PCD230A101自动化控制模块 能够处理复杂的控制算法和任务

PCD230A101自动化控制模块 能够处理复杂的控制算法和任务

主回路的组成和功能  装置主回路完成整流和灭磁两大功能，系统采用三相全控桥可控硅整流电路，向同步电动机转子绕组提供直流励磁电流。灭磁回路由可控硅7、  8KGZ与_ _极管GZ反并联组成，实际上组成为-个大功率电子开关,完成同步电动机在异步起动过程中串入起动电阻，起动结束后自动切除，保证同  步电动机在异步起动期间，转子励磁绕组既不开路也不短路，从而避免励磁绕组承受过电压和过电流。  

励磁装置控制部分:  系统控制部分包括S7200PLC、Pro-face触摸屏、 KGLF- 2型微机励磁控制器三部分组成。PLC主要完成继电回路逻辑控制工作方式切换、 运行时PI  调节以及对外通讯等工作, Pro-face触摸屏主 要完成系统参数设置和运行时故障、工作时间、设定运行参数信息查询，Pro-face触摸屏具有 励磁电  流和励磁电压录波曲线信息查看。  KGLF-2型励磁控制器里由主机MC87C51和副机AT89C51单片机组成。励磁控制器主要完成频率测量及投励、脉冲形成、故障检测及处理。  1转子感应电压频率的测量  同步电动机起动时,转子感应电压的频率随着转速的上升逐渐下降,同步电动机- -旦起动, 单片机就立即检测转子感应半个周波的时间,从20ms开始,数  码管记"9" ,中间每增加20ms,数码减1,到200ms时数码管显示"0" 。

同步电动机在异步起动过程中,当转子转速达到同步转速的90%时，转子感  应电压的频率5Hz,周期0.2s， 半周时间为100ms,计算机-旦检测到该值,立即投全压。投全压后，电动机的转速将继续上升,当转速增加到同步  转速的95%时,转子感应电压的频率为2.5Hz,周期为0.4s ，半周时间为200ms ,计算机检测到此值，迅速进入整流程序,输出脉冲,装置投入励磁,  同时接通投励工作指示，关掉低压灭磁并开放失磁保护和失步保护等。

PCD230A101自动化控制模块 能够处理复杂的控制算法和任务

The main circuit completes the two functions of rectification and demagnetization. The system adopts three-phase fully controlled bridge thyristor rectifier circuit to provide DC exciting current to the rotor winding of synchronous motor. The magnetization circuit is composed of thyristor 7, 8KGZ and _ _ electrode GZ in inverse parallel, in fact, it is composed of a high-power electronic switch, which completes the synchronous motor in the asynchronous starting process of starting resistance, and automatically cuts it after the end of starting, ensuring that the rotor excitation winding is neither open nor short circuit during the asynchronous starting of the same step motor. Therefore, the excitation winding can avoid overvoltage and overcurrent.

Excitation device control part: The system control part includes S7200PLC, Pro-face touch screen, KGLF-2 microcomputer excitation controller three parts. The PLC mainly completes the switching of the working mode of the relay loop logic control, the PI adjustment during operation and external communication, etc. The Pro-face touch screen mainly completes the system parameter setting and the query of the information of the fault during operation, the working time and the set running parameters. The Pro-face touch screen can view the information of excitation current and excitation voltage recording curve. KGLF-2 excitation controller is composed of MC87C51 and AT89C51 microcontroller. Excitation controller mainly completes frequency measurement and excitation, pulse formation, fault detection and processing. 1 Measurement of rotor induced voltage frequency When the synchronous motor starts, the frequency of rotor induced voltage gradually decreases with the rise of speed, and the synchronous motor -- once starting, The single chip microcomputer immediately detects the time of the rotor induction half a cycle, starting from 20ms, the code tube marks "9", and every 20ms in the middle, the number is reduced by 1, and the digital tube displays "0" when it reaches 200ms.

Synchronous motor in the asynchronous starting process, when the rotor speed reaches 90% of the synchronous speed, the rotor sensing voltage frequency 5Hz, period 0.2s, half cycle time is 100ms, the computer - once the value is detected, immediately throw the full voltage. When the speed increases to 95% of the synchronous speed, the rotor induced voltage frequency is 2.5Hz, the period is 0.4s, and the half cycle time is 200ms, the computer detects this value, quickly enters the rectification program, outputs the pulse, the device is put into excitation, and at the same time, the throwing work indication is turned on. Turn off the low voltage and open the loss of magnetic protection and out-of-step protection.