6-8
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 GFCI (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 GFCI sensitivity.
Insert an MCCB or GFCI (with overcurrent protection) recommended for each inverter for its input
circuits. Do not use an MCCB or GFCI of a higher rating than that recommended.
Doing so could result in a fire.
Molded case circuit breaker/
ground-fault circuit interrupter
Magnetic contactor
Figure 6.2 External Views of Molded Case Circuit Breaker/Ground-Fault Circuit Interrupter, Magnetic Contactor
and Connection Example
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