Control apparatus for people mover systems
AssigneeHitachi, Ltd.
InventorsMasayuki Hirose, Hideaki Takahashi, Hisao Chiba
Life of this patent
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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.
Claims16
A control apparatus for a people mover system comprising plural treadboards, continuously coupled in an endless form, which convey persons thereon:
- a driving unit including an AC motor for driving the coupled treadboards at a controlled moving speed;
- a commercial power source for selectively supplying AC source power to the motor;
- a power unit.for producing AC output power controlled in response to a control signal and selectively supplying the AC output power to the motor to make the treadboards move at the controlled moving speed;
- and
- a control unit, including a microcomputer, which generates the control signal for said power unit and controls the selective power supply to the motor by said commercial power source and said power unit,
- characterized in that said control unit is further provided with:
- a trouble detector, responsive to a predetermined signal from at least one of said driving unit, said power unit and said control unit, for detecting the occurrence of a trouble or abnormality in the people mover system;
- and
- a power switchover device for switching over the power supply to the motor from said power unit to said commercial power source in response to the trouble detection by said trouble detector
Dependencies are inferred from the claim text.