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Electric arc furnace (EAF) system

Views: 5     Author: Site Editor     Publish Time: 2021-08-13      Origin: Site

Electric Arc Furnace (EAF) system  

The system consists of an Advantech 5x86/133 industrial computer, input and output circuit boards (D/A board, A/D board and trigger pulse board), WB series current and voltage sensors, Fuji G11  

One spare) and ac asynchronous motor.  The system block diagram is shown in.This system uses electric drive to control the up and down motion of the electrode.  After calculation, choose the power of 7.5KW induction motor, and on the basis of the selection of frequency converter.  This system uses Fujifilm G .Point is: no need for positive and negative conversion signal, only according to the given frequency control output voltage size and polarity can control the motor speed and steering.  

The sensor samples from the ct because the arc current of the electrode is too high (about 25kA).  Because the input signal of A/D conversion card is voltage type, we choose .WBI412as1Q type current - voltage sensor.  For the arc voltage (usually about 250V), no intermediate link is needed. For ease of control and maintenance, each phase of the electrode is a separate set of equipment (including sensor, inverter, motor and printed circuit board), which is designed in the control software .continuous charging EAF - CHNZBTECH

The principle of control. In addition, the rated current setting and power supply modules need 0 to 12V power supply, can be through small transformers and WY17812, WY27912 and other groups  

A/D conversion card of TYPE PCL730 developed by Advantech company is selected in this system. This card provides 32 DIO (DigitalInputOutput) channels, including 16 input channels and 16 . With light coupling isolation, used to improve the anti-interference ability of the system.  The resolution is 12 bit PCL728 D/A conversion card as the output card, this board has two channels.

The jumper of the card is set to -10V ~ +10V, you can directly control the frequency converter.  In the above system, A/D conversion card of type PCL813 with 12 bit resolution is selected . Arc current, arc voltage and current set value can be converted to a/D with only one piece.  

Frequency converter and related circuits  

Fujifilm inverter terminal 12 is the set voltage input terminal, terminal 11 is the analog signal common terminal, FWD is the run/stop command terminal, CM is the contact input common terminal.  Because I can't  

Turn on the main circuit power supply method to operate the converter operation and stop.  Using the circuit shown in Figure 5, simply press the button to switch SB for AC while keeping the main circuit on  

Pull KM1 to make the indicator light, KM2 to the frequency converter power  

This type of frequency converter is set, monitored and queried by keyboard and panel operating system (screen conversion hierarchy).  The operator can set his/her own information by LCD monitor and operation key .Maximum frequency, rated voltage, acceleration time, torque characteristics, etc.  During the running process, select the data that you care about (such as output voltage) as the real-time monitoring object.  The designers also. It is required to design appropriate brake resistance, handle alarm output signal and anti-interference measures  


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