FANUC Series 16i/160i/160is-MODEL B, Series 18i/180i/180is-MODEL B, Series 21i/210i/210is-MODEL B. MAINTENANCE MANAUL

11. TROUBLESHOOTING

B-63525EN/02

[For the stand-alone

type]

D Power supply of the LCD

Check that the power cable is connected to the connector CP1A of the

unit

LCD unit.

Connector for connecting the backlight cable

Inverter printed circuit board

Connector for connecting

the LCD cable

LCD control printed

circuit board

Optical cable

COP20B

24 V input

CP1A

For 24 V branch

CP1B

D LED display

Referring to the hardware chapter, check the LED on/off status of the main

CPU board.

If the main CPU board has started up normally and the LED display

indicates normal operation, a probable cause is a fault of the display

system, such as the cable of the LCD unit not connected or a defective

inverter board.

If the LED display is locked in the middle of the startup process, the

probable causes include defective hardware (or installation failure) and

the necessary software not installed.

D Optical cable

Check that the optical cable is free from excessive force and that it is not

excessively bent. Check that the optical cable is connected firmly.

If no problems are found with the connection of the optical cable, replace

the optical cable.

D Connection on the LCD

Check that the backlight and LCD cables are connected firmly to the

unit

corresponding connectors.

These cables are connected before shipment from FANUC. This check

is, however, required because the cables may be disconnected during

maintenance.

D Display control card

Check that the display control card installed on the main CPU board is

engaged with the connector. If it is engaged properly, replace this card.

D LCD unit

Replace the LCD unit or the control printed circuit board located at the

rear of the LCD unit

752

11. TROUBLESHOOTING

B-63525EN/02

11.8

THE DISPLAY ON

THE LCD UNIT

FLASHES

Causes and actions

This situation can occur only with the stand-alone type.

If a break is detected in the optical cable (HSSB) that connects the LCD

unit to the main CPU board, the display on the LCD unit flashes.

The same situation occurs if the main CPU board is turned off while the

power is on.

D Power supply of the

The display on the LCD unit flashes if the main CPU board is turned off,

main CPU board

with the LCD kept on, while the power is on.

D Break of the optical

Check that the optical cable is free from excessive force and that it is not

cable

excessively bent.

If no problems are found with the connection of the cable, replace the

optical cable.

D Display control card

Replace the display control card installed on the main CPU board.

D LCD unit

Replace the LCD unit or the control printed circuit board located at the

rear of the LCD unit

D Installation position of

the display control card

Display control

card

754

B-63525EN/02

11.TROUBLESHOOTING

11.9

INPUT FROM AND

OUTPUT TO I/O

DEVICES CANNOT

BE PERFORMED

INPUT/

OUTPUT CANNOT BE

PERFORMED

PROPERLY

Causes and actions

If the I/O Link is not established, if the signals from an I/O device cannot

be input normally to the CNC, or if the signals from the CNC cannot be

output to an I/O device, the probable causes include the following:

D The I/O device is not turned on, or the power supply is not at the

appropriate voltage.

D The I/O Link cable is not connected correctly or appropriately.

D The input/output signals are not connected correctly.

D I/O Link allocation is not performed, or is not performed properly.

D PMC alarm NO I/O

If “NO I/O DEVICE” is displayed on the alarm screen of the PMC, no I/O

DEVICE

devices are recognized.

D IOCHK screen of the

By selecting [PMCDGN], [IOCHK], and [IOLNK] in this order from the

PMC

PMC screen, the I/O devices recognized by the CNC are displayed. From

this screen, the devices that are connected normally can be determined.

Screen display example

GROUP ID

KIND OF UNIT00

I/O MODULE01

OTHER UNIT

This example indicates that the I/O Link is as shown in the figure below.

I/O module for

Control unit

connector panel

Group 0

Operator’s panel

I/O module

Group 1

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11. TROUBLESHOOTING

B-63525EN/02

D Checking the power

Check that the connected I/O devices are connected properly to the power

supplies of the I/O

supplies and that the voltages are as prescribed.

devices

Check that the power-on sequence is correct.

Time at which an I/O device is to be turned on

Before the CNC is turned on or within 500 ms after the CNC is

turned on

When the CNC is turned off, the I/O devices must also be turned off.

(Otherwise, the I/O Link may not be established the next time the CNC

is turned on.)

D Connection of cables

As in the example shown on the previous page, I/O Link cables are used

to connect JD1As and JD1Bs.

JD1A represents an upper unit while JD1B represents a lower unit.

Check that the cables are connected correctly.

D Connection of I/O signals

Check that the input/output signals to be connected to each I/O device are

connected correctly.

For operator’s panel I/O modules and for connector panel I/O modules,

also check that the 0 V or +24 V input signal is connected to the common

pin and that the +24 V output signal is connected to the DO common pin.

D I/O Link allocation

Check that I/O Link allocation has been performed correctly.

Selecting [EDIT] and then [MODULE] from the PMC screen causes the

allocation edit screen to be displayed.

After editing allocation, write the changes to the FROM on the [I/O]

screen. Otherwise, the changes will be lost when the power is turned off.

The checking of allocation requires a Ladder editing card.

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B-63525EN/02

11.TROUBLESHOOTING

11.10

IN A CONNECTOR

PANEL I/O UNIT,

DATA IS INPUT TO

AN UNEXPECTED

ADDRESS

If data is input to an invalid address in a connector panel I/O unit (for

example, data that should be input to X004 is actually input to X010 in

a connector panel I/O unit), the most likely causes are as follows:

(1) The I/O Link allocation is wrong.

→ Perform the check described in Section 11.4.

(2) The unit-to-unit cables

(CA52-to-CA53) are not connected

correctly.

If the connection is wrong, expansion unit 1 is allocated the address

of expansion unit 3, as shown below.

→ Connect the unit-to-unit cables as shown below:

Correct connection (the allocation starts with X0)

CA52

CA53 CA52

CA53

Basic

Expansion 1

Expansion 2

Expansion 3

X0-2

X3-5

X6-8

X9-11

Incorrect connection (the allocation starts with X0)

CA52

CA52 CA53

CA53 CA52

CA53

Basic

Expansion 1

Expansion 2

Expansion 3

X0-2

X9-11

X6-8

X3-5

(3) The setting of the rotary switch on an expansion unit is wrong

If the rotary switch is set to 1, one unit number is skipped. If set to 2,

two unit numbers are skipped. Usually, the setting must be 0.

(For

those units without a rotary switch, unit numbers cannot be skipped.)

→ See the following example and refer to the “FANUC Series

16i/18i/21i-B Connection Manual (Hardware)” (B-63523EN).

Example)

Rotary switch setting on expansion unit 1=1

CA52

CA53

Basic

Expansion 1

X0-2

X6-8

<=X3 to X5 are skipped.

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11. TROUBLESHOOTING

B-63525EN/02

The most likely cause is that power is not being supplied to the expansion

11.11

unit.

IN A CONNECTOR

→ Check whether 24-V power is supplied to 18P and 50P of the

PANEL I/O UNIT, NO

expansion unit, DI and DO signals are not input and output.

DATA IS OUTPUT TO

→ Check whether 24-V power is supplied to 1P and 3P of the expansion

AN EXPANSION UNIT

unit, when DI signals are input and DO signals are not output.

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11.TROUBLESHOOTING

11.12

ALARM 85 TO 87

(READER/PUNCHER

(START)

INTERFACE ALARM)

YES

Alarm 85?

· Check baud rate

and other I/O pa

rameters

YES

· I/O device is

Alarm 86?

faulty

Is I/O

parameter

correct?

YES

Set correct parameters

OFF

Is power of I/O ?

Turn on I/O device

Is cable

connection right?

YES

Connect the cable

· I/O device is faulty

· Mother board or

serial communica-

tion board is faulty

Alarm 87?

· I/O device is faulty

· Mother board or

serial communica-

tion board is faulty

Causes

(a) Parameters on reader/puncher interface are not correct.

Check the following setting data and parameters.

(b) External I/O device or host computer is faulty.

(d) Cable between NC and I/O device is faulty.

Countermeasures

(a) Parameters on reader/puncher interface are not correct.

Check the following setting data and parameters:

PUNCH CODE=0 OR 1 (0: EIA,1:ISO)

Select ISO or EIA according to the type of I/O device.

If punch code does not match, alarm 86 will generate.

759

11. TROUBLESHOOTING

B-63525EN/02

Value of parame-

ter 0020

Function

Feed

0101#7

0111#7

0121#7

0131#7

Data input code

0101#3

0111#3

0121#3

0131#3

Stop bit

0101#0

0111#0

0121#0

0131#0

Type of I/O device

102

112

122

132

Baud rate

103

113

123

133

Commu-

0135#3

nication

method

RS-232C

RS-422

SERIAL COMMUNICA-

MOTHER BOARD

TION BOARD

Connector

JD36A

JD36B

JD28A

JD6A

NOTE

Numbers in the table indicate parameters and bit numbers.

Example) 101#7: bit7 of parameter 101.

For data communications by RS-422, refer to parameters

134 and 135.

0101

NFD

ASI

SB2

0111

0121

0131

#7(NFD)

0 : Feed is output before and after data in data output (FANUC PPR)

1 : Feed is not output (standard).

#3(ASI)

0 : Data input code is EIA or ISO (automatic recognition)

1 : Data input code is ASCII.

#0(SB2)

0 : No. of stop bits is 1.

1 : No. of stop bits is 2.

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11.TROUBLESHOOTING

0102

Type of I/O device

0112

0122

Value

TYPE OF I/O DEVICE

0132

RS-232-C (if the following units are not used)

FANUC CASSETTE B1/B2 (bubble cassette)

FANUC CASSETTE F1 (Old type FLOPPY CASSETTE ADAP-

TOR)

FANUC PROGRAM FILE Mate,

FANUC FA CARD ADAPTOR

FANUC FLOPPY CASSETTE ADAPTOR,

FANUC SYSTEM P-MODEL H,

FANUC Handy File

Not used

Portable tape reader

FANUC PPR, FANUC SYSTEM P-MODEL G,

FANUC SYSTEM P-MODEL H

0103

Baud rete

0113

0123

Value

Baud rate

4800

0133

600

9600

1200

19200

2400

When bit#3 of parameter no. 0135=1 (RS-422 interface), the following

setting is also available.

Value

Baud rate

38400

76800

86400

Check the following parameters also, when parameter no.0020 is 3.

0134

CLK

NCD

SYN

PRY

#5(CLK)

0 : Internal clock is used for baud rate clock of RS-422 interface.

1 : External clock is used for baud rate clock of RS-422 interface.

#4(NCD)

0 : CD (signal quality detection) of RS-232C interface is checked.

1 : CD (signal quality detection) of RS-232C interface is not checked.

#2(SYN)

0 : In protocol B, NC reset/alarm is not informed to the host.

1 : In protocol B, NC reset/alarm is informed to the host by SYN and

NAK code.

#1(PRY)

0 : No parity bit

1 : With parity bit

761

11. TROUBLESHOOTING

B-63525EN/02

0135

RMS

R42

PRA

ETX

ASC

#7(RMS)

In protocol A, status of remote / tape operation of SAT command is

0 : Always transmitted by 0.

1 : Transmitted by the contents of remote / tape switching request issued

by SET command from the CNC.

#3(R42)

0 : Interface is of RS-232C.

1 : Interface is of RS-422.

#2(PRA)

0 : Communication protocol is protocol B

1 : Communication protocol is protocol A

#1(ETX)

0 : End code of protocol A or extended protocol A is CR of ASCII/ISO.

1 : End code of protocol A or extended protocol A is ETX of ASCII/ISO.

#0(ASC)

0 : All the communication codes except for NC data is ISO code.

1 : All the communication codes except for NC data is ASCII code.

(b) External I/O device or Host computer is in trouble

(i)

Check whether the setting on communication of external I/O

device or host computer is the same as that of the CNC. (baud

rate, stop bits,etc.) If they are not the same, change the setting.

(ii)

When spare I/O device presents, check whether it is possible to

realize communication using the spare I/O device.

(i)

When parameter no.0020 is 0 or 1 or 2 (JD36A,JD36B of Main

CPU board) Replace the module since spindle module may be

faulty.

(ii)

When parameter no. 0020 is 3 (JD28A,JD6A of option 1 board)

Because communication control module (5) may be faulty,

replace the module.

(d) Cable between NC and I/O device is faulty.

Check the cable for disconnection or wrong connection.

Mother board

R232C(JD36A)

Punch panel

R232C(JD36B)

Tape reader

Serial

R232C(JD28A/JD5L)

communication

Host computer

R232C(JD6A/JD6L)

Host computer

762

B-63525EN/02

11.TROUBLESHOOTING

< Cable connection>

R232C

(JD36A)

(JD36B)

Punch panel

(JD5L)

(01)

(03) RD

(02)

(03)

(06) DR

(04)

(05)

(05) CS

(06)

(07)

(08) CD

(08)

(09)

+24V (10)

(11)

(02) SD

(12)

(13)

(20) ER

(14)

(15)

(04) RS

(16)

(07) SG

(17)

(18)

+24V (19)

(25) +24V

(20)

(01) FG

Shield

Connector :DBM-25S

Connector : Half-pitch 20-pins (PCR)

R232C

(JD28A)

Host computer

(01)

(02) SD

(02)

(03)

(20) ER

(04)

(05)

(04) RS

(06)

(07)

(08) CD

(08)

(09)

+24V (10)

(11)

(03) RD

(12)

(13)

(06) DR

(14)

(15)

(05) CS

(16)

(07) SG

(17)

(18)

+24V (19)

(25) +24V

(20)

(01) FG

Shield

Connector D-SUB 25 pins

Connector : Half-pitch 20-pins (PCR)

763

11. TROUBLESHOOTING

B-63525EN/02

CAUTION

When CS is not used, connect it to RS.

For protocol A or extended protocol A: When DR is not used,

connect it to ER. Always connect CD to ER.

RS422

(JD6A)

(JD6L)

Host computer

RD (01)

(04) RD

*RD (02)

(22) *RD

RT (03)

(17) TT

*RT (04)

(35) *TT

CS (05)

(07) RS

*CS (06)

(25) *RS

DM (07)

(12)

Note) *DM (09)

(30) *TR

0V (08)

(19) SG

(+24V) (10)

SD (11)

(06) RD

*SD (12)

(24) *RD

TT (13)

(08) RT

*TT (14)

(26) *RT

RS (15)

(09) CS

*RS (16)

(27) *CS

TR (17)

(11) DM

*TR (18)

(29) *DM

(+24V) (19)

(20)

(01) FG

Shield

Connector : Half-pitch 20 pins (PCR)

Connector : D-SUB 25 pins

CAUTION

Always use a twisted pair cable.

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B-63525EN/02

11.TROUBLESHOOTING

11.13

ALARM 90

(REFERENCE

POSITION RETURN

IS ABNORMAL)

Contents

Reference position return was executed when the following condition is

not satisfied:

The CNC received one rotation signal at least one time when the axis is

moving to the reference position at a speed higher than a speed equivalent

to 128 pulses of position error amount(DGN300).

Countermeasures

(START)

Position error

Check whether position gain is greater than 128 pulses

amount : DGN 300

(DGN 300) before or during reference position return.

YES

128 or more

(1) Next page

Raise the speed

Check feed rate command:

PRM 1420 F : Rapid traverse rate

(mm/min)

PRM 1424

Manual rapid traverse rate (mm/min)

PRM 1825 G : Servo loop gain

(0.01sec^-1)

5000/3

Position error=

G detection unit[µm/PLUSE]

Detection unit : Move amount to a command pulse (usually 1µm)

In metric machine, if the no. of digits below decimal point is 4 on the position

display screen, detection unit is 0.1 µm.

Check rapid traverse override signals :

ROV1

DGN

014.0

ROV1

ROV2

Override

1014.0 (For two-

path control)

100%

ROV2

DGN

014.1

50%

1014.1 (For two-

25%

path control)

Fo rate

PRM

1421

Fo rate

Check reference position return deceleration signal

DEC1 to DEC8 DGN 009.0 to 009.7

When reference position return is started from deceleration signal 0, feed rate

becomes FL rate.

PRM 1425 FL rate

765

11. TROUBLESHOOTING

B-63525EN/02

(1)

Check whether the motor ratated more than one rota-

tion (one rotation signal is issued ) at faster than 128

pulses of position error amount.

Return start position is too close

Rotated ?

· Chagne the return start position.

· Move the machine at faster that 128

YES

pulses for more than one rotation to

wards RP.

Check that voltage of pulse coder is higher than 4.75 V.

To measure pulse coder voltage, remove the motor cover and measure on

pulse coder PCB at across + and - or +5V and 0V terminals.

More than 4.75V

YES

Hardware failure

Pulse coder power voltage is low

· Pulse coder is faulty

Change pulse coder or motor

CAUTION

After the pulse coder or motor is exchanged, reference

position or machine’s standard point may be different from

former one. Please set it correctly.

D Reference

A speed more than 128 pulses is required because if speed is lower that

this, one-rotation signal does not function stably, causing improper

position detection.

If bit 0 of parameter No. 2000 is set to 1, a speed corresponding to a

positional deviation of 1280 pulses or more is required.

Parameter No. 1836 can be set to 128 or less, as the minimum positional

deviation with which reference position return is possible.

(If the

parameter is set to 0, 128 is assumed as the minimum positional deviation.

If bit 0 of parameter No. 2000 is set to 1, a value equal to ten times the

set value is used for checking.)

766

B-63525EN/02

11.TROUBLESHOOTING

Absolute position data in the serial pulse coder was lost.

11.14

(This alarm will be generated when serial pulse coder is exchanged or

ALARM 300

position feedback signal cable of the serial pulse coder is disconnected).

(REQUEST FOR

REFERENCE

POSITION RETURN)

Remedies

Machine position must be memorized using the following method:

D When reference position

(1) Execute manual reference position return only for an axis for which

return function is

this alarm was generated.When manual reference position return

present

cannot be executed because of an another alarm, set parameter 1815#5

to 0 and release the alarm and perform manual operation.

(2) Press

RESET

key at the end of reference position return to release the

alarm.

D When reference position

Execute dogless reference position setting to memorize the reference

return function is not

position.

present

D When serial pulse coder

Since the reference position is different from the former one, change the

is changed

grid shift value (PRM 1850) to correct the position.

Related parameters

1815

APC x

APZx

#5(APCx)

0 : Position detector is incremental pulse coder.

1 : Position detector is absolute pulse coder.

#4(APZx)

Reference position of absolute pulse coder is :

0 : not established

1 : established

767

11. TROUBLESHOOTING

B-63525EN/02

11.15

ALARM 401

(V READY OFF)

Causes and actions

This alarm is issued if the servo ready signal (VRDY) of a servo amplifier

does not turn on or if the signal turns off during operation.

There are cases in which this alarm is issued because another servo alarm

is issued. If this occurs, first take the action for the first alarm.

Check the power magnetic circuit around the amplifier. The servo

amplifier or the axis control cards on the CNC may be defective.

D VRDY

CNC

Servo amplifier

(main CPU board)

MCON: From the CNC to the servo amplifier

(sub-CPU board)

(Turn MCC on to request the activation of the

servo motor)

VRDY: From the servo amplifier to

the CNC

(Notifies that the servo is ready)

The exchange of this information is performed via the FSSB (optical

cable).

768

B-63525EN/02

11.TROUBLESHOOTING

D Example of connection

around the amplifier

(Typical example)

(servo

amplifier) amplifier)

Control

power

supply

Emergency stop

circuit

Serial spindle

Servo

Spindle

motor

3-phase

Breaker

reactor

Single-

phase

Breaker

Check items

D Is the PSM control power supply on?

D Has an emergency stop been canceled?

D Is a terminating connector connected to the JX1B connector of the

terminating amplifier?

D Is MCC on? If there is an external MCC sequence in addition to the

MCC contact of the PSM, check that sequence also.

D Is the power for driving MCC supplied?

D Is the breaker on?

D Has some alarm been issued in the PSM or SPM?

D Replacing the servo

If no problem is found in the power magnetic circuit around the amplifier,

amplifier

replace the servo amplifier.

D Replacing the axis

If the above action does not solve the problem, replace the axis control

control cards

cards.

769

11. TROUBLESHOOTING

B-63525EN/02

11.16

ALARM 404

(V READY ON)

Causes and actions

This alarm is issued if the servo ready signal (VRDY) of a servo amplifier

remains on.

The servo amplifier or the axis control cards on the CNC may be

defective.

D VRDY

CNC

Servo amplifier

(main CPU board)

MCON: From the CNC to the servo amplifier

(sub-CPU board)

(Turn MCC on to request the activation of the

servo motor)

VRDY: From the servo amplifier to

the CNC

(Notifies that the servo is ready)

The exchange of this information is performed via the FSSB (optical

cable).

This alarm is issued if VRDY remains on when the CNC turns MCON

off or if VRDY turns on before the CNC turns MCON on.

D Replacing the servo

The servo amplifier may be defective. Replace the servo amplifier.

amplifier

D Replacing the axis

If replacing the servo amplifier does not solve the problem, replace the

control cards

axis control cards.

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B-63525EN/02

11.TROUBLESHOOTING

11.17

ALARM 462

(SEND CNC DATA

FAILED)

ALARM 463

(SEND SLAVE DATA

FAILED)

Causes and actions

Alarm 462 is issued if a slave (servo amplifier) cannot receive correct data

due to an FSSB communication error.

Alarm 463 is issued if the CNC cannot receive correct data due to an FSSB

communication error.

If these alarms are issued, the alarm message indicates the number of the

defective axis (axis name).

D Servo amplifier or optical

Any of the optical cables between the CNC control unit and the amplifier

cable

corresponding to the axis number indicated in the alarm message may be

defective.

Or, any of the first amplifier to the amplifier corresponding to that axis

number may be defective.

D Axis control cards

The axis control cards installed on the CNC may be defective.

775

11. TROUBLESHOOTING

B-63525EN/02

Digital servo parameters are abnormal.

11.18

(Digital servo parameters are set incorrectly.)

ALARM 417 (DIGITAL

SERVO SYSTEM IS

ABNORMAL)

D Causes

Confirm the setting value of the following parameters:

PRM 2020 : Motor format number

PRM 2022 : Motor rotation direction

PRM 2023 : Number of pulses of velocity feedbacks

PRM 2024 : Number of pulses of position feedback

PRM 1023 : Servo axis number

PRM 2084 : Flexible feed gear ratio

PRM 2085 : Flexible feed gear ratio

Confirm the details with diagnosis function of CNC side.

Change the setting of this parameter to 0.

PRM 2047 : Observer parameter

Perform initial setting of digital servo parameters.

Refer to setcion 6.1 “Initial Setting of Servo Parameters” .

This data indicates the cause of servo alarm No. 417, detected by the NC.

If the alarm is detected by the servo, the PRM bit (bit 4 of DGN No. 0203)

is set to 1.

0280

AXS

DIR

PLS

PLC

MOT

#0(MOT) :

The motor type specified in parameter No. 2020 falls outside the

predetermined range.

#2(PLC) :

The number of velocity feedback pulses per motor revolution, specified in

parameter No. 2023, is zero or less. The value is invalid.

#3(PLS) :

The number of position feedback pulses per motor revolution, specified in

parameter No. 2024, is zero or less. The value is invalid.

#4(DIR) :

The wrong direction of rotation for the motor is specified in parameter No.

2022 (the value is other than 111 or -111).

#6(AXS) :

In parameter No. 1023 (servo axis number), a value that falls outside the

range of 1 to the number of controlled axes is specified. (For example, 4 is

specified instead of

3.)

Alternatively, the values specified in the

parameter are not consecutive.

778

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11.TROUBLESHOOTING

11.19

ALARM 700

(OVERHEAT:

CONTROL UNIT)

Causes and actions

This alarm is issued if the ambient temperature of the CNC control unit

is abnormally high. As an installation condition, the ambient temperature

of the CNC must not exceed 58°C (for LCD-mounted type CNC) or 55°C

(for stand-alone type CNC).

D Ambient temperature

A temperature monitoring circuit is installed on the motherboard (main

CPU board), and causes this alarm to be issued if the ambient temperature

is abnormally high.

Take appropriate action to the cabinet that houses the CNC control unit

so that the temperature falls within the proper temperature range (0 to

58°C (for LCD-mounted type CNC) or 0 to 55°C (for stand-alone type

CNC).

If it is obvious that the ambient temperature is not abnormal, the

motherboard (main CPU board) may be defective.

779

11. TROUBLESHOOTING

B-63525EN/02

11.20

ALARM 701

(OVERHEAT: FAN

MOTOR)

Causes and actions

This alarm is issued if a fault occurs in any of the fan motors, such as the

stoppage of a fan motor during the operation of the CNC.

D Fan motors

Fan motors are installed in the uppermost portion of the CNC control unit.

Each fan motor is attached with an alarm detector circuit, which notifies

the CNC of a fault such as the stoppage of the fan motor, thereby issuing

this alarm.

If this alarm is issued, replace the fan motor.

[For the LCD-mounted type]

For units without option slots

Fan motor

Specifications of fan motors

Ordering

Quantity

information

required

Unit without option slots

A02B-0236-K120

Two

Unit with two option slots

A02B-0281-K121

Two

Unit with three option slots

A02B-0281-K121

Two

A02B-0236-K122

Two

Unit with four option slots

A02B-0281-K121

Four

780

FANUC Series 16i/160i/160is-MODEL B, Series 18i/180i/180is-MODEL B, Series 21i/210i/210is-MODEL B. MAINTENANCE MANAUL - page 27