Fuji Electric FRENIC-HVAC User Manual page 122

Driving the motor using commercial power lines
MCs can also be used to switch the power supply of the motor driven by the inverter to a commercial
power supply.
Select the MC so as to satisfy the rated currents listed in Table 4.1, which are the most critical RMS
currents for using the inverter. (Refer to Table 4.4.)
[ 2 ] Connection example and criteria for selection of circuit breakers
Figure 4.2 shows a connection example for MCCB or RCD/ELCB (with overcurrent protection) and
MC in the inverter input circuit. Table 4.4 lists the rated current for the MCCB and corresponding
inverter models. Table 4.5 lists the applicable grades of RCD/ELCB sensitivity.
Insert an MCCB or RCD/ELCB (with overcurrent protection) recommended for each inverter for its
input circuits. Do not use an MCCB or RCD/ELCB of a higher rating than that recommended.
Doing so could result in a fire.
Molded case circuit breaker or
residual-current-operated protective device/
earth leakage circuit breaker
Three-phase
power supply
200 to 240 V
50/60 Hz
or
Three-phase
power supply
380 to 480 V
50/60 Hz
*
With overcurrent protection
Figure 4.2 External Views of MCCB or RCD/ELCB and MC and Connection Example
Molded case circuit breaker
(MCCB)
or
residual-current-operated
protection device (RCD)/
earth leakage circuit breaker
(ELCB)*
T1 L1
L2
T2
T3
L3
4-6
Magnetic contactor
Magnetic contactor
(MC)
L1
T1
T2 L2
T3 L3
Inverter
L1/R
L2/S
L3/T