General inverter and the application of PLC in the revolving door control

The introduction with the continuous development of society, more and more automatic revolving door, revolving door control system of high control requirements were more likely to ask. For example, when no one close to the revolving door, revolving door can automatically stop; When be long to people in and out of the revolving door, revolving door can automatically rotate faster; When press the special keys, revolving door that can enable the disabled special rotary speed; When pedestrians through the revolving door accidentally caught, revolving door brake quickly, after waiting for pedestrians liberation revolving door can automatically return to normal rotation speed; All the running condition of the revolving door into the building automatic monitoring system; And so on. Therefore, revolving door control system on the control requirements have a higher automation and intellectualization. The following in detail through a practical example using the general inverter and mitsubishi FX series programmable logic controller ( PLC） To achieve the above requirements control method. 1 the system hardware design principle of structure is a revolving door control system. The system mainly consists of revolving door, proximity sensors, programmable controller and frequency converter. 1. 1 revolving door and proximity sensor the revolving door of 4 glass door vertically with each other on the same shaft column, the shaft of the motor driven by gear institutions through the revolving door column, resulting in a door of rotation ( See figure 1) 。 Figure 1 revolving door control system structure to realize full automation and intelligent of the system, and system in the revolving door upper circular framework, and installed 4 proximity sensor, three facing the door of the pedestrian ( See in figure 1 A1) Pedestrians, a face to go out ( As shown in figure 1 of the A2) ； In the frame on the outside of the edge respectively installed 2 sets of the clamp sensor ( See the E1 and E2 in figure 1) ； On arc frame of the lateral surface, respectively installed the pause button and handicap in speed button ( As shown in figure 1 of the B1, B2, C1 and C2) ； D1 and D2 is the positioning of the revolving door or deceleration beginning travel switch. 1. 2 FX2 - 32 PLC, the system use Japan mitsubishi FX2 series PLC, as the control center of the system. The PLC from the scene of the revolving door detection signal, inverter status signal and building automatic monitoring system of instruction, after collecting, processing, complete control of the frequency of the inverter and the information feedback of building automatic monitoring system. When closed X0, start the revolving door control system. When xl closed, the speed of the revolving door is not affected by how much traffic control, with constant speed rotation. Feedback information to the building automatic monitoring system status, as shown in table 1. Revolving door operation status table table 1 note: '1' in the table according to 'ON' and '0' 'OFF'. 1. 3 converter because the revolving door in public places, pedestrians or item hinder the revolving door rotation normal phenomenon often occurs, thus cause the change of the load of the motor, over-current phenomena occur frequently, so choose general FVR0l5E7s - 7 the ex model converter. The frequency converter has a fast response to the current limiting function, when the load fluctuation is quite large, the inverter not tripping, can run automatically slow down; When the load is back to normal, the inverter can automatically advance to the set value. Low-speed driving ability is strong, with the frequency converter, motor starting torque can reach 150% of the rating. The inverter also has a series of advanced functions such as voltage self-tuning. Inverter wiring principle as shown in figure 1, all the movements are controlled by PLC controller. The system software design 2. 1 main control parameters after the commissioning of frequency converter, inverter of main control parameters are as follows: when the traffic is small or Xl for the 'ON', the working frequency of the inverter for Hz (42 Y11 to 'ON') 6 s, the motor starting time, braking time 15 s. When traffic is larger, The X3 and X4 and X5 is 'ON') , the working frequency of 50 hz frequency converter ( Y11 and Y10 to 'ON' at the same time) ； When the explorers speed button for the first time, the working frequency of the inverter into 21 Hz ( Y11 and Y13 to 'ON' at the same time) , when the second press explorers speed, the working frequency of the inverter is controlled by other site condition; When a pedestrian accidentally caught, revolving door quickly brake and after being pedestrians liberation, after 10 s delay, enable the second 'add/slowdown' select frequency converter, automatically return to normal rotation speed ( Motor starting and braking time are 25 s, realization method is Y11 and Y3 as 'ON') at the same time 。 Inverter main control terminal and the relationship between the output frequency is shown in figure 2. Figure 2 inverter output frequency and the relationship between control terminal 2. 2 PLC control application of frequency converter in figure 3 is the PLC program according to the system requirement. In the PLC program, should pay attention to the following points: (1) before the start of the revolving door mechanical brake should let inverter off-grid, to avoid damage to the frequency converter; (2) when the special speed is enabled, whether inside or outside, the second press the function button should make inverter speed back to normal.
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