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Intelligent automatic bypass for a motor control device fault

  • US 20040252423A1
  • Filed: 04/30/2004
  • Published: 12/16/2004
  • Est. Priority Date: 05/02/2003
  • Status: Active Grant
First Claim
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1. A system for controlling an AC motor comprising:

  • a motor controller comprising a motor control device and means for identifying a fault occurring in said motor control device and determining if said occurring fault is a restricted fault;

    an output contactor connected between said motor control device and said motor, said output contactor closed in the absence of any fault in said motor control device; and

    a bypass contactor connected between a source of AC power, said motor control device and said AC motor, said bypass contactor open in the absence of any fault occurring in said motor control device;

    said motor controller opening said output contactor upon said fault identifying means determining the occurrence of a restricted fault in said motor control device.

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