Inrush Currents At Power-On Of Main Circuit And Control Circuit - Mitsubishi Electric MELSERVO-J2-Super Series Supplementary Instructions Manual

5. CHARACTERISTICS
Use the dynamic brake at a load inertia moment ratio smaller than that shown in the table below.
If the value is exceeded, the dynamic brake may burn. If there is a possibility that the load inertia
moment may exceed the value, contact Mitsubishi.

5.4 Inrush currents at power-on of main circuit and control circuit

The following table indicates the inrush currents (reference value) that will flow when the maximum
permissible voltage (528VAC) is applied at the power supply capacity of 2500kVA and the wiring length of
1m.
Servo Amplifier
MR-J2S-60A4/B4
MR-J2S-100A4/B4
MR-J2S-200A4/B4
MR-J2S-350A4/B4
MR-J2S-500A4/B4
MR-J2S-700A4/B4
MR-J2S-11KA4/B4
MR-J2S-15KA4/B4
MR-J2S-22KA4/B4
Note. Control circuit power supply does not contain a inrush current restriction resistor. The value depends on the characteristics of
the connected 24VDC power supply.
Since large inrush currents flow in the power supplies, always use no-fuse breakers and magnetic
contactors. (Refer to section 6.2.2.)
When circuit protectors are used, it is recommended to use the inertia delay type that will not be tripped
by an inrush current.
Servo amplifier
MR-J2S-60A4/B4
MR-J2S-100A4/B4
MR-J2S-200A4/B4
MR-J2S-350A4/B4
MR-J2S-500A4/B4
MR-J2S-700A4/B4
MR-J2S-11KA4/B4
to
MR-J2S-22KA4/B4
Note. The value assumes that the external dynamic brake is used.
Main circuit power supply (L
57A (Attenuated to approx. 0A in 20ms)
65A (Attenuated to approx. 0A in 20ms)
60A (Attenuated to approx. 20A in 20ms)
325A (Attenuated to approx. 20A in 20ms)
Load inertia moment ratio [times]
30
16
15
(Note) 30
Inrush Currents (A -
0 P
, L , L ) Control circuit power supply (L
1 2 3
Depends on the connected power supply.
(Attenuated to approx. 0A in several ms)
5 - 4
)
11
(Note)
45A
, L )
21