6 CHARACTERISTICS
6.3 Inrush currents at power-on of main circuit and control circuit
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6
6.3
Inrush currents at power-on of main circuit and
control circuit
A molded-case circuit breaker and magnetic contactor may fail or malfunction due to an inrush current flowing through the
converter units power lines (input lines) at power-on. Therefore, use products with the specifications described on the
following page.
Page 93 Molded-case circuit breakers, fuses, magnetic contactors
When circuit protectors are used, it is recommended that the inertia delay type, which is not tripped by an inrush current, be
used.
200 V class
The following shows the inrush currents (reference data) that will flow when 240 V AC is applied with a wiring length of 1 m.
400 V class
The following shows the inrush current (reference data) that will flow when 480 V AC is applied with a wiring length of 1 m.
Converter unit
Inrush currents (A
0-P
)
Main circuit power supply (L1/L2/L3)
Control circuit power supply (L11/L21)
MR-CV11K
38 A (attenuated to approx. 10 A in 45 ms)
23 A (attenuated to approx. 2 A in 5 ms)
MR-CV18K
38 A (attenuated to approx. 10 A in 70 ms)
MR-CV30K
81 A (attenuated to approx. 20 A in 65 ms)
MR-CV37K
MR-CV45K
81 A (attenuated to approx. 20 A in 86 ms)
MR-CV55K
57 A (attenuated to approx. 20 A in 137 ms)
Converter unit
Inrush currents (A
0-P
)
Main circuit power supply (L1/L2/L3)
Control circuit power supply (L11/L21)
MR-CV11K4
24 A (attenuated to approx. 10 A in 22 ms)
15 A (attenuated to approx. 2 A in 5 ms)
MR-CV18K4
24 A (attenuated to approx. 10 A in 35 ms)
MR-CV30K4
48 A (attenuated to approx. 20 A in 35 ms)
MR-CV37K4
MR-CV45K4
48 A (attenuated to approx. 20 A in 45 ms)
MR-CV55K4
MR-CV75K4
42 A (attenuated to approx. 20 A in 66 ms)
15 A (attenuated to approx. 2 A in 7 ms)
