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Intelligent automatic bypass for a motor control device

  • US 7,558,031 B2
  • Filed: 04/30/2004
  • Issued: 07/07/2009
  • 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 an occurring fault and determining if said occurring fault is either a non-restricted fault or a restricted fault;

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

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

    said motor controller first opening said output contactor upon said fault identifying means determining the occurrence of either a non-restricted fault or a restricted fault and then closing said bypass contactor only when said fault identifying means determine the occurrence of a non-restricted fault.

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