voltage 2. PMSR: The control power supply voltage has dropped. 3. Alpha Series SVU: The control power supply voltage has dropped. |
| 433 | n AXIS: CNV: LOW VOLT DC LINK |
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| 434 | n AXIS: INV. LOW VOLT CONTROL | SVM: The control power supply voltage has dropped. |
| 435 | n AXIS: INV. LOW VOLT DC LINK | SVM: The DC Link Voltage has dropped. |
| 436 | n AXIS: SOFTTHERMAL (OVC) | The digital servo software detected the soft thermal state (OVC). |
| 437 | n AXIS: OVERCURRENT POWER | PSM: Overcurrent flowed into the input circuit. |
| 438 | n AXIS: INV: ABNORMAL CURRENT | 1. SVM: The motor current is too high 2. Alpha series: The motor current is too high. 3. Beta series. The motor current is too high. |
| 439 | n AXIS:CNV. OVERVOLT POWER | 1. PSM: The DC voltage is too high. 2. PSMR: The DC voltage is too high. 3. Alpha series SVU: The C link voltage is too high. 4. Beta serie SVU: The link voltage is too high. |
| 440 | n AXIS:CNV. EX DECELERATION POW. | 1. PSMR: The regeneration discharge amount is too large. 2. Alpha series SVU: The regeneration discharge amount is too large. Alternatively, the regeneration discharge ciruit is abnormal. |
| 441 | n AXIS: ABNORMAL CURRENT OFFSET | The digital servo software detected an abnormality in the motor current detection circuit. |
| 442 | n AXIS: CNV. CHARGE FAULT/INV DB | 1. PSM. The spare discharge circuit of the DC link is abnormal. 2. PSMR: The spare discharge circuit of the DC link is abnormal. 3. Alpha series SVU: The dynamic brake cicruit is abnormal. |
| 443 | n AXIS: COOLING FAN FAILURE | 1. PSM: The internal stirring fan failed. 2. PSMR: The internal stirring fan failed. 3. Beta series SVU: The internal stirring fan failed. |
| 444 | n AXIS: COOLING FAN FAILURE | SVM: The internal stirring fan failed. |
| 445 | n AXIS: SOFT DISCONNECT ALARM | The digital servo software detected a broken wire in the pulse coder. |
| 446 | n AXIS: HARD DISCONNECT ALARM | A broken wire in the built in pulse coder was detected by hardware. |
| 447 | n AXIS: HARD DISCONNECT (EXT) | A broken wire in the seperate detector was detected by hardware. |
| 448 | n AXIS: UNMATCHED FEEDBACK ALARM | The sign of feedback data from the built in pulse coder differs from that of a feedback data from the seperate detector. |
| 449 | n AXIS: INV. IPM ALARM | 1. SVM: IPM ( intelligent power module) detected an alarm. 2. Alpha series SVU: IPM ( intelligent power module) detected an alarm. |
| 453* | n AXIS: SPC SOFT DISCONNECT ALARM | Software disconnection alarm of the a pulse coder. |
| 460 | n AXIS: FSSB DISCONNECT | FSSB communication was disconnected suddenly. The possible causes are as follows: 1. The FSSB communication cable was disconnected or broken. 2. The power to the amplifier was turned off suddenly. 3. A low voltage alarm was issued by the amplifier. |
| 461 | n AXIS: ILLEGAL AMP INTERFACE | The axes of the 2- axis amplifier were assigned to the fast type interface. |
| 462 | n AXIS: SEND CNC DATA FAILED | Because of an FSSB communication error, a slave could not receive correct data. |
| 463 | n AXIS: SEND SLAVE DATA FAILED | Because of an FSSB communication error, the servo system could not receive correct data. |
| 464 | n AXIS: WRITE ID DATA FAILED | An attempt was made to write maintenance informatio on the amplifier maintenance screen but it failed. |
| 465 | n AXIS: READ ID DATA FAILED | At power up, amplifier initial ID information could not be read. |
| 466 | n AXIS: MOTOR/AMP COMBINATION | The maximum current rating for the amplifer does not match that for the motor. |
| 467 | n AXIS: ILLEGAL SETTING OF AXIS | The servo function for the following has not been enabled when an axis occupying a single DSP ( corresponding to two ordinary axes) is specified on the axis setting screen.
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| Alarm Code | Type | Description of Fault/Error |
| 500 | OVER TRAVEL | Exceeded the n-th axis (axis 1-8) + side stored stroke check I. |
| 501 | OVER TRAVEL | Exceeded the n-th axis (axis 1-8) – side stored stroke check I. |
| 502 | OVER TRAVEL | Exceeded the n-th axis (axis 1-8) +side stored stroke check II. |
| 503 | OVER TRAVEL | Exceeded the n-th axis (axis 1-8) – side stored stroke check II. |
| 504 | OVER TRAVEL | Exceeded the n-th axis (axis 1-8) +side stored stroke check III |
| 505 | OVER TRAVEL | Exceeded the n-th axis (axis 1-8) – side stored stroke check III |
| 506 | OVER TRAVEL | Exceeded the n-th axis (axis 1-8) + side hardware OT. |
| 507 | OVER TRAVEL | Exceeded the n-th axis (axis 1-8) – side hardware OT. |
| 508 | INTERFERENCE | A tool moving in the positive direction along the n axis has fouled another tool post. |
| 509 | INTERFERNECE | A tool moving in the negative direction along the n axis has fouled another tool post. |
| 510 | OVER TRAVEL | Alarm for stroke check prior to movement. The end point specified in a block falls within the forbidden area defined with the stroke check in the positive direction along the N axis. |
| 511 | OVER TRAVEL | Alarm for stroke check prior to movement. The end point specified in a block falls within the forbidden area defined with the stroke check in the negative direction along the N axis. |
| Alarm Code | Type | Description of Fault/Error |
| 700 | OVERHEAT: CONTROL UNIT | Control unit overheat. |
| 701 | OVERHEAT: FAN MOTOR | The fan motor on top of the cabinet for the control unit is overheated. |
| 704 | OVERHEAT: SPINDLE | Spindle overheat in the spindle fluctuation detection . |
| Alarm Code | Type | Description of Fault/Error |
| 740 | RIGID TAP ALARM: EXCESS ERROR | The positional deviation of the stopped spindle has exceeded the set value during rigid tapping. |
| 741 | RIGID TAP ALARM: EXCESS ERROR | The positional deviation of the moving spindle has exceeded the set value during rigid tapping. |
| 742 | RIGID TAP ALARM: LSI OVERFLOW | An LSI overflow has occurred for the spindle during rigid tapping. |
| Alarm Code | Type | Description of Fault/Error |
| 749 | S-SPINDLE LSI ERROR | It is serial communication error while system is executing after power supply is on. |
| 750 | SPINDLE SERIAL LINK START FAULT | This alarm is generated when the spindle control unit is not ready for starting correctly when the power is turned on in the system with the serial spindle. |
| 752 | FIRST SPINDLE MODE CHANGE FAULT | This alarm is generated if the system does not properly terminate a mode change. The modes include the Cs contouring, spindle positioning, rigid tapping and spindle control modes. |
| 754 | SPINDLE-1 ABNORMAL TORQUE | Abnormal first motor load has been detected |
| 762 | SECOND SPINDLE MODE CHANGE FAULT | Refer to alarm No 752 for the 2nd axis |
| 764 | SPINDLE-2 ABNORMAL TORQUE | Same as alarm number 754 for the second spindle |
| 772 | SPINDLE-3 MODE CHANGE ERROR | Same as alarm number 752 for the third spindle |
| 774 | SPINDLE 3 ABNORMAL TORQUE ALARM | Same as alarm number 754 for the third spindle |
| 782 | SPINDLE 4 MODE CHANGE ERROR | Same as alarm number 752 for the fourth spindle |
| 784 | SPINDLE 4 ABNORMAL TORQUE ALARM | Same as alarm number 754 for the fourth spindle |
| Alarm Code | Type | Description of Fault/Error |
| 900 | ROM PARITY | A parity error ocured in the CNC, macro, or servo ROM. |
| 910 | SRAM PARITY: (BYTE 0 ) | A RAM parity error occured in the part program storage RAM. |
| 911 | SRAM PARITY: (BYTE 1 ) | A RAM parity error occured in the part program storage RAM. |
| 912 | DRAM PARITY: (BYTE 0 ) | A RAM parity error occured in the DRAM module. |
| 913 | DRAM PARITY: (BYTE 1 ) | A RAM parity error occured in the DRAM module. |
| 914 | DRAM PARITY: (BYTE 2 ) | A RAM parity error occured in the DRAM module. |
| 915 | DRAM PARITY: (BYTE 3 ) | A RAM parity error occured in the DRAM module. |
| 916 | DRAM PARITY: (BYTE 4 ) | A RAM parity error occured in the DRAM module. |
| 917 | DRAM PARITY: (BYTE 5 ) | A RAM parity error occured in the DRAM module. |
| 918 | DRAM PARITY: (BYTE 6 ) | A RAM parity error occured in the DRAM module. |
| 919 | DRAM PARITY: (BYTE 7 ) | A RAM parity error occured in the DRAM module. |
| 920 | SERVO ALARM ( 1-4 AXIS ) | Servo alarm ( 1st to 4th axis). A watchdog alarm condition occured, or a RAM parity error occured in the axis control card. |
| 921 | SERVO ALARM ( 5-8 AXIS ) | Servo alarm ( 5th to 8th axis). A watchdog alarm condition occured, or a RAM parity error occured in the axis control card. |
| 926 | FSSB ALARM | FSSB alarm. |
| 930 | CPU INTERRUPT | CPU error (abnormal interrupt). |
| 935 | SRAM ECC ERROR | An error occured in RAM for part program storage. |
| 950 | PMC SYSTEM ALARM PCxxx YYYYYYYYYYYY | An error occured in the PMC. |
| 951 | PMC WATCH DOG ALARM | An error occured in the PMC. |
| 970 | NMI OCCURED IN PMCLSI | With the PMC-SA1, an error occured in the PMC control LSI device on the motherboard ( I/O RAM parity). |
| 971 | NMI OCCURED IN SLC | With the PMC-SA1, an I/O Link disconnection was detected. |
| 972 | NMI OCCURED IN OTHER MODULE | An NMI occured on a board other than the motherboard. |
| 973 | NON MASK INTERRUPT | An NMI occured as a result of an unknown cause. |
| 974 | F-BUS ERROR | A bus error occured on the Fanuc Bus. |
| 975 | BUS ERROR | A bus error occure don the motherboard. |
| 976 | L-BUS ERROR | A bus error occured on the local bus. |