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Thanks for the valuable replies.
As per your advice I connected earth wire
Negative to frame the problem almost solved. But I can 't see any componants which is change to low voltage input.
I used IRF740 mosfet for switching the out put stage.
I have completed A 3 phase Induction motor speed controller (AN 843 microchip) as standard 3 phase input power supply (440 Volt)
Here I ask to you , is it possible to work with 200 volt Input ? I have tried to apply 200 volt input motor (motor also 200 volt) working
fine in forward direction...
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