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Servo Alarm Codes

FANUC Alarm Codes List

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Below is a list of FANUC servo amplifier alarms and faults with a short description briefly describing the source of each error code. Some point to the source of the problem itself, others point to the problem and do not identify the failing/malfunctioning component.

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Tri Star CNC Services can provide you with more information on the meaning of your alarms. We will provide a fault diagnosis and a dependable 1-year warranty if you require servo repairs or parts replacement

Fanuc Servo Amplifer Alarms

Alarm Code Description

- (dash)

 

Amplifier is not ready

0

 

Amplifier is ready (normal operating state)

1

C Series

If the DC voltage of the main circuit power supply is abnormally high, overvoltage alarm occurs.

1

 

Internal cooling circuit faulty

1

Beta

The battery voltage of the absolute pulse coder is low. (warning)

11

Beta

When the absolute pulse coder is used, the motor has not yet rotated through more than one turn after the first power–up.

2

 

Inverter: control power supply undervoltage

2

Beta

The battery voltage of the absolute pulse coder is low.

2 (dot)

C Series

+5 VDC of the control circuit power supply is abnormally low.

3

Beta

The motor has overheated (OHAL).

3

6066, 6089, 6090

DC voltage of the main circuit power supply is abnormally low or the circuit breaker is tripped.

4

6066, 6089, 6090

Regenerative discharge energy is too high.

–The regenerative discharge circuit is abnormal.

4

C Series

Regenerative control circuit abnormal.

5

 

Inverter: DC link undervoltage

5, S

Beta

A communication error for the serial pulse coder was detected.

5 (dot)

C Series

Excessive regenerative discharge alarm.

5

6066, 6089, 6090

Average regenerative discharge energy is too high(too frequent acceleration/deceleration)–The transformer overheats.

6

 

Overcurrent alarm (HCLM) in the main circuits of the L and M axes of the 2-axis amplifier.

6 (dot)

 

Inverter: overheat

7

C Series

Magnetic contractor welding alarm (MCC).

7

6066, 6089, 6090

Relay contacts for the dynamic brake is faulty.

8

 

Abnormal current alarm (L axis)

8. (dot)

 

Inverter: IPM alarm (L axis)

9

 

Abnormal current alarm (M axis)

9

Beta

Reference position setting cannot be executed normally

9. (dot)

 

Inverter: IPM alarm (M axis)

A

 

Abnormal current alarm (N axis)

A. (dot)

 

Inverter: IPM alarm (N axis)

b

 

Abnormal current alarm (L axis)

b

6066, 6089, 6090

Abnormally high current in the L–and M–axis motors

b. (dot)

6066, 6089, 6090

IPM alarm for L–and M–axis axes.

c

Beta

An overcurrent alarm or IPM alarm

C

Beta

Faulty cooling circuit

d

 

Abnormal current alarm (N axis)

E

Beta

An error was detected in the RAM write/read test at power–up.

F

 

External cooling circuit faulty

J

Beta

The regenerative discharge unit has overheated

L

 

FSSB communication error

P

 

Communication error between amplifier and module

P

Beta

DC link low voltage alarm

U

 

FSSB communication error

U

Beta

A parameter that requires power–down has been specified.

u

Beta

A first to third reference position return cannot be executed because the reference position has not yet been established.

Y

Beta

DC link overvoltage alarm

Fanuc Servo Amplifier 400 Alarm Codes

Alarm CodeMessageDescription

400

SERVO ALARM: n–TH AXIS OVERLOAD

The n–th axis (axis 1–8) overload signal is on. Refer to diagnostic display No. 201, 720 or 721 for details.

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 3, 4TH AXIS OVERLOAD

3-axis, 4-axis overload signal is on. Refer to diagnostic display 722 or 723 for details.

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.

Check that the servo interface module and servo amp are connected.

405

SERVO ALARM: (ZERO POINT RETURN

FAULT)

Position control system fault. Due to an NC or servo system fault in the reference position return, there is the possibility that reference position return could not be executed correctly. Try again from the manual reference position return.

407

SERVO ALARM: EXCESS ERROR

The difference in synchronous axis position deviation exceeded the set value.

409

SERVO ALARM: n AXIS TORQUE ALM

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

ERROR

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 the error register for the n–th axis (axis 1–8) exceeded 231 power. This error usually occurs as the result of an improperly set parameters.

414

SERVO ALARM: n–TH AXIS –

DETECTION RELATED ERROR

N–th axis (axis 1–8) digital servo system fault. Refer to diagnosis display No. 200 and No.204 for details. Also look at the servo amlifier for alarm code.

415

SERVO ALARM: n–TH AXIS – EXCESS

SHIFT

A speed higher than 511875 units/s was attempted to be set in the n–th axis (axis 1–8). This error occurs as the result of improperly set CMR.

416

SERVO ALARM: n–TH AXIS – DISCONNECTION

Position detection system fault in the n–th axis (axis 1–8) pulse coder (disconnection alarm). Refer to diagnosis display No. 201 for details.

417

SERVO ALARM: n–TH AXIS – PARAMETER

INCORRECT

This alarm occurs when the n–th axis (axis 1–8) is in one of the conditions listed below. (Digital servo system alarm)

1) The value set in Parameter No. 2020 (motor form) is out of the specified limit.

2) A proper value (111 or –111) is not set in parameter No.2022 (motor revolution direction).

3) Illegal data (a value below 0, etc.) was set in parameter No. 2023 (number of speed feedback pulses per motor revolution).

4) Illegal data (a value below 0, etc.) was set in parameter No. 2024 (number of position feedback pulses per motor revolution).

5) Parameters No. 2084 and No. 2085 (flexible field gear rate) have not been set.

6) A value outside the limit of {1 to the number of control axes} or a non–continuous value (Parameter 1023 (servo axis number) contains a value out of the range from 1 to the number of axes, or an isolated value (for example, 4 not preceded by 3).was set in parameter No. 1023 (servo axisnumber). 7) The amplifier in use does not support the HC alarm avoidance function.

If you want to use this amplifier, reset the function bit 2209#4 to 0.

If you want to use the HC alarm avoidance function, use an amplifier that supports it.

420

SERVO ALARM: n AXIS SYNC

TORQUE

(M series)

During simple synchronous control, the difference between the torque commands for the master and slave axes exceeded the value set in parameter No. 2031.

421

SERVO ALARM: n AXIS EXCESS

ER (D)

The difference between the errors in the semi–closed loop and closed loop has become excessive during dual position feedback. Check the values of the dual position conversion coefficients in parameters No. 2078 and 2079.

422

SERVO ALARM: n AXIS

In torque control of PMC axis control, a specified allowable speed has been exceeded.

423

SERVO ALARM: n AXIS

In torque control of PMC axis control, the parameter–set allowable cumulative travel distance has been exceeded.

430

n AXIS : SV. MOTOR OVERHEAT

A servo motor overheat occurred.

431

n AXIS : CNV. OVERLOAD

1) PSM: Overheat occurred.

2) β series SVU: Overheat occurred.

432

n AXIS : CNV. LOWVOLT CON.

1) PSM: The control power supply voltage has dropped.

2) PSMR: The control power supply voltage has dropped.

3) β series SVU: The control power supply voltage has dropped

434

n AXIS : INV. LOWVOLT CONTROL

SVM: The control power supply voltage has dropped.

435

n AXIS : INV. LOWVOLT 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 : CNV. OVERCURRENT POWER

PSM: Overcurrent flowed into the input circuit.

438

n AXIS : INV. ABNORMAL CURRENT

1) SVM: The motor current is too high.

2) α series SVU: The motor current is too high.

3) β series SVU: The motor current is too high.

439

n AXIS : CNV. OVERVOLT POWER

1) PSM: The DC link voltage is too high.

2) PSMR: The DC link voltage is too high.

3) α series SVU: The C link voltage is too high.

4) β series SVU: The link voltage is too high.

440

n AXIS : CNV. EX DECELERATION

POWER

1) PSMR: The regenerative discharge amount is too large.

2) α series SVU: The regenerative discharge amount is too large. Alternatively, the regenerative discharge circuit is abnormal.

441

n AXIS : ABNORMAL CURRENT

OFFSET

The digital servo software detected an abnormality in the motor currentdetection circuit.

442

n AXIS : CNV. CHARGE FAILURE

1) PSM: The spare discharge circuit of the DC link is abnormal.

2) PSMR: The spare discharge circuit of the DC link is abnormal.

443

n AXIS : CNV. COOLING FAN FAILURE

1) PSM: The internal cooling fan failed.

2) PSMR: The internal cooling fan failed.

3) β series SVU: The internal cooling fan failed.

444

n AXIS : INV. COOLING FAN FAILURE

SVM: The internal cooling 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 separate 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 feedback data from the separate detector.

449

n AXIS : INV. IPM ALARM

1) SVM: IPM (intelligent power module) detected an alarm.

2) α series SVU: IPM (intelligent power module) detected an alarm.

453

n AXIS : SPC SOFT DISCONNECT

ALARM

Software disconnection alarm of the α pulse coder. Turn off the power to the CNC, then remove and insert the pulse coder cable. If this alarm is issued again, replace the pulse coder.

456

ILLEGAL CURRENT LOOP

The current control cycle settings (parameter No. 2004, bit 0 of parameter No. 2003, and bit 0 of parameter No. 2013) are incorrect.

Possible problems are as follows.

– For the two axes whose servo axis numbers (settings of parameter No. 1023) are an odd number followed by an even number (a pair of axes 1 and 2 or axes 5 and 6, for example), a different current control cycle is set for each of the axes.

– The requirements for slaves needed for the set current control cycle, including the number, type, and connection method of them, are not satisfied.

457

ILLEGAL HI HRV (250US)

Use of high–speed HRV is specified although the current control cycle is 200 μs.

458

CURRENT LOOP ERROR

The current control cycle setting does not match the actual current control cycle.

459

HI HRV SETTING ERROR

Of two axes having adjacent servo axis numbers (parameter No. 1023), odd number and even number, high–speed HRV control can be performed for one axis and not for the other.

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, a slave could not receive correct data.

464

n AXIS : WRITE ID DATA FAILED

An attempt was made to write maintenance information 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 amplifier 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.

1. Learning control (bit 5 of parameter No. 2008 = 1)

2. High–speed current loop (bit 0 of parameter No. 2004 = 1)

3. High–speed interface axis (bit 4 of parameter No. 2005 = 1)

468

HI HRV SETTING ERROR(AMP)

Use of high–speed HRV is specified for a controlled axis of an amplifier which does not support high–speed HRV.

Fanuc Servo Amplifier 600 Alarms

Alarm CodeMessageDescription

600

n AXIS: INV. DC LINK OVER CURRENT

DC link current is too large.

601

n AXIS: INV. RADIATOR FAN FAILURE

The external dissipator cooling fan failed.

602

n AXIS: INV. OVERHEAT

The servo amplifier was overheated.

603

n AXIS: INV. IPM ALARM(OH)

The IPM (intelligent power module) detected an overheat alarm.

604

n AXIS: AMP. COMMUNICATION

ERROR

Communication between the SVM and the PSM failed.

605

n AXIS: CNV. EX. DISCHARGE POWER

PSMR: Regenerative power is too large.

606

n AXIS: CNV. RADIATOR FAN FAILURE

PSM: The external dissipator cooling fan failed.

PSMR: The external dissipator cooling fan failed.

607

n AXIS: CNV. SINGLE PHASE FAILURE

PSM: Input voltage is in the open–phase condition.

PSMR: Input voltage is in the open–phase condition.


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