An apparatus for operating during earthquake which should be stopped to prevent an accident by detecting earthquake is provided. The apparatus detects an initial slight earthquake shock to perform a preliminary operation for earthquake by a first control device. When higher vibration is not detected within a specific time, the apparatus is reset. When high vibration is detected, an operation for earthquake including the stop of the apparatus is performed by a second control device.
An emergency control system for an elevator has a circuit for producing a signal in response to a relatively small vibration of a structure in which the elevator is installed; a first circuit responsive to the signal for controlling the operation of the elevator under a predetermined mode for a first predetermined time interval; and a second circuit for disabling the signal producing circuit simultaneously with the start of operation of the first circuit and enabling the signal producing circuit for a second predetermined time interval longer than the first predetermined time interval.
A period of time required since the output signal of an acceleration detector for detecting an earthquake exceeds a first set level, until it reaches a second set level greater in value than the first set level, is measured, and a calculation is executed on the basis of the measured value thereby to predict the scale of the earthquake, and a resetting period of time since an elevator is brought to a stoppage operation due to the earthquake, until the stoppage operation is released, is calculated on the basis of the predicted scale of the earthquake. Thus, the period of time till the reset is automatically set is variable according to the scale of the earthquake.
A controller for deciding the safety of continued elevator operation during and following an earthquake based on a comparison of currently detected seismic intensity data with stored historic intensity data. In the event the current intensities are greater than all stored data or equal to an occurrence in which faults were detected, operation is suspended at the nearest floor until a fault detection is completed. New seismic data is automatically stored along with the presence or absence of fault conditions.
A supervisory operation control system responds to detection of vibration occurring at a predetermined location of an equipment for causing the equipment susceptible to adverse influence of the vibration to perform a predetermined supervisory operation. Transition to the supervisory operation is enabled when a product of speed and displacement of the vibration exceeds a predetermined value.
