Nuisance trip reducing motor control system and method

Details Nuisance trip reducing motor control system and method Nuisance trip reducing motor control system and method

2004-09-30

2008-12-09

Leja, Ronald W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

Reexamination Certificate

active

07463462

ABSTRACT:
A technique for reducing nuisance tripping is disclosed in which a desired limit temperature is determined for a component of a motor system. The limit is compared to actual temperature signals, or signals indicative of temperature of the component. The component may be the conductor or conductors providing power to the motor. A counter is augmented when the actual temperature exceeds the limit. The limit may be computed, such as based on a heating model. A trip signal is generated only when the actual temperature has exceeded the limit for a predetermined number of periods. The counter may be reset if the actual temperature drops below the desired limit.

REFERENCES:
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patent: 4413213 (1983-11-01), Baumgarten, Jr.
patent: 4544982 (1985-10-01), Boothman et al.
patent: 4812943 (1989-03-01), Jones et al.
patent: 5418677 (1995-05-01), Engel
patent: 5852351 (1998-12-01), Canada et al.

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