Mitsubishi HG-SR Outboard Motor User Manual


 
11. HG-AK SERIES
11 - 5
11.4 Electromagnetic brake characteristics
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 a real
machine.
The characteristics of the electromagnetic brake provided for the servo motor with an electromagnetic brake
are indicated below.
Servo motor
Item
HG-AK series
0136B 0236B 0336B
Type (Note 1) Spring-loaded safety brake
Rated voltage (Note 4)
24 V DC
0
-10%
Power consumption [W] at20 °C 1.8
Coil resistance (Note 6) [] at20 °C 320
Inductance (Note 6) [H] 1.6
Brake static friction torque [N•m] 0.095
Release delay time (Note 2) [s] 0.03
Braking delay time (Note 2) [s] DC off 0.01
Permissible braking work
Per braking [J] 4.6
Per hour [J] 46
Brake looseness at servo motor shaft (Note 5) [degree] 0.1 to 2.5
Brake life (Note 3)
Number of brakings [times] 20000
Work per braking [J] 1
Selection example of surge
absorbers to be used (Note 7, 8)
For the suppressed voltage
125 V
TND20V-680KB
For the suppressed voltage
350 V
TND10V-221KB
Note 1. It does not have a manual release mechanism. Use a 24 V DC power supply to release the brake electrically.
2. The value for initial on gap at 20 °C.
3. The brake gap will increase as the brake lining wears, but the gap is not adjustable. The brake life is defined as the
number of brakings until adjustment will be required.
4.
A
lways 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 you use a diode for a surge absorber, the electromagnetic braking time will be longer.
8. Manufactured by Nippon Chemi-Con Corporation.