
B-65232EN/03 DESCRIPTIONS FOR FANUC AC SERVO MOTOR β series 8.BUILT-IN BRAKE
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[Models β
ββ
β1 to β
ββ
β6]
200VAC
Circuit breaker, etc
Relay
Coil
Contact
Spark killer
Surge absorber
Motor
coil
Ground
(to motor body)
Brake coil
(No polarity is
applied.)
Servo amplifier
Ground
(to motor body)
100VAC
Notes
(1) Use a full-wave rectified power of 100 VAC or use 90 VDC as
the brake power for the β series servo motor. Do not use a half-
wave rectified power of 200 VAC, because brake components
such as a surge absorber can be damaged.
(2) When full-wave rectification is used, carefully check the power
supply capacity and supply voltage variation and ensure that the
variation in voltage applied to the brake at conduction time is
within 90 Vrms ±10%.
Be sure to prepare and select the suitable input taps on the
primary side of the transformer according to the power supply
voltage, such as 100-110-120 VAC or 200-220-240 VAC.
(4) When the contact is set on the DC side (position shown in the
figure), the life of the contact is generally reduced due to a surge
voltage generated at brake-off time. Ensure that the contact has a
sufficient capacity. Moreover, use a surge absorber and spark
killer to protect the contact.
(5) The brake coil has no polarity. When making a brake coil
connection, the user need not be concerned with the positive and
negative poles of the power.
(6) Use a shielded cable as required.
The table below indicates the recommended components and
specifications of the brake circuit for the β series servo motor.
Item Stock number Manufacture Specification
FANUC
specification
Switch - -
Rated capacity
500 VAC, 5 A or more
-
Surge absorber ERZV20D221
Matsushita Electric
Industrial Co., Ltd.
Varistor voltage 220 V
Maximum allowable voltage 140 VAC
A06B-6050-K113
Spark killer S2-A-0
Okaya Electric
Industries Co., Ltd.
500Ω/0.2µF
Breakdown voltage 400 V or more
-
Rectifier D3SB60
Shindengen Electric
Manufacturing Co.,
Ltd.
Breakdown voltage 400 V or more
Maximum output current 2.3 A (with no fin)
A06B-6050-K112