Yaskawa AC Servo Drive Rotary Servomotor Safety Precautions - Manual (Page 28)

1 Product Handling Precautions
E-26
Using a Holding Brake
The holding brake is designed to hold the motor in place. Do not use it to
stop the motor. If you use the holding brake to stop the motor, the holding
brake or encoder may be damaged. Before you operate a Servomotor,
supply power to the holding brake to release the holding brake. Refer to
the timing charts in the manual for details.
• Two different power supply voltages are available for the holding brake:
24 VDC and 90 VDC.
Select the brake power supply according to the power supply voltage
and capacity required for the Servomotor model, as given in the manual
and product catalog.
Also confirm the input voltage to the holding brake.
• Always install a surge absorber in a protective circuit between the brake
power supply and Servomotor. The time required for a holding brake to
operate depends on the types of protective circuits.
Always check the time required for a holding brake to operate on the
actual machine before you operate a Servomotor.
Conditions Often Misidentified as Failures
‹ Heating of Servomotors with Holding Brakes
The following condition does not indicate a failure in the Servomotor.
Even if the servo is OFF, the power supply to the holding brake that
releases the holding brake will cause the Servomotor to heat.
A
A: Brake power supply
B: Protective circuit
B
A
A: Brake power supply