Safety circuit voltage diagnosis system and method for elevator

Abstract

The invention relates to a safety circuit voltage diagnosis system and method for an elevator. The system involves a voltage-stabilized power supply, an elevator safety circuit, a contactor and a main control module, wherein the front end of the elevator safety circuit is connected with the output of the voltage-stabilized power supply, the tail end of the elevator safety circuit is connected with one end of a contactor coil, the other end of the contactor coil is connected with a driving port of the main control module, a contactor contact is connected to an input port of the main control module, and the main control module is used for driving the contactor contact to be attracted, generating attraction time of the contactor contact and judging whether the difference value between the attraction time and reference time obtained through self-learning is larger than a preset time threshold value or not, if not, it is judged that the voltage drop of the elevator safety circuit is normal, and if yes, it is judged that the voltage drop of the elevator safety circuit is abnormal, and warning information is sent out. According to the safety circuit voltage diagnosis system, the elevator can automatically detect whether the voltage drop of the elevator safety circuit is abnormal or not so that maintenance personnel can check and maintain an electrical safety switch in the elevator safety circuit in time.

Description

technical field [0001] The invention belongs to the technical field of elevators, and in particular relates to an elevator safety loop voltage diagnosis system and method. Background technique [0002] Elevator has become an indispensable public transportation equipment in people's daily life, and its reliable and safe operation is related to the safety of people's travel. Elevator is a complex mechanical and electrical equipment, and its safe operation is guaranteed by various electrical switches. The elevator safety circuit is composed of various electrical safety switches connected in series. The end of the elevator safety circuit is connected to the running contactor and the brake contactor. Only when the electrical safety switches are turned on, the running contactor and the brake contactor can be closed to supply power to the motor and the brake to realize the operation of the elevator. [0003] The electrical safety switches of the elevator are located in the machin...

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that there are deviations in the parameters of the electronic components themselves, and the parameters of the semiconductor devices are also easily affected by the ambient temperature. It is difficult to accurately detect the voltage of the line, and it is difficult to be effectively used in the field of detection and diagnosis of the voltage drop of the elevator safety circuit.

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