Electromagnetic contactor tandem control system for thermal prot

Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits

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361103, 364483, 34082506, H02H 504

Patent

active

048191183

ABSTRACT:
A bidirectional motor has two electromagnetic contactors, one for forward, the other for reverse operation. Thermal protection is provided by a thermal image generator and a thermal protection unit in each contactor operating in tandem via a bidirectional line of communication keeping the thermal images in parallelism by one active contactor "talking" to the inactive contactor, the "listener".

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Instructions for A210, A250, Size 3 or 4 Reversing Motor Controller (I. L. 15466B Model J, Westinghouse Electric Corporation Control Division, Asheville, N.C. 28813, United States of America 4-1984.

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