Operation check device of dynamic brake circuit for elevator

Details Operation check device of dynamic brake circuit for elevator Operation check device of dynamic brake circuit for elevator

1991-08-06

1994-01-04

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318759, 187109, B66B 124, H02P 318

Patent

active

052762920

ABSTRACT:
In this invention, a provision is made for a means for detecting the voltage or current of a dynamic brake regenerative (DBR) circuit for determining whether the DBR circuit is properly functioning in an elevator system in which a DBR circuit for controlling the regenerative electrical power is connected between the input terminals of an inverter working as an electrical power source for an alternating current electric motor for driving an elevator car, so that the operation of the DBR circuit is automatically checked immediately before operating an elevator, preventing the occurrence of an abnormal situation caused by unabsorbed regenerative electrical power.

REFERENCES:
patent: 4039914 (1977-08-01), Stiegerwald et al.
patent: 4503940 (1985-03-01), Watanabe
patent: 4545464 (1985-10-01), Nomura
patent: 4663578 (1987-05-01), Iwasaki
patent: 4667776 (1987-05-01), Nomura
patent: 4678980 (1987-07-01), Sugimoto et al.
patent: 4733146 (1988-03-01), Hamby
patent: 4749932 (1988-06-01), Yonemoto
patent: 4787021 (1988-11-01), Hokari et al.
patent: 4902954 (1990-02-01), Oshima et al.
patent: 5070290 (1991-12-01), Iwasa et al.

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