Inrush Current When Turning On The Main Circuit/Control Circuit Power Supply - Mitsubishi Electric MELSERVO-J2S Series Transition Handbook

Part 5: Review on Replacement of MR-J2S-30 kW or Higher Capacity Models with MR-J4-DU_

4.2 Inrush Current When Turning On the Main Circuit/Control Circuit Power Supply

An inrush current flow in the units at power-on. Use a molded-case circuit breaker and a magnetic contactor
to protect the units from the inrush current. (Refer to Section 5.3)
When using a circuit protector, it is recommended that you use an inertia delay type which will not be tripped
by the inrush current.
When the converter unit and drive unit are connected by daisy chain, the total inrush current of the both units
flows in.
1) MR-J2S series inrush current when turning on the main circuit/control circuit power supply
The table below shows inrush currents (references) when the maximum permissible voltage (200 V AC
class: 253 V AC, 400 V AC class: 528 V AC) is applied. The power supply capacity is 2500 kVA and the
wiring length is 1 m.
Converter unit Servo amplifier
MR-J2S-30K_
MR-HP30KA
MR-J2S-37K_
MR-J2S-30K_4
MR-J2S-37K_4
MR-HP55KA4
MR-J2S-45K_4
MR-J2S-55K_4
2) MR-J4 series inrush current when turning on the main circuit/control circuit power supply
The table below shows inrush currents (references) when the maximum permissible voltage (200 V AC
class: 240 V AC, 400 V AC class: 480 V AC) is applied. The power supply capacity is 2500 kVA and the
wiring length is 1 m.
Converter unit Servo amplifier
MR-J4-DU30K_
MR-CR55K
MR-J4-DU37K_
MR-J4-DU30K_4
MR-J4-DU37K_4
MR-CR55K4
MR-J4-DU45K_4
MR-J4-DU55K_4
POINT
Inrush current values are changeable depending on the frequency of turning
on/off the power supplies and ambient temperature.
Main circuit power supply (L
(Attenuates to approximately 20 A in 160 ms)
(Attenuates to approximately 20 A in 80 ms)
(Attenuates to approximately 20 A in 100 ms)
(Attenuates to approximately 20 A in 100 ms)
Main circuit power supply (L
(Attenuates to approximately 20 A in 150 ms)
(Attenuates to approximately 20 A in 70 ms)
Inrush current (A
/L /L )
1 2 3
270 A
(Attenuates to approximately 0 A in 200 ms)
554 A
555 A
(Attenuates to approximately 0 A in 150 ms)
556 A
Inrush current (A
/L /L )
1 2 3
154 A
305 A
5 - 31
)
0-P
Control circuit power supply (L
7 A
15 A
)
0-P
Control circuit power supply (L
31 A
(Attenuates to approximately 2 A in 60 ms)
27 A
(Attenuates to approximately 2 A in 45 ms)
/L )
11 21
/L )
11 21