A proud south extension NA200PLC application in double-speed elevator control

1 introduction the elevator control system mainly includes logic control system and speed regulating system. The control precision of speed control system including the speed control and position control has very important influence on the elevator comfort, this example USES the high performance frequency converter speed control system using three settlers, using rotary encoder measuring pulling speed of the motor, using the extension of pg card collection and control of the inverter output pulse signal of the closed-loop control system, make the elevator in the process of double speed running more stable. Logic control system for elevator and its important influences on the security and stability, in this case, the na200 is adopted to form logical control core of the system. Na200 to complete intelligent I/o design and a series of safety, reliability design for the system provides guarantee of safe and reliable operation. Digital output module adopts the output loop combination lock design, through the module's read, check and implement the joint control of false action in any case will not occur. Na200 with its computing speed is fast, cost-effective and good customer service has won the market recognition. This case describes the na200 elevator control system's design idea and scheme implementation. 2 the system is 2. 1 hardware system this system is mainly composed of PLC, frequency converter, and dragging lead motor VVVF control system. As shown in figure 1, which is used to complete the drag the start-stop motor, deceleration, direction, safety protection management and control of command signal. In order to make the elevator stopped the frequency conversion when stop more accurate and stable, suggest equipped with inverter braking system ( The outer braking unit and brake resistance) 。 Although resistance brake than double igbt module brake defects on energy conservation, but from the maintenance cost, obviously change the resistance than for a replacement module, and taking advantage of igbt module feedback back to the electricity grid technology popularization and use are not universal. Figure 1 inverter control system of inverter input signal includes: downward and upward signals, corresponding to the frequency converter is turn di1, reverse di2 terminal, elevators, low-speed and elevator speed signal, a corresponding frequency converter speed instructions terminal di3 and 2 speed terminal di4, and pg card to receive the signal as pulse signal, defined as open collector input terminal hardware, terminal is defined as shown in table 1. Input and output unit for PLC I/o interface part: mainly includes the input part of the hall call, compartments inside floor choice, flat layer spacing, open and closed limit detection signal, the output part of inverter control, machine control, brake, floor indicator, upward and downward directions, alarm indication signal, etc. Input circuit is shown in figure 2. Output circuit is shown in figure 3. Figure 2 input circuit configuration in figure 3 output circuit configuration PLC receives signals from the elevator's call, flat layer signal, and then according to the state of the input signal, through internal control procedures of signal processing, and finally to the signals control actuators and all kinds of display elements. In the elevator control system, due to its control of randomness, so the correlation between the various signal is very strong, logical relationship properly handled the stability of the elevator control system and has direct influence to the safety performance of the lift. Therefore, PLC controller programming techniques as in this case the key technology of the elevator control system. 2. 2 software structure: soft components and variable assignment as shown in table 2. Table 2: soft components and variable assignment programming procedures using modular design method, to focus on the I/o point, clear, facilitate system debugging and troubleshooting. Here are some function modules of ladder diagram program: ( 1) Maintenance of the state of the ladder diagram program is shown in figure 4: the default state of knobs for i0001 disconnect, when disconnected m0002 closed, regardless of the elevator is in what position, directly down to the bottom, after the elevator to the bottom, door stop on the transmitted signal to the PLC, said the elevator has reached the target location, delay after a period of time, door opened for repair work. Figure 4 maintenance status of ladder diagram program ( 2) TDD elevator has run judgment application as shown in figure 5: if the elevator at the bottom or the top floor, the runtime only one direction: up or down. If any stop in the middle layer, it needs to PLC operation will now compare floor floor and input instructions, then output the upward or downward. Figure 5 TDD elevator has run judgment program ( 3) Recent upside target determine program as shown in figure 6: floor when the elevator target floor instructions have been received, and is beginning to shift, before has not been to the destination floor, for example, is 1 layer is up and running, someone in the up button on the second floor, the recent upside target floor of the lift shall immediately update to 2, and press the up button if the 1 layer, will not affect the elevator upward motion state. Figure 6 recently upside target floor determining program ( 4) Open close program as shown in figure 7: in the process of elevator running, even if the push button to open the door, the elevator door won't open; If the door is not closed completely, also not to run up and down the elevator, to ensure the safety of the passengers. Timing starts elevator positioning is completed, 1 s to open the door, and manual door must be at the end of the time delay to action; Timer 2 s after the elevator door is closed, and manually close must also be at the end of the time delay action.
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