Motor protection circuit

Details Motor protection circuit Motor protection circuit

H - Electricity

02

H

318/86

H02H 7/09 (2006.01)

Patent

CA 1175102

ABSTRACT OF THE INVENTION A protection circuit for multi-phase motors provides circuits for protecting a motor against low voltage, phase reversal or loss of a phase and other improper operating conditions on both the line side and the motor side of the main motor contactors. The line and motor side circuits are interrelated such that an unsafe condition on either side of the contactors causes the contactors to be opened. A time delay circuit on the motor side of the contactors pre- vents interruption of the holding circuit until conditions on the motor side of the contacts have been established and sensed for opera- tion, proper or otherwise, during motor start up.

359582

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