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Before attempting to connect or disconnect any wiring, ensure that the inverter's CHARGE
lamp is not lit.
Do not install power factor improvement capacitors in the VF-A3's output circuits.
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As a rule, install a magnetic contactor between the inverter and the motor.
However, do not use the contactor to switch power to the inverter off or on during a run. This
is because any opening or closing of the secondary circuit during a run will cause a large
in-rush current to the inverter, which could damage it and other equipment.
While the inverter's output is shut off completely, you can connect a magnetic contactor in the
circuit between the inverter and the motor when the mtor is switched to an another motor, or
when switching to a commercial power supply. Additionally, establish an interlock so as to
prevent the erroneous application of commercial power to the inverter's output terminals:
Exercise maximum caution when connecting power input lines to the inverter's L1(R),L2(S)
and L3(T)
terminals. Miswiring of power input lines could damage the inverter's circuits and
components.
·8.2.3 Between the inverter and the regenerative discharge reSistor/regenerative discharge unit
Install wiring so that the connections between the inverter and the regenerative discharge resistor/
regenerative discharge unit use the shortest possible wires. Use twisted-pair wires for these
connections.
Further, to improve the cooling, the regenerative discharge reSistor/regenerative
discharge unit should not be directly attached to the inverter, but installed nearby.
If you use a regenerative discharge resistor/regenerative discharge unit, install a magnetic
contactor (MC) or a molded-case circuit breaker (MCCB) equipped with a trip coil on the inverter'
s power supply end. This is necessary to allow the power supply circuit to open at the activation
of the built-in fault detection relay (FL) or an externally installed overload relay (THRY).
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