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Operation check device of dynamic brake circuit for elevator

  • US 5,276,292 A
  • Filed: 08/06/1991
  • Issued: 01/04/1994
  • Est. Priority Date: 08/13/1990
  • Status: Expired due to Fees
First Claim
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1. Apparatus for an elevator having a dynamic brake regeneration (DBR) circuit for absorbing regenerative power from an inverter, comprising:

  • detection means, responsive to the voltage or current of a regenerative power absorbing device, for providing a sensed signal having a magnitude indicative of said power;

    a comparator, responsive to the sensed signal and to a reference signal having a selected magnitude, for comparing the magnitudes of the sensed signal and the reference signal, for providing a normality signal having a magnitude indicative of a normal or abnormal condition in the DBR circuit; and

    signal processing means responsive to a run/stop signal for controlling said inverter such that when said normality signal indicated an abnormal condition of said DBR circuit, said inverter is not operated.

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