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3. Characteristics
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(3) Magnetic brake power supply
CAUTION
1. Always install a surge absorber on the brake terminal when using DC OFF.
2. Do not pull out the cannon plug while the brake power is ON. The cannon
plug pins could be damaged by sparks.
(a) Brake excitation power supply
1) Prepare a brake excitation power supply that can accurately ensure the attraction current
in consideration of the voltage fluctuation and excitation coil temperature.
2) The brake terminal polarity is arbitrary. Make sure not to mistake the terminals with other
circuits.
(b) Brake excitation circuit
1) AC OFF and 2) DC OFF can be used to turn OFF the brake excitation power supply (to apply
the brake).
1) AC OFF
The braking delay time will be longer, but the excitation circuit will be simple, and the relay
cut off capacity can be decreased.
2) DC OFF
The braking delay time can be shortened, but a surge absorber will be required and the
relay cut off capacity will be increased.
<Cautions>
Provide sufficient DC cut off capacity at the contact.
Always use a surge absorber.
(b) Example of DC OFF
24VDC
PS
SW2
VAR2
SW1
VAR1
Magnetic brake 1
ZD1
ZD2
100VAC or
200VAC
Magnetic brake 2
PS
ZD1, ZD2
VAR1, VAR2
: 24VDC stabilized power supply
: Zener diode for power supply protection (1W, 24V)
: Surge absorber
Magnetic brake circuits