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一、概述 本系统应用在徐钢镀锌焊管厂由日本引进的KHP-11U3″焊管机组上,高频机的主要技术参数是: 工作电压:380V,可控硅交流调压 工作频率:350～380kHz 输入功率:250kVA 系统采用微机DDC的PID控制方式,其控制原理如图1所示。探头测得的温度信号经光导纤维传输到温度探测器,经光电转换、分离、检波之后,温度探测器输出0～1mA直流电流信号,由接口电路进行I/V、A/D变换,成为数字量进入微机,进行PID运算,
I. Overview This system is applied to the KHP-11U3 welded pipe unit imported from Japan by XGC Galvanized Welded Pipe Plant. The main technical parameters of the high-frequency machine are: working voltage: 380V, AC voltage-controlled thyristor working frequency: 350 ~ 380kHz Input power: 250kVA The system uses microcomputer DDC PID control, the control principle shown in Figure 1. The probe temperature signal measured by the optical fiber transmission to the temperature detector, the photoelectric conversion, separation, detection, the temperature detector Output 0 ~ 1mA DC current signal, the interface circuit I / V, A / D conversion, a digital into the microcomputer, the PID operation,