Emerson EV1000 Y2 inverter output pulse frequency signal in the application of AB PLC

Y2 EV1000 Emerson inverter output pulse frequency signal in the application of AB PLC controller Pan Zhiwei welcome to visit exhibition hall 2 e inverter vector frequency converter, exhibition hall, variable frequency speed regulating device. 。 。 Pan Zhiwei ningbo jie gen technology co. , LTD. , senior engineer EV1000 Y2 is open collector output frequency converter, can be defined as the output (32 kinds of function 0 - 19 is the output switch; 20 - 31 is the output pulse frequency) ( 1] 。 Because of the open collector output light lotus root isolation Y2, than other application circuit output a little complicated, plus EV1000 analog function design is very perfect, therefore, the average user rarely used this port. But in some small PLC applications, if used well, will get twice the result with half the effort. For example: in order to measure the inverter output frequency, the commonly used method is to use an analog input port. But small PLC native analog I/O port is very limited, but has several high speed counter ( Table 1. ) 。 At this time, if the definition of Y2 as the output frequency, high speed counter is used to measure the frequency, saves valuable analog mouth, sometimes will greatly reduce the cost, enhance the competitiveness of their products. This paper takes 1762 - AB company L24BWA as example to introduce application methods. Connection as shown in figure 1: Y2 through 4. 7 k resistor receives external 24 VDC power supply, pulse signal from IN0 - COM input to PLC, amplitude for 24 v. EV1000 - 4 t0037 inverter parameter Settings are as follows: figure 1 wiring diagram - 1762 L24BWA has a high speed counter, therefore, it is a function file, set the following [ 2] : need special attention, properly set the PLC controller high-speed counter port filtering time, otherwise the count will fail. Figure 2 is counting procedures, figure 3 is counting waveform. Figure 2 ladder diagram program figure 3 wave frequency calculation method is: counter HSC: 0 in a 1 second time accumulative total number of pulses into IN0, except in 200 after the results F8:0 is the inverter output frequency. In normal count, PLC port IN0 LED lights flashing. Measurement error depends on the F7 EV1000 parameters. 32 and timer T4:1 time base. In this case, the maximum error of plus or minus 0. 5Hz. Summary: different brands of PLC controller application the same, but the basic idea is the same, this method has practical significance in the small PLC application, when the analog port shortage, especially practical. Pay attention to the Y2 EV2000 inverter can only choose to 0 19, usable D0 instead. References [ 1] Ai silent raw networks energy sources limited company 'EV1000 series general converter [ 2] 阿瑟:MicroLogix1200 MicroLogix 1500可编程控制器指令集参考手册
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