6-14
Driving the motor using commercial power lines
MCs can also be used to switch the power source of the motor driven by the inverter to a commercial
power source.
Select the MC so as to satisfy the rated currents listed in Table 6.1, which are the most critical RMS
currents for using the inverter. For switching the motor drive source between the inverter output and
commercial power lines, use the MC of class AC3 specified by JIS C8325 in the commercial line side.
[ 1.2 ] Connection example and criteria for selection of circuit breakers
Figure 6.2 shows a connection example for MCCB or ELCB (with overcurrent protection) in the
inverter input circuit. Table 6.5 lists the rated current for the MCCB and corresponding inverter
models. Table 6.6 lists the applicable grades of ELCB sensitivity.
Insert an MCCB or ELCB (with overcurrent protection) recommended for each inverter for its input
circuits. Do not use an MCCB or ELCB of a higher rating than that recommended.
Doing so could result in a fire.
Molded case circuit breaker/
earth leakage circuit breaker
Magnetic contactor
Figure 6.2 External Views of Molded Case Circuit Breaker/Earth Leakage Circuit Breaker, Magnetic
Contactor and Connection Example
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