Brake Structure - Mitsubishi Electric GM-J2 Series Instruction Manual

8.

Brake Structure

1. Structure and operation
The brake structure is shown in the following figure. For all the models, the non-excitation
braking system (spring braking system) is adopted for the brake operation.
2. Brake specifications
The standard specifications for the brake are shown in the following table. (Standard specifications
for 100-V and 200-V type)
Brake model
BXM-04-10-A-76
BXM-04-10-A-77
BXM-05-10-A-18
BXM-05-10-A-19
* Notes 1 : The static friction torque is used for indication of the braking torque. The dynamic friction torque is approximately 80% of the
static friction torque.
2 : At the initial stage of motor operation, the specified braking torque may not be obtained. In this case, turn on and off the brake
with a light load as far as possible to adjust the friction surface.
3. Manual releasing method
Step 1 : Loosen the brake cover tightening screws (Item 1) (at 4 points), and then remove the brake
cover (Item 2). After that, remove the fan (Item 12).
Note that the snap ring (Item 11) is adopted to fix the fan.
Step 2 : Prepare the cross-recessed round head machine screws (M4 screws, 16 mm or more in
length), and then equally insert these screws in to the screw holes (at 2 points) of the
support plate (Item 8) to release the brake.
At the completion of work, be sure to remove the screws to reset the manually released brake.
Note: When manually releasing the brake, be sure to observe the following points:
• Be sure to check that the brake is properly released.
Basically, if the void is eliminated, you can judge that the brake is released. In addition, if
you can easily turn the motor shaft with your hand, you can judge that the brake is released.
• If the tightening force of the brake releasing screws is too large, the movable iron core or the
support plate may be distorted or flawed, and the brake may not operate properly.
• If the brake is manually released, do not operate the motor.
operation, be sure to check that the brake is not released and ready for operation.
Number of Braking power
Output
poles supply voltage
(W)
(P) (V)
100
25
200
4
100
40 - 90
200
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Braking
Braking voltage
current
(VDC)
(A)
45 0.156
90 0.078
45 0.2
90 0.1
－ 9 －
- 9 -
Description
Tightening screw
Brake cover
Power supply unit
Spacer
Shim
Cross-recessed round head
machine screw
Brake lining
Support plate
Movable iron core
Hub
Snap ring
Fan
Hexagon socket head bolt
Fixed iron core
Braking torque
Void (mm)
(N-m)
* Notes 1 and 2
Initial
0.15
0.29
(through)
0.3
0.5
(stop)
Before starting normal
Limit
0.57
0.55