Connection of stand-alone option units Wiring
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3.7 Connection of stand-alone option units
The inverter accepts a variety of stand-alone option units as required.
3.7.1 Magnetic contactors (MC)
Inverter input side magnetic contactor (MC)
On the inverter input side, it is recommended to provide an MC for the following purposes.
ā To release the inverter from the power supply when the fault occurs or when the drive is not
functioning (e.g. emergency stop operation). For example, MC avoids overheat or burnout of the
brake resistor when heat capacity of the resistor is insufficient or brake regenerative transistor is
damaged with short while connecting an optional brake resistor.
ā To prevent any accident due to an automatic restart at restoration of power after an inverter stop
made by a power failure.
ā To separate the inverter from the power supply to ensure safe maintenance and inspection work.
b
CAUTION:
Incorrect connection will cause inverter damage or accident. Connect and operate the option
unit carefully in accordance with the corresponding option unit manual.
NOTE Since repeated inrush currents at power on will shorten the life of the converter circuit (switching
life is about 1,000,000 times.), frequent starts and stops of the MC must be avoided. Turn on/off
the inverter start controlling terminals (STF, STR) to run/stop the inverter.
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