Motor protection inhibit circuit

Details Motor protection inhibit circuit Motor protection inhibit circuit

2007-04-24

2007-04-24

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S430000, C318S434000, C388S903000

Reexamination Certificate

active

11192650

ABSTRACT:
A circuit for inhibiting a protection device of a motor includes first, second, and third comparators and an inhibit signal generator. The first comparator is operable to determine if a motor current signal associated with the motor exceeds a starting threshold to identify a starting state of the motor. The second comparator is operable to determine if the motor current signal exceeds an inrush threshold to identify a transition from the starting state to an inrush state of the motor. The third comparator is operable to determine if the motor current signal falls below a running threshold to identify a transition from the inrush state to a running state of the motor. The inhibit signal generator is operable to deassert an inhibit signal for inhibiting the protection device responsive to the third comparator identifying the running state.

REFERENCES:
patent: 4636702 (1987-01-01), Hedges
patent: 4670697 (1987-06-01), Wrege et al.
patent: 4751450 (1988-06-01), Lorenz et al.
patent: 4782278 (1988-11-01), Bossi et al.
patent: 4800326 (1989-01-01), Unsworth
patent: 5436784 (1995-07-01), Schweitzer, III et al.
patent: 5719732 (1998-02-01), Nagahama et al.

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