Mitsubishi Electric MELSERVO-J3W Series Instruction Manual page 461

15. MR-J3W-0303BN6 SERVO AMPLIFIER
(2) 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 ratio is
higher than this value, the built-in dynamic brake may burn. If there is a possibility that the ratio may exceed
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 rotation
speed of the servo motor.
15.8.4 Inrush currents at power-on of main circuit and control circuit
The following shows inrush current (reference) when the maximum permissible voltage (main circuit: 55.2VDC,
control circuit: 26.4VDC) is applied on the conditions: main circuit power supply capacity; 48V/600W, control
circuit power supply capacity; 24V/100W, wiring length; 1m.
Since large inrush currents flow in the power supplies, always use circuit protectors.
For circuit protectors, it is recommended that the inertia delay type, which is not tripped by an inrush current, be
used.
Servo motor
series
HG-AK
Servo amplifier
Main circuit power supply (PM, 0)
MR-J3W-0303BN6 160A (attenuated to approx. 2A in 1ms)
Load to motor inertia ratio
[multiplier]
30
Inrush current
15 - 56
Control circuit power supply (24, 0)
1A (attenuated to approx. 0A in 30ms)