Safety device of elevator and its operation testing method
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorTatsuo Matsuoka
Life of this patent
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Abstract
In an elevator safety device, a brake device puts brakes to brake a car through an operation of a safety relay main contact provided to a safety circuit. When the car stops during normal operations, a safety relay instruction signal for operating the relay main contact to such a direction that the brake device puts brakes is generated from a detection circuit. Then, the detection circuit detects whether or not the safety relay main contact is operated in accordance with the safety relay instruction signal.
Claims12
An elevator safety device, comprising:
- a safety circuit including a safety relay main contact for operating a brake device for braking a car, and a bypass relay main contact that is parallel-connected with the safety relay main contact and that opens during a normal operation;
- and
- a detection circuit for generating, while the car is stopped during the normal operation, a safety relay instruction signal for operating the safety relay main contact in a direction that activates the brake device, and for detecting that the safety relay main contact is operated in response to the safety relay instruction signal.
A method of testing an operation of an elevator safety device that includes a safety relay main contact for operating a brake device for braking a car, comprising:
- detecting a state where the car stops during a normal operation and a bypass relay main contact that is parallel-connected with the safety relay main contact is open;
- generating, while the car is stopped, a safety relay instruction signal for operating the safety relay main contact in a direction that that activates the brake device;
- and
- detecting that the safety relay main contact is operated in response to the safety relay instruction signal.
Dependencies are inferred from the claim text.