Sb1234 Posted August 22, 2008 Report Share Posted August 22, 2008 I am dealing with design of a hoist motor( 3 phase induction motor ) control circuit.The supply of the braking rectifier is taken between one motor phase and motor neutral point .( star connected motor) . The hoist vendor tells me that in case of sudden loss of power when the hoist is lowering the load (regenerative mode) the regenerated voltage will provide supply to the braking rectifier which will cause delay in holding of brake(brake engages when supply is not available to brake coil). He advises me to put a contactor to cut off the brake power supply when main power fails. Is the regenerated energy so significant that I need to isolate the brake with a contactor to prevent regenerated feed .( the motor is of 9.5Kw ) . any advise is welcome . Regards Link to comment Share on other sites More sharing options...
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