Control apparatus for people mover systems

Details Control apparatus for people mover systems Control apparatus for people mover systems

1991-04-09

1992-03-31

Olszewski, Robert P.

Conveyors: power-driven

Conveyor or accessory therefor specialized to convey people

With means to control the operation of the section

198330, B65G 1500

Patent

active

050999770

ABSTRACT:
An induction motor, which drives an escalator, can be selectively supplied by both a commercial power source and a power converting unit. A control apparatus for the escalator has a trouble detector for detecting the occurence of a trouble or abnormality on the basis of an input and/or output current and/or voltage of the power unit, an actual speed of the escalator, a speed command for the escalator speed and so on. Usually, the motor is fed by the power converting unit, and the power supply thereto is switched over from the power converting unit to the commercial power source, when the trouble detector produces its output representative of the occurrence of a trouble or abnormality.

REFERENCES:
patent: 3580376 (1971-05-01), Loshbough

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