Frequency control technology has been widely used in low voltage asynchronous motors. In the application of high-voltage (3kV and above) motors, although the technology tends to be mature, the cost is high and limited. Therefore, the investment analysis was first carried out, and combined with the process requirements, actual field and multi-program comparison, it was decided to use ABB ACS1000 inverter to transform the fan. The system combines with the frequency converter by means of a programmable controller (PLC) with analog input and output, and controls the speed regulation, detection and control of the fan in the whole range according to the process requirements. The frequency conversion device adopts (closed loop) automatic control and (open loop) manual control, and the polystyrene mold shell can be easily switched. Its control points: (1) According to the requirements of the steelmaking process, the speed of the fan is controlled in a stepwise manner or the full-range speed regulation is realized by a manual adjustment device. (2) Detecting the content of soot, switching between closed loops or jumps (ie setting step speed) through PID and PLC, can realize automatic/manual switching. (3) Considering the communication with the original DCS system, the PLC adopts the SIMENS S7 200 series, whose input comes from the signals collected from the field devices, and its output controls the inverter, the motor and other devices in the industrial process.
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