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12. SERVO MOTOR
12.7.3 Electromagnetic brake
CAUTION
The electromagnetic brake is provided to prevent a drop at a power failure or servo
alarm occurrence during vertical drive or to hold a shaft at a stop. Do not use it for
normal braking (including braking at servo-lock).
Before operating the servo motor, be sure to confirm that the electromagnetic
brake operates properly.
The operation time of the electromagnetic brake varies depending on the power
supply circuit you use. Be sure to check the operation delay time with an actual
machine.
The characteristics of the electromagnetic brake provided for the servo motor with an electromagnetic brake
are indicated below.
Servo motor
Item
HG-KR series
053B
G1/G5/G7
13B
G1/G5/G7
23B
G1/G5/G7
43B
G1/G5/G7
Type (Note 1)
Spring actuated type safety brake
Rated voltage (Note 4)
24VDC
0
-10%
Power consumption
[W]at20
6.3
7.9
Coil resistance (Note 6)
[ ]
91.0
73.0
Inductance (Note 6)
[H]
0.15
0.18
Brake static friction torque
[N m]
0.32
1.3
Release delay time (Note 2)
[s]
0.03
0.03
Braking delay time (Note 2)
[s] DC off
0.01
0.02
Permissible braking work
Per braking
[J]
5.6
22
Per hour
[J]
56
220
Brake looseness at servo motor shaft (Note 5)
[degree]
2.5
1.2
Brake life (Note 3)
Number of
braking cycles
[times]
20000
Work per braking
[J]
5.6
22
Selection example of surge
absorbers to be used (Note 7, 8)
For the suppressed
voltage 125V
TND20V-680KB
For the suppressed
voltage 350V
TND10V-221KB
Note 1. It does not have a manual release mechanism. Use a 24 VDC power supply to release the brake electrically.
2. The value for initial on gap at 20 .
3. The brake gap will increase as the brake lining wears, but the gap is not adjustable.
The brake life indicated is the number of braking cycles after which adjustment will be required.
4. Be sure to prepare a power supply exclusively used for the electromagnetic brake.
5. These are design values. These are not guaranteed values.
6. These are measured values. These are not guaranteed values.
7. Select the electromagnetic brake control relay properly, considering the characteristics of the electromagnetic brake
and surge absorber. When a diode is used as surge absorber, the electromagnetic braking time will be longer.
8. Manufactured by Nippon Chemi-Con Corporation.
Summary of Contents for MELSERVO-JN Series
Page 31: ... 22 MEMO ...
Page 49: ...2 6 2 INSTALLATION MEMO ...
Page 181: ...5 30 5 DISPLAY AND OPERATION SECTIONS MEMO ...
Page 199: ...6 18 6 GENERAL GAIN ADJUSTMENT MEMO ...
Page 303: ...11 46 11 OPTIONS AND PERIPHERAL EQUIPMENT MEMO ...
Page 351: ...12 48 12 SERVO MOTOR MEMO ...
Page 445: ...13 94 13 POSITIONING MODE MEMO ...