Panasonic A4P Series User Manual

50

Driver

Surge absorber

Relays to be shut off

at emergency stop

Motor

Brake coil

BRK-OFF+

36

17

RY

COM–

V

DC

RY

12 to 24V

Power supply 

for brake

DC24V

CN X5

Fuse

(5A)

In the applications where the motor drives the vertical axis, this brake would be used to hold and prevent the
work (moving load) from falling by gravity while the power to the servo is shut off.

<Notes, Cautions>
1. The brake coil has no polarity.
2. Power supply for the brake to be provided by customer. Do not co-use the power supply for the brake and

for the control signals (V

DC

).

3. Install a surge absorber as the above Fig. shows to suppress surge voltage generated by ON/OFF action

of the relay (RY). When you use a diode, note that the time from the brake release to brake engagement
is slower than that of the case of using  a surge absorber.

4. For a surge absorber, refer to P.191, "Recommended Components"of Supplement.
5. Recommended components are specified to measure the brake releasing time.

Reactance of the cable varies depending on the cable length, and it might generate surge voltage.
Select a surge absorber so that relay coil voltage (max. rating : 30V, 50mA) and terminal voltage may not
exceed the rating.

 • For the brake release timing at power-on, or braking timing at Servo-OFF/Servo-Alarm while the motor is

in motion, refer to P.133, 135, "Timing Chart".

 • With the parameter, SV.Pr6B (Setup of mechanical brake action while the motor is in motion), you can set

up a time between when the motor enters to a free-run  from energized status and when BRK-OFF signal
turns off (brake will be engaged), when the Servo-OFF or alarm occurs while the motor is in motion.

<Notes>
1. The lining sound of the brake (chattering and etc.) might be generated while running the motor with built-

in brake, however this does not affect any functionality.

2. Magnetic flux might be generated through the motor shaft while the brake coil is energized (brake is

open). Pay an extra attention when magnetic sensors are used nearby the motor.

The following shows the example when the brake is controlled by using the brake release output signal
(BRK-OFF) of the driver.