Built-In Holding Brake - Panasonic MINAS A6N Series Operating Instructions Manual

2
Preparation
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.
Max.30 V
The External brake release signal can be assigned by default setting of SO1(X4:1, 2 Pin).
Note
1. The brake coil has no polarity.
2. Power supply for the brake to be provided by customer. Do not co-use the power sup-
Caution
ply for the brake and for the control signals (VDC).
3. Install a surge absorber as the above Fig. shows to suppress surge voltage gener-
ated 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.7-106, "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 : 30 V, 50 mA) and ter-
minal voltage may not exceed the rating.
6. The current flowing to SO terminal should be rated current 40 mA, maximum current
50 mA, inrush current 90 mA.
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.7-62, "Timing Chart".
• With the parameter, Pr4.38 (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 en-
ergized 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. The details refer to P.3-73.
1. The lining sound of the brake (chattering and etc.) might be generated while running
Note
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 ener-
gized (brake is open). Pay an extra attention when magnetic sensors are used nearby
the motor.
Rev.2.00

11. Built-in Holding Brake

Outline
Driver
BRK-OFF+
1
10
12 V to 24 V
BRK-OFF–
2
Connector X4
Relays to be shut off
at emergency stop
RY
RY
Surge
V
DC
absorber
Power supply
for brake
DC24 V
Motor
Brake coil
Fuse
(10 A)
2-65
1
2
3
4
5
6
7