SCR Circuit Problem

  • Thread starter tanky322
  • Start date
  • #1
43
0
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 doesnt work. R2 blew when I would crank the pot up, and there was no current entering the welder. I dont know if the SCR fired or not, but it wouldnt 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 isnt compatible.

Also, im an EE student but im just starting out, I have some circuit theory under my belt, but im 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
 

Answers and Replies

  • #2
79
0
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.
 

Related Threads on SCR Circuit Problem

Replies
3
Views
5K
  • Last Post
Replies
12
Views
14K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
5
Views
4K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
5
Views
2K
  • Last Post
2
Replies
32
Views
4K
  • Last Post
Replies
12
Views
4K
  • Last Post
Replies
8
Views
446
Top