Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 514

Permissible load to motor inertia ratio when the dynamic brake is used
Use the dynamic brake under the load to motor inertia ratio indicated in the following table. If the load to motor inertia ratio is
higher than this value, the dynamic brake may burn. If the load to motor inertia ratio exceeds the indicated 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 rotation speed of the direct
drive motor.
The value in the parenthesis shows the value at the rated speed of the direct drive motor.
Direct drive motor
TM-RFM_C20
TM-RFM_E20
TM-RG2M002C30
TM-RU2M002C30
TM-RFM_G20
TM-RFM_J10
TM-RG2M_E30
TM-RG2M_G30
TM-RU2M_E30
TM-RU2M_G30
15 USING A DIRECT DRIVE MOTOR
512
15.4 Characteristics
Permissible load to motor inertia ratio [multiplier]
100 (300)
50 (300)
50 (200)
20 (80)