The elevator PLC control methods and characteristics of the profile

Elevator is modern architecture in relation to the important means of transport of people's life and property safety. How to improve the operation efficiency of elevator and elevator energy consumption and reduce mechanical wear and prolong the service life of the elevator, are very important research subject. Elevator is fixed to the complete sets of equipment of ascension floor with safety, comfort, stop layer is accurate, convenient operation, high efficient transportation, etc. It is guided by increasing traction system, system, safety device and electric control system. At present the elevator control widely adopted two ways, one is using microcomputer as signal control unit, to complete the elevator signal acquisition, running status and the function set, realize automatic scheduling and collection operation function of the lift, drag the control are done by frequency converter; The second mode of control by programmable controller ( PLC） Signal collection instead of microcomputer control. From the control mode and performance, this is not much difference between two methods. Domestic manufacturer most choose the second option, the reason lies in the small scale of production, design and manufacture of microcomputer control device cost is higher; High reliability, and PLC controller program design, convenient and flexible. This design with mitsubishi series FX2 PLC control static magnetic grid displacement sensor elevator flat layer control. Static magnetic grid displacement sensor in the elevator control system for the adjustment of the elevator flat layer control, electric control system of the elevator is 'central nervous', its quality is good or bad directly affects the quality of the elevator. Passenger lift and medical ladder all pay attention to comfort, comfort and running time. Want to comfort, to extend, deceleration time, thus make the running time is longer, the elevator operation efficiency to reduce. So, in order to make the elevator has high efficiency, add and subtract should have a suitable speed limit, and changes smoothly, the requirements for electronic control system is put forward as follows: safe and reliable, easy to troubleshoot, under the premise that meets the requirement, the line as simple as possible. Noise and little vibration, select the components to be rational, electromagnetic acoustic not big, installation parts of structure should have enough stiffness, and a locking measures. Able to adapt to frequent starting, stop, adjust and reversing work requirements, speed control performance is good, work is easy to transform. Plus, smooth and uniform, reducer, speed curve is smooth, the station without micro. Can realize automatic leveling layer, and the smooth layer must be accurate. Able to adapt to changes in a wide range to improve load, overload starting. According to the above characteristics and requirements of elevator running, running speed of the lift shall be in conformity with the curve shown in figure 1. Flat layer error should comply with the regulations of table 1.
An increasing dependence on the use of plc manufacturers plc controller price has made numerous changes in the programmable control systems industry over the past decades.
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