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System and method for fault contactor detection

  • US 7,130,170 B2
  • Filed: 02/25/2004
  • Issued: 10/31/2006
  • Est. Priority Date: 02/25/2004
  • Status: Active Grant
First Claim
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1. A motor controller system comprising:

  • power switches for connection to an AC line for controlling application of AC power to the motor;

    a fault contactor having contacts;

    a motor wiring circuit for operatively connecting the power switches and fault contactor contacts with motor winding terminals;

    voltage sensors for sensing AC line voltage and motor winding terminal voltage; and

    a control circuit for controlling operation of the switches and the fault contactor, including de-energizing the fault contactor in an off mode where AC line power is not supplied to the motor winding terminals, the control circuit measuring AC line voltage and motor winding terminal voltage in the off mode and detecting an error condition responsive to sensed AC line voltage being substantially different from motor winding terminal voltage in the off mode.

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