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FANUC AC Servo Amplifiers βi Series. Description Manual (B-65322EN/02) - page 2

3.SPECIFICATIONS

SVM

B-65322EN/02

3.5

DERATING

Consider derating as shown below, according to ambient

temperatures.

SVM1-20i

Output derating for single-phase input

1200

900

With fan

750

Without fan

500

0

0

35

45

55

Temperature (°C)

SVM1-40i

Output derating for 3-phase input

13.0

9.8

0

0

45

55

Temperature (°C)

SVM1-80i

Output derating for 3-phase input

18.5

15.0

0

0

45

55

Temperature (°C)

- 12 -

B-65322EN/02

SVM

3.SPECIFICATIONS

3.6

SEPARATED REGENERATIVE DISCHARGE RESISTOR

3.6.1

When No Separated Regenerative Discharge Resistor Is

Needed

No separated regenerative discharge resistor is needed if the energy

regenerated per regeneration cycle is not higher than the amount [J] of

energy listed below.

Note in mind that an incorrect connection can damage the

amplifier.

Table 3.6.1 Maximum regenerative energy amount permitted for

individual amplifier models

Amplifier model

Permissible regenerative energy amount

SVM-4i

16 [J]

SVM-20i

How to calculate the amount of energy regenerated per regeneration cycle

- For horizontal movement

(a) SI unit system

−3

2

−2

P=

(5.48×10

⋅ (Jm + JL) ⋅Vm

−5.23×10

⋅ ta ⋅Vm ⋅

TL)[J]

(Expression1）

Jm: Rotor inertia of the motor [kg⋅m²]

JL: Motor-shaft-converted inertia of the load [kg⋅m²]

Vm: Motor speed at rapid traverse [min^-1]

ta: Rapid traverse acceleration/deceleration time [sec]

TL: Machine frictional torque (motor-converted value) [N⋅m]

(b) CGS unit system

−4

2

−3

P=

(5.37×10

⋅ (Jm + JL) ⋅Vm

−5.13×10

⋅ ta ⋅Vm ⋅

TL)[J]

(Expression 1)

Jm: Rotor inertia of the motor [kgf⋅cm⋅sec²]

JL: Motor-shaft-converted inertia of the load [kgf⋅cm⋅sec²]

Vm: Motor speed at rapid traverse [min^-1]

ta: Rapid traverse acceleration/deceleration time [sec]

TL: Machine frictional torque (motor-converted value) [kg⋅cm]

- 13 -

3.SPECIFICATIONS

SVM

B-65322EN/02

- For vertical movement

The amount of regenerative discharge (power [W]) when the operation

duty for downward rapid traverse is D(%)

(a) SI unit system

D

w2

=

1.047

×10−1

⋅ Th ⋅ Vm ×

[W

]

(Expression 5)

100

Th: Upward torque that the motor applies at the time of

downward rapid traverse [N⋅m]

Vm: Motor speed at rapid traverse [min^-1]

D : Operation duty [%] for downward rapid traverse

D is set to 50% maximum. Usually, D is less than 50%.

(b) CGS unit system

D

w2

=

1.026

×10−2

⋅ Th ⋅ Vm ×

[W

]

(Expression 5)

100

Th: Upward torque that the motor applies at the time of

downward rapid traverse [kg⋅cm]

Vm: Motor speed at rapid traverse [min^-1]

D : Operation duty [%] for downward rapid traverse

D is set to 50% maximum. Usually, D is less than 50%.

If the motor load moves up and down, the sum of expressions 4 and 5

gives the amount of energy regenerated per regeneration cycle.

w = w1 + w2 [W]

(Expression 6)

From Table 3.6.2, select a separated regenerative discharge resistor

whose regenerative discharge capacity is larger than the regenerative

energy obtained in expression 6.

Table 3.6.2 Regenerative discharge capacity of separated regenerative

discharge resistors

Separated regenerative discharge

Regenerative

Condition

resistor

discharge capacity

A06B-6130-H401 (30 Ω)

20 W

Wind speed

(Caution)

100 W

of 0 m/s

A06B-6130-H402 (30 Ω)

CAUTION

Do not use a regenerative resistor cable longer

than 1 m. Otherwise, it is likely that the

regenerative circuit in the amplifier may

malfunction or the amplifier may be damaged.

NOTE

If the permissible value of a separated

regenerative discharge resistor is exceeded during

use, the unit overheats, resulting in the built-in

thermostat operating to issue an overheat alarm.

- 16 -

B-65322EN/02

SVM

3.SPECIFICATIONS

3.6.3

When Amplifier Models SVM-40i and SVM-80i Are Used

If the amount of regenerative discharge from a servo motor exceeds

the regenerative discharge capacity of the regenerative discharge

resistor incorporated in the corresponding servo amplifier, a separated

regenerative discharge resistor is needed.

If the motor regenerative discharge amount R obtained in Subsection

3.6.2 exceeds the corresponding value listed in Table

3.6.3

(a),

“Regenerative discharge capacity of the regenerative discharge

resistor incorporated in servo amplifiers,” use a separated regenerative

discharge resistor.

Table 3.6.3 (a) Regenerative discharge capacity of the regenerative

discharge resistor incorporated in servo amplifiers

Servo amplifier

Capacity

A06B-6130-H003

50 W

A06B-6130-H004

130 W

The following table lists the separated regenerative discharge resistors

that are available.

Select a separated regenerative discharge resistor whose discharge

capacity satisfies your requirement.

Table 3.6.3(b) Regenerative discharge capacity of regenerative

discharge resistors installed separately from servo amplifiers

Separated regenerative

Wind speed of 0

Wind speed

Wind speed

discharge resistor

m/s

of 2 m/s

of 4 m/s

A06B-6089-H500

R = 200W

R = 400 W

R = 600 W

A06B-6089-H713

Incorporates a cooling fan motor.

R = 800 W

A06B-6089-H714

Incorporates a cooling fan motor.

R = 1200 W

- 17 -

3.SPECIFICATIONS

SVM

B-65322EN/02

Set-up switch (for changing the DC alarm level)

Switch setting (for the SVM1-40i and SVM1-80i)

The SVM1-40i and SVM1-80i each have four switches on their front

panel for protecting regenerative resistors. Be sure to set these

switches to the positions that match the resistors used.

CAUTION

An incorrect switch setting may damage the

regenerative resistor.

These switches are numbered 1 to 4. The one on top is No. 1, the

one below it is No. 2, and so on. When the lever of a switch is at the

left, the switch is on. When it is at the right, the switch is off.

ON

(1) Setting of switches 3 and 4

The setting of switches

3 and 4 varies depending on what

regenerative discharge resistor is used.

⇒ If a switch is incorrectly set up, it is impossible to detect a

regenerative overheat alarm normally.

Switch 3

Switch 4

Regenerative discharge resistor

ON

ON

Incorporated in the amplifier

OFF

ON

Separate unit A06B-6089-H500

OFF

OFF

Separate unit A06B-6089-H713, A06B-6089-H714

(2) Setting of switches 1 and 2

Neither switch 1 nor 2 is used. Leave them off.

- 18 -

B-65322EN/02

SVM

3.SPECIFICATIONS

Cautions for selecting a regenerative discharge resistor

WARNING

1 Regenerative discharge resistors may become

very hot (100 to 200 °C). Be careful not to touch

them.

2 Before touching a regenerative discharge resistor,

for example, for maintenance purposes, turn off all

power to the amplifier, wait for at least 30 minutes,

and make sure that the DC link charge indicator

LED (CAUTION CHARGE) is off and the

regenerative resistor is sufficiently cold.

3 When mounting a regenerative resistor, keep it

sufficiently far from any flammable.

(1) Related ordering numbers

Ordering number of

Capacity

regenerative

Resistance

Wind speed

Remarks

discharge resistor

0 m/s

2 m/s

4 m/s

A06B-6130-H401

30 Ω

20 W

-

-

For 4/20 A

A06B-6130-H402

30 Ω

100 W

-

-

For 4/20 A

A06B-6089-H500

16 Ω

200 W

400 W

600 W

For 40/80 A

A06B-6089-H713

16 Ω

Incorporates a cooling fan motor.

800 W

For 40/80 A

A06B-6089-H714

16 Ω

Incorporates a cooling fan motor.

1200 W

For 40/80 A

(2) Mounting requirements

(a) Cautions in mounting

A06B-6130-H401

Install these models in a completely sealed cabinet.

A06B-6130-H402

A06B-6089-H500

Place the pin side and resistor side (heat generating section) of these models, respectively, in

A06B-6089-H713

a completely sealed cabinet and an exhaust air duct.

(a) Use accompanying gaskets.

(b) Make arrangements so that the pin side and resistor side (heat generating section) can

A06B-6089-H714

be kept from coolant, oil mist, and cuttings.

(c) When taking in fresh air to the resistor (heat generating section), use an air filter at the air

inlet. Also seal the cable inlets, cable outlets and doors securely.

(b) Ambient temperature

0 to 55 °C (at operation)

-20 to 60 °C (at keeping and transportation)

(c) Humidity

Normally 90 % RH or below, and condensation-free

(d) Vibration

In operation : Below 0.5 G

(e) Mounting direction:

Mount the unit securely while referring to the mounting

diagram given below.

- 19 -

3.SPECIFICATIONS

SVM

B-65322EN/02

Installation and connection of A06B-6130-H401

To connector CZ7

To connector CXA20

WARNING

1 Regenerative discharge resistors may become very hot (100 to 200 °C). Be

careful not to touch them.

2 Before touching a regenerative discharge resistor, for example, for maintenance

purposes, turn off all power to the amplifier, wait for at least 30 minutes, and make

sure that the DC link charge indicator LED (CAUTION CHARGE) is off and the

regenerative resistor is sufficiently cold.

3 When mounting a regenerative resistor, keep it sufficiently far from any flammable.

4 The minimum clearance between the regenerative resistor and the wall should be

10 mm.

- 20 -

5.POWER SUPPLY

SVM

B-65322EN/02

5.1

INPUT POWER SUPPLY

5.1.1

Three-phase Input Power Supply for Motor Power

-

Nominal rated voltage: 200 to 240 VAC

-

Allowable voltage fluctuation: -15% to +10%

-

Frequency: 50/60 Hz

-

Allowable frequency fluctuation: ±2 Hz

-

Power supply impedance: Voltage fluctuation cased by load (at

maximum output) not to exceed 7%

-

Power supply unbalance: Within ±5% of the rated voltage

NOTE

The allowable voltage fluctuation is a change

observed for several minutes. It is not a continuous

change.

5.1.2

Single-phase Input Power Supply for Motor Power

In European countries, power sources are

380 to 415 VAC and

neutral-grounded. To use the βi series amplifiers in these European

countries, it is necessary to install a power transformer at the input or

supply single-phase power.

To use the motors with single-phase power, observe the following:

Only the SVM1-20i and lower models can support single-phase input.

The other models use the three-phase input power supply

specifications only.

(1) Power supply specification

-

Nominal voltage rating: 220 to 240 VAC

-

Allowable voltage fluctuation: -15% to +10%

-

Frequency: 50/60 Hz

-

Allowable frequency fluctuation: ±2 Hz

-

Voltage fluctuation at acceleration/deceleration: 7% or less

NOTE

The allowable voltage fluctuation is a change

observed for several minutes. It is not a continuous

change.

5.1.3

Single-phase Input for Control Power

Be sure to use a stabilized power supply as the 24-V power supply for

amplifiers. The

24-V power supply for motor brakes cannot be

shared.

-

Nominal rated voltage: 24VDC

-

Allowable voltage fluctuation:

±10%

(including momentary

variations)

-

Power supply ratings

- 24 -

B-65322EN/02

SVM

5.POWER SUPPLY

Power supply rating per amplifier

FSSB interface

0.9A

- External 24-VDC power supply specifications

Recommended external

24-VDC power supply

(stabilized power

supply) specifications

(UL1950 must be

satisfied.)

Output voltage

+24V ±10% (21.6V to 26.4V)

(Including ripple voltage and noise. See

the figure below.)

Output current

The continuous load current must be at least

the current consumption of the CNC and

other units.

(at a highest temperature in the power

magnetics cabinet where the power supply is

installed)

Load variation (including surge current)

The above output voltage range must not be

exceeded by load variation.

AC input hold time at momentary disconnection

10mS (for -100%)

20mS (for -50％)

Permissible time of momentary 24-VDC disconnection

0.5mS (less than 21.6 V)

- 25 -

5.POWER SUPPLY

SVM

B-65322EN/02

(1) Timing chart

Momentary

Momentary disconnection

disconnection (-100%)

(-50%)

10mS

20mS

AC input voltage

26.4V

Output voltage

21.6V

Abrupt change

in load

Output current

0A

Figure Example of ripple voltage and noise due to switching power supply

26.4V

Noise

To be within

Ripple voltage

range

Noise

21.6V

Timing chart

- 26 -

B-65322EN/02

SVM

5.POWER SUPPLY

- Circuit configuration

The circuit configuration shown in

<1> and <2> below are not

permitted.

Prohibited

<1> Circuit examples in which the output voltage cannot be held at

the time of momentary disconnection (the voltage level lowers

below 21.6 V)

Example 1

Rectifier

AC input

circuit

CNC

Example 2

Rectifier

circuit

AC input

CNC

NOTE

A rectifier circuit performs full-wave rectification by

using diodes.

<2> Circuit examples in which the output voltage specification (21.6

V to 26.4 V) is exceeded by abrupt change in load

Example 1

βiSVM

Stabilized

AC input

βiSVPM

power

supply

Unit with

abrupt change

in load

Example 2

βiSVM

Stabilized

AC input

βiSVPM

power

supply

Unit with large

rush current

In case of

<2>, prepare an additional stabilized power supply

dedicated to a unit whose load changes abruptly, so that the βi SVM

and βi SVPM are not affected.

- 27 -

5.POWER SUPPLY

SVM

B-65322EN/02

5.2

POWER TRANSFORMER FOR EXPORTS

Use power transformer for an export when this servo amplifier unit is

used at a site where the line voltage is other than 200 to 240 VAC.

5.2.1

Specification

Table 5.2.1 Specification of power transformer

Ordering drawing number

A80L-0022-0005

A80L-0024-0006

A80L-0026-0003

A80L-0028-0001

FANUC drawing number

A80L-0022-0005

A80L-0024-0006

A80L-0026-0003

A80L-0028-0001

Rated capacity

2.2kVA

3.5kVA

5kVA

7.5kVA

200/220/230/240VAC (∆ connection)

Rated primary voltage

380/415/460/480/550VAC (Y connection)

±15%, 50/60Hz±2Hz; 3φ

Rated secondary voltage

210VAC

Rated secondary current

6.1A

9.6A

13.7A

20.6A

Voltage regulation at the

2%

secondary

Voltage deviation at the

±3%

secondary

Connection

∆-∆ connection or Y-∆ connection

Insulation

Class B (maximum allowable temperature : 130°C)

Ambient temperature

-20 to 55°C

Allowable temperature rise

135deg

Relative humidity

Max. 95%RH

Type

Dry type, natural air cooling type

Dielectric withstand voltage

2300VAC, for 1 minute

Weight

Max. 21kg

Max. 27kg

Max.36kg

Max. 42kg

Outline drawing

Fig. 8.1.3

Connection diagram

- 28 -

B-65322EN/02

SVM

6.INSTALLATION CONDITIONS AND NOTES

6.1

ENVIRONMENTAL CONDITIONS

Install a βi setting servo amplifier in a completely closed cabinet so

that the environment conditions indicated below can be satisfied.

(1) Ambient Temperature

Ambient temperature

0 to 55°C (operating)

-20 to 60°C (storage and transportation)

Ambient temperature of the accommodation cabinet 0 to 45°C

(2) Humidity

Usually, 95% RH or lower (no condensation)

(3) Vibration

No more than 0.5G during operation

(4) Atmosphere

Ensure that the electronic circuits are not exposed to corrosive

and conductive mist and waterdrops. (Note)

(5) Notes on installation

When installing an amplifier, consider the following:

(a) Ensure that the heat sink is not exposed to coolant, oil mist,

cuttings, and so forth. Otherwise, the cooling efficiency can

degrade, resulting in a failure to satisfy the characteristics of

the amplifier. Moreover, the life of semiconductors can be

adversely affected.

To introduce the open air for the heat sink, use an air filter

at the inlet.

Ensure that the cable inlet and outlet, door, and so forth are

sealed.

NOTE

The electronic circuits must be installed in an

environment of contamination level 2 defined in

IEC60664-1.

In order to satisfy contamination level 2 in a severe

environment for using machine tools, the servo

amplifier β series must be installed in a cabinet that

satisfy IP54.

If the cabinet does not have a structure for

preventing materials that adversely affect

amplifiers from getting into the cabinet, normal

operation and safety may fail. So, special care

should be taken.

(b) Ensure that dust, coolant, and so forth do not penetrate

through the exhaust vent. Moreover, ensure that the flow of

cooling wind is not interrupted.

(c) Ensure that the servo amplifier β series can be inspected,

removed, and reinstalled easily in maintenance.

- 31 -

6.INSTALLATION CONDITIONS AND NOTES SVM

B-65322EN/02

6.2

SELECTING A GROUND-FAULT CIRCUIT INTERRUPTER

Because the servo amplifier βi series uses the PWM inverter system

by transistors to drive a motor, high frequency leakage current flows

via the motor winding, power cable, and amplifier floating capacity to

ground. This may cause the ground-fault circuit interrupter or

ground-fault protective relay installed on the power supply side to

malfunction.

Therefore, when using a circuit breaker with a ground-fault circuit

interrupter, select an appropriate one having an inoperative current

value not smaller than the sum of the calculation results (a) and (b) to

prevent malfunctioning due to leakage current.

(a) Selection criterion per amplifier

Selection criterion:

2 mA per amplifier(*1)

(b) Selection criterion per motor

Selection criterion:

1 mA per motor(*1)

The following example shows how to use selection criteria <1> and

<2>:

Example:

When the system contains four βi SVM1 units

2 mA × 4 units (amplifiers) + 1 mA × 4 (motors) = 12 mA

→ Select a circuit breaker with an inoperative current of 12

mA or more(*2).

(A general ground-fault circuit interrupt applicable to this

example has a rated sensitivity current of 30 mA, and an

inoperative current of 15 mA.)

NOTE

1 The above selection criteria are provided in order

to select a circuit breaker with a ground-fault circuit

interrupter, and do not express accurate leakage

current values.

2 Depending on the frequency characteristic of the

ground-fault circuit interrupter, the circuit breaker

may malfunction. So, use a ground-fault circuit

interrupter usable for inverter circuits.

3 The above selection criteria are values in the

commercial frequency band. Some instruments

measuring leakage current may detect a high

frequency band and read larger values.

WARNING

Install a ground-fault circuit breaker.

To prevent fire and electric shock to a person, be

sure to install a ground-fault circuit breaker (for

inverter circuits).

- 32 -

B-65322EN/02

SVM

6.INSTALLATION CONDITIONS AND NOTES

6.3

NOISE PROTECTION

6.3.1

Separation of Signal Lines

If a power cable and signal cable run close to each other, noise can be

induced. So, ensure that a power cable is separated from a signal cable.

When a power cable and signal line cannot be separated from each

other for a reason, minimize the distance by which the two cables run

in parallel. When conduits are used, run a power cable through one

conduit, and run a signal cable through another conduit.

Cable type

Group

Signal

Action

Amplifier input power line

Separate these cables from those of

Motor power line

group B by bundling them separately

A

Magnetic contactor drive coil

(Note 1) or by means of

(Note 3)

electromagnetic shielding (Note 2).

Cable connecting the control

Separate these cables from those of

unit and servo amplifier

group A by bundling them separately

B

Sensor cable

(Note 1) or by means of

electromagnetic shielding (Note 2). In

Position coder cable

addition, shielding must be provided.

NOTE

1 The bundle of group A cables must be separated

from the bundle of group B cables by at least 10 cm.

2 Electromagnetic shielding involves shielding

groups from each other by means of a grounded

metal (steel) plate.

3 Attach a noise suppressor such as a spark killer to

the magnetic contactor drive coil.

Cabinet

Control unit

Spindle

Servo

amplifier

amplifier

Cable of

group B

Duct

To operator's

panel, motor,

etc.

Cable of group A

Section of duct

Group A

Group B

Shielding plate

- 33 -

6.INSTALLATION CONDITIONS AND NOTES SVM

B-65322EN/02

6.3.2

Grounding

A CNC machine tool has three separate ground systems:

(1) Signal ground (SG) system

The signal ground (SG) system provides the reference potential

(0V) for the electrical signal system.

(2) Frame ground (FG) system

The frame ground (FG) system is provided to ensure safety and

to shield external and internal noise. For example, the equipment

frames, unit cases, panels, and interface cables connecting

devices are all shielded.

(3) System ground system

The system ground system is designed to connect each unit and

the inter-unit frame ground system to ground.

Signal Ground system

Flame Ground system

Power

Servo

CNC

System Ground system

magnetics

amplifier

unit

Operator’s panel

Main unit

Power magnetics unit

Distribution board

WARNING

[Warning on ground system wiring]

1 The ground resistance of the system ground must

not exceed 100 Ω (class-3 ground).

2 System ground connection cables must have a

sufficiently large cross-sectional area to enable

them to safely carry the current that will arise in the

event of a mishap such as a short-circuit. (In

general, a cross-sectional area no less than that of

the AC power line must be provided.)

3 The system ground connection cable shall be

integrated with the AC power line, such that power

cannot be supplied if the ground wire is

disconnected.

- 34 -

B-65322EN/02

SVM

6.INSTALLATION CONDITIONS AND NOTES

6.3.3

Noise Suppressor

The AC/DC solenoid and relay are used in the power magnetics

cabinet.

A high pulse voltage is caused by coil inductance when these devices

are turned on or off.

This pulse voltage induced through the cable causes the electronic

circuits to be disturbed. In general, to reduce this pulse voltage, a

spark killer is used in AC circuits, while a diode is used in DC

circuits.

Spark killer

-

Use a spark killer consisting of a resistor and capacitor in series.

This type of spark killer is called a CR spark killer. (Use it under

AC)

(A varistor is useful in clamping the peak voltage of the pulse

voltage, but cannot suppress the sudden rise of the pulse voltage.

FANUC therefore recommends a CR spark killer.)

-

The reference capacitance and resistance of the spark killer shall

conform to the following based on the current (I(A)) and DC

resistance of the stationary coil:

Resistance (R)

: Equivalent DC resistance of the coil

Capacitance (C)

: I²/10 to I²/20 (µF)

I : Current at stationary state of the coil (A)

Equivalent circuit of

the spark killer

Spark killer

AC relay

Motor

Mount the noise

eliminator near a motor

Spark killer

or a relay coil.

CAUTION

Use a CR-type noise eliminator. Varistor-type noise

eliminators clamp the peak pulse voltage but

cannot suppress a sharp rising edge.

Diode

Diode (used for direct-current circuits)

Diode

DC relay

Use a diode which can withstand a voltage

up to two times the applied voltage and a

current up to two times the applied current.

- 35 -

6.INSTALLATION CONDITIONS AND NOTES SVM

B-65322EN/02

6.3.4

Cable Clamp and Shield Processing

-

Shield terminal processing

Process the terminal of the shield cover of a signal line according

to Chapter 10, "DETAILS OF CABLE CONNECTION".

-

Shield clamping

The amplifier cables that require shielding should be clamped by

the method shown below. This cable clamp treatment is for both

cable support and proper grounding of the shield. To insure

stable CNC system operation, follow this cable clamp method.

Partially peel out the sheath and expose the shield. Push and

clamp by the plate metal fittings for clamp at the part.

-

Installation of a ground plate

The user is to prepare a ground plate and install it according to

Fig. 6.3.4(b) to (e).

Ground plate

Cable

Metal

fittings

Fig.6.3.4(a) Cable clamp (1)

- 36 -

B-65322EN/02

SVM

6.INSTALLATION CONDITIONS AND NOTES

Machine side

installation

board

Control unit

Ground

plate

Metal fittings for

clamp

Shield cover

Fig.6.3.4(b) Cable clamp (2)

Prepare ground plate like the following figure.

Ground terminal

(grounded)

Hole for securing metal fitting clamp

Mount screw hole

Fig.6.3.4(c) Ground plate

- 37 -

6.INSTALLATION CONDITIONS AND NOTES SVM

B-65322EN/02

For the ground plate, use a metal plate of 2 mm or thicker, which

surface is plated with nickel.

Ground plate

Fig.6.3.4(d) Ground plate holes

(Reference) Outer drawings of metal fittings for clamp.

Max. 55mm

Fig.6.3.4(e) Outer drawings of metal fittings for clamp

Ordering specification for metal fittings for clamp

A02B-0214-K001 (2 pieces)

- 38 -

B-65322EN/02

SVM

6.INSTALLATION CONDITIONS AND NOTES

6.4

INSTALLING LIGHTNING SURGE ABSORBERS

At the power input of the power magnetics cabinet, install a surge

absorber between the power lines and between each power line and a

ground to protect the unit from a voltage surge caused by lightning.

How to install the surge absorber is shown below.

(1) Surge absorber for three-phase input

When using an integrated lightning surge absorber between the

power lines and between each power line and a ground

Lightning surge absorber between power

lines and between each power line and

ground (R.C.M-601BUZ-4)

To other units

(a)

Control power

(b)

supply input

Stabilized

power

G

supply

βi SVM

(24 VDC)

Circuit breaker 2

Ground plate

(5A)

Main circuit

R

200VAC

S

power

input

T

Ground-fault circuit interrupter

Circuit

Magnetic

AC line filter

for power magnetics cabinet

breaker 1

contactor

When using separate lightning surge absorbers between the power

lines and between each power line and a ground

Lightning surge absorber between

each power line and ground

(R.A.V-781BXZ-2)

Lightning surge absorber between

power lines (R.A.V-781BYZ-2)

To other units

(a)

Control power

(b)

input

Stabilized

power supply

G

(24 VDC)

βi SVM

Circuit breaker 2

Ground plate

(5A)

Main circuit

R

power

200VAC

S

input

T

Ground-fault circuit interrupter

Circuit

Magnetic

AC line filter

for power magnetics cabinet

breaker 1

contactor

- 39 -

6.INSTALLATION CONDITIONS AND NOTES SVM

B-65322EN/02

(2) Surge absorber for single-phase input

When using an integrated lightning surge absorber between the

power lines and between each power line and a ground

Lightning surge absorber between power

lines and between each line and ground

(R.C.M-601BUZ-4)

To other units

(a)

Control power

(b)

input

Stabilized

power

G

βi SVM

supply

(24 VDC)

Circuit breaker 2

Ground plate

(5A)

Main circuit

R

power

200VAC

S

T

input

Ground-fault circuit interrupter

Circuit

Magnetic

AC line filter

for power magnetics cabinet

breaker 1

contactor

When using separate lightning surge absorbers between the power

lines and between each power line and a ground

Lightning surge absorber between

each power line and ground

(R.A.V-781BXZ-4)

Lightning surge absorber between

power lines (R.A.V-781BYZ-2)

To other units

(a)

Control power

(b)

input

Stabilized

power

G

supply

βi SVM

(24 VDC)

Circuit breaker 2

Ground plate

(5A)

Main circuit

R

power

200VAC

S

input

T

Ground-fault circuit interrupter Circuit

Magnetic

AC line filter

for power magnetics cabinet breaker 1

contactor

- 40 -

B-65322EN/02

SVM

6.INSTALLATION CONDITIONS AND NOTES

(3) Surge absorber for three-phase input

WARNING

1

Make the wires shown with thick line in the above

diagram as short as possible in order to increase

the effect of the lightning surge absorber.

Wire Cross section : At least 2mm²

Length : Keep the total wire length (a+b) to

within 2m,where a = length of wire

used to connect lightning surge

absorber (1) b = length of wire used

to connect lightning surge absorber

(2)

2

When performing a dielectric strength test by

applying an overvoltage (such as 1000 or 1500

VAC) to a power line, remove lightning surge

absorber (2) so that it will not operate.

3

The circuit protector (5A) is intended to protect the

lines if a lightning surge absorber is damaged due

to a surge that is higher than the maximum

allowable voltage of the surge absorber.

4

Usually, no current flows through the lightning

surge absorbers. So the circuit protector (5A) may

be used also for other sections (such as power

supply module control power and spindle motor fan

power).

The

following table lists commercially available lightning surge

absorbers.

Table 6.4(a) Lightning surge absorbers (not complying with the relevant standards)

Manufacturer's

Maximum

Maximum

Lightning

Maximum allowable

specification

Clamp voltage

allowable surge

allowable surge

surge

circuit voltage

Okaya Electric

[V]±10%

current

voltage

absorber

[Vrms]

Industries

8/20µsec [A]

1.2/50µsec [V]

<1>

R･A･V-781BYZ-2

783

1000

12000

300

<2>

R･A･V-781BXZ-2A

783

1000

12000

300

Table 6.4(b) Lightning surge absorbers (complying with the relevant standards)

Manufacturer's

Maximum

Maximum

Lightning

Maximum allowable

specification

Clamp voltage

allowable surge

allowable surge

surge

circuit voltage

Okaya Electric

[V]±10%

current

voltage

absorber

[Vrms]

Industries

8/20µsec [A]

1.2/50µsec [V]

<1>

R･A･V-781BYZ-2

783

1000

12000

300

<2>

R･A･V-781BXZ-4

783

1000

12000

300

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