小知识电梯电气维修常识（Small knowledge elevator electrical maintenance common sense）.docVIP

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小知识电梯电气维修常识（Small knowledge elevator electrical maintenance common sense）.doc

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小知识电梯电气维修常识（Small knowledge elevator electrical maintenance common sense）

小知识电梯电气维修常识（Small knowledge elevator electrical maintenance common sense） Small knowledge: elevator electrical maintenance common sense Elevator portal, December 28th Safety circuit Effect： To ensure the safe operation of the elevator, many safety components are installed on the elevator. The lift can run only when each safety component is in normal condition, or the elevator will stop running immediately. The so-called safety loop, that is, in the elevator, each safety component is equipped with a safety switch, put all the safety switches in series, control a safety relay. Only when all the safety switches are connected, the safety relay is attracted and the elevator can be operated electrically. L common safety circuit switch: Engine room: control panel, emergency stop switch, phase sequence relay, thermal relay, speed limiter switch Hoistway: upper limit switch, lower limit switch (some elevators place the two switches in the safety circuit, and others use these two switches to control the power supply directly) Pit: broken rope protection switch, emergency stop switch, maintenance pit box buffer switch Car: control box, emergency stop switch Car top: safety window switch, safety tongs switch, car top overhaul box, emergency stop switch Fault state: When the elevator is stopped, all signals can not be registered, train traffic are not running, the first suspect is the safety circuit fault. You should observe the status of the safety relay in the control panel of the engine room. If the safety relay is in the release state, it shall be judged as a safety loop fault. Possible cause of failure: The phase sequence relay action of the 1. input power supply is caused by phase sequence errors or missing phases. 2., the elevator for a long time in excess load operation or blocking, causing thermal relay action. 3. speed limiter may cause overspeed switch action at overspeed. 4. lift the lift or sink caused by limit switch. 5. pit rope breaking switch. Maybe the speed li