Anyone dealt with this. Wire speed is on full boar and will not slow up.

I replaced the potentiometer switch. No go. It ties into the circuit board after that. Great. So I assume nothing else to swap but the board. It is out of warranty.

Now, As far as rigging something.

All the pot did was regulate the power to the rc car style motor that turns the rollers. I got 12 volt on the power wire to the motor out of the board.

I was thinking of taking another pot rated to 12volt and tying it in line to the motor. I use flux core so there i s no need to be tied into the circuitry as far as I am concerned.

Stock pot was .5w 50k, just looking for something stupid cheap to tie in to motor and make it slow down.

Any comments or suggestions. I will step up to a Miller 210 next go round, but would like to get some more use out of this thing.

I'll see what I can find out Wednesday. My electronics professor used to work on Miller/Hobart welders, when he went to school. What model is it btw? If it is a newer one, I could bring mine in and we could examine it to find out what you need to do. :)


Jason

Hobart Handler 135. Going on 4 years old I believe.

Like I said it just will not slow the wire down. I tightened the spool up real tight to help, but that just makes it jittery and not pull through.

Like I said I would just put 2 wires in line from the little motor and run it outside the case an adjust something from there if I know what I really need.

Pop over to http://www.weldingweb.com/index.php and see what you find , those guys should be able to help you pinpoint the problem.

Chances are there is a lot more to it than just a potentiometer to the motor. The potentiometer probably goes to a much more ocmplicted logic circuit and it's the logic circuit that's fried. Look on the circuit board for any burned spots or cold solder joints.

time to step up - 251, not the 210!

Ok, I talked with my professor last night after another class I have him for. On the board for the wire speed control, there is a voltage regulator. Sometimes they will fail. He dealt with the problem on occassion because of the heat they produce. It will be a small device on the board. Sometimes, they will also have their own heatsink.

Here is an example of one type of a voltage regulator
http://www.opamp-electronics.com/~opamp/catalog/images/LM7918CT_1A_18V_TO-220_Negative_Voltage_Regulator_012950.jpg



If I were closer, I'd try to help you out more than this. Electronic components are a lot easier to trouble shoot when they are sitting in front of you.


Jason