| 摘要 |
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.
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