Mitsubishi Electric MR-J4, Instruction Manual

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18. MR-J4-03A6 SERVO AMPLIFIER
18 - 78
(2) 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 servo amplifier 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.
Servo motor
Permissible load to motor
inertia ratio [multiplier]
HG-AK0136
HG-AK0236 30
HG-AK0336
18.7.4 Inrush currents at power-on of main circuit and control circuit
POINT
The inrush current values can change depending on frequency of turning on/off
the power and ambient temperature.
Since large inrush currents flow in the power supplies, use circuit protector. For circuit protectors, it is
recommended that the inertia delay type, which is not tripped by an inrush current, be used. Refer to section
18.8.4 for details of the circuit protector.
This following table indicates the inrush current (reference data) when the power of output side of power unit
is turned on in the conditions: main circuit of 55.2 V DC, control circuit of 26.4 V DC, and wiring length of 1m.
Servo amplifier
Inrush current
Main circuit power supply (PM/0) Control circuit power supply (24/0)
MR-J4-03A6 70 A (attenuated to approx. 0 A in 1 ms) 0.5 A (attenuated to approx. 0 A in 60 ms)