Mitsubishi Electric Melservo MR-J3-100B, Handbook

Page: 243 / 590

Part 5: Review on Replacement of MR-J3-DU_ with MR-J4-DU_
5 - 48
6.3 Inrush currents at power-on of main circuit/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, always use molded-case circuit breakers and
magnetic contactors. (Refer to section 7.3.)
When circuit protectors are used, it is recommended that the inertia delay type, which is not tripped by an
inrush current, be used.
(1) MR-J3 series
The following table indicates the inrush currents (reference data) that will flow when the maximum
permissible voltage (200 V class: 253 VAC, 400 V class: 528 VAC) is applied at the power supply
capacity of 2500 kVA and the wiring length of 1 m.
Converter unit Drive unit
Inrush currents (A
0-P
)
Main circuit power supply (L
1
/L
2
/L
3
) Control circuit power supply (L
11
/L
21
)
MR-J3-CR55K
MR-J3-DU30K _
163 A
(Attenuated to approx. 20 A in 180 ms)
18 A
(Attenuated to approx. 0 A in 100 ms) MR-J3-DU37K
_
MR-J3-DU30K
_
4
339 A
(Attenuated to approx. 20 A in 70 ms)
19 A
(Attenuated to approx. 0 A in 60 ms)
MR-J3-CR55K4
MR-J3-DU37K _ 4
MR-J3-DU45K
_
4
MR-J3-DU55K
_
4
(2) MR-J4 series
The following table indicates the inrush currents (reference data) that will flow when the maximum
permissible voltage (200 V class: 240 VAC, 400 V class: 480 VAC) is applied at the power supply
capacity of 2500 kVA and the wiring length of 1 m.
Converter unit Drive unit
Inrush currents (A
0-P
)
Main circuit power supply (L1/L2/L3) Control circuit power supply (L11/L21)
MR-CR55K
MR-J4-DU30K_
154 A
(Attenuated to approx. 20 A in 150 ms)
31 A
(attenuated to approx. 2 A in 60 ms)
MR-J4-DU37K_
MR-CR55K4
MR-J4-DU30K_4
305 A
(attenuated to approx. 20 A in 70 ms)
27 A
(attenuated to approx. 2 A in 45 ms)
MR-J4-DU37K_4
MR-J4-DU45K_4
MR-J4-DU55K_4