Elevator Door-Open Running Protection Self-Diagnosis
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Solution Overview
Problem
The existing door-open running preventing protection devices in elevator apparatuses face challenges in self-diagnosis and independence from the elevator operation controller, particularly when using the second interruption configuration, which hinders their ability to control the power-feed switching means effectively.
Innovation Solution
An elevator apparatus is designed with a door-open running preventing protection section that can generate switching drive commands to control the power-feed switching means, allowing it to detect door-open running and interrupt power feeding, while an operation control section determines the switching operations based on normal or diagnosis modes, ensuring the protection device's independence and self-diagnosis capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the second interruption configuration is used to reduce components and wirings, then device complexity is reduced, but the door-open running preventing protection device cannot execute self-diagnosis processing
Solution Approach 1:
The control functions are segmented between the elevator operation controller and the door-open running preventing protection device. The electromagnetic contactor is controlled by the elevator operation controller during normal operation, while the door-open running preventing protection device maintains independent control capability through a separate control line with semiconductor elements, enabling both reduced complexity and preserved self-diagnosis capability.
Solution Approach 2:
The control system dynamically switches between two modes: normal operation mode where the elevator operation controller manages the electromagnetic contactor, and diagnosis mode where the door-open running preventing protection device takes control. This dynamic allocation of control authority allows the system to reduce components while maintaining self-diagnosis capability through mode-dependent control routing.
2Reliability
If the door-open running preventing protection device is made independent from the elevator operation controller, then functional safety is improved, but the protection device cannot control the electromagnetic contactor effectively
Solution Approach 1:
Semiconductor elements (transistors or thyristors) are introduced as intermediary components between the door-open running preventing protection device and the electromagnetic contactor. These intermediaries enable the protection device to control the contactor through a dedicated control line without direct integration with the elevator operation controller, maintaining functional independence while ensuring effective control capability.
Solution Approach 2:
The control architecture is segmented into independent control paths: one path from the elevator operation controller and another path from the door-open running preventing protection device. This segmentation allows the protection device to independently control the electromagnetic contactor when needed, ensuring both functional safety and control effectiveness through separate control channels.
3Device complexity
If the electromagnetic contactor is controlled solely by the elevator operation controller, then the number of control lines is reduced, but the protection device cannot interrupt power feeding independently
Solution Approach 1:
The control system dynamically allocates control authority based on operational mode. During normal operation, the elevator operation controller manages the electromagnetic contactor. When door-open running is detected, the door-open running preventing protection device overrides control through its dedicated control line, ensuring independent protection capability while minimizing control line complexity through mode-dependent control routing.
Solution Approach 2:
A dedicated control line with semiconductor elements is pre-configured between the door-open running preventing protection device and the electromagnetic contactor. This preliminary setup ensures that when door-open running is detected, the protection device can immediately interrupt power feeding independently without requiring additional control infrastructure, balancing complexity reduction with independent protection capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables the door-open running preventing protection device to execute self-diagnosis and control power feeding effectively, ensuring the elevator's safe operation and reducing the number of components and wirings, thereby enhancing functional safety and space efficiency.
Implementation Method 1
an electromagnetic contactor (power-feed switching means, a contactor) is provided to a power-supply line of at least any one of a main circuit and a brake coil. Opening/closing of the electromagnetic contactor is directly controlled by the door-open running preventing protection device.
Data Source
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AI summary
In an elevator apparatus, a door-open running preventing protection section is capable of generating a switching drive command for controlling a switching operation of power-feed switching means. When operating in a diagnosis mode in which a car is stopped, an operation control section determines the switching operation of the power-feed switching means in response to the switching drive command from the door-open running preventing protection section and generates a switching drive signal corresponding to the determination.