Mitsubishi Electric Melservo-Jet MR-JET Series User Manual page 52

Dynamic brake time constant
The following shows dynamic brake time constant  that is necessary to calculate the equation (5.2).
Servo motor
HG-KNS13_
HG-KNS23_
HG-KNS43_
HG-KNS73_
HG-SNS52_
HG-SNS102_
HG-SNS152_
HG-SNS202_
HG-SNS302_
Permissible load to motor inertia when the dynamic brake is used
Use the dynamic brake under the load to motor inertia ratio indicated in the following table. If the ratio is higher than this value,
the dynamic brake may burn. If the ratio exceeds the value, contact your local sales office.
The values of the permissible load to motor inertia ratio in the table are the values at the maximum speed of the servo motor.
Servo motor
HG-KNS13_
HG-KNS23_
HG-KNS43_
HG-KNS73_
HG-SNS52_
HG-SNS102_
HG-SNS152_
HG-SNS202_
HG-SNS302_
5 CHARACTERISTICS
50
5.3 Dynamic brake characteristics
Waveform
60
50
40
30
20
10
0
0 1000 2000 3000 4000 5000 6000
Speed [r/min]
200
180
160
140
102
120
100
80
60
202
40
20
0
0 500 1000 1500 2000 2500 3000
Speed [r/min]
Permissible load to motor inertia ratio [multiplier]
30
24
16
73
23
43
13
52
302
152