Panasonic A4P Series Built-in Holding Brake, Connecting Example, Output Timing of BRK-OFF Signal

Built-in Holding Brake

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.

<Caution>

Use this built-in brake for "Holding" purpose only, that is to hold the stalling status. Never use this for "Brake" purpose to stop the load in motion.

Connecting Example

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

Relays to be shut off￿

	at emergency stop
Driver	Surge absorber
RY		Motor
36 BRK-OFF+	RY	Brake coil
12 to 24V VDC
17 COM–￿	Power supply ￿	Fuse￿
	for brake	(5A)

CN X5 DC24V

<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 (VDC).

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.

Output Timing of BRK-OFF Signal

•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.

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