FANUC Series 16 / 160 / 18 / 180 – Model B. Maintenance Manual

B-62445E/03

8.TROUBLESHOOTING

A16B-3200-0160

(1)

(2)

(3)

(4) (5) (6) (7)

(8)

(9)

(10)

(11)

(ii)

When parameter no. 0020 is 3 (JD5C,JD6A of option 1 board)

Because communication control module (5) may be faulty,

replace the module.

(Option 1 board)

(7)

(5)

(6)

(1)

(2)

(3)

(4)

(5) Change communication control module

Specification : A20B-2900-0361

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8.TROUBLESHOOTING

< Cable connection>

R232-1 (JD5A)

Punch panel

R232-2 (JD5B)

(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-25Ss

Connector : Half-pitch 20-pins

R232-3 (JD5C)

Host computer

(01)

(02) SD

(02)

(039

(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

333

8. TROUBLESHOOTING

B-62445E/03

Notes

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.

R422-1(JD6A)

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) TR

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

Note

Always use a twisted pair cable.

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8.TROUBLESHOOTING

8.10

REFERENCE

(START)

POSITION DEVIATES

YES

By 1 grid ?

Length of de-

celeration dog

sufficient ?

YES

Exchange dog.

As a temporary work,

lower rapid traverse

rate in reference posi-

tion return

Does deceleration sig-

nal *DECα change

between grids ?

YES

Wrong mounting position

Limit switch for *DEC

a is faulty (variation is

large).

As a temporary work,

lower FL rate in refer-

ence position return.

Does machine return

to original position by

power OFF ?

Confirm connection

YES

between servo mo-

tor and machine

OFF

Is 5V of pulse

coder correct ?

YES

· Pulse coder is

faulty

*Voltage drop be-

· Servo control

Confirm cable

module or servo

tween +5V and 0V

interface module

should be less than

is faulty.

0.2V

335

8. TROUBLESHOOTING

B-62445E/03

8.11

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 : 300

(DGN 300) before or during reference position return.

YES

128 or

(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 mm.

Check rapid traverse override signals :

Override

ROV1

ROV2

ROV1

DGN

014.0

1014.0 (For TT series)

100%

ROV2

DGN

014.1

50%

1014.1 (For TT series)

25%

PRM

1421

Fo rate

Check reference position return deceleration signal

DEC1 DEC8 DGN 009.0 ∼ 009.7

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

becomes FL rate.

PRM 1425 FL rate

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B-62445E/03

8.TROUBLESHOOTING

(1)

Check whether the motor ratated more than one rotation

(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

· Caused by wire resistance

Change pulse coder or motor

check wire material

· Main CPU board is faulty

(resistance shall be 0.5W or

Change main CPU board

less in both ways to restrict

· Option 2 board is faulty

voltage drop.)

Change option 2 board

· Pulse coder power supply is

abnormal

Change the power supply .

Notes

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.

When the main board is exchanged, all the data stored in

memory is lost. Reset all the NC data again, referring to the

data input/output item.

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.

337

8. TROUBLESHOOTING

B-62445E/03

Absolute position data in the serial pulse coder was lost.

8.12

(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

System configuration

Main CPU board

or option 2 board

PWM signal

Servo

Power cable

AMPx

amp.

ENCx

Feedback signal

APCBAT

Battery unit 6V

Servo motor

PC : pulse coder

338

B-62445E/03

8.TROUBLESHOOTING

Absolute pulse coder, cable or servo module is faulty.

8.13

ALARM 301 TO 305

(ABSOLUTE PULSE

CODER IS FAULTY)

Countermeasures

Agitate the absolute pulse coder cable connected to the main CPU

board. If an alarm is issued, replace the cable.

Series 16 main CPU board (MAIN-A): JF1 to JF4

Series 16 main CPU board (MAIN-B): JS1A to JS6A

Series 18 main CPU board: JS1A to JS6A

Agitate the absolute pulse coder cable connected to the option 2 board.

If an alarm is issued, replace the cable.

Series 16 option 2 board (MAIN-A specification): JF5 to JF8

Series 16 option 2 board (MAIN-B specification): JS1A-2 to JS6A-2

Series 18 option 2 board: JS1A-2 to JS6A-2

Replace the servo module.

Replace the module corresponding to the axis indicated by the alarm,

as shown in the figure below.Servo module specification:

A20B-2902-0060 or A20B-2902-0061

<Location of servo module> Main CPU board

A16B-3200-0010

A16B-3200-0170

(1)

(2)

(3)

(4)

(5)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(7) Servo module of 1st, 2nd axis

(9) Servo module of 1st, 2nd axis

(6) Servo module of 3rd, 4th axis

(7) Servo module of 3rd, 4th axis

339

8. TROUBLESHOOTING

B-62445E/03

A16B-3200-0110

A16B-2202-0860

(1)

(1)(2)

(3)

(4)

(5)(6)

(7)

(2)

(3)

(4)

(5)

(6)

(8)(9)

(7)

(8)

(10)

(9)

(11)

(10)

(7) Servo module of 1st, 2nd axis

(8) Servo module of 1st, 2nd axis

(9) Servo module of 3rd, 4th axis

(7) Servo module of 3rd, 4th axis

(8) Servo module of 5th, 6th axis

A16B-3200-0160

(1)

(2)

(3)

(4) (5) (6)

(7)

(8)

(9)

(10)

(11)

(7) Servo module of 1st, 2nd axis

(9) Servo module of 3rd, 4th axis

(8) Servo module of 5th, 6th axis

340

B-62445E/03

8.TROUBLESHOOTING

<Location of servo module> Option 2 board

A16B-2202-0400, 0401

A16B-2202-0890, 0891

(1)

(2)

(3)

(4)

(5)

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(6)

(7)

(7) Servo module of 5th, 6th axis

(6) Servo module of 7th, 8th axis

A16B-2202-0850, 0851, 0853

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(6) Servo module of 5th, 6th axis

(7) Servo module of 3rd, 4th axis

(8) Servo module of 1st, 2nd axis

341

8. TROUBLESHOOTING

B-62445E/03

This alarm is generated when absolute pulse coder battery becomes low.

8.14

ALARM 306 TO 308

(ABSOLUTE PULSE

CODER BATTERY IS

LOW)

Remedies

Exchange the battery connected to the connector JA4A on the main CPU

board or the connector JA4B on the option 2 board.

Note

Change the batteries while power of NC is supplied.

Do not change the battery (memory backup battery) for the

control unit.

Replacing batteries for

Have 4 commercially available dry cell batteries ready.

separate absolute pulse

Turn on power of the machine.

coder

If the batteries are replaced with the power on, absolute position of the

machine is lost.

Loosen the screws of battery case lid and remove the lid.

Consult with the MTB’s manual for where the battery case is installed.

Replace the batteries in the case.

Take care to place the batteries facing in the correct direction. (Insert

the batteries as shown in the diagram with 2 facing one way and 2 the

other.)

Thread

Lid

Replacing Dry Cell Batteries

Having exchanged the batteries put the lid back on.

Turn off the power of the machine.

342

B-62445E/03

8.TROUBLESHOOTING

An error is generated in the control section of the serial pulse

8.15

coder.

ALARM 350 (SERIAL

PULSE CODER IS

ABNORMAL)

Points

Alarm No. 351 has also generated⇒Refer to alarm 351.

Only alarm No. 350 has generated⇒Refer to the following Confirm

the details by diagnostic number 0202 and 0204.

D When diagnostic number

0202 shows 1

0202

CSA

PHA

RCA

CKA

SPH

DGN

#6(CSA)

Check sum alarm has generated.

#4(PHA)

Phase data abnormal alarm has generated.

#3(RCA)

Speed count abnormal alarm has generated.

#1(CKA)

Clock alarm has generated.

#0(SPH)

Soft phase data abnormal alarm has generated.

Check the contens using the above diagnostic function if the alarm

generates repeatedly. If diagnostic data is the same, serial pulse coder

may be faulty.⇒Refer to Notes

When diagnostic result does not the same, or other abnormality is

detected, an external noise may be generated.

D When diagnostic number

0204 shows 1

0204

LDA

PMS

DGN

#4(LDA)

LED of serial pulse coder is abnormal

#3(PMS)

Pulses are not issued correctly by abnormality of serial pulse coder C or

feedback cable.

(1) #4(LDA): LED in the serial pulse coder is abnormal.

Serial pulse coder is faulty⇒Refer to Notes

(2) #3(PMS): Pulses are not issued correctly by abnormality of

feedback cable.

Fault of serial pulse coder ⇒Refer to Notes

Feedback cable is faulty.

Note

Reference position and machine’s standard position are

different from the ones before, adjust and set them correctly.

343

8. TROUBLESHOOTING

B-62445E/03

An error is generated in communication with serial pulse coder.

8.16

ALARM 351 (SERIAL

PULSE CODER

COMMUNICATION

IS ABNORMAL)

Points

Check the details by the diagnostic function of the CNC.

0202

CSA

PHA

RCA

CKA

SPH

DGN

#7(DTE)

Data error has generated.

#6(CRC)

Serial communication error has generated.

#5(STB)

Stop bit error has generated.

1) #7(DTE):Response from serial pulse coder is absent.

Causes

Signal cable is disconnected

Serial pulse coder is faulty. å See note 1.

+5V to the serial pulse coder is lowered.

2) #6(CRC),#5(STB):Serial communication is in faulty

1 Signal cable is disconnected.

2 Serial pulse coder is faulty å See Note 1.

3 Main CPU board or Option 2 board is faulty å See Note 2

Notes

After the serial pulse coder is changed, reference position

or machine’s standard point is different from the one before

replacement. Therefore reset and adjust it again.

All the data stored in memory is lost when the main board

is changed. Set NC data again, referring to “chapter 3 data

input/output”.

344

B-62445E/03

8.TROUBLESHOOTING

Amplifier or overheat of motor is detected.

8.17

ALARM 400

(OVERLOAD)

400 SERVO ALM :X OVERLOAD

⇐ Example of CRT display.

Axis name is also displayed.

Points

Confirm the detail by the diagnostic function of CNC.

0200

OVL

DGN

#7(OVL): 1 OVERLOAD ALARM is displayed.

Check details of alarms by DGN 201.

0201

ALD

DGN

↓

Overheat of servo motor

Overheat of servo amplifier

Overheat of servo motor

(START)

Is it hot ?

YES

Overheat of motor

Defective thermostat

NOTE : After the motor is changed, reference

(Next page) (1)

position or machine’s reference point is

different from the one before replace

ment. Set it again.

345

8. TROUBLESHOOTING

B-62445E/03

D Overheat of servo

LED 6 of servo amplifier is lit

amplifier

(START)

Check LED status

of servo amplifier

[6] ?

YES

NO(Not light)

[-] ?

YES

Check input power volt-

age of servo amplifier

Is amplifier hot

YES

Normal ?

(1)

YES

Measure current at ter-

Servo amplifier is

minal IR and IS while

faulty

moving the machine.

*Refer to item of C series

servo amp.

Check magnetic circuit

Does current ex-

ceed a rated one

· Check temperature around

YES

· Lower cutting conditions

Machine load is large

Insulation of motor is poor

346

B-62445E/03

8.TROUBLESHOOTING

Ready signal (*DRDY) of servo amplifier is not turned on or turned off

8.18

during operation.

ALARM 401 (*DRDY

SIGNAL TURNED

(START)

OFF)

*When alarm 414 is also generated, LED

shows a number. Consult with alarm 414.

Check LED status

of servo amplifier

NO(Not lit)

[-] ?

YES

Check input power sup-

ply of servo amplifier

Check if 100VAC is

supplied across 5 and 6

on terminal board T1 of

YES

Servo amp. is

Normal ?

the servo unit

faulty

100VAC is

normal ?

YES

Check magnetics

circuit

· Cable disconnection between servo amp. and

main CPU or option 2 board.

· Servo amp. is faulty

· Main CPU board or option 2 board is faulty

Note

When the main CPU board is replaced, all the data stored

in memory is lost. Set NC data again, referring to chapter 3.

“Data input/output” .

Main CPU board

Servo amplifier (C series)

Option 2 board

AMPx

CN1

T1-5, 6

-10

RLY

MCC

*MCOM

100V

-20

*DRDY

From 1st axis to 4th axis are main CPU board. 5th axis or

later are option 2 board.

347

8. TROUBLESHOOTING

B-62445E/03

Power on sequence (NCàServo amplifier)

*Power supply unit failure

Power ON

*Input fuse disconnection

*SVF1~8 (Servo off signal)

Servo enable

Position, velocity

*System alarm (ALM900∼973) *Servo alarm

control ready (*MCON)

(ALM400∼417) *Emergency stop (*ESP)

Servo amp. ready (DRDY)

* Servo amp. alarm (1-9,b) *Emergency

stop signall (*ESP) *100VAC Lack of

3-phase input voltage

348

B-62445E/03

8.TROUBLESHOOTING

8.19

ALARM 404 AND 405

(*DRDY SIGNAL

TURNED ON)

D Alarm 404

DRDY signal is turned on before MCON signal is turned on. Or DRDY

is not turned off after MCON signal is turned off.

D Causes

Servo amplifier is faulty.

Between servo amplifier and main CPU or between servo amplifier

and option 2 board is faulty.

Main CPU or option 2 board is faulty.

Note

When the main CPU board is replaced, all the data stored

in memory is lost. Set the NC data again, referring to chapter

3 “data input/output”.

· Main CPU board

Servo amplifier (C series)

· Option 2 board

AMPx

CN1

T1-5, 6

-10

RLY

MCC

100

MCOM

VAC

-20

*DRDY

From 1st axis to 4th axis are main CPU board. 5th axis or later are option

2 board.

D Alarm 405 (Reference

The grid signal is not turned on when the automatic reference position

positin return is

return by G28 is completed.

abnormal)

D Causes

Main CPU board or Option 2 board is faulty.

Note

When the main CPU board is replaced, all the data stored

in memory is lost. Set the NC data again, referring to

chapter 3 “data input/output”.

349

8. TROUBLESHOOTING

B-62445E/03

Position error amount at stop (DGN 300) exceeds a value set by parameter

8.20

No. 1829.

ALARM 410

(START)

(EXCESSIVE

POSITION ERROR

YES

Is it vertical

AMOUNT DURING

axis?

STOP)

Check parameters 1825 and 1829 if they are cor-

Check servo off signal of

rect (see parameter list attached)

each axis. The servo off

function is valid when DGN

G126 bits 0-7 is 1.

Servo off funciton is used to

escape overload of an axis

when the axis is mechani-

cally clamped.

Correct

YES

Set correct

Note)

parameters.

Perform initial setting

of servo parameters

YES

'1'?

Check PMC

Recovered ?

YES

Turn off NC power

Be carefull vertical

and remove power

axis does not drop.

line of motor then

Set digital servo pa-

rameters according

turn on power

to parameter list

Measure motor power

Note) Save current CNC pa-

at terminal board T1

Measure in DC range

9-10-11 of the servo

rameters in a floppy disk or

such before performing ini-

amplifier

tial setting for safety.

( No power ) ON

Power sup-

plied?

YES

· Servo amp. is faulty.

· Signal line disconnection between servo amp.

and main CPU or between servo amp. and

Motor power line

option 2 board.

is broken

· Main CPU board or option 2 board is

faulty.

Note

When the main board is replaced, all the data stored in

memory is lost. Set NC data again, referring to chapter 3

“data input/output” .

350

B-62445E/03

8.TROUBLESHOOTING

Position error amount during movement (DGN 300) execeeds a value set

8.21

by parameter 1828.

ALRAM 411

(START)

(EXECESSIVE

POSITION ERROR

With a move command,

DURING MOVE)

does this alarm occur af-

ter machine moves ?

YES (Move)

Moves and

(1)

alarmed?

NO (No move)

Turn off NC power,

remove power line

Be careful that vertical axis

and turn on power

does not drop by its weight.

Check motor power

at terminal board T1

9-10-11 of servo

Measure by DC voltage

amplifier

NO (Not output)

Power out-

put ?

YES

Confirm each-axis

servo off signal

G126.0∼7=1

Mechanical load is

excessive

Disconnection of

power line

YES

’1’ ?

Check PMC su-

Signal line between main

quence, release ser-

CPU board or option 2

vo off and check op-

board and servo amplifier is

eration again

disconnected

From 1st axis to 4th

YES

axis are main CPU

Normal ?

board.

5th axis or later are

option 2 board.

Servo amplifier is

Cable is faulty

faulty

351

8. TROUBLESHOOTING

B-62445E/03

(1)

Move the machine

at constant low

speed and check

DGN 300.

YES

Value fluctuate ?

Measure current at

IR and IS while mov-

Compare the value

Note 1)

ing the machine

obtained by the fol-

lowing formula and

DGN 300

* Refer to C series servo

amplifier for current val-

ues

Correct ?

YES

Servo amplifier is

Mechanical load is

faulty.

large. Refer to

Main CPU board or op-

alarm 400.

tion 2 board is faulty.

Compare value of

PRM1828 and the

list Note2)

From 1st axis to 4th axis are main CPU board.

5th axis or later are option 2 board.

Note) When the main CPU board is

replaced, all the data in

memory is lost. Reset NC

Correct ?

data, referring to chapter 3

data input/output item.

YES

Servo amplifier is

faulty

Correct parameters

Notes

Feed rate (mmńmin)

Position error=

60 PRM1825

Detection unit

Parameter 1828yPosition error at rapid traverse

1.2

352

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8.TROUBLESHOOTING

8.22

ALARM 414 (DIGITAL

SERVO SYSTEM IS

EXAMPLE OF DISPLAY

414 SERVO ALARM:X-AXIS

ABNORMAL)

AXIS NAME DETECTED

DETECTION

IS DISPLAYED

SYSTEM ERROR

Points

Check details by CNC’s diagnostic fucntion and LED display on the servo

amplifier.

DGN

0200

OVC

HCA

HVA

DCA

FBA

OFA

LED display on the servo amplifier

STATUS

* An alarm detected on the servo amplifier is

also displayed at DGN 200.

DGN

0204

OFS

MCC

D When DGN200 shows

”1”

DGN

0200

OVC

HCA

HVA

DCA

FBA

OFA

#6(LV): Low voltage alarm

→ LED [2] or [3] lights

#5(OVC): Over current alarm

#4(HCA): Abnormal current alarm

³ LED [8] lights

#3(HVA): Over current alarm

³ LED [1] lights

#2(DCA): Discharge alarm

³ LED [4] or [5] lights

#1(FBA): Disconnection alarm

#0(OFA): Overflow alarm

353

8. TROUBLESHOOTING

B-62445E/03

D #6(LV):Insufficient

voltage alarm

Servo amp LED [2] turns on (control power shortage)

(START)

Check +5V power

at check terminal of

servo unit

YES

Voltage is

normal ?

Servo amplifier is

faulty

Check input power

* Power should be 200/220/230VAC -15%

to the controller

across terminal T1(13) and (14)

Is voltage

normal ?

YES

Input voltage is

abnormal

Servo amplifier is

faulty

Servo amp LED [3] turns on (DC power shortage)

(START)

YES

Breaker off ?

Turn off breaker and

check again

Check input volt-

* Power should be 200/220/230VAC,-15%

age of servo amp.

among terminal board T1(2)-(3)-(4).

Is voltage

normal ?

YES

Input voltage

is abnormal

Servo amplifier

is faulty

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8.TROUBLESHOOTING

D #5(OVC):Over current

detection by software

(START)

Check current at check termi-

nal IR and IS at servo amplifi-

er and compare with rated

current of motor

Larger than

1.7 times for motor 20S or

1.4 times ?

larger.

YES

Move axis at low speed

and measure current at

IR and IS, and compare

with rated current

Within rated

YES

current ?

Check servo parameters

2040,2041,2056,2057 with

parameter list.

Machine load is

large. Check load

at machine side.

Correct ?

YES

Correct parameters.

· Servo amplifier is

faulty

· Main CPU or option

2 board is faulty.

From 1st axis to 4th axis are main CPU board.

5th axis or later are option 2 board.

NOTE : When the main CUP board is

replaced, all the data in memory is

lost.Reset NC data, referring to

chapter 3 ”data input/output” .

355

8. TROUBLESHOOTING

B-62445E/03

D #4(HCA):Abnormal

current alarm

(START)

(Servo amp. LED:[8]

lights)

Give a move command

and check wether the

alarm is generated

Alarmed ?

YES

Remove motor power

* Take care that verti-

line and turn on power

cal axis may drop.

YES

Alarmed ?

Servo amp. is faulty.

· Short circuit between

power lines

· Grounding of power lines

· Poor insulation of motor

356

B-62445E/03

8.TROUBLESHOOTING

D #3(HVA):Over voltage

DC voltage in servo amp. is excessive.

alarm (Servo amp.LED

(Start)

[1] lights)

Confirm status when

an alarm is generated

Does the alarm

generate during

deceleration ?

Power should be within

Confirm input voltage

200/220/230VAC among

YES

of servo amplifier

3 phases of terminal

T1(2),(3) and (4)

Is voltage

normal ?

YES

Input power voltage

is abnormal

Check feed rate

Servo amp. is faulty

Does the alarm

YES

generate dur-

ing rapid tra-

verse ?

· Is acc/dec time is correct ?

· Isn’t load inertial too large ?

· Is friction reduced by aging of

machine ?

Servo amp. is faulty

Set acc./dcc. time

Refer to acc./dec. param-

constant lager as a

eters 1600 and so on.

temporary measure

357

8. TROUBLESHOOTING

B-62445E/03

D #2(DCA):Discharge alarm

Servo amp LED 4 lights (discharge control circuit is abnormal)

(START)

Generate at

YES

power on ?

Servo amp. is faulty

YES

Generate during

deceleration ?

NO.

Check frequency of

acceleration/deceleration

Generate dur-

ing lowering of

Frequent ?

vertical axis

YES

Servo amp. is faulty

· Mechanical load inertia

Balancer adjustment failure

is large

· Resistance for friction

due to againg of machine

is reduced.

Check by motor load current

during up/down movement

Set a larger acc./dec. time constant

as a temporary measure.

*Take care that deceleration dis-

tance becomes longer.

Separate type dis-

charge resistor must

be added

358

B-62445E/03

8.TROUBLESHOOTING

Servo amp LED 5 lights (discharge circuit overheat)

Separate type

(START)

Servo amp.

discharge unit

(C series)

TH -3

-15

YES

-4

-16

Generate at

power on?

ALM

YES

Is unit hot ?

Short betrween 15 and 16

when not used.

Check resistance

across terminals

T1(15) and (16).

0Ω ?

Measure load current

YES

Check whether sep-

arated discharge unit

Servo amp. is faulty.

is connected(Across

15 and 16 of T1)

Is larger than

rated current ?

YES

· Check ambient temperature rise

· Lower cutting condition

(Wired across 15 and 16 or T1)

Wired ?

· Machine side load is large

YES

· Insulation of motor is poor

Measure reistance

across 3 and 4 at

terminal board of

separate type dis-

charge unit.

Short-circuit across 15 and

16 of terminal board T1

YES

0Ω ?

Disconnection of

cable between sep-

Separate type discharge

arate type dischrge

unit is faulty

unit and servo amp.

359

8. TROUBLESHOOTING

B-62445E/03

D #1(FBA):DISCONNECTIO

Position detection signal line is disconnected or short-circuited.

N ALARM

DGN

0201

ALD

EXP

→

Built-in serial pulse coder

³ENC_X

disconnection

Separate type position

³SCALE_X

detector connection

Pulse coder disconnec-

Note

tion (software)

Note

This alarm is related with full-closed system.

D Causes

Signal cable is disconnected or short-circuited

Serial pulse coder or position detector is faulty Refer to Notes 1

Main CPU board or option 2 board is faulty.

Refer to Notes 2

Notes

After the pulse coder is replaced, reference position or

machine’s standard position is different from former one.

Adjust and set it correctly.

When the main CPU board is replaced, all the data stored

in memory is lost. Set NC data again, referring to chapter 3

“data input/output”.

Linear scale

Main CPU board

or Option 2 board

ENCx

SCALEx

x is an axis number

From 1st axis to 4th axis are main CPU board. 5th axis or later are

option 2 board.

7)#0(OFA):Overflow alarm

360

B-62445E/03

8.TROUBLESHOOTING

causes

Wrong setting of servo parameters 1800s.

Main CPU (1axis to 4 axes) or option 2 board (5 axes or more)

Note

When the main CPU board is replaced, all the data stored

in memory is lost. Set NC data again, referring to chapter

3 “data input/output ” .

When 1 is displayed at

DGN 204

DGN

0204

OFS

MCC

#6(OFS):

A/D converter used for current feedback in the digital servo is abnormal.

#5(MCC):

Contacts of electromagnetic contactor in the servo amp. is blown.→LED

7 lights.

Serial pulse coder C is an incremental pulse coder.

D #6(OFS):A/D converter is

Main CPU board or option 2 board is faulty

abnormal

When the main CPU board is replaced, all the data stored in memory is

lost.

Set NC data again, referring to chapter 3 ” data input/output ”.

D #5(MCC):Contacts of

electro-magnetic

(START)

contactor is blown within

servo amp.

Check LED of

servo amplifier

LED [7] Contacts of electro-magnetic

contactor is blown in servo

amplifier

NO (Not lit)

[7] ?

YES

Check input power

voltage of servo amp.

AC200/220/2

YES

Correct?

30V

+10%,-15%

Servo amplifier is faulty

Check magnetics circuit

361

FANUC Series 16 / 160 / 18 / 180 – Model B. Maintenance Manual - page 12