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Elevator safety circuit monitor and control for drive and brake

  • US 6,056,088 A
  • Filed: 09/21/1998
  • Issued: 05/02/2000
  • Est. Priority Date: 09/22/1997
  • Status: Expired due to Fees
First Claim
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1. Monitoring equipment for a drive control for an elevator installation with a frequency converter drive, the drive control including an elevator drive motor regulated by a frequency converter for operating an elevator car, a brake for stopping the elevator car and a safety circuit for indicating operating states of the elevator installation, the monitoring equipment comprising:

  • a motor switching and/or brake switching circuit connected between a safety circuit and at least one of a drive motor and a brake for an elevator car associated with the safety circuit, said motor switching and/or brake switching circuit responding to operation of the safety circuit for operating at least one of the drive motor and the brake, the monitoring equipment being formed exclusively of electronic components without electromechanical contactors or relays for reducing acoustic noise and electrically conducting separating locations in the monitoring equipment;

    a signal source connected to the safety circuit for supplying electrical power to the safety circuit;

    a current sensor connected between the safety circuit and an evaluating unit for generating one output signal; and

    a voltage sensor connected to the safety circuit for generating another output signal, said motor switching and/or brake switching circuit being responsive to said output signals for operating at least one of the drive motor and the brake.

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