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- App. 6 -
Holding brake
The brake is to hold the work (movable part coupled to a vertical motor axis) to prevent it from
falling by gravity in case the servo power is lost.
<Notes and Cautions>
1. The brake coil has no polarities.
2. The power supply for the brake should be supplied by the customer. Do not use the control
power (VDC) for driving the brake.
3. Install a surge absorber per the figure above in order to suppress the surge voltage due to
the on/off operation of the relay (RY). If you use a diode for surge absorber, note that the
start of the servo motor after releasing the brake is delayed.
4. Use the recommended surge absorber. See Recommended Parts in page appendix 47.
5. Recommended parts are those specified for measurement of the brake releasing time.
They are not provided with sufficient measures to prevent noise. Reactance of the cable
varies with the wiring length, possibly resulting in jump-up of the voltage in some cases.
Select a surge absorber so that the coil voltage of the relay may be suppressed to (Max.
rating: 30V, 50mA max.) and the terminal-to-terminal voltage of the brake to (Max. rating:
30V, 50mA max.).
BRK-OFF
11
13
RY
COM
-
V
DC
RY
12~24V
24VDC
(5A)
CN /
F
I
Amplifier
Surge absorber
Motor
Brake coil
Fuse
Power for brake
Wiring (Example)
This circuit shows a function of controlling the brake using the brake release signal (BRK-
OFF) from the amplifier.
<Caution>
The holding brake is to hold the work, not stop its motion. Never
use the brake for decelerating and stopping the machine.