Transportation system with malfunction monitor

B - Operations – Transporting – 66 – B

Patent

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364/31

B66B 5/02 (2006.01)

Patent

CA 1040764

TRANSPORTATION SYSTEM WITH MALFUNCTION MONITOR ABSTRACT OF THE DISCLOSURE A transportation system such as an elevator utilizes a static power converter to directly energize a drive motor and another static power converter to directly energize a friction type braking element and automatically selects a mode of operation best suited for safe operation from a plurality of moles including a normal operation, a reduced speed operation, an emergency landing operation and an emergency operation in response to certain sensed malfunctions within the system including a decrease in the source voltage to a predetermined magnitude, an increase in the armature current of the motor to a predetermined magnitude, a decrease in the field current of the motor below a predetermined magnitude, an increase of an error signal as sensed by an error detector to a predetermined magnitude, a malfunctioning of the error detector, an increase in the velocity of the vehicle as sensed by a velocity detector exceeding certain predetermined magnitudes, the malfunctioning of the velocity detector, a decrease in the source current to a predetermined magnitude, a loss of a phase of source energy as sensed by a phase detector, a failure of a rectifying element within the phase detector, an improper sequential order of the source alternating phases, a predetermined temperature within a gated rectifying circuit, an improper electrical connection by a circuit connector, and the movement of the vehicle to a first position adjacent to a landing at which a stop is being made and a subsequent movement to second position. The system responds to a sensed malfunction by providing a plurality of redundant sequences and fail-safe circuits in selecting the mode best suited for safe operation. -0-

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