Motor protection circuit

Details Motor protection circuit Motor protection circuit

1979-09-11

1982-10-12

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 92, H02H 708

Patent

active

043542140

ABSTRACT:
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 prevents interruption of the holding circuit until conditions on the motor side of the contacts have been established and sensed for operation, proper or otherwise, during motor start up.

REFERENCES:
patent: 2724782 (1955-11-01), Holloway
patent: 3317741 (1967-05-01), McClain
patent: 3636541 (1972-01-01), Genuit et al.

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