Mitsubishi Electric MELDAS MDS-R Series Technical Specification And Instruction Manual page 56

(3) Magnetic brake power supply
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
CAUTION
(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.
3. Characteristics
plug pins could be damaged by sparks.
24VDC
ZD1
100VAC or
PS
200VAC
VAR1
ZD2
(b) Example of DC OFF
PS : 24VDC stabilized power supply
ZD1, ZD2 : Zener diode for power supply protection (1W, 24V)
: Surge absorber
VAR1, VAR2
Magnetic brake circuits
3 - 10
SW2
SW1
VAR2