The Graph Of Overload Protection Characteristics Of Rotary Servo Motor; Characteristics Of Electromagnetic Brake - Mitsubishi Electric MR-J5-HK-KT Series User Manual

8.3
The graph of overload protection characteristics
of rotary servo motor
Overload protection of rotary servo motors has been enhanced for MR-J5 servo amplifiers with firmware version A7 or later.
Refer to "Overload protection characteristics" in the following manual.
MR-J5 User's Manual (Hardware)
8.4

Characteristics of electromagnetic brake

Before operating the servo motor, confirm that the electromagnetic brake operates properly.
The operation time of the electromagnetic brake varies depending on the power supply circuit being used.
Check the operation delay time with an actual machine.
The characteristics of the electromagnetic brake provided for the rotary servo motor with an electromagnetic brake are shown
below.
Item
*1
Type
*4
Rated voltage
Power consumption at 20 °C [W]
*5
Coil resistance [Ω]
*5
Inductance [H]
Brake static friction torque
*2
Release delay time [s]
Braking delay time [s]
Permissible braking
work
Brake looseness at servo motor shaft
*3
Brake life
Selection example of
surge absorbers to be
*6
used
*1 This type 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 Brake lining wear due to braking will increase the brake gap, but the gap is not adjustable. Therefore, the brake life indicates the number
of times the brake can be applied before gap adjustment becomes necessary.
*4 Prepare a power supply exclusively for the electromagnetic brake.
*5 The values are design values. These are not the guaranteed values.
*6 Select the electromagnetic brake control relay properly, in consideration of the characteristics of the electromagnetic brake and surge
absorber. When a diode is used as a surge absorber, the electromagnetic braking time becomes longer.
*7 The value of the brake static friction torque is the lower limit in the initial state at 20 °C.
8 HK-ST SERIES
182

8.3 The graph of overload protection characteristics of rotary servo motor

HK-ST52(4)WB
HK-ST102(4)WB
HK-ST172(4)WB
Spring actuated type safety brake
24 V DC (-10 % to 0 %)
20
29
0.05
*7
[N•m] 8.5 or more
0.04
*2
DC off 0.03
Per braking [J] 400
Per hour [J] 4000
*5
[degree] 0.2 to 0.6
Number of braking times 20000
[times]
Work per braking [J] 200
For the suppressed TND20V-680KB (Manufactured by NIPPON CHEMI-CON CORPORATION)
voltage 125 V
For the suppressed TND10V-221KB (Manufactured by NIPPON CHEMI-CON CORPORATION)
voltage 350 V
HK-ST202(4)AWB HK-ST7M2UW
HK-ST302(4)WB HK-ST172UW
23 20
25 29
0.25 0.9
16 or more 8.5 or more
0.12 0.04
0.03 0.03
400 400
4000 4000
0.01 to 0.6 0.6 or less
5000 20000
400 200
HK-ST202(4)WB
HK-ST352(4)WB
HK-ST502(4)WB
HK-ST702(4)WB
34
17
0.06
44 or more
0.1
0.03
4500
45000
0.2 to 0.6
20000
1000