Panasonic MINAS E-series - Manual (Page 35)

35
[Preparations]
Preparations
The brake is to hold a work (movable part) and prevent it from dropping by gravity when power to the servo is shut
off for the purpose of driving a vertical shaft in the servo motor.
<Caution>
<Remarks and Cautions>
1. A brake coil has no polarity.
2. A customer is requested to provide for power supply for the brake. In addition, do not use power supply for
control signals (V
DC
) for driving the brake.
3. In order to suppress surge voltage due to ON/OFF operation of the relay (RY), install a surge absorber. When
you’re using a diode in place of a surge absorber, note that start of the servo motor is delayed in comparison with
when the latter is used.
4. For a surge absorber for the brake, refer to “Recommended Parts” on Page 192 of Reference edition.
5. The recommended parts are those specified for measuring brake release time. In some cases, reactance of
electric wires may vary depending on wire length, causing sporadic rise of voltage. Select a surge absorber so
that the relay coil voltage (maximum rating: 30V, 50 mA) and voltage between brake terminals do not exceed a
rated value.
BRK-OFF Signal Output Timing
• For timing of brake release upon power-on or that of brake operations in case of servo-off/alarm while the motor
is rotating, refer to “Timing Chart” on Page 32.
• In case of Servo-OFF or alarm while the motor is rotating, you can set with the parameter (i.e., Pr6B: Mech.
break action set-up at motor in motion) time till BRK-OFF signal turns off (i.e., the brake is actuated) after the
motor is freed from energized state. For details, refer to “Parameter Settings” of every control mode.
<Remarks>
1. The servo motor with built-in brake could result in brake lining sound (Chattering, etc.) while it is running. But this
is not a problem.
2. When the current is fed into the brake coil (with the brake kept released), it could result in leak magnetic flux from
the shaft, etc. Be careful when a magnetic sensor, etc. are used around the motor.
Wiring (Example)
This circut shows an example
in which a brake release (BRK-OFF)
signal from the driver is used to
control the brake.
The brake built in the servo motor is only for holding, namely, maintaining,
stopped condition. Thus, you must not use it for “braking” to stop moving load.
Driver
Surge absober
Cut off upon emergency stop
Motor
Brake coil BRK-OFF
11
13
RY
COM-
V DC
RY
12~24V
Power for brake
DC24V
CN X5
Fuse
(5A)
Holding Brake
Specifications of Holding Brake
• Excitation voltage should be DC24V
± 10%.
*1 A value when the surge absorber is used.
Values given in ( ) are actual values measured with diodes (V03C manufactured by HITACHI Semiconductor
and Devices Sales Co., Ltd.).
• The values in the above table are representative characteristics (except static friction torque, releasing voltage,
and excitation current).
• A backlash of the brake is
± 1˚ of a setup value.
• Allowable angular acceleration of MUMA series: …..10000 rad/s 2
• Service life of the number of accelerations/decelerations with the allowable angular acceleration is 10 million
times or greater. (The number of accelerations/decelerations till backlash of the brake changes drastically.)
Motor
Series
MUMA
Motor Output
50W, 100W
200W, 400W
Static Friction
Torque (N/m)
0.29 or higher
1.27 or higher
Inertia
x 10 -4
kg•m 2
0.003
0.03
Intake Time
(ms)
25 or shorter
50 or shorter
Release Time
(ms)
*1
20 or
shorter(30)
15 or shorter
(100)
Excitation
Current DC A
(during cooling)
0.26
0.36
Release
Voltage
DC1V or
higher
Allowable
Workload per
Braking J
39.2
137
Total
Allowable
Workload
x 10 3 J
4.9
44.1