The inverter no-load current is greater than the load current

A 75 kw micro can WIN - G9 inverter commissioning the strange phenomenon.In the process of commissioning,occasionally with current clip-on table test about the three phase output current of frequency converter,more found an amazing phenomenon! The station frequency converter input and output current is completely out of proportion,there is a difference of more than 10 times! 40 electrical motor a current in the output,the input current for several amperes,hardly measured;In 100 a current output,measured input current is only 8 a here! Strange ah,do not conform to the law of conservation of energy.100 a output current change out from?!Like a leaky pipe,into the water,1 and motor run capacitor out 10 water,ShuiGuanZi cannot change water inside.As we all know,in general,the inverter input current is always less than the output current.

The reason for the dc circuit of energy storage capacitor,as if on the motor end installed a ark of reactive power compensation.When inverter no load or light load,part electricalmotor1.blogspot.com is provided by energy storage capacitor current to the load,reduce inverter current from the power grid.And as the increase of load,the input current in proportion to increase,when input rated load,frequency converter input current and output current should be nearly equal.Such as when the output of 40 year input took only a few amp;Output is 100 a,the input current has amounted to 70 a.The output current of 140 a,the ac induction motor input current is almost reached this value.Under normal circumstances,there are differences between the input and output current,but won't produce differences such as the aforementioned gaps.Huge difference made me wonder if measuring instrument is broken.In the table,measure it again,still same result.