Observation Elevators Manufacturer Introduces The Cause Of The Failure Of The Electrical Control Sys
Observation Elevators Manufacturer introduces the faults and causes of electrical control systems:
1. Failure of automatic door opening and closing mechanism and door interlock circuit: Because closing all halls and car doors is the primary condition for elevator operation, the elevator cannot operate once the door interlock system fails. Such failures are mostly caused by poor contacts or improper adjustments of various electrical components, including automatic door locks.
2. Faults caused by the insulation of electrical components: After long-term operation, the insulation of electrical and electronic components will always cause insulation breakdown due to aging, failure, dampness or other reasons, resulting in an open circuit or short circuit of the electrical system, causing elevator failure.
3. Faults caused by open circuit or short circuit of the contacts of relays, contactors, switches, etc.: In the control circuit composed of relays and contactors, the faults mostly occur on the contacts of the relay. If the contacts pass large current or are arced Ablation and adhesion of the contacts will cause a short circuit. If the contacts are blocked by dust or the contact's reed loses its elasticity, it will cause an open circuit. The open or short circuit of the contacts will cause the elevator control circuit to fail and cause the elevator to appear. malfunction.
4. Faults caused by electromagnetic interference: With the rapid development of computer technology, especially the greatly reduced cost of microcomputers are widely used in the control part of the elevator, and even the use of multi-computer control and serial communication to transmit call signals, etc., the driving part adopts The variable frequency variable voltage (VVVF) speed control system has become a popular standard design for elevators. In recent years, variable frequency door operators have also become fashionable, replacing the original DC door operators with resistance speed control. The extensive application of microcomputers has increasingly higher requirements for the reliability of the elevator control system it constitutes, mainly the reliability of anti-interference. The main external factors encountered in elevator operation are: temperature, humidity, dust, vibration, shock, fluctuations in power supply voltage, current, and frequency, high-frequency interference generated by the inverter itself, operator errors and load Changes and so on. Under the influence of these disturbances, the elevator will produce errors and malfunctions.
The above content is compiled and shared by China Home Elevator Factory , hoping to help those in need.
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|Target State: Iowa|
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Last Update : Oct 20, 2020
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