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FANUC AC SERVO MOTOR ai series, AC SPINDLE MOTOR ai series, SERVO AMPLIFIER ai series. MAINTENANCE MANUAL - page 4

3.TROUBLESHOOTING AND

ACTION

TROUBLESHOOTING

B-65285EN/04

(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.

3.2.12 Alarm Code U

(1) Meaning

Inverter: FSSB communication error (COP10B) (NOTE)

(2) Cause and troubleshooting

(a) Replace the Servo Amplifier optical cable (COP10B) that is nearest to the CNC on which "U" is

displayed (in Fig. 3.2.12, the cable between UNIT2 and UNIT3).

(b) Replace the Servo Amplifier that is nearest to the CNC on which "U" is displayed (in Fig. 3.2.12,

UNIT3).

(c) Replace the COP10B-side Servo Amplifier that is nearest to the CNC on which "U" is displayed

(in Fig. 3.2.12, UNIT2).

(d) Replace the servo card in the CNC.

UNIT1

UNIT2

UNIT3

UNIT4

L

L

U

U

COP10B

COP10B

COP10B

COP10B

Master side

(CNC side)

Slave side

COP10A

COP10A

COP10A

COP10A

Fig. 3.2.12

NOTE

When the CNC power is turned on, "U" blinks momentarily, and then "-" steadily

lights. This is not a failure, though.

3.2.13 Alarm Code L

(1) Meaning

Inverter: FSSB communication error (COP10A)

(2) Cause and troubleshooting

(a) Replace the Servo Amplifier optical cable (COP10A) that is farthest to the CNC on which "L" is

displayed (in Fig. 3.2.13, the cable between UNIT2 and UNIT3).

(b) Replace the Servo Amplifier that is farthest to the CNC on which "L" is displayed (in Fig. 3.2.13,

UNIT2).

(c) Replace the COP10A-side Servo Amplifier that is farthest to the CNC on which "L" is displayed

(in Fig. 3.2.13, UNIT3).

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3.TROUBLESHOOTING AND

B-65285EN/04

TROUBLESHOOTING

ACTION

UNIT1

UNIT2

UNIT3

UNIT4

L

L

U

U

COP10B

COP10B

COP10B

COP10B

Master side

(CNC side)

Slave side

COP10A

COP10A

COP10A

COP10A

Fig. 3.2.13

3.2.14 DB Relay Error (CNC Message "Alarm SV0654")

(1) Meaning

DB relay error

(2) Cause and troubleshooting

(a) Check whether the power lead is short-circuited.

(b) Replace the Servo Amplifier.

3.3

SERVO SOFTWARE

If a servo alarm is issued, an alarm message is output, and details of the alarm are also displayed on the

servo adjustment screen or the diagnosis screen. Using the alarm identification table given in this section,

determine the alarm, and take a proper action.

3.3.1

Servo Adjustment Screen

The following procedure can be used to display the servo adjustment screen.

(The DPL/MDI of the Power Mate has no servo adjustment screen.)

z

Series 15i

SYSTEM

→ [CHAPTER] → [SERVO] → [

] → [SERVO ALARM]

z

Series 16i, 18i, 20i, 21i, 0i

SYSTEM

→ [SYSTEM] → [

] → [SV-PRM] → [SV-TUN]

If the servo setting screen does not appear, specify the following parameter, then switch the CNC off and on

again.

#7

#6

#5

#4

#3

#2

#1

#0

3111

SVS

SVS (#0)=1 (to display the servo setting screen)

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3.TROUBLESHOOTING AND

ACTION

TROUBLESHOOTING

B-65285EN/04

Alarm detail

information

<1>

<2>

<3>

<4>

<5>

Fig. 3.3.1(a) Servo adjustment screen

Alarm detail

information

<1>

<6>

<2>

<7>

<3>

<8>

<4>

<9>

<5>

Fig. 3.3.1(b) Series 15i servo alarm screen

The table below indicates the names of the alarm bits.

Table 3.3.1 List of alarm bit names

#7

#6

#5

#4

#3

#2

#1

#0

<1> Alarm 1

OVL

LVA

OVC

HCA

HVA

DCA

FBA

OFA

<2> Alarm 2

ALD

EXP

<3> Alarm 3

CSA

BLA

PHA

RCA

BZA

CKA

SPH

<4> Alarm 4

DTE

CRC

STB

PRM

<5> Alarm 5

OFS

MCC

LDM

PMS

FAN

DAL

ABF

<6> Alarm 6

SFA

<7> Alarm 7

OHA

LDA

BLA

PHA

CMA

BZA

PMA

SPH

<8> Alarm 8

DTE

CRC

STB

SPD

<9> Alarm 9

FSD

SVE

IDW

NCE

IFE

NOTE

The empty fields do not represent alarm codes.

3.3.2

Diagnosis Screen

The alarm items of the servo adjustment screen correspond to the diagnosis screen numbers indicated in the

table below.

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3.TROUBLESHOOTING AND

B-65285EN/04

TROUBLESHOOTING

ACTION

Table 3.3.2

Correspondence between the servo adjustment screen and diagnosis screen

Alarm No.

Series 15i

Series 16i, 18i, 21i, 0i

<1> Alarm 1

No 3014 + 20(X-1)

No

200

<2> Alarm 2

3015 + 20(X-1)

201

<3> Alarm 3

3016 + 20(X-1)

202

<4> Alarm 4

3017 + 20(X-1)

203

<5> Alarm 5

⎯⎯⎯⎯⎯

204

<6> Alarm 6

⎯⎯⎯⎯⎯

⎯⎯

<7> Alarm 7

⎯⎯⎯⎯⎯

205

<8> Alarm 8

⎯⎯⎯⎯⎯

206

<9> Alarm 9

⎯⎯⎯⎯⎯

⎯⎯

<1>

<7>

<2>

<8>

<3>

<4>

<5>

Fig. 3.3.2 Diagnosis screen

3.3.3

Overload Alarm (Soft Thermal, OVC)

(Alarm identification method)

#7

#6

#5

#4

#3

#2

#1

#0

<1> Alarm 1

OVL

LVA

OVC

HCA

HVA

DCA

FBA

OFA

(Action)

(1) Make sure that the motor is not vibrating.

⇒ If a motor vibrates, the current flowing in it becomes more than necessary, resulting in an alarm.

(2) Make sure that the power lead to the motor is connected correctly.

⇒ If the connection is incorrect, an abnormal current flows in the motor, resulting in an alarm.

(3) Make sure that the following parameters are set correctly.

⇒ An overload alarm is issued based on the result of calculation of these parameters. Be sure to set

them to the standard values. For details of the standard values, refer to the FANUC AC SERVO

MOTOR αi series Parameter Manual (B-65270EN).

No. 1877 (FS15i)

Overload protection coefficient (OVC1)

No. 2062 (FS16i)

No. 1878 (FS15i)

Overload protection coefficient (OVC2)

No. 2063 (FS16i)

No. 1893 (FS15i)

Overload protection coefficient (OVCLMT)

No. 2065 (FS16i)

No. 1785 (FS15i)

Overload protection coefficient (OVC21)

No. 2162 (FS16i)

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3.TROUBLESHOOTING AND

ACTION

TROUBLESHOOTING

B-65285EN/04

No. 1786 (FS15i)

Overload protection coefficient (OVC22)

No. 2163 (FS16i)

No. 1787 (FS15i)

Overload protection coefficient (OVCLMT2)

No. 2165 (FS16i)

Measure the actual current values (IR, IS) using the SERVO GUIDE, compare the values with overload

duty curves in the Servo Motor Descriptions (B-65262EN), and check whether the load on the machine is

too large compared with the motor capacity. If the actual current is high on acceleration/deceleration, it is

likely that the time constant is too small.

3.3.4

Feedback Disconnected Alarm

(Alarm identification method)

#7

#6

#5

#4

#3

#2

#1

#0

<1> Alarm 1

OVL

LVA

OVC

HCA

HVA

DCA

FBA

OFA

<2> Alarm 2

ALD

EXP

<6> Alarm 6

SFA

FBA

ALD

EXP

SFA

Alarm description

Action

1

1

1

0

Hard disconnection (separate phase A/B)

1

1

0

0

0

Soft disconnection (closed loop)

2

1

0

0

1

Soft disconnection (αi Pulsecoder)

3

(Action)

Action 1: This alarm is issued when a separate phase A/B scale is used. Check if the phase A/B

detector is connected correctly.

Action 2: This alarm is issued when the position feedback pulse variation is small relative to the

velocity feedback pulse variation. This means that this alarm is not issued when a semi-full

is used. Check if the separate detector outputs position feedback pulses correctly. If

position feedback pulses are output correctly, it is considered that the motor alone is

rotating in the reverse direction at the start of machine operation because of a large

backlash between the motor position and scale position.

#7

#6

#5

#4

#3

#2

#1

#0

No. 1808 (FS15i)

TGAL

No. 2003 (FS16i)

TGAL (#1) 1: Uses the parameter for the soft disconnection alarm detection level.

No. 1892 (FS15i)

Soft disconnection alarm level

No. 2064 (FS16i)

Standard setting 4: Alarm issued for a 1/8 rotation of the motor.

Increase this value.

Action 3: This alarm is issued when synchronization between the absolute position data sent from the

built-in Pulsecoder and phase data is lost. Turn off the power to the CNC, then detach the

Pulsecoder cable then attach it again. If this alarm is still issued, replace the Pulsecoder.

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3.TROUBLESHOOTING AND

B-65285EN/04

TROUBLESHOOTING

ACTION

3.3.5

Overheat Alarm

(Alarm identification method)

#7

#6

#5

#4

#3

#2

#1

#0

<1> Alarm 1

OVL

LVA

OVC

HCA

HVA

DCA

FBA

OFA

<2> Alarm 2

ALD

EXP

OVL

ALD

EXP

Alarm description

Action

1

1

0

Motor overheat

1

1

0

0

Amplifier overheat

1

(Action)

(1) Motor overheat

First, check whether the motor temperature is high immediately after the alarm is issued. If the alarm is

issued when the motor temperature is not high, the temperature detection circuit may be abnormal.

Contact your FANUC service staff.

When the motor temperature is high immediately after the alarm is issued, check the following items:

(a) Check the cooling state of the motor.

<1> If the cooling state is abnormal, for example, when the cooling fan stops, check the power

specification (voltage, phase sequence, and so on) of the cooling fan. If there is no problem

with the power specification, replace the fan unit.

<2> When a liquid-cooled motor is used, check the cooling system.

<3> When the motor ambient temperature is higher than the specified temperature, lower the

ambient temperature to satisfy the specification.

(b) Increase the time constant or stop time in the program to ease the cutting conditions.

Motor temperature information is displayed on the diagnosis screen.

Motor temperature: Diagnosis information No. 308 (Series 16i, 30i, and others), diagnosis

information No. 3520 (Series 15i)

Pulsecoder temperature: Diagnosis information No. 309 (Series 16i, 30i, and others), diagnosis

information No. 3521 (Series 15i)

If an overheat alarm is issued when the temperature is not high, contact your FANUC service

staff.

(2) Amplifier overheat

See the description about inverter overheat in Subsection 3.2.4.

3.3.6

Invalid Servo Parameter Setting Alarm

The invalid servo parameter setting alarm is issued when a setting out of the specifiable range is specified,

or an overflow has occurred in an internal calculation. When an invalid parameter is detected on the servo

side, alarm 4 #4 (PRM) = 1 results.

(Alarm identification method)

#7

#6

#5

#4

#3

#2

#1

#0

<4> Alarm 4

DTE

CRC

STB

PRM

For details and action required when the invalid servo parameter setting alarm is issued on the servo side,

refer to the FANUC AC SERVO MOTOR αi series Parameter Manual (B-65270EN).

(Reference information)

Method of checking details of an invalid parameter detected on the servo side

(For Series 15i)

A number is indicated in the item "Details of invalid parameter" on the servo alarm screen (Fig.

3.3.1(b)).

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3.TROUBLESHOOTING AND

ACTION

TROUBLESHOOTING

B-65285EN/04

(For Series 16i, 18i, 21i, 0i, and Power Mate i)

A number is indicated in No. 352 of the diagnosis screen.

Referring to "FANUC AC SERVO MOTOR αi series Parameter Manual (B-65270EN)" for details.

3.3.7

Alarms Related to Pulsecoder and Separate Serial Detector

(Bits for alarm identification)

#7

#6

#5

#4

#3

#2

#1

#0

<1> Alarm 1

OVL

LVA

OVC

HCA

HVA

DCA

FBA

OFA

<2> Alarm 2

ALD

EXP

<3> Alarm 3

CSA

BLA

PHA

RCA

BZA

CKA

SPH

<4> Alarm 4

DTE

CRC

STB

PRM

<5> Alarm 5

OFS

MCC

LDM

PMS

FAN

DAL

ABF

<6> Alarm 6

SFA

<7> Alarm 7

OHA

LDA

BLA

PHA

CMA

BZA

PMA

SPH

<8> Alarm 8

DTE

CRC

STB

SPD

<9> Alarm 9

FSD

SVE

IDW

NCE

IFE

(1) For a built-in Pulsecoder

An alarm is determined from the bits of alarms 1, 2, 3, and 5. The table below indicates the meaning of

each bit.

Alarm 3

Alarm 5

1

Alarm 2

Alarm description

Action

CSA

BLA

PHA

RCA

BZA

CKA

SPH

LDM

PMA

FBA

ALD

EXP

1

Soft phase alarm

2

1

Zero battery voltage

1

1

1

1

0

Count error alarm

2

1

Phase alarm

2

Battery voltage decrease

1

1

(warning)

1

Pulse error alarm

1

LED error alarm

CAUTION

An alarm for which no action number is given is considered to be caused by a

Pulsecoder failure. Replace the Pulsecoder.

(2) For a separate serial detector

An alarm is determined from the bits of alarm 7. The table below indicates the meaning of each bit.

Alarm 7

Alarm description

Action

OHA

LDA

BLA

PHA

CMA

BZA

PMA

SPH

1

Soft phase alarm

2

1

Pulse error alarm

1

Zero battery voltage

1

1

Count error alarm

2

1

Phase alarm

2

1

Battery voltage decrease (warning)

1

1

LED error alarm

1

Separate detector alarm

3

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3.TROUBLESHOOTING AND

B-65285EN/04

TROUBLESHOOTING

ACTION

CAUTION

An alarm for which no action number is given is considered to be caused by a

detector failure. Replace the detector.

(Action)

Action 1: Battery-related alarms

Check if a battery is connected. When the power is turned on for the first time after a battery

is connected, the zero battery voltage alarm is issued. In such a case, turn off the power,

then turn on the power again. If the alarm is still issued, check the battery voltage. If the

battery voltage decrease alarm is issued, check the voltage, and replace the battery as

required.

Action 2: Alarms that may be issued for noise

If an alarm is issued intermittently or after emergency stop cancellation, noise is probably

the cause. So, provide noise protection. If the same alarm is still issued after noise

protection is provided, replace the detector.

Action 3: Alarm condition detected by the separate detector

If the separate detector detects an alarm condition, contact the manufacturer of the detector

for information on troubleshooting.

(3) Alarms related to serial communication

An alarm is determined from the bits of alarms 4 and 8.

Alarm 4

Alarm 8

Alarm description

DTE

CRC

STB

DTE

CRC

STB

1

1

Serial Pulsecoder communication alarm

1

1

1

Separate serial Pulsecoder communication alarm

1

Action: Serial communication is not performed correctly. Check if the cable is connected correctly

and is not broken. If CRC or STB is issued, noise may be the cause. So, provide noise

protection. If CRC or STB is always issued after the power is turned on, the Pulsecoder or

amplifier control board or the pulse module may be faulty.

3.3.8

Other Alarms

(Alarm identification method)

#7

#6

#5

#4

#3

#2

#1

#0

<5> Alarm 5

OFS

MCC

LDM

PMS

FAN

DAL

ABF

OFS

DAL

ABF

Alarm description

Action

1

Feedback mismatch alarm

1

1

Excessive semi-full error alarm

2

1

Current offset error alarm

3

(Action)

Action 1: This alarm is issued when the move direction of the position detector is opposite to the

move direction of the speed detector. Check the rotation direction of the separate detector.

If the rotation direction of the separate detector is opposite to the rotation direction of the

motor, take the following action:

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3.TROUBLESHOOTING AND

ACTION

TROUBLESHOOTING

B-65285EN/04

For a phase A/B detector:

Reverse the connections of A and A.

For a serial detector:

Reverse the setting of the signal direction of the separate detector.

In the Series 90B0/G(07) and subsequent editions, the following settings enable signal

directions in the A/B phase detector to be inverted.

#7

#6

#5

#4

#3

#2

#1

#0

No. 1960 (FS15i)

RVRSE

No. 2018 (FS16i)

RVRSE (#0) Reverses the signal direction of the separate detector.

0: Does not reverse the signal direction of the separate detector.

1: Reverses the signal direction of the separate detector.

If a large distortion exists between the motor and separate detector, this alarm may be

issued in the case of abrupt acceleration/deceleration. In such a case, modify the detection

level.

#7

#6

#5

#4

#3

#2

#1

#0

No. 1741 (FS15i)

RNLV

No. 2201 (FS16i)

RNLV (#1) Modifies the feedback mismatch alarm detection level.

1: Detected with 1000 min^-1 or more

0: Detected with 600 min^-1 or more

Action 2: This alarm is issued when the difference between the motor position and separate detector

position exceeds the excessive semi-full error level. Check if the conversion efficient for

dual position feedback is set correctly. If the conversion efficient is set correctly, increase

the alarm level. If this alarm is still issued after the level is modified, check the connection

direction of the scale.

No. 1971 (FS15i)

Dual position feedback conversion coefficient (numerator)

No. 2078 (FS16i)

No. 1972 (FS15i)

Dual position feedback conversion coefficient (denominator)

No. 2079 (FS16i)

Number of feedback pulses per motor

revolution (detection unit)

Conversion coefficient =

1,000,000

No. 1729 (FS15i)

Dual position feedback semi-full error level

No. 2118 (FS16i)

[Setting] Detection unit. When 0 is set, no detection is made.

Action 3: The current offset value of the current detector (equivalent to the current value in the

emergency stop state) is abnormally high. If this alarm is still issued after the power is

turned off then back on, the current detector is faulty. For the αi series, replace the

amplifier.

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3.TROUBLESHOOTING AND

B-65285EN/04

TROUBLESHOOTING

ACTION

3.4

SPINDLE AMPLIFIER

If an alarm occurs in the Spindle Amplifier, the ALM LED lights red in the STATUS display, and the

two-digit 7-segment LEDs indicate the alarm code.

The ALM LED

lights red.

status

Alarm code 01, 02 or above is indicated.

3.4.1

Alarm Code 01

The inside temperature of the motor is higher than the specified temperature.

(1)

If this alarm is issued during cutting (the motor temperature is high)

(a) Check the cooling state of the motor.

<1> If the cooling fan of the spindle motor is stopped, check the power supply of the cooling fan.

If the cooling fan is still inoperative, replace it with a new one.

<2> When a liquid-cooled motor is used, check the cooling system.

<3> When the ambient temperature of the spindle motor is higher than the specified temperature,

lower the ambient temperature to satisfy the specification.

(b) Recheck the cutting conditions.

(2)

If this alarm is issued under a light load (the motor temperature is high)

(a) When the frequency of acceleration/deceleration is too high

Set such a use condition that the average including output at acceleration/deceleration does not

exceed the continuous rating.

(b) The parameters specific to the motor are not correctly.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN),"

check the motor-specific parameters.

(3)

If this alarm is issued when the motor temperature is low

(a) The spindle motor feedback cable is faulty.

Replace the cable.

(b) The parameters specific to the motor are not set correctly.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN),"

check the motor-specific parameters.

FS16i

FS30i

For α series motor

For αi series motor

FS15i

FS0i-B/C

FS0i-D

3134

4134

4134

0

Motor-specific parameter

(c) The control printed circuit board is faulty.

Replace the control printed circuit board or spindle amplifier.

(d) The motor (internal thermostat) is faulty.

Replace the motor.

3.4.2

Alarm Code 02

The actual motor speed is largely deviated from the commanded speed.

(1) If this alarm is issued during motor acceleration

(a) The parameter setting of acceleration/deceleration time is incorrect.

Set the following parameter with the actual acceleration/deceleration time for your machine plus

some margin.

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3.TROUBLESHOOTING AND

ACTION

TROUBLESHOOTING

B-65285EN/04

FS16i

FS30i

FS15i

Description

FS0i-B/C

FS0i-D

3082

4082

4082

Setting of acceleration/deceleration time

(b) The parameter for the speed detector is not set correctly.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN)," set a

correct value.

(2) If this alarm is issued at a heavy cutting load

(a) The cutting load has exceeded the motor output power.

Check the load meter indication, and review the use condition.

(b) The parameters for output restriction are not set correctly.

Check that the settings of the following parameters satisfy the machine and motor specifications:

FS16i

FS30i

FS15i

Description

FS0i-B/C

FS0i-D

3028

4028

4028

Output restriction pattern setting

3029

4029

4029

Output restriction value

(c) The parameters specific to the motor are not correctly.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN),"

check the motor-specific parameters.

3.4.3

Alarm Code 03

The fuse of the DC link has blown. (The voltage at the DC link is insufficient.) This alarm is checked when

emergency stop is cancelled.

(1) If this alarm is issued during spindle operation (rotation)

The fuse of the DC link inside the Spindle Amplifier has probably blown. So, replace the Spindle

Amplifier. This alarm may be caused by the following:

<1> Power lead short-circuited to ground

<2> Motor winding short-circuited to ground

<3> IGBT or IPM module failure

(2) If the Power Supply input magnetic contactor is once turned on and is turned off with this alarm when

emergency stop is cancelled or the CNC is started (When two spindles are connected, the magnetic

contactor may not be turned off.)

(a) The DC link wire is not connected.

Check the DC link wiring for errors.

(b) The fuse of the DC link inside the Spindle Amplifier has blown.

Replace the Spindle Amplifier.

3.4.4

Alarm Code 06

The temperature sensor is abnormal, or the temperature sensor cable is broken.

(1) The parameters specific to the motor are not correctly.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN)," check the

motor-specific parameters.

(2) Cable is faulty.

Feedback cable is faulty.

Replace the cable.

(3) The control printed-circuit board is faulty.

Replace the control printed-circuit board or spindle amplifier.

(4) A thermo sensor is faulty.

Replace the motor (thermo sensor).

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3.TROUBLESHOOTING AND

B-65285EN/04

TROUBLESHOOTING

ACTION

3.4.11 Alarm Code 15

In output switching control or spindle switching control, the switching operation sequence was not executed

correctly.

This alarm is issued if one second or more elapses from the transition of a switch request signal (SPSL or

RSL) until a power lead state check signal (MCFN, MFNHG, RCH, or RCHHG) makes a transition.

(1) Troubleshooting when this alarm is issued

(a) The magnetic contactor (switch unit) for power lead switching is faulty.

If the contact is inoperative, check the power supply of the magnetic contactor. If the magnetic

contactor is still inoperative, replace the magnetic contactor.

(b) The I/O unit or wiring for checking the contact of the magnetic contactor is faulty.

If a defect is found in the I/O unit or wiring, replace the I/O unit or wiring.

(c) The sequence (ladder) is incorrect.

Modify the sequence so that switching is completed within 1 second.

3.4.12 Alarm Code 16

An error was found in a CPU internal RAM test by the Dual Check Safety function.

Troubleshooting when this alarm is issued

The Spindle Amplifier is abnormal. Replace the Spindle Amplifier.

3.4.13 Alarm Code 17

An error was detected in amplifier ID data.

Troubleshooting when this alarm is issued

The Spindle Amplifier control printed-circuit board becomes loose or the Spindle Amplifier

is

abnormal.

Check whether the Spindle Amplifier control printed-circuit board is mounted correctly.

When the board is mounted correctly, replace the Spindle Amplifier.

3.4.14 Alarm Code 18

A sum check is abnormal.

If this alarm is issued, replace the Spindle Amplifier or Spindle Amplifier control printed-circuit board.

3.4.15 Alarm Codes 19 and 20

The offset voltage of the phase U (alarm code 19) or phase V (alarm code 20) current detection circuit is

excessively high. A check is made when the power is turned on.

If this alarm is issued, replace the Spindle Amplifier. If this alarm is issued immediately after the Spindle

Amplifier control printed circuit board is replaced, check the plugging of the connectors between the power

unit and Spindle Amplifier control printed circuit board.

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3.4.16 Alarm Code 21

The specified polarity of the position sensor is incorrect.

Troubleshooting when this alarm is issued

(a) Check the position sensor polarity parameter (bit 4 of parameter No. 4001).

(b) Check the feedback cable of the position sensor.

3.4.17 Alarm Code 22

Overcurrent exceeding the time rating of the Spindle Amplifier flowed.

Possible causes are a high frequency of acceleration/deceleration and high cutting load.

Troubleshooting when this alarm is issued

Ease the operation conditions.

3.4.18 Alarm Code 24

Serial communication data transferred between the CNC and Spindle Amplifier contains an error. (Note)

Troubleshooting when this alarm is issued

(a) Noise occurring between the CNC and Spindle Amplifier (connected via an electric cable) caused

an error in communication data.

Check the condition for maximum wiring length.

Referring to "Connection," in "FANUC SERVO AMPLIFIER αi series Descriptions

(B-65282EN)," check the condition of electric cable connection.

(b) Noise exercises an influence because a communication cable is bundled with the power lead.

If a communication cable is bundled with the power lead for the motor, separate them from each

other.

(c) A cable is faulty.

Replace the cable.

If an optical I/O link adapter is used, the optical link adapter or optical cable may be faulty.

(d) The Spindle Amplifier is faulty.

Replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

(e) The CNC is faulty.

Replace the board or module related to the serial spindle.

NOTE

This alarm is issued also if the CNC power is off. This is not a failure, though.

3.4.19 Alarm Code 27

The signal of the αi position coder is disconnected.

(1) If this alarm is issued when the motor is deactivated

(a) The setting of a parameter is incorrect.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN),"

check the parameter for sensor setting.

(b) The cable is disconnected.

If the connection of the feedback cable is correct, replace the cable.

(c) The Spindle Amplifier is faulty.

Replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

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(2) If this alarm is issued when the cable is moved

(a) The connector has a bad contact, or the cable is disconnected.

The conductor may be broken. Replace the cable. If coolant has penetrated into the connector,

clean the connector.

αi position coder

Shielded cable

S

P

Connected to the frame

ground via a cable clamp.

(3) If this alarm is issued when the motor rotates

(a) The shielding of the cable between the sensor and the Spindle Amplifier is faulty.

Referring to, "Connection," in "FANUC SERVO AMPLIFIER αi series Descriptions

(B-65282EN)," check the shielding of the cable.

(b) The signal cable is bundled with the servo motor power lead.

If the cable between the sensor and the Spindle Amplifier is bundled with the servo motor power

lead, separate them from each other.

3.4.20 Alarm Code 29

An excessive load (standard setting: load meter reading of 9 V) has been applied continuously for a certain

period (standard setting: 30 seconds).

(1) If this alarm is issued during cutting

Check the load meter, and review the cutting condition.

(2) If this alarm is issued during a stop

(a) The spindle is locked.

Check the sequence to see if the spindle is locked when a command for very slow movement is

specified or orientation is specified for the spindle.

(3) If the spindle does not rotate as specified (the spindle rotates at a very low speed) and this alarm is

issued

(a) The setting of a parameter is incorrect.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN),"

check the parameter for sensor setting.

(b) The phase sequence of the motor power lead is incorrect.

(c) The feedback cable of the motor has a problem.

Check if the phase A/B signals are connected correctly.

(d) The feedback cable of the motor is faulty.

Rotate the motor manually to see if a speed is indicated in the item of motor speed on the CNC

diagnosis screen or on the spindle check board. If no speed indication is provided, replace the

cable or spindle sensor (or motor).

(4) If the spindle does not rotate as specified (the spindle does not rotate at all) and this alarm is issued

(a) The power lead is abnormal.

Check if the motor power lead is connected normally. If spindle switching or output switching is

performed, check if the magnetic contactor is on.

(b) The Spindle Amplifier is faulty.

Replace the Spindle Amplifier.

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3.4.21 Alarm Code 31

The motor failed to rotate as specified, and has stopped or is rotating at a very low speed.

(1) If the motor rotates at a very low speed and this alarm is issued

(a) The setting of a parameter is incorrect.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN),"

check the parameter for sensor setting.

(b) The phase sequence of the motor power lead is incorrect.

Check whether the phase sequence of the motor power lead is correct.

(c) The feedback cable of the motor has a problem.

Check if the phase A/B signals are connected correctly.

(d) The feedback cable of the motor is faulty.

Rotate the motor manually to see if a speed is indicated in the item of motor speed on the CNC

diagnosis screen or on the spindle check board. If no speed indication is provided, replace the

cable or spindle sensor (or motor).

(2) If the motor does not rotate at all and this alarm is issued

(a) The sequence for locking the spindle is incorrect.

Check the sequence to see if the spindle is locked.

(b) The power lead is faulty.

Check if the power lead is connected to the motor correctly. If spindle switching or winding

switching is performed, check if the magnetic contactor is on.

(c) The Spindle Amplifier is faulty.

Replace the Spindle Amplifier.

3.4.22 Alarm Code 32

LSI memory for serial communication is abnormal. A check is made when the power is turned on.

If this alarm is issued, replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

3.4.23 Alarm Code 34

Parameter data outside the specifiable range was set.

Troubleshooting when this alarm is issued

Connect the spindle check board.

The spindle check board displays "AL-34" and "F-xxx" alternately. "F-xxx" indicates a parameter

number outside the specifiable range. For the correspondence between the CNC parameter numbers

and "F-xxx," refer to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN)."

3.4.24 Alarm Code 36

The error counter overflowed.

(1) The setting of a parameter is incorrect.

(a) The gear ratio set in a parameter is incorrect.

Check if an excessively large gear ratio is set.

(b) The setting of a position gain is incorrect.

If the gear ratio data is correct, increase the position gain.

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FS16i

FS30i

FS15i

Description

FS0i-B/C

FS0i-D

3056 to 3059

4056 to4059

4056 to4059

Gear ratio between the spindle and motor

3060 to3063

4060 to4063

4060 to4063

Position gain at orientation

3065 to3068

4065 to4068

4065 to4068

Position gain in the servo mode/spindle synchronization

3069 to3072

4069 to4072

4069 to4072

Position gain in Cs contour control

(2) Sequence error

(a) Check if the motor is deactivated (by turning off SFR/SRV) in a position control mode (rigid

tapping, Cs contour control, or spindle synchronization).

3.4.25 Alarm Code 37

After emergency stop signal input, the motor is accelerated without being decelerated. This alarm is issued

also when the motor is not deactivated

(the motor is not decelerated completely) when the

acceleration/deceleration time (initial parameter setting: 10 seconds) has elapsed after emergency stop

signal input.

Troubleshooting when this alarm is issued

(a) The parameter setting of the speed detector is incorrect.

Referring to Chapter

1 in "FANUC AC SPINDLE MOTOR αi series Parameter Manual

(B-65280EN)," set a correct time.

(b) The parameter setting of an acceleration/deceleration time is not proper.

Check the parameter-set value and actual acceleration/ deceleration time, then set an actual

acceleration/deceleration time plus some margin.

FS16i

FS30i

FS15i

Description

FS0i-B/C

FS0i-D

3082

4082

4082

Acceleration/deceleration time setting

3.4.26 Alarm Code 41

The position where the one-rotation signal of the αi position coder is generated is incorrect.

αi position coder

Shielded cable

S

P

Connected to the frame

ground via a cable clamp.

Troubleshooting when this alarm is issued

(a) The setting of a parameter is incorrect.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN)," check the

parameter for sensor setting.

(b) The αi position coder is faulty.

Observe the Z signal of the position coder. If the signal is not generated per rotation, replace the

position coder.

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(b) The shielding of the cable between the sensor and Spindle Amplifier is faulty.

Referring to "Connection," in "FANUC SERVO AMPLIFIER αi series Descriptions

(B-65282EN)," check the shielding of the cable.

(c) The signal cable is bundled with the servo motor power lead.

If the cable between the sensor and Spindle Amplifier is bundled with the servo motor power lead,

separate them from each other.

(d) The Spindle Amplifier is faulty.

Replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

αi position coder

Shielded cable

S

P

Connected to the frame

ground via a cable clamp.

3.4.31 Alarm Code 49

In differential spindle speed control, the speed of the master spindle converted to the motor speed of the

slave spindle exceeded the allowable range.

Troubleshooting when this alarm is issued

The master spindle speed is converted to the motor speed of the slave spindle by multiplying the

master spindle speed by the gear ratio between the slave spindle and motor. Check whether the

converted spindle speed exceeds the maximum motor speed and operate the machine so that the

maximum motor speed is not exceeded.

3.4.32 Alarm Code 50

A value obtained by internal calculation in spindle synchronization exceeded the allowable range.

Troubleshooting when this alarm is issued

(a) The setting of parameters for gear ratio setting is incorrect.

Check if an excessively large gear ratio is set.

(b) Position gain setting limit

If correct gear ratio data is set, increase the position gain value in spindle synchronization.

FS16i

FS30i

Description

FS0i-B/C

FS0i-D

4056 to 4059

4056 to 4059

Gear ratio between the spindle and motor

4065 to 4068

4065 to 4068

Position gain in the servo mode/spindle synchronization

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3.4.33 Alarm Codes 52 and 53

The synchronization signal (ITP) in communication data transferred to and from the CNC stopped.

Troubleshooting when this alarm is issued

(a) The Spindle Amplifier is faulty.

Replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

(b) The CNC is faulty.

Replace the board or module related to the serial spindle.

3.4.34 Alarm Code 54

A large current flowing in the motor for a long time was detected.

Troubleshoot as in the case of alarm code 29.

3.4.35 Alarm Code 55

In spindle switching control or output switching control, a mismatch between the switching request signal

(SPSL or RSL) and the power lead state check signal (MCFN, MFNHG, RCH, or RCHHG) continues

during motor activation.

Troubleshooting when this alarm is issued

(a) The magnetic contactor (switch unit) for power lead switching is faulty.

If the contact is inoperative, check the power supply of the magnetic contactor. If the magnetic

contactor is still inoperative, replace the magnetic contactor.

(b) The I/O unit or wiring for checking the contact of the magnetic contactor is faulty.

If a defect is found in the I/O unit or wiring, replace the I/O unit or wiring.

(c) The sequence (ladder) is incorrect.

Modify the sequence so that switching is not performed during activation. For details of the signals,

refer to "FANUC SERVO AMPLIFIER αi series Descriptions (B-65282EN)."

3.4.36 Alarm Code 56

The cooling fan for the control circuit section has stopped.

(a) Poor installation of the control printed-circuit board

Be sure to push the faceplate as far as it will go. (This alarm may be displayed if one of the connectors

for connection between the control printed-circuit board and power printed-circuit board is detached.)

(b) Replace the Spindle Amplifier or its internal cooling fan.

3.4.37 Alarm Code 61

The difference in position between the semi-closed side and closed side exceeded the setting level

(parameter No. 4354) for the dual position feedback function.

Troubleshooting when this alarm is issued

(a) When this alarm is issued at the start of the machine, there may be a setting error in a sensor-related

parameter or motor-end position feedback conversion coefficient parameter.

Check whether conversion coefficient parameters Nos. 4171 and 4172 (in high gear) and Nos. 4173

and 4174 (in low gear) are set correctly. Also, refer to the FANUC AC SPINDLE MOTOR ai series

Parameter Manual (B-65280EN) to check the settings of the sensor-related parameters.

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(3) If this alarm is issued when the motor rotates

(a) The shielding of the cable between the sensor and the Spindle Amplifier is faulty.

Referring to, "Connection," in "FANUC SERVO AMPLIFIER αi series Descriptions

(B-65282EN)," check the shielding of the cable.

(b) The signal cable is bundled with the servo motor power lead.

If the cable between the sensor and the Spindle Amplifier is bundled with the servo motor power

lead, separate them from each other.

αiMZ or αiBZ sensor

Shielded cable

S

P

The cable is

The cable is

connected to the

connected to

pin specified in the

pin 10 on the

specifications on

SP side.

the sensor side.

3.4.46 Alarm Code 74

This alarm can be issued only when Dual Check Safety is in use.

The CPU test failed to end normally.

When this alarm is issued, Replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

3.4.47 Alarm Code 75

This alarm can be issued only when Dual Check Safety is in use.

An error occurred in the CRC test.

When this alarm is issued, Replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

3.4.48 Alarm Code 76

This alarm can be issued only when Dual Check Safety is in use.

The spindle safety function has not been executed.

If the alarm occurs, replace the Spindle Amplifier control printed-circuit board.

3.4.49 Alarm Code 77

This alarm can be issued only when Dual Check Safety is in use.

The result of the spindle amplifier axis number check does not match the result of the CNC axis number

check.

If the alarm occurs, replace the CPU card in the CNC or the Spindle Amplifier control printed-circuit board.

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3.4.50 Alarm Code 78

This alarm can be issued only when Dual Check Safety is in use.

The result of spindle amplifier safety parameter check does not match the result of the CNC safety

parameter check.

If the alarm occurs, replace the CPU card in the CNC or the Spindle Amplifier control printed-circuit board.

3.4.51 Alarm Code 79

This alarm can be issued only when Dual Check Safety is in use.

An abnormal operation was detected in the initial test.

When this alarm is issued, Replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

3.4.52 Alarm Code 80

A spindle alarm was issued for the destination amplifier in inter-Spindle Amplifier communication

(connector JX4).

Troubleshooting when this alarm is issued

(a) There is no problem with the Spindle Amplifier to which this alarm is issued. Check the spindle alarm

in the destination amplifier and take appropriate action.

3.4.53 Alarm Code 81

The position where the one-rotation signal of the motor sensor is generated is incorrect.

(1) If the external one-rotation signal is used

(a) The settings of parameters are incorrect.

Check that the gear ratio data matches the specification of the machine.

FS16i

FS30i

FS15i

Description

FS0i-B/C

FS0i-D

3171

4171

4171

Denominator of gear ratio between motor sensor and spindle

3173

4173

4173

3172

4172

4172

Numerator of gear ratio between motor sensor and spindle

3174

4174

4174

(b) Slippage between the spindle and motor

Check that there is no slippage between the spindle and motor. The external one-rotation signal is

not applicable to V-belt connection.

(2) Troubleshooting in other cases

(a) The setting of a parameter is incorrect.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN),"

check the parameter for sensor setting.

(b) A sensor (αiMZ sensor or αiBZ sensor) is not adjusted correctly.

Adjust the sensor signal. If the sensor signal cannot be adjusted correctly, or the sensor signal is

not observed, replace the connection cable and sensor.

(c) The shielding of the cable between the sensor and Spindle Amplifier is faulty.

Referring to "Connection," in "FANUC SERVO AMPLIFIER αi series Descriptions

(B-65282EN)," check the shielding of the cable.

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(d) The signal cable is bundled with the servo motor power lead.

If the cable between the sensor and Spindle Amplifier is bundled with the servo motor power lead,

separate them from each other.

(e) The Spindle Amplifier is faulty.

Replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

αiMZ or αiBZ sensor

Shielded cable

S

P

The cable is

The cable is

connected to the

connected to

pin specified in the

pin 10 on the

specifications on

SP side.

the sensor side.

3.4.54 Alarm Code 82

The one-rotation signal of the motor sensor is not generated.

Troubleshooting when this alarm is issued

(a) The setting of a parameter is incorrect.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN)," check the

parameter for sensor setting.

(b) The αiMZ sensor or αiBZ sensor is not adjusted correctly.

Adjust the sensor. If the sensor cannot be adjusted or the signal is not observed, replace the connection

cable and sensor.

(c) The external one-rotation signal is faulty.

Check the check pin EXTSC1 on the spindle check board. If the signal is not generated per rotation,

replace the connection cable and position coder.

(d) The Spindle Amplifier is faulty.

Replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

3.4.55 Alarm Code 83

The Spindle Amplifier checks the pulse counts of phases A and B each time a one-rotation signal is

generated. The alarm is issued when a pulse count beyond the specified range is detected.

(1) If this alarm is issued when the cable is moved (as in the case where the spindle moves)

The conductor may be broken. Replace the cable. If coolant has penetrated into the connector, clean

the connector.

(2) Troubleshooting in other cases

(a) The setting of a parameter is incorrect.

Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN),"

check the parameter for sensor setting.

(b) The αiMZ sensor or αiBZ sensor is not adjusted correctly.

Adjust the sensor. If the sensor cannot be adjusted or the signal is not observed, replace the

connection cable and sensor.

(c) The shielding of the cable between the sensor and Spindle Amplifier is faulty.

Referring to "Connection," in "FANUC SERVO AMPLIFIER αi series Descriptions

(B-65282EN)," check the shielding of the cable.

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(d) The signal cable is bundled with the servo motor power lead.

If the cable between the sensor and Spindle Amplifier is bundled with the servo motor power lead,

separate them from each other.

(e) The Spindle Amplifier is faulty.

Replace the Spindle Amplifier or Spindle Amplifier control printed circuit board.

αiMZ or αiBZ sensor

Shielded cable

S

P

The cable is

The cable is

connected to the

connected to

pin specified in the

pin 10 on the

specifications on

SP side.

the sensor side.

3.4.56 Alarm Code 84

The spindle sensor signal was disconnected.

Refer to Alarm Code 73 for this alarm trouble shooting.

3.4.57 Alarm Code 85

The one-rotation signal of the spindle sensor occurred in an incorrect location.

Refer to Alarm Code 81 for this alarm trouble shooting.

3.4.58 Alarm Code 86

No spindle sensor one-rotation signal occurred.

Refer to Alarm Code 82 for this alarm trouble shooting.

3.4.59 Alarm Code 87

A spindle sensor signal is abnormal.

Refer to Alarm Code 83 for this alarm trouble shooting.

3.4.60 Alarm Code 88

The heat sink cooling fan is not running.

If this alarm is issued, replace the Spindle Amplifier heat sink cooling fan.

3.4.61 Alarm Code 89

The submodule SM (SSM) is abnormal. This spindle alarm is issued for the BiS Series spindle motors

(synchronous spindle motors).

When this alarm is issued at the start, possible causes are all of (a) to (d) below. When the machine has been

operating normally, possible causes are (c) and (d).

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3.4.67 Alarm Codes C0,C1, and C2

An error occurred in serial communication data between the CNC and Spindle Amplifier.

Troubleshooting when this alarm is issued

(a) The Spindle Amplifier is defective.

Replace the Spindle Amplifier or Spindle Amplifier control printed-circuit board.

(b) The CNC is defective.

Replace the board or module related to the serial spindle.

3.4.68 Alarm Code C3

In spindle switching, a mismatch is found between the switching request signal (SPSL) and the internal

status of the motor/spindle sensor signal switching circuit (submodule SW).

Troubleshooting when this alarm is issued

The submodule SW (SSW) is defective.

Replace the submodule SW (SSW).

3.4.69 Alarm Code C4

An invalid learning cycle is set in learning control in the time synchronization mode.

Troubleshooting when this alarm is issued

(a) Check whether the value specified in the velocity command is appropriate.

(b) Check whether the setting of the learning cycle (parameter No. 4425) is within a range between 20 and

4800.

3.4.70 Alarm Code C5

An invalid value is set for the highest or lowest degree of a dynamic characteristic compensation element in

learning control.

Troubleshooting when this alarm is issued

Decrease the setting of the highest (parameter No. 4427) or lowest (parameter No. 4428) of dynamic

characteristic compensation element Gx.

3.4.71 Alarm Code C7

An invalid reference angle cycle is set in learning control in the angle synchronization mode.

Troubleshooting when this alarm is issued

Increase the setting of parameter No. 4425 (number of divisions per cycle) in learning control.

3.4.72 Alarm Code C8

In spindle synchronization, the speed deviation (difference between the specified speed at the spindle end

calculated based on the position error and position gain and the actual speed) exceeded the alarm detection

level (parameter No. 4515).

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