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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 CodeDescription

-(dash)

Amplifier is not ready

Blinking "-"

(a) Disconnect the feedback cable (JF*) from the Servo Amplifier, and then switch on the power.
<1> If blinking continues → Replace the Servo Amplifier.
<2> If blinking stops → Go to (b). (b) Disconnect the feedback cable (JF*) from the Pulsecoder, and then switch on the power. (Keep
the cable on the Servo Amplifier side connected.)
<1> If blinking continues → Replace the cable.
<2> If blinking stops → Replace the motor.

0

Amplifier is ready (normal operating state)

01, 1

DC voltage of the main circuit power supply is abnormally high.

Internal cooling circuit faulty

Overcurrent flowed into the input of the main circuit. Input supply voltage imbalance, IGBT defective. (PSM-15 to PSM-55)

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

The main circuit power module (IPM) has detected an overload, overcurrent, or control supply voltage decrease, overcurrent, or control supply voltage decrease. Internal cooling circuit failure, Overload, Input supply voltage imbalance, IPM failure, or control supply voltage decrease of the power module.

02, 2

Internal cooling circuit faulty.

Inverter: control power supply undervoltage

The battery voltage of the absolute pulse coder is low.

2 (dot)

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

03, 3

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

The motor has overheated (OHAL).

The temperature of the heat sink has risen.

04, 4

DC voltage (DC link) has dropped

Regenerative discharge energy is too high.
–The regenerative discharge circuit is abnormal.

Servo motor has overheated (estimated value).

05, 5

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


Inverter: DC link undervoltage


The input power supply is abnormal (open phase) or the main circuit capacitor was not recharged within the specified time.

5, S

A communication error for the serial pulse coder was detected.

5 (dot)

Excessive regenerative discharge alarm.

06, 6

Inverter: overheat

Soft phase alarm

The input power supply is abnormal (open phase).

6 (dot)

Inverter: overheat

07, 7

MCC is faulty.

Relay contacts for the dynamic brake is faulty.

The DC link voltage is abnormally high.

08, 8

Abnormal current alarm (L axis)

The offset of the current detection circuit of the main circuit DC link is excessive.

The regenerative discharge unit is heated.

8. (dot)

Inverter: IPM alarm (L axis)

09, 9

Abnormal current alarm (M axis)

Reference position setting cannot be executed correctly.

9. (dot)

Inverter: IPM alarm (M axis)

11

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

16

The main circuit power supply has an open phase.

17

The DC link voltage is abnormally high.

18

An error occurred in internal parameter data transfer processing.

26

The frequency of the main circuit input power supply is abnormal.

36

The input power supply of the main circuit has an imbalance.

46

When the magnetic contactor is turned on, the phase sequence of the power supply cannot be determined.

A

A parameter has been specified incorrectly.

Abnormal current alarm (N axis)

External cooling circuit faulty.

A. (dot)

Inverter: IPM alarm (N axis)

A0

ROM is faulty.

A1

RAM is faulty

A2

A software is not operating normally.

b

Abnormal current alarm (L axis)

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

DC link current alarm (L axis)

b. (dot)

IPM alarm for L–and M–axis axes.

BRK

Breaker has tripped

c

An overcurrent alarm or IPM alarm

DC link current alarm (M axis)

C

Faulty cooling circuit

d

Abnormal current alarm (N axis)

DC link current alarm N axis)

DC

Discharge alarm

DCAL

The regenerative discharge circuit may be faulty

E

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

The input power supply is abnormal (open phase).

F

External cooling circuit faulty

H

The temperature of the regenerative resistor has arisen abnormally. (PSMR)

HCAL L/M

High current flow the the main circuit of that axis has occurred

HCL

High current alarm L axis

HCM

High current alarm M axis

HV

High voltage alarm

HVAL L/M

DC voltage of the power curcuit for that axis is high

J

The regenerative discharge unit has overheated

L

FSSB communication error

LV

Low voltage alarm

LVAL

The circuit voltage is unusually low

No LED

200-V control power (CX1A) is not supplied. Alternatively, the 24-VDC power is short-circuited.

OH

Overheat alarm

OVC L/M

Current exceeding the preset value has continued longer than normal.

P

Communication error between amplifier and module

DC link low voltage alarm

TGLS L/M

Feedback and velocity command mismatch

U

A parameter that requires power–down has been specified.

FSSB communication error

 

u

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

Y

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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