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

3.TROUBLESHOOTING AND

ACTION

TROUBLESHOOTING

B-65285EN/04

(1) When this alarm is issued immediately after the motor excitation (SFR, SRV) is turned off, then on

again in spindle synchronization

This alarm may be issued because the spindle motor is accelerated to eliminate the accumulated

position error while the motor excitation is off. Modify the sequence so that the motor excitation is

turned off after spindle synchronization is released.

(2) When this alarm is issued during cutting

(a) A possible cause is overload. Review the cutting conditions.

(b) When no overload occurs, review whether the alarm detection level setting is appropriate.

3.4.73 Alarm Code C9

In spindle synchronization, the position error exceeded the alarm detection level (parameter No. 4516).

For troubleshooting when this alarm is issued, see the subsection about alarm code C8.

3.4.74 Alarm Code d0

In tandem control, the speed polarity relationship between the master motor and slave motor is abnormal.

Troubleshooting when this alarm is issued

Check the setting related to the rotation direction (FS16: bit 2 of parameter No. 4353).

3.4.75 Alarm Code d1

An error occurred during spindle adjustment function operation.

Troubleshooting when this alarm is issued

Refer to the description of the error and action to be taken that are displayed on the SERVO GUIDE.

3.4.76 Alarm Code d2

Communication between the sensor (serial) and Spindle Amplifier is disconnected.

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

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

Troubleshooting when this alarm is issued

(a) There is a parameter setting error.

Refer to the section, "START-UP," in the FANUC AC SPINDLE MOTOR αi series Parameter

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

(b) The Spindle Amplifier is not supported.

Check the items related to the section, "PARAMETERS RELATED TO DETECTORS," in the

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

Replace the cable or check the connection.

(d) The Spindle Amplifier is defective.

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

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3.TROUBLESHOOTING AND

B-65285EN/04

TROUBLESHOOTING

ACTION

3.4.77 Alarm Code d3

Serial data between the sensor (serial) and Spindle Amplifier that was received by the Spindle Amplifier

was detected being destroyed by noise.

Troubleshooting when this alarm is issued

(a) Check the shielding of the cable between the sensor (serial) and Spindle Amplifier.

Check the items related to the section, "Detectors," in the FANUC SERVO AMPLIFIER αi series

Descriptions (B-65282EN).

3.4.78 Alarm Code d4

A change to position data from the sensor (serial) was detected exceeding the expected range.

When this alarm is issued at the start, possible causes are both (a) and (b) below. When the machine has

been operating normally, the possible cause is (b).

Troubleshooting when this alarm is issued

(a) There is a parameter setting error.

Refer to the section, "Parameters Related to Start-up," in the FANUC AC SPINDLE MOTOR αi

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

(b) Check the shielding of the cable between the sensor (serial) and Spindle Amplifier.

Check the items related to the section, "Detectors," in the FANUC SERVO AMPLIFIER αi series

Descriptions (B-65282EN).

3.4.79 Alarm Code d7

A communication error occurred in an electronic device on the Spindle Amplifier control circuit.

Troubleshooting when this alarm is issued

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

abnormal.

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

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

3.4.80 Alarm Code d9

An error occurred in the inner circuit of the sensor (serial).

Troubleshooting when this alarm is issued

(a) The detection circuit is abnormal.

Replace the detection circuit.

3.4.81 Alarm Code E0

The number of pulses between one-rotation signals of the sensor (serial) is outside the specified range.

Troubleshooting when this alarm is issued

(a) The detection circuit is abnormal.

Replace the detection circuit.

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3.TROUBLESHOOTING AND

ACTION

TROUBLESHOOTING

B-65285EN/04

3.4.82 Alarm Code E1

The one-rotation signal of the sensor (serial) was not generated within five rotations after power-on.

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

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

Troubleshooting when this alarm is issued

(a) There is a parameter setting error.

When an invalid number of teeth of the sensor is set, this alarm may be issued because the actual

number of rotations does not match the number of rotations calculated by the Spindle Amplifier. Refer

to the section, "Parameters Related to Start-up," in the FANUC AC SPINDLE MOTOR αi series

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

(b) Sensor adjustment is defective.

Refer to the section, "Detectors," in the FANUC SERVO AMPLIFIER αi series Descriptions

(B-65282EN) to adjust the sensor signal.

Replace the detection circuit.

3.4.83 Other Alarms

(1) If the Spindle Amplifier status display is 4, 11, 30, 33, 51, 57, 58, b1, b2, or b3

This status display means that an alarm condition occurred in the Power Supply. Check the status

display of the Power Supply, and see Section 2.3.

(2) About CNC alarms 756 and 766 (abnormal axis number)

These alarms can be issued only when the Dual Check Safety function is in use. If this alarm is issued,

check that K76 shown below is attached to the JA7A connector of the second spindle. K76 is

unnecessary if only the first spindle is used. If the wiring is normal, replace the Spindle Amplifier

control printed-circuit board.

Details of K76

CNC

(First spindle)

(Second

K76

spindle)

JA41 JA7B

JA7A

JA7B

JA7A

X2NDSP

(15)

(13)

K76

20-pin half-pitch

connector

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3.TROUBLESHOOTING AND

B-65285EN/04

TROUBLESHOOTING

ACTION

3.5

αCi SERIES SPINDLE AMPLIFIER MODULE

This section explains those alarm codes for the αCi series which require troubleshooting sequences that are

different from those for the αi series even when the alarm numbers are the same.

For explanations about the alarm codes not stated herein, see the descriptions about the corresponding

number given in Section 2.4, "Spindle Amplifier."

3.5.1

Alarm Code 12

An excessive motor current was detected.

An excessively large current flowed into the DC link of the main circuit.

For SPMC-2.2i to -15i

An overload, overcurrent, or a low control power supply voltage was detected in the power module (IPM)

of the main circuit.

(1)

If this alarm is issued on SPMC-2.2i to -15i

Check alarm code 09 as well.

(2)

If this alarm is issued immediately after a spindle rotation command is specified

(a) The motor power lead is faulty.

Check for a short circuit between motor power leads and short-circuit to ground, and replace the

power lead as required.

(b) The insulation of the motor winding is defective.

If the motor is short-circuited to ground, replace the motor.

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

(d) The SPMC is faulty.

A power element (IGBT, IPM) may be destroyed. Replace the SPMC.

(3)

If this alarm is issued during spindle rotation

(a) Belt slippage

It is likely that there may be belt slippage between the spindle and motor. Clean the pulleys and

adjust the belt tension.

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

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

the parameters specific to the motor.

A power element (IGBT, IPM) may be destroyed. Replace the SPMC.

If the amplifier setting condition is not satisfied, or cooling is insufficient because the heat sink is

dirty, the power elements may be destroyed.

When the heat sink on the back of the amplifier is too dirty, clean the heat sink, for example, by

blowing air. Consider the use of a structure that prevents the heat sink from being directly

exposed to coolant.

For the installation condition, refer to "FANUC SERVO AMPLIFIER αi series Descriptions

(B-65282EN)."

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3.TROUBLESHOOTING AND

ACTION

TROUBLESHOOTING

B-65285EN/04

3.5.2

Alarm Code 35

There is a large difference between the motor speed calculated from the position coder and the motor speed

estimated with the spindle software.

(1) If an alarm is issued when a rotation command is entered

(a) Error in the position coder setting parameter

Correctly specify the bits representing the relationships between the direction of position coder

rotation and that of spindle rotation and between the direction of spindle rotation and that of

motor rotation.

FS15i

FS16i

Description

3000#0

4000#0

Spindle and spindle motor rotation directions

3001#4

4001#4

Spindle sensor (position coder) mounting direction

(b) Invalid gear ratio parameter setting

Check to see if an incorrect gear ratio has been specified.

This value is used to convert the position coder speed to the motor speed. Be sure to specify the

correct value.

FS15i

FS16i

Description

3056 to 3059

4056 to 4059

Spindle-motor gear ratio data

Make sure that the entered clutch/gear signals (CTH1A, CTH2A) are correct with respect to the

actually selected gear.

FS15i

FS16i

First spindle

G227 G070

CTH1A

CTH2A

Second spindle

G235 G074

CTH1B

CTH2B

(d) Belt slippage between the spindle and spindle motor

Make adjustments so that no belt slippage will occur between the spindle and spindle motor.

(2) If an alarm is issued during a cutting operation

An overload has occurred to decrease the motor speed.

Review the cutting condition.

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4.REPLACING AMPLIFIER

B-65285EN/04

TROUBLESHOOTING

COMPONENTS

4 REPLACING AMPLIFIER COMPONENTS

This chapter describes how to replace a fan motor, absolute Pulsecoder battery, fuses, and printed-circuit

board.

WARNING

Because the Servo Amplifier uses a large-capacitance electrolytic capacitor

internally, the Servo Amplifier remains charged for a while even after the power is

turned off. Before touching the Servo Amplifier for maintenance or other purposes,

ensure your safety by measuring the residual voltage in the DC link with a tester

and confirming that the charge indication LED (red) is off.

4.1

REPLACEMENT OF A FAN MOTOR

(1) Fan motor for internal cooling

Replace the internal fan motor, according to the procedure shown in the figure below.

When replacing the fan motor, be careful about the direction of the fan motor (air blow direction), the

direction of the connector, etc.

Air blow direction

Fan unit

(2) Remove the fan

(1) Hold the two tabs

and get the fan unit

unit by pulling it

White Black Red

off the latch.

upward.

Fan unit (60-mm-wide)

Tab

Be careful about the

connector key direction.

Fan unit (90-mm-wide)

Red

Black

White

Be careful about the

connector key direction.

Fan unit (150-mm-wide)

* Be careful about the fan motor and connector directions.

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4.REPLACING AMPLIFIER

COMPONENTS

TROUBLESHOOTING

B-65285EN/04

(2) Fan motor for cooling the external radiator

<1> Remove the two sheet metal mounting screws (for the 60-mm-wide model only), and detach the

fan motor from the unit together with the sheet metal.

<2> Remove the fan motor mounting screws (two for one fan motor and four for two fan motors).

<3> Remove the connector mounting screws (two and four for the 300-mm-wide model).

When replacing the fan motor, be careful about the direction of the fan motor (air blow direction), the

direction of the connector, etc.

Sheet metal mounting screws

Fan motor

Connector mounting screw

mounting screw

Air blow

direction

60 mm wide/90 mm wide

150 mm wide

300 mm wide

Specification number of fan unit

- Power Supply

Internal cooling fan

Radiator cooling fan

Model name

Fan unit (*1)

Fan motor

Fan unit (*1)

Fan motor

αiPS 5.5

A90L-0001-0441/39

αiPS 11

αiPS 15

A90L-0001-0441/39

A06B-6110-C603

A90L-0001-0508

αiPS 11HV

αiPS 18HV

αiPS 26

αiPS 30

A90L-0001-0441/39

(A06B-6110-C604)

A90L-0001-0509

αiPS 37

αiPS 30HV

A06B-6110-C607

A90L-0001-0441/39

αiPS 45HV

(A06B-6110-C604)

A90L-0001-0509

A90L-0001-0511(*2)

αiPS 60HV

αiPS 55

A06B-6110-C607

A90L-0001-0441/39

(A06B-6110-C604)

A90L-0001-0509

αiPS 75HV

Two are used.

A90L-0001-0511(*2)

Two are used.

αiPS 100HV

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4.REPLACING AMPLIFIER

B-65285EN/04

TROUBLESHOOTING

COMPONENTS

- Servo Amplifier

(1) 200 V input with one axis

Internal cooling fan

Radiator cooling fan

Model name

Fan unit (*1)

Fan motor

Fan unit (*1)

Fan motor

αiSV 4

A06B-6110-C605

A90L-0001-0510

αiSV 20

A06B-6110-C605

A90L-0001-0510

αiSV 40

A06B-6110-C605

A90L-0001-0510

αiSV 80

A06B-6110-C605

A90L-0001-0510

αiSV 160

A06B-6110-C605

A90L-0001-0510

A06B-6110-C602

A90L-0001-0507/B

αiSV 360

A06B-6110-C607

A90L-0001-0511

(A06B-6110-C604)

A90L-0001-0509

αiSV 20L

A06B-6110-C605

A90L-0001-0510

αiSV 40L

A06B-6110-C605

A90L-0001-0510

αiSV 80L

A06B-6110-C605

A90L-0001-0510

A06B-6110-C602

A90L-0001-0507/B

αiSV 160L

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

(2) 200 V input with two axes

Internal cooling fan

Radiator cooling fan

Model name

Fan unit (*1)

Fan motor

Fan unit (*1)

Fan motor

αiSV 4/4

A06B-6110-C605

A90L-0001-0510

αiSV 4/20

A06B-6110-C605

A90L-0001-0510

αiSV 20/20

A06B-6110-C605

A90L-0001-0510

αiSV 20/40

A06B-6110-C605

A90L-0001-0510

αiSV 40/40

A06B-6110-C605

A90L-0001-0510

A06B-6110-C601

A90L-0001-0507/A

αiSV 40/80

A06B-6110-C605

A90L-0001-0510

A06B-6110-C601

A90L-0001-0507/A

αiSV 80/80

A06B-6110-C605

A90L-0001-0510

A06B-6110-C601

A90L-0001-0507/A

αiSV 80/160

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

αiSV 160/160

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

αiSV 20/20L

A06B-6110-C605

A90L-0001-0510

αiSV 20/40L

A06B-6110-C605

A90L-0001-0510

A06B-6110-C601

A90L-0001-0507/A

αiSV 40/40L

A06B-6110-C605

A90L-0001-0510

A06B-6110-C601

A90L-0001-0507/A

αiSV 40/80L

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

αiSV 80/80L

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

(*1) A fan unit is a set of a fan motor and a cover for mounting it. A fan motor can be replaced separately

from the fan unit. The fan unit A06B-6110-C604, enclosed in parentheses, cannot be dismounted from

the outside. So replace only the fan motor, which can be dismounted from the outside. (See Section

III-1.3, "HOW TO REPLACE THE FAN MOTOR.")

(*2) For A06B-6110-C607

(3) 200 V input with three axes

Internal cooling fan

Radiator cooling fan

Model name

Fan unit (*1)

Fan motor

Fan unit

Fan motor

αiSV 4/4/4

A06B-6110-C605

A90L-0001-0510

αiSV 20/20/20

A06B-6110-C605

A90L-0001-0510

A90L-0001-0385/T(*2)

αiSV 20/20/40

A06B-6110-C605

A90L-0001-0510

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4.REPLACING AMPLIFIER

COMPONENTS

TROUBLESHOOTING

B-65285EN/04

(4) 400 V input with one axis

Internal cooling fan

Radiator cooling fan

Model name

Fan unit (*1)

Fan motor

Fan unit (*1)

Fan motor

αiSV 10HV

A06B-6110-C605

A90L-0001-0510

αiSV 20HV

A06B-6110-C605

A90L-0001-0510

αiSV 40HV

A06B-6110-C605

A90L-0001-0510

αiSV 80HV

A06B-6110-C605

A90L-0001-0510

A06B-6110-C602

A90L-0001-0507/B

αiSV 180HV

A06B-6110-C607

A90L-0001-0511

(A06B-6110-C604)

A90L-0001-0509

A06B-6110-C607

A90L-0001-0511

(A06B-6110-C604)

A90L-0001-0509

αiSV 360HV

Two are used.

A06B-6110-C607

A90L-0001-0511

(A06B-6110-C604)

A90L-0001-0509

αiSV 540HV

Two are used.

αiSV 10HVL

A06B-6110-C605

A90L-0001-0510

αiSV 20HVL

A06B-6110-C605

A90L-0001-0510

αiSV 40HVL

A06B-6110-C605

A90L-0001-0510

A06B-6110-C602

A90L-0001-0507/B

αiSV 80HVL

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

(5) 400 V input with two axes

Internal cooling fan

Radiator cooling fan

Model name

Fan unit (*1)

Fan motor

Fan unit (*1)

Fan motor

αiSV 10/10HV

A06B-6110-C605

A90L-0001-0510

αiSV 20/20HV

A06B-6110-C605

A90L-0001-0510

αiSV 20/40HV

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

αiSV 40/40HV

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

αiSV 40/80HV

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

αiSV 80/80HV

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

αiSV 10/10HVL

A06B-6110-C605

A90L-0001-0510

αiSV 20/20HVL

A06B-6110-C605

A90L-0001-0510

A06B-6110-C601

A90L-0001-0507/A

αiSV 20/40HVL

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

αiSV 40/40HVL

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

(*1) A fan unit is a set of a fan motor and a cover for mounting it. A fan motor can be replaced separately

from the fan unit. The fan unit A06B-6110-C604, enclosed in parentheses, cannot be dismounted from

the outside. So replace only the fan motor, which can be dismounted from the outside.

(*2) The αiSV 20/20/20 has, within its housing, a fan motor for cooling the heat sink fins on the power

transistor.

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4.REPLACING AMPLIFIER

B-65285EN/04

TROUBLESHOOTING

COMPONENTS

- Spindle Amplifier

Internal cooling fan

Radiator cooling fan

Model name

Fan unit (*1)

Fan motor

Fan unit (*1)

Fan motor

αiSP 2.2

A06B-6110-C605

A90L-0001-0510

αiSP 5.5

A06B-6110-C605

A90L-0001-0510

A06B-6110-C601

A90L-0001-0507/A

αiSP 5.5HV

A06B-6110-C605

A90L-0001-0510

A06B-6110-C602

A90L-0001-0507/B

αiSP 11

αiSP 15

A06B-6110-C606

A90L-0001-0510

A06B-6110-C603

A90L-0001-0508

αiSP 11HV

αiSP 15HV

αiSP 22

αiSP 26

αiSP 30

A06B-6110-C607

A90L-0001-0511

(A06B-6110-C604)

A90L-0001-0509

αiSP 37

αiSP 30HV

αiSP 45HV

αiSP 45

αiSP 55

A06B-6110-C607

A90L-0001-0511

(A06B-6110-C604)

A90L-0001-0509

αiSP 75HV

Two are used.

αiSP 100HV

(*1) A fan unit is a set of a fan motor and a cover for mounting it. A fan motor can be replaced separately

from the fan unit. The fan unit A06B-6110-C604, enclosed in parentheses, cannot be dismounted from

the outside. So replace only the fan motor, which can be dismounted from the outside.

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4.REPLACING AMPLIFIER

COMPONENTS

TROUBLESHOOTING

B-65285EN/04

4.2

REPLACING BATTERY FOR ABSOLUTE PULSECODERS

4.2.1

Overview

• When the voltage of the batteries for absolute Pulsecoders becomes low, alarm 307 or 306 occurs, with

the following indication in the CNC state display at the bottom of the CNC screen.

Alarm 307 (alarm indicating the voltage of the battery becomes low) :

The indication "APC" blinks in reversed display.

Alarm 306 (battery zero alarm) :

The indication "ALM" blinks in reversed display.

• When alarm 307 (alarm indicating the voltage of the battery becomes low) occurs, replace the battery

as soon as possible. In general, the battery should be replaced within one or two weeks, however, this

depends on the number of Pulsecoders used.

• When alarm 306 (battery zero alarm) occurs, Pulsecoders are reset to the initial state, in which absolute

positions are not held. Alarm 300 (reference position return request alarm) also occurs, indicating that

reference position return is required.

• In general, replace the batteries periodically within the service life listed below.

A06B-6050-K061 or D-size alkaline dry cells (LR20) : Two years

(for each six-axis

configuration)

A06B-6073-K001 : Two years (for each three-axis configuration)

A06B-6114-K504 : One year (for each three-axis configuration)

NOTE

The above values indicate the estimated service life of batteries used with FANUC

absolute Pulsecoders. The actual battery service life depends on the machine

configuration based on, for example, detector types. For details, contact the

machine tool builder.

4.2.2

Replacing Batteries

To prevent absolute position information in absolute Pulsecoders from being lost, turn on the machine

power before replacing the battery. The replacement procedure is described below.

<1> Ensure that the power to the servo amplifier is turned on.

<2> Ensure that the machine is in the emergency stop state (the motor is inactive).

<3> Ensure that the DC link charge LED of the servo amplifier is off.

<4> Detach the old batteries and attach new ones.

The replacement of the batteries in a separate battery case and the replacement of the battery built into the

servo amplifier are described below in detail.

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4.REPLACING AMPLIFIER

B-65285EN/04

TROUBLESHOOTING

COMPONENTS

WARNING

• The absolute Pulsecoder of each of the αi/αi S series servo motors and the βi S

series servo motors (βi S0.4 to βi S22) has a built-in backup capacitor. Therefore,

even when the power to the servo amplifier is off and the batteries are replaced,

reference position return is not required if the replacement completes within less

than 10 minutes. Turn the power on and replace the batteries if the replacement

will take 10 minutes or more.

• To prevent electric shock, be careful not to touch metal parts in the power

magnetics cabinet when replacing the batteries.

• Because the servo amplifier uses a large-capacitance electrolytic capacitor

internally, the servo amplifier remains charged for a while even after the power is

turned off. Before touching the servo amplifier for maintenance or other purposes,

ensure your safety by measuring the residual voltage in the DC link with a tester

and confirming that the charge indication LED (red) is off.

• Be sure to replace the batteries with specified ones. Pay attention to the battery

polarity. If a wrong type of battery is used or a battery is installed with incorrect

polarity, the battery may overheat, blow out, or catch fire, or the absolute position

information in the absolute Pulsecoders may be lost.

• Ensure that the battery connector is inserted in the correct position.

4.2.3

Replacing the Batteries in a Separate Battery Case

Use the following procedure to replace the batteries in the battery case.

<1> Loosen the screws on the battery case and detach the cover.

<2> Replace the batteries in the case (pay attention to the polarity).

<3> Attach the cover to the battery case.

Battery case (with a cover)

A06B-6050-K060

Batteries

Four A06B-6050-K061 batteries or

D-size alkaline dry cells

CAUTION

• Four D-size alkaline dry cells (LR20) that are commercially available can be used

as batteries. A set of four A06B-6050-K061 batteries is optionally available from

FANUC.

• Replace all the four batteries with new ones. If old and new batteries are mixed,

the absolute position information in the absolute Pulsecoders may be lost.

4.2.4

Replacing the Battery Built into the Servo Amplifier

Use the following procedure to replace the special lithium battery.

<1> Detach the battery case.

<2> Replace the special lithium battery.

<3> Attach the battery case.

- 113 -

4.REPLACING AMPLIFIER

COMPONENTS

TROUBLESHOOTING

B-65285EN/04

CAUTION

•

Purchase the battery from FANUC because it is not commercially available. It is

therefore recommended that you have a backup battery.

•

When the built-in battery is used, do not connect BATL (B3) of connector

CXA2A/CXA2B. Also, do not connect two or more batteries to the same BATL (B3)

line. These connections are dangerous because battery output voltages may be

short-circuited, causing the batteries to overheat.

•

Install the battery in the servo amplifier in a direction that allows slack in the cable.

If the battery cable is under tension, a bad connection may occur.

•

If the +6 V pin and 0 V pin are short-circuited, the battery may overheat, blow out,

or catch fire, or the absolute position information in the absolute Pulsecoders may

be lost.

•

When inserting the connector, align it to the connector pins.

Insertion direction

Red: +6 V

Connector

Black: 0 V

CX5X

Battery

+6 V

Battery case

0 V

[Battery sets and outlines]

Battery case

Battery ordering

Manufacturer

Applicable servo amplifier

ordering drawing

Outline

drawing number

model number

number

αi series

60/90 mm width

A06B-6114-K505

A06B-6114-K504

BR-2/3AGCT4A

(Note)

(Panasonic)

αi series

150/300 mm width

A06B-6114-K506

NOTE

When using an old-type battery BR-CCF2TH, order a battery case applicable for

battery A06B-6114-K504.

Used batteries

Old batteries should be disposed as "INDUSTRIAL WASTES" according to the regulations of the country

or autonomy where your machine has been installed.

- 114 -

4.REPLACING AMPLIFIER

B-65285EN/04

TROUBLESHOOTING

COMPONENTS

4.2.5

Notes on Replacing a Battery (Supplementary Explanation)

4.2.5.1 Battery connection modes

For absolute Pulsecoders, there are two types of battery connection modes: "Connecting batteries in a

separate battery case" and "connecting batteries built into the Servo Amplifier." For details, refer to

Subsection 9.3.2.10, "Connecting the battery (for the absolute Pulsecoder)," in the FANUC SERVO

AMPLIFIER αi series Descriptions (B-63282EN).

[Batteries in a separate battery case]

Battery case

A06B-6050-K060

αiPS

αiSV

Battery

A06B-6050-K061

CXA2B

CXA2A

Connector

A06B-6110-K211

[Batteries built into the Servo Amplifier]

αiSV

Battery case

Battery

CX5X

4.2.5.2 Connecting the battery for the α series motor

The Pulsecoder for the α series servo motor is not incorporated with a backup capacitor as standard. To

keep the absolute position information in the absolute Pulsecoder, you need to keep the control power

turned on during battery replacement. Follow the procedure explained below.

[Replacing procedure for the battery]

Make sure that the power to the Servo Amplifier is on (the 7-segment LED on the front of the SVM is

on).

Make sure that the emergency stop button of the system has been pressed.

Make sure that the motor is not activated.

Make sure that the DC link charge LED of the SVM is off.

Remove the old battery, and install a new battery.

This completes the replacement. You can turn off the power to the system.

- 115 -

4.REPLACING AMPLIFIER

COMPONENTS

TROUBLESHOOTING

B-65285EN/04

WARNING

1 When replacing the battery, be careful not to touch bare metal parts in the panel.

In particular, be careful not to touch any high-voltage circuits due to the electric

shock hazard.

2 Before replacing the battery, check that the DC link charge confirmation LED on

the front of the servo amplifier is off. Neglecting this check creates an electric

shock hazard.

3 Install the battery with correct polarity. If the battery is installed with incorrect

polarity, it may overheat, blow out, or catch fire.

4 Avoid a short-circuit between the +6 V and 0 V lines of a battery or cable. A

short-circuit may lead to a hot battery, an explosion, or fire.

4.2.5.3 Notes on attaching connectors

If an excessive strain is applied to a connector when it is inserted or removed, a poor contact may result.

When inserting and removing the battery connector, therefore, be careful not to apply an excessive

wrenching force to it; just follow the instructions given in the following table.

(1) Attaching connectors

Check the attachment

<1>

position.

Plug the cable connector while

<2>

raising it slightly.

10 degrees or less

Here, the angle of the cable

<5>

connector to the horizontal

must be 5 degrees or less.

5 degrees or less

After passing the lock pin,

<3>

insert the connector straight.

The attachment of the

<4>

connector is completed.

- 116 -

4.REPLACING AMPLIFIER

COMPONENTS

TROUBLESHOOTING

B-65285EN/04

4.3

HOW TO REPLACE THE FUSES

In the αi series, a printed-circuit board can be removed and inserted from the front of the servo amplifier.

The printed-circuit board removal/insertion procedure is common to the Power Supply, Servo Amplifier,

and Spindle Amplifier.

NOTE

1 If a fuse blows, it is likely that there is a short-circuit in the power supply for a

device (such as a sensor) connected to the Servo Amplifier.

After checking that all devices connected to the Servo Amplifier are normal,

replace the fuse.

If you do not remove the cause, it is very much likely that the fuse will blow again.

2 Do not use any fuse not supplied from FANUC.

3 Before replacing a fuse, check a marking on it with that on the printed-circuit

board. Be careful not to mount a fuse with an incorrect rating.

Hold the upper and

lower hooks.

Pull the printed-circuit

board toward you.

Printed circuit board

To insert the printed-circuit board, reverse the above procedure.

Ensure that the upper and lower hooks snap into the housing.

If the printed-circuit board is not inserted completely, the housing remains lifted. Pull out the printed-circuit

board and insert it again.

- 118 -

MOTOR/DETECTOR/AMPLIFIER

1.MOTOR/DETECTOR/AMPLIFIER

B-65285EN/04

PREVENTIVE MAINTENANCE

This chapter describes preventive maintenance of motors, detectors, and amplifiers that is to be performed

by the customer the machine uses.

Contents

MOTOR/DETECTOR/AMPLIFIER PREVENTIVE MAINTENANCE ... 124

1.1

LIST OF MANUALS RELATED TO MOTORS AND AMPLIFIERS

124

1.2

PREVENTIVE MAINTENANCE OF MOTORS AND DETECTORS

125

1.2.1

Warnings, Cautions, and Notes on Preventive Maintenance of Motors and

Detectors

125

1.2.2

Preventive Maintenance of a Motor (Common to All Models)

127

1.2.2.1

Main inspection items

127

1.2.2.2

Periodic cleaning of a motor

130

1.2.2.3

Notes on motor cleaning

130

1.2.2.4

Notes on the cutting fluid (informational)

130

1.2.3

Routine Inspection of a Spindle Motor with a Through Hole

131

1.2.4

Preventive Maintenance of a Built-in Spindle Motor and Spindle Unit

131

1.2.4.1

Routine inspection of the FANUC-NSK spindle unit

132

1.2.4.2

Maintenance of the FANUC-NSK spindle unit

132

1.2.4.3

Test run of the FANUC-NSK spindle unit

133

1.2.4.4

Storage method of the FANUC-NSK spindle unit

133

1.2.5

Preventive Maintenance of a Linear Motor

133

1.2.5.1

Appearance inspection of the linear motor (magnet plate)

133

1.2.6

Maintenance of a Detector

134

1.2.6.1

Alarms for built-in detectors (αi and βi Pulsecoders) and troubleshooting

actions

134

1.2.6.2

Alarms for separate detectors and troubleshooting actions

135

1.2.6.3

Detailed troubleshooting methods

135

1.2.6.4

Maintenance of βiS motor Pulsecoders

137

1.3

PREVENTIVE MAINTENANCE OF SERVO AMPLIFIERS

138

1.3.1

Warnings, Cautions, and Notes on Operation of Servo Amplifiers

138

1.3.2

Preventive Maintenance of a Servo Amplifier

141

1.3.3

Maintenance of a Servo Amplifier

142

1.3.3.1

Display of the servo amplifier operation status

142

1.3.3.2

Replacement of a fan motor

144

1.4

REPLACING BATTERY FOR ABSOLUTE PULSECODERS

145

1.4.1

Overview

145

1.4.2

Replacing Batteries

146

1.4.3

Replacing the Batteries in a Separate Battery Case

146

1.4.4

Replacing the Battery Built into the Servo Amplifier

147

- 123 -

1.MOTOR/DETECTOR/AMPLIFIER MOTOR/DETECTOR/AMPLIFIER

PREVENTIVE MAINTENANCE PREVENTIVE MAINTENANCE

B-65285EN/04

1 MOTOR/DETECTOR/AMPLIFIER

PREVENTIVE MAINTENANCE

1.1

LIST OF MANUALS RELATED TO MOTORS AND

AMPLIFIERS

Details of individual motors and amplifiers are described in the manuals listed in the table below. Before

performing periodic inspection or any other maintenance work, consult with the machine tool builder and, if

necessary, obtain the latest version of the corresponding manual shown in the list. The information about

the specifications of each device, such as the weight and winding resistance value, is given in the relevant

"DESCRIPTIONS" manual.

Specification

Manual name

Type of manual

number

FANUC AC SERVO MOTOR αi series

DESCRIPTIONS

B-65262EN

FANUC AC SERVO MOTOR βis series

DESCRIPTIONS

B-65302EN

FANUC SYNCHROUNOUS BUILT-IN SERVO MOTOR DiS series

DESCRIPTIONS

B-65332EN

FANUC LINEAR MOTOR LiS series

DESCRIPTIONS

B-65382EN

FANUC AC SPINDLE MOTOR αi series

DESCRIPTIONS

B-65272EN

FANUC AC SPINDLE MOTOR βi series

DESCRIPTIONS

B-65312EN

FANUC BUILT-IN SPINDLE MOTOR BiI series

DESCRIPTIONS

B-65292EN

FANUC SYNCHROUNOUS BUILT-IN SPINDLE MOTOR BiS series

DESCRIPTIONS

B-65342EN

FANUC - NSK SPINDLE UNIT series

DESCRIPTIONS

B-65352EN

FANUC SERVO AMPLIFIER αi series

DESCRIPTIONS

B-65282EN

FANUC SERVO AMPLIFIER βi series

DESCRIPTIONS

B-65322EN

FANUC AC SERVO MOTOR αi series

FANUC AC SERVO MOTOR βi series

PARAMETER MANUAL

B-65270EN

FANUC LINEAR MOTOR LiS series

FANUC SYNCHRONOUS BUILT-IN SERVO MOTOR DiS series

FANUC AC SPINDLE MOTOR αi/βi series

PARAMETER MANUAL

B-65280EN

BUILT-IN SPINDLE MOTOR Bi series

FANUC AC SERVO MOTOR αis/αi series

AC SPINDLE MOTOR αi series

MAINTENANCE MANUAL

B-65285EN

SERVO AMPLIFIER αi series

FANUC AC SERVO MOTOR βis series

AC SPINDLE MOTOR βi series

MAINTENANCE MANUAL

B-65325EN

SERVO AMPLIFIER βi series

FANUC SERVO AMPLIFIER βi series

MAINTENANCE MANUAL

B-65395EN

FANUC SERVO GUIDE

OPERATOR’S MANUAL

B-65404EN

FANUC AC SERVO MOTOR αis/αi/βis series

SERVO TUNING

B-65264EN

PROCEDURE (BASIC)

- 124 -

MOTOR/DETECTOR/AMPLIFIER

1.MOTOR/DETECTOR/AMPLIFIER

B-65285EN/04

PREVENTIVE MAINTENANCE

1.2

PREVENTIVE MAINTENANCE OF MOTORS AND

DETECTORS

1.2.1

Warnings, Cautions, and Notes on Preventive Maintenance of

Motors and Detectors

This subsection contains the safety precautions for motor and detector preventive maintenance, which are

classified into "warnings", "cautions", and "notes" according to their bearing on safety. Make sure that you

understand and comply with these precautions when carrying out the maintenance work.

WARNING

•

Make sure that you are safely dressed and have a safe working environment when

performing preventive maintenance for a motor.

Be dressed safely, e.g. by wearing gloves and safety shoes, to protect against injury due to an

edge or protrusion and electric shock.

Have the work done by more than one person, where possible, so that immediate action can be

taken if an accident occurs when handling a motor.

A motor is heavy. When moving it, use a crane or other appropriate equipment to protect against

injury. For information about the weight of the motor, refer to its DESCRIPTIONS manual

(shown earlier).

Clothes or fingers can be caught in a rotating motor or come into contact with a moving part of it.

Standing in the direction of motor rotation (direction of motion) can pose a risk of injury. Before

rotating a motor, check that there is no object that is thrown away by motor rotation.

•

Be careful about electric shock, fire, and other accidents.

Do not handle a motor with a wet hand.

To prevent electric shock, make sure that no conductive object, such as a terminal, is exposed

when the motor is powered on.

Before touching a motor or any surrounding part, check that the power is shut off and take

appropriate safety precautions.

High voltage remains across power line terminals of a motor even after the power is shut off (for

at least five minutes). Do not touch a motor in such a condition or connect it to other equipment.

A loose or disconnected terminal, short-circuited terminals, or a terminal connected to the ground

can cause overheating, spark, fire, or damage to the motor. Take appropriate precautions to

prevent these accidents.

When placed near any inflammable object or material, a motor can be ignited, catch fire, or

explode. Avoid placing it near such object or material.

•

Do not disassemble or modify a motor.

Motors such as linear motors, synchronous built-in servo motors, and synchronous built-in spindle

motors contain very strong magnets. If electronic medical apparatus comes near, these motors can

cause the apparatus to malfunction, potentially putting the user's life in danger. Also, disassembling or

modifying a motor can cause a failure, regardless of the type of motor. Do not disassemble or modify

a motor in any way not specified by FANUC.

- 125 -

1.MOTOR/DETECTOR/AMPLIFIER MOTOR/DETECTOR/AMPLIFIER

PREVENTIVE MAINTENANCE PREVENTIVE MAINTENANCE

B-65285EN/04

CAUTION

• Ensure that the specified cooling conditions are met.

If the specified cooling conditions are not met (the motor is insufficiently or excessively cooled), the

motor can fail. Problems that can cause a motor failure, such as liquid piping clog, leakage, and fan

motor trouble, should be eliminated through periodic inspection. Do not drive the motor when the

cooling system is in an abnormal condition.

• Do not change the system configuration.

Do not change the configuration of the system when it is running normally. Doing so can cause an

accident or failure. If you disconnect a cable for maintenance or some other purpose, take an

appropriate measure, such as putting a mark on it, to ensure you can restore the original state.

• Use the tapped holes of a motor only to move the motor.

Do not use the tapped holes of a motor to lift or move any other object along with the motor. Doing so

can damage the motor. Depending on the type of motor, the place and direction in which the motor can

be lifted may be predetermined. For details, refer to the DESCRIPTIONS manual of the motor (shown

earlier).

• Do not touch a motor when it is running or immediately after it stops.

A motor may get hot when it is running. Do not touch the motor before it gets cool enough. Otherwise,

you may get burned.

NOTE

• Do not remove a nameplate from a motor.

The nameplate is used to identify the motor during maintenance work. If a nameplate comes off, be

careful not to lose it.

• Do not step or sit on a motor, and avoid applying shock to a motor.

Any of these acts can deform or break the motor or affect its component, crippling the normal motor

operation. Do not put a motor on top of another motor.

• Comply with the specified conditions when conducting an electric test (winding

resistance test, insulation resistance test, etc.) for a motor or other device or

supplying power.

Conduct an electric test according to the specified method. Conducting such a test by any method

that is not specified can damage the motor.

Do not conduct a dielectric strength test or insulation test for a Pulsecoder or other detector, or do

not apply a commercial power source voltage. Doing so can destroy the internal elements.

• Perform preventive maintenance

(inspection of the external appearance,

measurement of winding resistance, insulation resistance, etc.) and cleaning on a

regular basis.

To use a motor safely throughout its entire service life, perform preventive maintenance and cleaning

on a regular basis. Be careful, however, because excessively severe inspection (dielectric strength test,

etc.) can damage its windings. For information about winding resistance values, refer to the

DESCRIPTIONS manual of the motor (its specification number is shown in this manual). Information

about insulation resistance is given later in this manual.

- 126 -

MOTOR/DETECTOR/AMPLIFIER

1.MOTOR/DETECTOR/AMPLIFIER

B-65285EN/04

PREVENTIVE MAINTENANCE

NOTE

• This manual is focused on the preventive maintenance work to be performed for a

single FANUC motor or detector alone. The information contained herein may not

apply depending on the type or configuration of the machine. When reading this

manual, refer to the manual of the machine as well. If you have any questions or

doubts, do not act on your own; please contact the machine tool builder or

FANUC.

• For detailed information about a motor, see the manual list shown earlier and, if

necessary, obtain the latest version of the corresponding manual.

1.2.2

Preventive Maintenance of a Motor (Common to All Models)

This subsection describes the common preventive maintenance items to be handled regardless of the model

of the motor. For the items specific to a particular motor model, see one of the subsequent subsections that

pertains to that particular motor model.

CAUTION

• The preventive maintenance method differs from machine to machine in many

respects. Depending on the machine in use, it may be difficult for the user to

perform periodic inspection or cleaning. If you are not sure about anything as to

preventive maintenance, consult with the machine tool builder and ensure that you

can perform periodic inspection and cleaning.

• The machine should be used within the scope of specification defined by the

machine tool builder. Using the machine in any way that is outside the specified

scope can reduce the motor's service life or cause a failure.

1.2.2.1 Main inspection items

The following table summarizes the main inspection items for a motor. If any of these items is found to be

abnormal, stop the use of the machine immediately and fix the abnormal part by repairing or replacing

it. At the same time, identify and remove the cause and take a measure to prevent its recurrence. If it is

difficult to take a preventive measure or to prevent its recurrence, consult with the machine tool builder or

FANUC.

Appearance of

Crack or

Check the motor for any scar, crack, deformation, bulge, etc.

the motor

deformation

If the interior of the motor is visible or there is interference with a

peripheral component, it is imperative to replace the motor or the

peripheral component.

A light peel-off or scar of the surface may be repairable; consult with

FANUC.

Wet or dirty part

If you find any wet or dirty part, clean it immediately.

A preventive measure is needed if the part in question remains wet

continually due to cutting fluid or dew condensation.

Operating

Temperature,

Comply with the operating conditions of the machine. For details of the

conditions

humidity, etc.

operating conditions of a specific motor, refer to the corresponding

DESCRIPTIONS manual. Generally, the ambient temperature should be

0°C to 40°C (or 30°C for a spindle unit) and dew condensation is not

allowed. In a place subject to severe vibration, the components of the

motor may be broken.

- 127 -

1.MOTOR/DETECTOR/AMPLIFIER MOTOR/DETECTOR/AMPLIFIER

PREVENTIVE MAINTENANCE

B-65285EN/04

Connection

Cable

Check for any cable sheath damage, exposed conductor, damaged

state

conduit or cable bearing, abnormal bending, loose terminal, etc.

If there is any trace of fluid flowing, the fluid may have entered the inside

of the motor or connector. It is necessary to make a check and take a

measure to prevent recurrence.

Connector/terminal

Check for any cracked, exposed, loose, or removed terminal or

connector, etc.

Fluid causes a failure; be sure to remove fluid.

A scarred or damaged connector or terminal needs to be replaced. In the

case of a resin molded motor, such as a linear motor, the motor needs to

be replaced.

Operation of

Noise/vibration

Check for any abnormal noise or vibration not only when the motor is

the motor

running (the spindle is rotating) but also when it is stopped.

Abnormal noise heard when the motor is rotating indicates an

abnormality of the bearing or a failure inside the motor.

If abnormal noise is generated from the connection section of a Spindle

Amplifier, check the following items:

Belt connection: Check whether the belt tension is appropriate.

Gear connection: Check whether an appropriate value is set for the gear

backlash.

Coupling connection: Check whether the coupling is free from

deformation, crack, and looseness.

Movement

Check that the motor operates normally and smoothly.

If the circuit breaker trips at the same time the motor starts to operate, it

indicates abnormal motor windings.

Heat

Check whether the motor does not overheat during the normal operation

cycle.

Note: While the motor is running or immediately after it is stopped, the motor

surface may become very hot. Instead of touching the motor directly by hand,

use a thermolabel, surface thermometer, etc.

Electric

Winding resistance

If the resistance value exceeds the specified range, the motor needs to be

characteristics

replaced.

of the motor

Note: When conducting winding resistance measurement, disconnect the

motor from the amplifier and measure the resistance at the power line or

connector closest to the motor.

Insulation

For the measuring method and judgment criteria, see the table that follows.

resistance

Cooling fan

Noise/vibration

Check that the fan blows air normally without causing abnormal noise or

(for a model

vibration.

with a fan

If abnormal noise is heard even when the motor is stopped, it indicates a

motor)

fan motor failure.

Movement

If the power is on and if the fan does not operate or the fan blades cannot

be moved even manually, or if the fan blades are rotating but no cooling

wind is blown out, the fan motor may have cutting chips or sludge

accumulated in it and needs to be cleaned.

If the fan does not operate normally for any other reason, the fan motor

needs to be replaced.

- 128 -

MOTOR/DETECTOR/AMPLIFIER

1.MOTOR/DETECTOR/AMPLIFIER

B-65285EN/04

PREVENTIVE MAINTENANCE

Forcible

Dew condensation

Check that forcible cooling does not cause dew condensation on the

cooling unit

(over-cooling)

motor surface. Dew condensation is likely particularly when the cooling

(when using an

unit continues to run after the machine is stopped. In that case, be sure

external

to make this check.

cooling unit

Dew condensation or water drop on the motor surface can reduce the

such as liquid

motor's service life. It is necessary to wipe it dry and take a measure to

cooling unit)

prevent recurrence.

Liquid

Check the cooling pipe for leakage or clog. Do not drive the motor unless

leakage/clog

the leakage or clog is fixed.

Liquid leakage from a spindle motor with a through hole indicates a

failure of the coolant joint. In this case, the joint needs to be replaced.

In the case of liquid leakage from a linear motor (coil slider), the linear

motor (coil slider) needs to be replaced.

If the motor gets wet due to liquid leakage or any other cause, it is

necessary to clean and dry the motor and perform electric characteristic

checks (winding resistance/insulation resistance).

Insulation resistance measurement

The following table shows the judgment criteria to be applied when measuring insulation resistance

between winding and frame using a megohmmeter (500 VDC).

Insulation resistance

Judgment

100M Ω or higher

Acceptable

The winding has begun deteriorating. There is no problem with the performance at present.

10M to 100M Ω

Be sure to perform periodic inspection.

The winding has considerably deteriorated. Special care is in need. Be sure to perform

1M to 10M Ω

periodic inspection.

Lower than 1M Ω

Unacceptable. Replace the motor.

If insulation resistance drops sharply during a short period of time or if the circuit breaker trips, the cutting

fluid or other foreign matter may have entered the inside of the motor or cable. In that case, contact the

machine tool builder or FANUC for instructions.

CAUTION

• Let the motor dry and cool to room temperature before winding or insulation

resistance is measured. Otherwise, not only an accurate measurement cannot

be performed but also the motor may be damaged.

• The winding or insulation resistance measurement should be performed on the

motor alone, with its power line disconnected.

Measuring insulation resistance with the motor connected to the amplifier may

damage the amplifier.

• During insulation resistance measurement, applying voltage to the motor for a

long time may further deteriorate the insulation of the motor. Therefore, the

measurement of insulation resistance should be performed in a minimum amount

of time where possible.

• When disconnecting the power line and other cables, take an appropriate

measure, such as labeling, to ensure that they can be restored to their original

state.

- 129 -

1.MOTOR/DETECTOR/AMPLIFIER MOTOR/DETECTOR/AMPLIFIER

PREVENTIVE MAINTENANCE PREVENTIVE MAINTENANCE

B-65285EN/04

1.2.2.2 Periodic cleaning of a motor

Periodic cleaning is necessary to remove an accumulation of cutting chips or sludge that may eventually

cause a failure. Also, leaving the cutting fluid or other chemical substance attached for a long time can

reduce the motor's service life substantially. When forcible cooling is provided by a liquid or air cooling

unit, check the unit for pipe clog, fan failure, etc. and perform cleaning periodically to ensure that the

coolant flows smoothly and that the motor is cooled properly.

WARNING

Depending on the type of motor, the handling may involve a risk and require safety

education in advance. Also, some machines are difficult for users to clean on their

own. If you are to clean the motor, consult with the machine tool builder in advance

with regard to the cleaning method, safety education, etc.

1.2.2.3 Notes on motor cleaning

A motor is an electric product, which is incompatible with most kinds of fluid. When removing cutting

chips, sludge, cutting fluid, etc. during cleaning, note the following.

Note on cleaning

Measure

Do not sprinkle or spray detergent or any other fluid over the motor (including its

Do not sprinkle fluid.

peripheral components), or do not wash the motor by submerging it in such fluid. When

Do not wash by

cleaning the motor, use a cloth moistened with a small amount of neutral detergent so

submerging.

that the fluid does not enter the inside the motor.

Solvent may damage the motor; do not use one. If the dirt is difficult to remove with

neutral detergent, use a cloth moistened with a small amount of industrial alcohol (e.g.,

Do not use solvent.

IPA). Be careful, however, because rubbing with force or repeatedly may damage the

coated or resin surface.

If the motor is wet or moistened after cleaning, dry it before supplying power and before

Do not leave the motor

performing electric tests. When drying the motor in an oven, make sure that the

wet or moistened.

temperature is below 40°C and that hot air does not blow directly against the motor.

1.2.2.4 Notes on the cutting fluid (informational)

Depending on the type of cutting fluid used, the motor and amplifier may be affected greatly. Take due care

because, even if you ensure that they do not come into direct contact with the fluid, a mist or atmosphere of

the fluid can cause the problems described below.

Type of cutting fluid

Expected problem

requiring care

Some types of cutting fluid contain highly active sulfur. If such cutting fluid enters the

Cutting fluid containing

inside of the motor or amplifier, it causes copper, silver, and other kinds of metal to

highly active sulfur

corrode, leading to a component failure.

Some types of cutting fluid containing such substance as polyalkylene glycol have

Synthetic cutting fluid

very high permeability. Such cutting fluid permeates into the inside of the motor,

with high permeability

causing insulation deterioration or component failure.

Some types of cutting fluid that enhance their alkaline property using such substance as

Highly alkaline,

alkanolamine remain highly alkaline - pH10 or higher - when diluted. If such cutting

water-soluble cutting

fluid is left attached for a long time, its chemical change will deteriorate the resin and

fluid

other materials of the motor and amplifier.

Other types of cutting fluid not mentioned above may cause various unexpected problems. If any problem

arises for which the cutting fluid is thought to be responsible, consult with the machine tool builder or

FANUC.

- 130 -

MOTOR/DETECTOR/AMPLIFIER

1.MOTOR/DETECTOR/AMPLIFIER

B-65285EN/04

PREVENTIVE MAINTENANCE

1.2.3

Routine Inspection of a Spindle Motor with a Through Hole

• Check whether coolant does not always leak from the drain on the rotation joint support housing. (See

Fig. 2)

• Check whether coolant does not always leak from the notch on the rotation joint support housing. (See

Fig. 2)

• Check whether coolant leaking from the coolant joint does not leak from the coupling. (See Fig. 3)

• Check whether leaking coolant is not collected in the coupling box.

Coupling

Rotation joint support housing

Fig. 1: Example of using a coolant-through spindle motor

Rotation joint support

housing

Convex type

Concave type

凸タイプ

凹タイプ

Drain

Notch

Spare drain

Coolant joint

Fig. 2: Rotation joint support housing

Fig. 3: Example of a coolant joint

1.2.4

Preventive Maintenance of a Built-in Spindle Motor and

Spindle Unit

This subsection contains the safety precautions you need to bear in mind when performing preventive

maintenance for a built-in spindle motor (BiI or BiS Series) or the FANUC-NSK spindle unit. In some cases,

the work may involve a life-threatening risk or cause substantial damage. Make sure that you fully

understand these safety precautions before carrying out the work.

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FANUC AC SERVO MOTOR ai series, AC SPINDLE MOTOR ai series, SERVO AMPLIFIER ai series. MAINTENANCE MANUAL - page 5