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I haven't had a chance to poke around inside to look for this, but is there a trim pot to calibrate the wire speed display on this machine?
I figure it is either measuring analog voltage to the drive motor or PWM duty cycle if that is what it uses for speed control. I just haven't had time to take measurements and examine the circuit. I would like to try and get it a little closer to reality, if possible.
Mark says they increase voltage to the drive motor while welding. I have a tach that I was going to mount to read the actual wire speed while welding. I just haven't got around to it.Quote:
Originally Posted by Rambozo
My error is the other direction. The display maxes out at around 280 but the actual wire speed is around 440. I'm used to just having a knob that goes from 1 to 10, but since it has a display, it would be fun to make it read a bit closer. I just marked the wire to get a rough idea of speed.Quote:
Originally Posted by zoama
Older model?
A few years old.Quote:
Originally Posted by performance
Attachment 13513
Right on the display board was an intersil chip that is basically a voltmeter on a chip, LED driver and ADC all in one. It had a trimmer that got me in the ballpark. Didn't have time to do any testing, and I think that also changed the stick current display, but I doubt I'll ever use this as a CC supply. Next time I get a chance I'll see how linear it is and see about tweaking it better. There is a good datasheet on that IC so it should be pretty easy to get it sorted out. The wire speed pot can use a good cleaning or replacement before I spend anymore time getting it dialed in. If there is any technical data for this machine, I would love to see it.
Overall I'm really happy with the machine. Wasn't really in the market for another MIG, but it came along and I couldn't pass it up.
Older models weren't cali rated ipm exactly. It was some logarythm. . Usually about 60 to 80 percent of wire feed.
Sorry about typos. On my phone tonight.
You must've bought it from 225 with the upgraded gun.Quote:
Originally Posted by Rambozo
You guessed it.