11.3 Peripheral Equipment
11-15
Chapter 11 SELECTING PERIPHERAL EQUIPMENT
If a magnetic contactor (MC) is inserted in the inverter's output (secondary) side for switching the
motor to a commercial power or for any other purposes, it should be switched on and off when
both the inverter and motor are completely stopped. This prevents the contact point from getting
rough due to a switching arc of the MC. The MC should not be equipped with any main circuit
surge killer (Fuji SZ-ZM etc.).
Applying a commercial power to the inverter's output (secondary) side breaks the inverter. To
avoid it, interlock the MC on the motor's commercial power line with the one in the inverter output
circuit so that they are not switched ON at the same time.
2) Drive more than one motor selectively by a single inverter.
3) Selectively cut off the motor whose thermal overload relay or equivalent devices have been activated,
when driving multiple motors.
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 input RMS currents listed in Table 11.2-1, which are the most critical
RMS currents for using the inverter (Refer to Table 11.3-1). 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.
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