H - Electricity – 02 – H
Patent
H - Electricity
02
H
318/108
H02H 7/08 (2006.01)
Patent
CA 1281068
-13- Abstract of the Disclosure Fault Protection Apparatus For Traction Motor Circuit Motor control circuits having fault protection devices are in commerical use today. Such devices typically include logic elements requiring a conditioned power supply, and are incapable of operation directly from the main motor power supply. The subject apparatus includes a timing circuit for monitoring the electrical conduction of a power switching element associated with an electrical motor. The apparatus produces a fault signal in response to the power switching element continuing to conduct for longer than a predetermined continuous period of time. A latch receives the fault signal and responsively produces a blocking signal. An interrupt circuit receives the blocking signal and responsively controllably blocks power from the motor power supply to the electrical motor. Each of the timing, latch, and interrupt circuits is adapted to operate directly from the motor power supply and independent of any intermediate logic power supplies or associated logic devices.
535975
Caterpillar Industrial Inc.
Kirby Eades Gale Baker
LandOfFree
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