Solving SCR Circuit Problem - EE Student Seeking Help

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SUMMARY

The discussion centers on an electrical engineering student's attempt to build a circuit for controlling a 220V welder using a foot pedal and an SCR (Silicon Controlled Rectifier). The student encountered issues with R2 blowing and no current reaching the welder, indicating potential incompatibility with the SCR used. The circuit's design may require specific SCR characteristics that the student's component does not meet. The student seeks assistance in troubleshooting the circuit and understanding the appropriate voltage requirements.

PREREQUISITES
  • Basic understanding of SCR (Silicon Controlled Rectifier) operation
  • Familiarity with circuit theory and components
  • Knowledge of AC voltage systems, specifically 220V
  • Experience with troubleshooting electrical circuits
NEXT STEPS
  • Research SCR specifications and compatibility for welding applications
  • Learn about voltage regulation techniques in AC circuits
  • Study common issues and solutions in welder circuit designs
  • Explore the use of potentiometers in controlling current flow
USEFUL FOR

This discussion is beneficial for electrical engineering students, hobbyists working on welding equipment, and anyone interested in SCR applications in high-voltage circuits.

tanky322
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I came across a circuit online to vary the 220V input into a welder. This is done to control the amount of current entering the piece being welded, using a foot pedal. The circuit has worked for many people.

I built the circuit, but it doesn't work. R2 blew when I would crank the pot up, and there was no current entering the welder. I don't know if the SCR fired or not, but it wouldn't weld or make a spark what so ever.

My initial thoughts are that the circuit was designed for a particular type of SCR, and mine isn't compatible.

Also, I am an EE student but I am just starting out, I have some circuit theory under my belt, but I am not sure on what to use as a voltage in this circuit, as its all part of the 220V line.

Can anyone help me out?

Sorry for the size of the pictures, but I wanted to keep the detail.

Thank you!

pedal.jpg

kt210_Page_1.jpg
 
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In my lifetime I have worked on all kinds of complicated equipment, including welders and they are the worst because they are a basic power supply.
 

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