Safety device of elevator and its operation testing method
First Claim
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1. 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.
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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.
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Citations
12 Claims
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1. An elevator safety device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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:
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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. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification