| CPC B66B 5/16 (2013.01) [B66B 1/32 (2013.01); B66B 5/06 (2013.01); H02J 7/0013 (2013.01); H02J 7/0048 (2020.01); H02J 9/06 (2013.01)] | 10 Claims |
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1. An elevator comprising:
a car lifted and lowered along a guiderail on an inside of a shaft;
a car speed detection device that measures moving speed of the car;
an emergency braking device provided in the car and including a braking mechanism configured to be capable of coming into press contact with the guiderail and emergently stopping the car when the moving speed of the car exceeds a threshold;
an electric actuating unit that actuates the emergency braking device using electricity according to an operation command;
a battery that supplies electric power when supply of commercial power supply to the elevator is interrupted; and
a safety control unit that monitors abnormality of the elevator and controls operation of the electric actuating unit, wherein
the safety control unit measures remaining power of the battery when the supply of the commercial power supply is interrupted and the electric power is supplied from the battery, determines, based on a change in the remaining power of the battery over time, an operation propriety of the emergency braking device at a commercial power supply restoration time at which the commercial power supply is restored, the operation propriety indicating whether to release the emergency braking device, and controls operation of the electric actuating unit at the commercial power supply restoration time based on content of a determination of the operation propriety,
the safety control unit includes:
a battery-remaining-power measuring unit that measures the remaining power of the battery as time elapses when the electric power is supplied from the battery;
a safety determining unit that performs abnormality determination for the elevator and controls the electric actuating unit based a determination result; and
a storing unit that stores determination content of the operation propriety at the commercial power supply restoration time for the emergency braking device, and
the safety determining unit
determines, based on transition of the remaining power of the battery measured by the battery-remaining-power measuring unit, whether abnormality is present in the battery,
when determining that abnormality is present in the battery, stores in the storing unit, as determination content of the operation propriety, automatic release prohibition information for prohibiting automatic release for releasing a state in which the braking mechanism of the emergency braking device is in press contact with the guiderail at the power supply restoration time,
when determining that abnormality is absent in the battery, stores in the storing unit, as the determination content of the operation propriety, automatic release permission information for permitting the automatic release for releasing the state in which the braking mechanism of the emergency braking device is in press contact with the guiderail at the commercial power supply restoration time, and
controls, at the commercial power supply restoration time, the electric actuating unit based on the automatic release prohibition information or the automatic release permission information stored in the storing unit.
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