AC70 VC CONTROL FREQUENCY INVERTER MANUAL
PERIPHERAL EQUIPMENTS AND OPTIONS
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7.3 Use of Peripheral Equipments
Chart 7-1:Peripheral equipments connection fig
Note:
Wiring breaker
To ensure wiring safe, protect power system and prevent malfunction expand to impact other equipment working while
short-circuit happens, and protect while over-load, please do use wiring breaker between power supply and main loop
power input terminals R,S,T.
: While choosing the breaker, the capacitance should be 1.5-2 times of the rated output current of the
frequency inverter. Please compare the time characteristic and protective time to the inverter (150% of the rated output
current, one minute). Make sure there will be no skip.
: Before main loop wiring, make sure to cut the breaker and electromagnetic contactor. Otherwise there is
danger of electric shock.
Leakage current breaker
The frequency inverter outputs peak voltage high-speed switch square wave. So there is high-frequency leakage
current. For earth protection to prevent electric shock and leakage current fire, please install leakage current breaker.
Usually, one set frequency inverter will bring 100mA leakage current (while the power cable length is 1m). If the length
prolongs 1m, there will be 5mA more leakage current. So please use leakage current breaker special for high frequency
leakage at the power input side of the frequency inverter. The factors which impact leakage current are as below:
Capacitance of inverter
Carrier frequency
Motor cable type and wire length