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why contactor not provided between output of VFD and motor?
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Answer Posted / nandan d shanbhag
Due to electromechanical bouncing of the contactor
contacts , voltage spikes are generated which in turn will
result in failure of smiconductors in the drive. However
due to eletrical regulaton if contactor needs to be
provided for electrical isolation then there must be delay
of 1 sec before starting the inverter after contactor is on
and contactor should be made of atleast .5 second after the
inverter is made off.
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