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FANUC Series 16i/160i/160is-MODEL B, Series 18i/180i/180is-MODEL B, Series 21i/210i/210is-MODEL B. MAINTENANCE MANAUL - page 26

B-63525EN/02

11.TROUBLESHOOTING

When a failure occurs, it is important to correctly grasp what kind of

11.1

failure occured and take appropriate action, to promptly recover the

CORRECTIVE

machine.

ACTION FOR

Check for the failure according to the following procedure :

FAILURES

With what

When?

What failure?

operation?

Grasp the kind of failure

↓

Appropriate action

↓

Recovery

11.1.1

Investigating the

(1) When and how many times (frequency of occurrences)

Conditions Under

(2) With what operation

(3) What failure occurred

which Failure Occurred

1

When did the failure occur?

⋅

Date and time?

⋅

Occurred during operation? (how long was the operation?)

⋅

Occurred when the power was turned on?

⋅

Was there any lightening surge, power failure, or other disturbances

to the power supply?

How many times has it occurred

⋅

Only once?

⋅

Occurred many times ? (How many times per hour, per day, or per

month?)

2

With what operation did it occur ?

⋅

What was the NC mode when the failure occurred?

Jog mode/memory operation mode /MDI mode /reference position

return mode

⋅

If during program operation,

1) Where in the program ?

2) Which program No. and sequence No. ?

3) What program ?

4) Occurred during axial movement ?

5) Occurred during the execution of an M/S/T code ?

6) Failure specific to the program ?

⋅

Does the same operation cause the same failure ?

(Check the repeatability of the failure.)

⋅

Occurred during data input/output ?

<Feed axes and spindles>

⋅

For a failure related to feed axis servo

1) Occurred at both low feedrate and high feedrate ?

2) Ocurred only for a certain axis ?

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11.TROUBLESHOOTING

11.2

NO MANUAL OPERA-

TION NOR AUTOMAT-

IC OPERATION CAN

BE EXECUTED

Points

(1) Execute the following procedure when no manual nor automatic

operation is done

(2) Check whether position display shows correct position

(3) Check CNC status display

(4) Check CNC internal status using diagnostic function

Causes and

Countermeasures

1. Position display

(1) Check CNC status display (Refer to Section 1.9 CNC STATUS

(relative, absolute,

DISPLAY for detail.)

machine coordinate)

(a) Emergency stop status (Emergency stop signal is turned on)

does not change

If status display shows

EMG

the emergency stop signal is input.

Check the following signal using the PMC’s diagnostic function

(PMCDGN).

#7

#6

#5

#4

#3

#2

#1

#0

X1008

*ESP

G0008

*ESP

ESP=0 indicates that emergency stop signal is input.

(b) It is a reset status

When RESET is displayed, any of a reset is functioned. Check the

following signal using the PMC’s diagnostic funciton

(PMCDGN).

1) An input signal from the PMC functions

#7

#6

#5

#4

#3

#2

#1

#0

G0008

ERS

RRW

When ERS is 1, external reset signal is input.

When RRW is 1, reset & rewing signal is input.

2) RESET key on the MDI keyboard functions

When the signals in 1) are 0,

RESET

key may be functioning.

Check the contact of

RESET

key using a tester.

When it is abnormal, change the keyboard.

727

11. TROUBLESHOOTING

B-63525EN/02

(c) Confirm the status of modes

Operation mode status is displayed on the lower part of CRT as

follows :

If nothing is displayed, mode select signal is not input. Check mode

select signal using PMC’s diagnostic function (PMCDGN).

For details, refer to section 1.9 CNC STATUS DISPLAY.

(Example of display)

JOG : Manual operation (JOG) mode

HND : Manual handle (MPG) mode

MDI : Manual data input (MDI) mode

MEM : Automatic operation (Memory) mode

EDIT: EDIT (Memory edit) mode

<Mode select signal>

#7

#6

#5

#4

#3

#2

#1

#0

G0043

MD4

MD2

MD1

↓

↓

↓

Manual operation (JOG) mode

1

0

1

Manual handle (MPG) mode

1

0

0

Manual data input (MDI) mode

0

0

0

Automatic operation (Memory) mode

0

0

1

EDIT (Memory edit) mode

0

1

1

(2) Check diagnostic data 000 to 025 of the CNC Check an item for which

1 is displayed

No. Message

Display

000

WAITING FOR FIN SIGNAL

: 0

001

MOTION

: 0

002

DWELL

: 0

a.003

IN-POSITION CHECK

: 0

004

FEEDRATE OVERRIDE 0%

: 0

b.005

INTERLOCK / START LOCK

: 1 (Example)

006

SPINDLE SPEED ARRIVAL CHECK

: 0

010

PUNCHING

: 0

011

READING

: 0

012

WAITING FOR (UN) CLAMP

: 0

c.013

JOG FEEDRATE OVERRIDE 0%

: 0

d.014

WAITING FOR RESET, ESP, RRW OFF

: 0

015

EXTERNAL PROGRAM NUMBER SEARCH : 0

Items with a to d relate with manual and automatic operation and its

detail is shown below.

728

B-63525EN/02

11.TROUBLESHOOTING

a. In-position check is

It shows that positioning is not yet completed. Check the contents of the

being done

following diagnostic number. (It is 1 in the following condition)

DGN 0300

Position Error

>PARAM 1826

In-position width

1) Check the parameters according to the parameter list.

1825

Servo loop gain per axis

(Normal : 3000)

2) Servo system may be abnormal. Refer to servo alarm 400, 410, and

411.

b. Interlock or start lock

There are a plural interlock signals. Check at first which interlock signal

signal is input

is used by the machine tool builder at the parameters shown below.

#7

#6

#5

#4

#3

#2

#1

#0

3003

DAU

DIT

ITX

ITL

#0 ITL=0 shows interlock signal *IT is effective. To 1)

#2 ITX=0 shows interlock signal *ITn is effective. To 2)

#3 DIT=0 shows interlock signal "MITn is effective. To 3)

#4 DAU=When it is “1,” the interlock signal ("MITn) is effective

even in automatic operation.

Go to 3).

Check state of effective interlock signals using the diagnostic function

(PMCDGN) of the PMC.

1)

Interlock signal (*IT) is input.

#7

#6

#5

#4

#3

#2

#1

#0

G0008

*IT

*IT=0 shows that interlock signal is input.

2)

Axis interlock signal (*ITn) is input.

#7

#6

#5

#4

#3

#2

#1

#0

G0130

*IT8

*IT7

*IT6

*IT5

*IT4

*IT3

*IT2

+IT1

*ITn=0 shows interlock signal is input.

3)

Interlock signal per axis and direction ("MITn) is input.

D M series

#7

#6

#5

#4

#3

#2

#1

#0

G0132

+MIT4

+MIT3

+MIT2

+MIT1

G0134

-MIT4

-MIT3

-MIT2

-MIT1

D T series

#7

#6

#5

#4

#3

#2

#1

#0

X0004

-MIT2

+MIT2

-MIT1

+MIT1

"MITn=1 shows interlock signal per axis and direction is input.

* In T series, "MITn is effective only when the manual operation is

used.

729

11. TROUBLESHOOTING

B-63525EN/02

c. Jog feedrate override is

Check the signals using PMC’s diagnostic function (PMCDGN)

0%

#7

#6

#5

#4

#3

#2

#1

#0

G0010

*JV7

*JV6

*JV5

*JV4

*JV3

*JV2

*JV1

*JV0

G0011

*JV15

*JV14

*JV13

*JV12

*JV11

*JV10

*JV9

*JV8

When the override is 0% all bits of the above address becomes

1111

1111 or 0000

0000.

*JV15 .

JV0

Override

1111 1111 1111 1111

0.00%

1111 1111 1111 1110

0.01%

:

:

1101 1000 1110 1111

100.00%

:

:

0000 0000 0000 0001

655.34%

0000 0000 0000 0000

0.00%

d. NC is in a reset state

In this case, RESET is also displayed on the status display. Check it using

the procedure of b above.

2. When machine

(1) Machine lock signal (MLK) is input.

coordinate value does

not update on position

display

#7

#6

#5

#4

#3

#2

#1

#0

G0044

MLK

G0108

MLK8

MLK7

MLK6

MLK5

MLK4

MLK3

MLK2

MLK1

MLK : All axes machine lock

MLKn : Each axis machine lock

When the signal is 1, the corresponding machine lock signal is input.

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11.TROUBLESHOOTING

11.3

JOG OPERATION

CANNOT BE DONE

Points

(1) Check whether position display is operating.

(2) Check CNC status display.

(3) Check internal status using Diagnostic funciton.

Causes and Remedies

1. Position display

(1) Check mode selection status (JOG mode is not selected).

(relative, absolute,

When status display shows JOG, it is normal.

machine cooordinate)

When status display does not show JOG, mode select signal is not

does not change

selected correctly. Confirm the mode select signal using PMC’s

diagnostic function (PMCDGN).

<Mode select signal>

#7

#6

#5

#4

#3

#2

#1

#0

G0043

MD4

MD2

MD1

↓

↓

↓

Manual operation (JOG) mode

1

0

1

(2) Feed axis and direction select signal is not input Check the signal using

PMC’s diagnostic function (PMCDGN).

#7

#6

#5

#4

#3

#2

#1

#0

G0100

+J8

+J7

+J6

+J5

+J4

+J3

+J2

+J1

G0102

-J8

-J7

-J6

-J5

-J4

-J3

-J2

-J1

G0086

-Ja

+Ja

-Jg

+Jg

When a bit is “1”, the corresponding feed axis direction

selection signal has been entered.

)

J

g

:

Both X- and Y-axes simultaneously (feed along a straight line or circle)

a

:

Both X- and Y-axes simultaneously (feed in the normal direction)

) : Feed in the ) direction

* : Feed in the * direction

Example)

In the normal state, pressing the “+X” button on the operator’s panel

causes the signal +Jn to be displayed as “1”.

* This signal becomes effective when the rise of the signal is

detected. If, therefore, the direction selection signal has been

entered before jog mode selection, axis movement is not

performed; set the bit “0” and then re-check the signal.

731

B-63525EN/02

11.TROUBLESHOOTING

a. In-position check is

It shows that positioning is not yet completed. Check the contents of the

being done

following diagnostic number. (It is 1 in the following condition)

DGN 0300

Position Error

>PARAM 1826

In-positio width

1) Check the parameters according to the parameter list.

1825

Servo loop gain per axis

(Normal : 3000)

2) Servo system may be abnormal. Refer to servo alarm 400, 410, and

411.

b. Interlock or start lock

There are a plural interlock signals. Check at first which interlock signal

signal is input

is used by the machine tool builder at the parameters shown below.

#7

#6

#5

#4

#3

#2

#1

#0

PARAM

3003

DIT

ITX

ITL

#0 ITL=0 shows interlock signal *IT is effective. To 1)

#2 ITX=0 shows interlock signal *ITn is effective. To 2)

#3 DIT=0 shows interlock signal "MITn is effective. To 3)

Check state of effective interlock signals using the diagnostic function

(PMCDGN) of the PMC.

1) Interlock signal (*IT) is input.

#7

#6

#5

#4

#3

#2

#1

#0

G0008

*IT

*IT=0 shows that interlock signal is input.

2) Axis interlock signal (*ITn) is input.

#7

#6

#5

#4

#3

#2

#1

#0

G0130

*IT8

*IT7

*IT6

*IT5

*IT4

*IT3

*IT2

+IT1

*ITn=0 shows interlock signal is input.

3) Interlock signal per axis and direction (+/- MITn) is input

⋅ M series

#7

#6

#5

#4

#3

#2

#1

#0

G0132

+MIT4

+MIT3

+MIT2

+MIT1

G0134

-MIT4

-MIT3

-MIT2

-MIT1

⋅ T series

#7

#6

#5

#4

#3

#2

#1

#0

X0004

-MIT2

+MIT2

-MIT1

+MIT1

"MITn=1 shows interlock signal per axis and direction is input.

* For the T series, "MITn is valid only for manual operation.

733

11. TROUBLESHOOTING

B-63525EN/02

c. Jog feedrate override is

Check the signals using PMC’s diagnostic function (PMCDGN)

0%

#7

#6

#5

#4

#3

#2

#1

#0

G0010

*JV7

*JV6

*JV5

*JV4

*JV3

*JV2

*JV1

*JV0

G0011

*JV15

*JV14

*JV13

*JV12

*JV11

*JV10

*JV9

*JV8

When the override is 0% all bits of the above address becomes

1111

1111 or 0000

0000.

*JV15 .

JV0

Override

1111 1111 1111 1111

0.00%

1111 1111 1111 1110

0.01%

:

:

1101 1000 1110 1111

100.00%

:

:

0000 0000 0000 0001

655.34%

0000 0000 0000 0000

0.00%

d. NC is in a reset state

In this case, RESET is also displayed on the status display. Check it using

the procedure of 1 above.

(4) Jog feed rate setting (Parameter) is not correct.

1423

Jog feedrate per axis

(5) Manual feed per revolution is selected ( T series)

This funciton feeds an axis synchronized with spindle rotation and

whether this function is used or not is selected by the following

parameter:

#7

#6

#5

#4

#3

#2

#1

#0

1402

JRV

#3 (JRV)

0 : Jog feed is of feed per minute

1 : Jog feed is of feed per revolution

(a) When parameter JRV is set to 1, feed rate of the axis is calculated

by synchronizing with rotation of the spindle. Therefore, rotate the

spindle.

(b) If the axis does not move even when the spindle is rotated, check

the detector of the spindle (position coder) and the cable between

the position coder and the CNC if it is short-circuited or

ungrounded.Refer to 2.4 for connection diagram.

(6) The specified axis is the index table indexing axis.

<M series>

For the index table indexing axis (B-axis), jog feed, incremental feed,

and manual handle feed cannot be performed.

734

B-63525EN/02

11.TROUBLESHOOTING

11.4

HANDLE OPERATION

CANNOT BE DONE

Causes and actions

If manual handle operation cannot be performed, the probable causes

include the following:

D The servo is not activated.

D Manual pulse generators are not connected properly to the I/O module.

D The I/O link of the I/O module is not allocated, or is not allocated

properly.

D A related input signal is not input due to a parameter setting error.

1

The servo is not

Check that the LED on the servo amplifier indicates “0”. If a number

activated

other than “0” is indicated, the servo is not activated. In this state, even

JOG operation and automatic operation cannot be operated.

Check the servo-related parameters and the wiring.

2

Checking the manual

(1) Cable failures (such as breaks)

pulse generators

Examine the cables for faults such as breaks and short-circuits,

referring to the figure below.

CNC

Distributed I/O module

(motherboard) Operator’s panel I/O module

First manual

JA3

#1

pulse generator

IOLINK

JD1B

(JD1A)

Second manual

#2

pulse generator

Third manual

#3

pulse generator

CNC

Distributed I/O module

Manual pulse

(motherboard)

Operator’s panel I/O module

generators

Shield

Shield

JD1A

JD1B

JA3

SIN(01)

(03)SOUT

HA1(01)

HA1

*SIN(02)

(04)*SOUT

HB1(02)

HB1

First

SOUT(03)

(01)SIN

+5V(09)

+5V

*SOUT(04)

(02)*SIN

0V(12)

0V

0V(11)

(11)0V

0V(12)

(12)0V

HA2(03)

HA2

0V(13)

(13)0V

HB2(04)

HB2

Second

0V(14)

(14)0V

+5V(18)

+5V

0V(14)

0V

HA3(05)

HA3

HB3(06)

HB3

Third

+5V(20)

+5V

0V(16)

0V

735

11. TROUBLESHOOTING

B-63525EN/02

(2) Manual pulse generator failures

When rotated, a manual pulse generator generates the signals shown

below. Using an oscilloscope, measure the signals from the screw

terminal block located at the rear of a manual pulse generator. If no

signals are output, measure the +5 V voltage.

Rear of a manual pulse generator

Screw terminal

block

HA: Manual pulse generator phase A signal

HB: Manual pulse generator phase B signal

+5V

0V HA HB

When rotated in the plus direction

When rotated in the minus direction

1 : 1

+5V

HA

On

Off

On

Off

0V

+5V

HB

On

Off

On

Off

0V

1 : 1

1/4 (phase difference)

1/4

Check the on/off ratio and the phase difference between HA and HB.

3

Allocation of the I/O link

If the I/O module is not allocated properly in I/O link allocation, the pulses

of the I/O module

of the manual pulse generators are not transmitted to the CNC, making

it impossible to perform manual handle operation.

The I/O modules to which manual pulse generators can be connected are

listed below.

Name

Specifications

I/O module for connector panel (extended module A)

A03B-0815-C002

I/O module for operator’s panel (supporting matrix input)

A20B-2002-0470

I/O module for operator’s panel

A20B-2002-0520

Interface unit for machine operator’s panel

A20B-2201-0110

Main panel A of machine operator’s panel

A02B-0236-0230

Main panel B of machine operator’s panel

A02B-0236-0231

Main panel A1 of machine operator’s panel

A02B-0236-0240

Main panel B1 of machine operator’s panel

A02B-0236-0241

If a multiple number of these modules are used and are allocated so that

they use a manual pulse generator, the module nearest the CNC becomes

effective because of the I/O link connection.

736

B-63525EN/02

11.TROUBLESHOOTING

I/O module for connec-

Control unit

Group 0

tor panel

This manual pulse

Allocated to

generator I/F is

use a manual

effective.

pulse generator

Operator’s panel I/O

module

Group 1

Allocated to

This manual pulse

use a manual

generator I/F is not

pulse generator

effective.

In this example, the manual pulse generator connected to the I/O module

for a connector panel in group 0 is effective.

I/O module for connec-

Control unit

Group 0

tor panel

This manual pulse

Allocated so as not

generator I/F is not

to use a manual

effective.

pulse generator

Operator’s panel I/O

module

Group 1

Allocated to

This manual pulse

use a manual

pulse generator

generator I/F is

effective.

If the I/O module for a connector panel in group 0 is allocated so as not

to use a manual pulse generator, as in this example, the manual pulse

generator interface of the operator’s panel I/O module in group 1 is

effective.

The allocation can be confirmed on the allocation edit screen. 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.

If allocation is performed properly, when a manual pulse generator is

rotated, the bits count up/down in the area of the corresponding input

signal (X). Select [PMCDGN] and then [STATUS] from the PMC screen

to display the corresponding address, and rotate the manual pulse

generator to check that the bits count up/down.

737

11. TROUBLESHOOTING

B-63525EN/02

4

Checking the parameters

(1) Check CNC status display at lower left corner of the CRT.

and input signals

(See Section 1.9.)

When the status display shows HND, mode selection is correct.

If it is not HND, mode select signal is not input correctly. Check the

mode select signal using the PMC’s diagnostic function(PMCDGN).

#7

#6

#5

#4

#3

#2

#1

#0

G0043

MD4

MD2

MD1

↓

↓

↓

Manuale handle mode

1

0

0

(2) Manual handle feed axis select signal is not input.

Check the signals using PMC’s diagnostic function (PMCDGN).

#7

#6

#5

#4

#3

#2

#1

#0

G0018

HS2D

HS2C

HS2B

HS2A

HS1D

HS1C

HS1B

HS1A

G0019

HS3D

HS3C

HS3B

HS3A

When axis select switch for manual handle feed is selected on the

machine operator’s panel, if the signals are input as follows, it is

normal.

Selected axis

HSnD

HSnC

HSnB

HSnA

no selection

0

0

0

0

1st axis

0

0

0

1

2nd axis

0

0

1

0

3rd axis

0

0

1

1

4th axis

0

1

0

0

5th axis

0

1

0

1

6th axis

0

1

1

0

7th axis

0

1

1

1

8th axis

1

0

0

0

NOTE

In the above table, n is the number of the manual pulse

generator

(MPG) and up to 3 MPGs can be used.

A feed axis is selected by 4-bit code of A to D.

738

B-63525EN/02

11.TROUBLESHOOTING

(3) Manual handle feed multiplication is not correct

Check the following signals using PMC’s PCDGN. Also confirm the

following parameters based on the parameter list.

#7

#6

#5

#4

#3

#2

#1

#0

G0019

MP2

MP1

In handle mode, the travel distance per step can be changed.

MP2

MP1

Step feed

Handle feed

0

0

1

1

0

1

10

10

1

0

100

Mn

1

1

1000

Nn

#7

#6

#5

#4

#3

#2

#1

#0

PARAM

7102

HNGx

#0(HNGx)

The direction of rotation of the manual pulse generator and the direction

of the travel of the machine are:

0 : Same

1 : Opposite

PARAM

7110

Number of manual pulse generators used (1 to 3).

(4) The specified axis is the index table indexing axis.

<M series>

For the index table indexing axis (B-axis), jog feed, incremental feed,

and manual handle feed cannot be performed.

739

11. TROUBLESHOOTING

B-63525EN/02

11.5

AUTOMATIC

OPERATION

CANNOT BE DONE

Points

(1) Check manual operation is possible.

(2) Check the status of cycle start LED on machine operator’s manual.

(3) Check status of CNC.

Causes and Remedies

When manual operation is either impossible, perform countermeasure,

based on the previous item “Jog operation cannot be done”.

Confirm that a correct mode is selected according to the mode select status

of CNC status display. Also, by confirming the automatic operation

status it is possible to identify cycle operation, feed hold and cycle stop

state.

1. When cycle operation is

“****” is displayed at status display on CRT.

not started (Cycle start

(1) Mode select signal is not correct.

LED does not light)

When the mode select signal is input correctly, following status

display is done.

MDI

:Manual data input mode (MDI)

MEM :Memory operation mode

RMT

:Remote operation mode

If status display does not show a correct status, check the mode signal

with following diagnosis function of PMC side (PMCDGN).

#7

#6

#5

#4

#3

#2

#1

#0

G0043

DNCI

MD4

MD2

MD1

DNCI

MD4

MD2

MD1

Mode select

–

0

0

0

Manual data input mode

0

0

0

1

Memory operation mode

1

0

0

1

Remote operation mode

(2) Cycle start signal is not input

This signal turns 1 when cycle start button is pressed and turns 0 when

it is released. The cycle start actuates when it changes from 1 to 0.

Check the state of the signal using PMC’s diagnostic

function(PMCDGN).

#7

#6

#5

#4

#3

#2

#1

#0

G0007

ST

#2 (ST)

: Cycle start signal

(3) Feed hold signal is input

Under normal state, the feed hold signal is 1 when the feed hold button

is not pressed.

Check the state of this signal using the PMC’s diagnostic function

(PMCDGN) .

#7

#6

#5

#4

#3

#2

#1

#0

G0008

*SP

#5 (*SP)

: Feed hold signal

740

B-63525EN/02

11.TROUBLESHOOTING

2. When an automatic

CNC’s status display shows “STRT” on the CRT.

operation is in progress

(1) Check the contents of diagnostic nos. 000 to 015.

(Cycle start LED is lit)

No. Message

Display

a.

000

WAITING FOR FIN SIGNAL

: 1(Example)

b.

001

MOTION

: 0

c.

002

DWELL

: 0

d.

003

IN-POSITION CHECK

: 0

e.

004

FEEDRATE OVERRIDE 0%

: 0

f.

005

INTERLOCK / START LOCK

: 0

g.

006

SPINDLE SPEED ARRIVAL CHECK

: 0

010

PUNCHING

: 0

011

READING

: 0

012

WAITING FOR (UN) CLAMP

: 0

h.

013

JOG FEEDRATE OVERRIDE 0%

: 0

i.

014

WAITING FOR RESET, ESP, RRW OFF

: 0

015

EXTERNAL PROGRAM NUMBER SEARCH

: 0

Items with a to i relate with an automatic operation and their details

are as follows :

a. An auxiliary function is

An auxiliary function (M/S/T/B) specified in a program is not ended.

being executed (waiting

Check according to the following procedure.

for FIN signal)

First, check the parameter setting to confirm the type of the interface of

the auxiliary function.

#7

#6

#5

#4

#3

#2

#1

#0

3001

HSIF

#7(HSIF)

0 : M/S/T/B is of normal interface.

1 : M/S/T/B is of high-speed interface.

1) Normal interface

When the auxiliary function finish signal turns from 1 to 0, the

auxiliary function is supposed to be ended and the next block is read

for operation. Confirm the status of this signal using PMC’s

diagnostic function(PMCDGN).

#7

#6

#5

#4

#3

#2

#1

#0

G0004

FIN

#3 (FIN)

: Auxiliary function finish signal

2) High-speed interface

The auxiliary function is supposed to be ended when the signals are

in the following state. Confirm it using PMC’s diagnostic function

(PMCDGN).

741

11. TROUBLESHOOTING

B-63525EN/02

<M series>

#7

#6

#5

#4

#3

#2

#1

#0

G0005

BFIN

TFIN

SFIN

MFIN

#0(MFIN)

: M function finish signal

#2(SFIN)

: S function finish signal

#3(TFIN)

: T function finish signal

#4(BFIN)

: 2nd auxiliary function finish signal

#7

#6

#5

#4

#3

#2

#1

#0

F0007

BF

TF

SF

MF

#0(MF)

: M function strobe signal

#2(SF)

: S function strobe signal

#3(TF)

: T function strobe signal

#7(BF)

: 2nd auxiliary function strobe signal

<T series>

#7

#6

#5

#4

#3

#2

#1

#0

G0005

BFIN

TFIN

SFIN

MFIN

#0(MFIN)

: M function completion signal

#2(SFIN)

: S function completion signal

#3(TFIN)

: T function completion signal

#4(BFIN)

: Second auxiliary function completion signal

#7

#6

#5

#4

#3

#2

#1

#0

F0007

BF

TF

SF

MF

#0(MF)

: M function strobe signal

#2(SF)

: S function strobe signal

#3(TF)

: T function strobe signal

#4(BF)

: Second auxiliary function strobe signal

<M/T series>

#7

#6

#5

#4

#3

#2

#1

#0

G0004

MFIN3

MFIN2

#4(MFIN2)

: Second M function completion signal

#5(MFIN3)

: Third M function completion signal

#7

#6

#5

#4

#3

#2

#1

#0

F0008

MF3

MF2

#4(MF2)

: Second M function strobe signal

#5(MF3)

: Third M function strobe signal

* The second and third M functions are enabled only when bit 7 (M3B)

of parameter No. 3404 is set to 1.

742

B-63525EN/02

11.TROUBLESHOOTING

Signal

End state

Finish signal

0

1

store signal

0

1

b. Travel command is being

CNC is reading an axis command (X,Y,Z,...) in a program and giving the

executed

command to the axis.

c. A dwell command is

CNC is reading a dwell command (G04) in a program and is executing

being executed

the dwell command.

d. In-position check

Positioning

(G00) to a specified position of a specified axis is not

(confirming positioning)

completed.

is being done

Whether positioning is completed or not is checked as the servo position

error amount. Check it CNC’s diagnostic function as follows:

DGN no.300

Position Error

> PARAM 1826

In-position width

Position error amount almost becomes 0, when positioning of an axis

completes and when the amount becomes within the in-posiiton width,

it is assumed that positioning completes and the next block is exected.

If position error amount does not become within the in-position width,

refer to servo alarm 400, 4n0 and 4n1.

e. Feedrate override is at

Actual feedrate is overridden by the override signals to a programmed

0%

feedrate. Check the override signals using the PMC’s diagnostic function

(PMCDGN).

<Normal override signal>

#7

#6

#5

#4

#3

#2

#1

#0

G0012

*FV7

*FV6

*FV5

*FV4

*FV3

*FV2

*FV1

*FV0

*FVn

:Feedrate override

<2nd override signal (option)>

Feed rate is overridden more finely using the signals below:

See MTB’s manual whether this feature is equipped.

#7

#6

#5

#4

#3

#2

#1

#0

G0013

*AFV7

*AFV6

*AFV5

*AFV4

*AFV3

*AFV2

*AFV1

*AFV0

*AFVn

:2nd feed rate override

<State of override signal>

*FV7@@@@@@@*FV0

*AFV7@@@@@@*AFV0

11 1 1 1 1 1 1

0%

11 1 1 1 1 1 1

0%

11 1 1 1 1 1 0

1%

11 1 1 1 1 1 0

1%

:

:

:

:

10 0 1 1 0 1 1

100%

10 0 1 1 0 1 1

100%

:

:

:

:

00 0 0 0 0 0 1

254%

00 0 0 0 0 0 1

254%

00 0 0 0 0 0 0

0%

00 0 0 0 0 0 0

0%

743

11. TROUBLESHOOTING

B-63525EN/02

f.

Interlock signal or start

<T series only>

lock signal is input

Start lock signal is input

#7

#6

#5

#4

#3

#2

#1

#0

G0007

STLK

#1 (STLK)

With this signal being 1, start lock signal is input.

<Common to T series and M series>

There are a plural number of interlock functions. Parameters are set by

machine tool builders for which interlock function is used.

Therefore, confirm the following parameters at first:

#7

#6

#5

#4

#3

#2

#1

#0

3003

DAU

DIT

ITX

ITL

#0 (ITL)

0 : Interlock signal(*IT) is valid.

#2 (ITX)

0 : Interlock signal (*ITn) is valid.

#3 (DIT)

0 : Interlock signal ("MITn) is valid.

#4 (DAU)

1 : Interlock signal ("MITn) is valid in both manual operation and

automatic operation.

Confirm which interlock signal is activated by the PMC’s diagnostic

function (PMCDGN) .

1) Interlock signal (*IT) is input

#7

#6

#5

#4

#3

#2

#1

#0

G0008

*IT

#0 (*IT)

: When this bit is 0, interlock signal is input.

2) Interlock signal per each axis (*ITn) is input

#7

#6

#5

#4

#3

#2

#1

#0

G0130

*IT8

*IT7

*IT6

*IT5

*IT4

*IT3

*IT2

*IT1

*ITn When the bit is 0, the corresponding axis’s interlock signal is input.

3) Interlock signal per axis and direction("MITn) is input

⋅ M series

#7

#6

#5

#4

#3

#2

#1

#0

G0132

+MIT4

+MIT3

+MIT2

+MIT1

G0134

-MIT4

-MIT3

-MIT2

-MIT1

⋅ T series

#7

#6

#5

#4

#3

#2

#1

#0

X0004

-MIT2

+MIT2

-MIT1

+MIT1

"MITn=1 shows interlock signal per axis and direction is input.

* For the T series, "MITn is valid only for manual operation.

4) Controlled axis detach function is running. A detached axis is

specified for travelling.

*This function is valid when CNC parameter No.1005#7=1. For

whether this function is running or not, confirm the following signal

using PMC’s diagnostic function (PMCDGN). Check the axis

concerned.

744

B-63525EN/02

11.TROUBLESHOOTING

#7

#6

#5

#4

#3

#2

#1

#0

F0110

MDTCH8

MDTCH7

MDTCH6

MDTCH5

MDTCH4

MDTCH3

MDTCH2

MDTCH1

When signal MDTHn is “1”, the axis detach function is in valid.

The control axis detach function becomes valid by the following

signal issued from the PMC or a CNC side parameter. Check as in the

following procedure :

1) The control axis detach signal (DTCHn) is input.

#7

#6

#5

#4

#3

#2

#1

#0

G0124

DTCH8

DTCH7

DTCH6

DTCH5

DTCH4

DTCH3

DTCH2

DTCH1

If it is 1, the corresponding axis is detached.

2) The following parameter enables the control axis detach function to

the corresponding axis.

#7

#6

#5

#4

#3

#2

#1

#0

0012

RMVx

#7(RMVx) 0 : Controlled axis is connected

1 : Controlled axis is detached

g. CNC is waiting for

Actual spindle speed does not arrive at a speed specified in a program.

spindle speed arrival

Confirm the signal state using the PMC’s diagnostic function

signal to be input

(PMCDGN).

#7

#6

#5

#4

#3

#2

#1

#0

G0029

SAR

#4(SAR) : When this signal is 0, spindle speed does not arrive at the specified speed.

This function is valid when PARAM 3708#0=1.

h. Manual feedrate override

Normally manual feedrate override function is used for jog feed.

is 0% (dry run)

But when DRN(dry run) signal turns on during an auomatic

operation,override values set with these signals become valid to the

following speed set by a parameter.

#7

#6

#5

#4

#3

#2

#1

#0

G0046

DRN

#7(DRN) : Dry run signal is input with this signal being 1.

1410

Dry run rate

The rate when the following override value is 100%.

#7

#6

#5

#4

#3

#2

#1

#0

G0010

*JV7

*JV6

*JV5

*JV4

+JV3

*JV2

*JV1

*JV0

G0011

*JV15

*JV14

*JV13

*JV12

+JV11

*JV10

*JV9

*JV8

745

11. TROUBLESHOOTING

B-63525EN/02

When override value is 0%, all bits of the above address is

[1111 . . .

1111] or [0000

0000].

*JV15 .

JV0

Override

1111 1111 1111 1111

0.00%

1111 1111 1111 1110

0.01%

:

1101 1000 1110 1111

100.00%

:

0000 0000 0000 0001

655.34%

0000 0000 0000 0000

0.00%

i.

NC is in a reset state

In this case, the CNC’s status display shows RESET. Refer to item 1.

(2) Only rapid traverse in positioning (G00) does not function Confirm

the following parameter and signals from the PMC.

(a) Setting value of rapid traverse rate

1420

Rapid traverse rate per axis

(b) Rapid traverse override signals

#7

#6

#5

#4

#3

#2

#1

#0

G0014

ROV2

ROV1

G0096

HROV

*HROV6

*HROV5

*HROV4

*HROV3

*HROV2

*HROV1

*HROV0

(HROV-0)

(HROV=1)

ROV1

ROV2

Override

*HROV6

*HROV0

Override

0

0

100%

1 1

1

1

1

1

1

0%

1

1

50%

1 1

1

1

1

1

0

1%

0

1

25%

:

:

1

1

Fo

0 0

1

1

0

1

1

100%

1421

Rapid traverse override F0 rate

(3) Only feed (other than G00) does not function

(a) Maximum feedrate set by parameter is incorrect.

1422

Maximum feedrate

Feedrate is clamped at this upper feedrate.

(b) Feedrate is specified by feed per revolution (mm/rev)

1) Position coder does not rotate

Check the connection between spindle and position coder

The following failure is considered:

⋅

T iming belt is broken

⋅

Key is removed

⋅

Coupling is loose

⋅

Connector of signal cable is loosened

2) Position coder is faulty

746

B-63525EN/02

11.TROUBLESHOOTING

(c) Thread cutting does not operate

1) Position coder does not rotate

Check the connection between spindle and position coder

The following failure is considered:

⋅

Timing belt is broken

⋅

Key is removed

⋅

Coupling is loose

⋅

Connector of signal cable is loosened

2) Position coder is faulty

Position coder is connected to the spindle amplifier when serial

interface spindle is used or connected to the CNC when analog

interface spindle is used.

For details of connection, refer to the following.

<T series>

Whether A/B phase signals from the position coder are read

correctly, can be judged also by the spindle speed display on the

CRT screen (position screen). (However, it is not displayed

when PARAM 3105#2=0).

<αi series spindle amplifier>

Position

CNC

coder

JA7B

JYA3

JA41

SPM

JA7A

Spindle

motor

Position

coder

JA7B

JYA3

SPM

Spindle

JA7A

motor

<Analog interface spindle amplifier>

CNC

JA41

Position

coder

Analog spindle

Spindle

JA40

amplifier

motor

(d) A cutting feed block containing a feedrate command (F command)

with a feedrate of 0 is specified.

If FCO (bit 7 of parameter No. 1404) is set to 1, P/S alarm 11 is not

issued even if a feedrate command (F command) with a feedrate of

0 is issued.

747

11. TROUBLESHOOTING

B-63525EN/02

11.6

CYCLE START LED

SIGNAL HAS

TURNED OFF

Points

(1) After cycle operation is started, then stopped, check as follows:

(2) Confirm cycle start LED on machine operator’s panel.

(3) Confirm CNC’s diagnostic function.

Causes and Remedies

The reason why cycle start LED signal (STL) has turned off are displayed

on CNC’s diagnostic numbers 020 to 025 as follows:

020 CUT SPEED UP/DOWN

1

0

0

0

1

0

0

021 RESET BUTTON ON

0

0

1

0

0

0

0

022 RESET AND REWIND ON

0

0

0

1

0

0

0

023 EMERGENCY STOP ON

1

0

0

0

0

0

0

024 RESET ON

1

1

1

1

0

0

0

025 STOP MOTION OR DWELL

1

1

1

1

1

1

0

a. Emergency stop signal

b. External reset signal

c. Reset button on MDI

d. Reset & rewind signal

e. Servo alarm

f.

Feed hold by switching mode

g. Single block stop

Details of signals a to g are as follows:

Confirm the signals concerned using diagnostic function (PMCDGN).

a. Emergency stop is input

#7

#6

#5

#4

#3

#2

#1

#0

X1008

*ESP

#7

#6

#5

#4

#3

#2

#1

#0

G0008

*ESP

*ESP=0

: Emergency stop signal is input :

748

B-63525EN/02

11.TROUBLESHOOTING

b. External reset signal is

input

#7

#6

#5

#4

#3

#2

#1

#0

G0008

ERS

#7(ERS) :

When the bit is 1, external reset signal is input.

This signal is usually used for a confirmation signal of M02 when an M02

is specified in a program as the end of a program.

Therefore, when M02 is executed, this signal is input.

c. Reset button on the MDI

An automatic operation is put into a reset status when RESET key on the

is pressed

MDI panel is pressed.

d. Reset & rewind signal is

input

#7

#6

#5

#4

#3

#2

#1

#0

G0008

RRW

#6(RRW) :

When this signal is 1, the reset & rewind signal is input.

This signal is usually used for a confirmation signal of M30 when an M30

is specified in a program as the end of a program.

Therefore, when M30 is executed, this signal is input.

e. Servo alarm has

When any servo alarm has generated, cycle operation is put into the reset

generated

state and operation stop.

f.

Cycle operation is in a

The cycle operation becomes feed hold state in the following cases:

feed hold state

1) Modes are switched from an automatic operation mode to a manual

operation mode.

2) Feed hold signal is input.

<Mode select signal>

#7

#6

#5

#4

#3

#2

#1

#0

G0043

MD4

MD2

MD1

memory edit(EDIT)

0

1

1

Automatic

Automatic operation

0

0

1

operation

(AUTO)

Manual data input (MDI)

0

0

0

Jog feed (JOG)

1

0

0

Manual

Handle/step

1

0

1

operation

TEACH IN HANDLE

1

1

1

TEACH IN JOG

1

1

0

<Feed hold signal>

#7

#6

#5

#4

#3

#2

#1

#0

G0008

*SP

#5(*SP) : When this signal is 0, the feed hold signal is input.

g. It become single block

stop during automatic

operation

#7

#6

#5

#4

#3

#2

#1

#0

G0046

SBK

#1(SBK) When this signal is 1, the single block signal is input.

749

11. TROUBLESHOOTING

B-63525EN/02

11.7

NOTHING IS

DISPLAYED ON THE

LCD WHEN THE

POWER IS TURNED

ON

Causes and actions

If nothing is displayed on the LCD at power-up or if the LCD is locked

with “GRAPHIC IS READY.” or the slot status screen displayed, the

probable causes include the following:

D For the LCD-mounted

D The LCD cable or backlight cable is not connected.

type

D The necessary software is not installed.

D The motherboard, display control card, CPU card, or inverter board is

defective.

D For the stand-alone type

D The LCD unit is not connected to the power supply.

D The LCD cable or backlight cable is not connected.

D The LCD unit is not connected to the CNC with the optical cable or

the cable is broken.

D The necessary software is not installed.

D The main CPU board, display control card, or LCD unit is defective.

If “GRAPHIC IS READY.BOOT START”. is displayed, this indicates

that the display control circuit has started up normally but that the CNC

has not started up.

[For the LCD-mounted

type]

Inverter printed circuit

board

Connector for connecting

the backlight cable

Connector for connecting

the LCD cable

Motherboard (without a PC)

750

B-63525EN/02

11.TROUBLESHOOTING

D LCD display

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

motherboard.

If the motherboard has started up normally and the LCD display indicates

normal operation, a probable cause is a fault of the display system, such

as a cable not connected or a defective inverter board.

If the LCD 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 Connection of the LCD

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

and backlight cables

corresponding connectors.

These cables are connected before shipment from FANUC. This check

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

maintenance.

D The necessary software

If necessary software is not stored in the FROM module, the CNC may

is not installed

not start up.

D Defective printed circuit

If the motherboard or display control card is defective or is not correctly

board

installed, the CNC may not start up.

Check that the card PCBs are engaged firmly with the connectors on the

motherboard.

If any of the above actions does not solve the problem, replace the display

control card, CPU card, and motherboard.

D Installation positions of

the display control card,

and CPU card

Display control

CPU card

card

Motherboard

751

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