Weld power pot
RSS | Subscribe | Contact Us | Advertise | About Us
Results 1 to 4 of 4

Thread: Weld power pot

  1. #1
    Join Date
    Jan 2015
    Location
    Alaska
    Posts
    151

    Weld power pot

    Anyone have issues with theirs? Around 75 amps, in low and mid range alike, my machine goes nuts. Wondering if it's the pot, or something indicative of a bigger problem.

    Powcon 300st (my favorite)
    Miller Goldstar 600ss
    Lincoln Idealarc 400/400
    Miller 12vs
    2 LN25's
    Miller Deltaweld 302
    Miller Bobcat 250 G EFI
    Miller Bobcat 225d Plus (Dropped a valve, up soon)
    Everlast 255ext (ordering soon!)

  2. #2
    Join Date
    Mar 2010
    Location
    Ceres, California
    Posts
    3,273

    Re: Weld power pot

    First the powcon operates in the audible frequency range. You will hear everything the switching circuits do. The scale on the front should be 0 to 100% of range selected. So 75 is 75% of range setting. If you use a large diameter rod and low amp setting the inverter will not like it and may produce an extra squeal. Evan new inverters will squeal if used this way. And they use ultrasonic switching (10khz and higher) So try a smaller rod. Check the current rating on the rod being used,
    Then do the math to estimate the correct machine setting. If you machine has a V/A switch, set it to A and have some one read the actual amps while you weld.

  3. #3
    Join Date
    Jan 2015
    Location
    Alaska
    Posts
    151

    Re: Weld power pot

    3/32 7018 should operate 65-100 amps easy. 75% of 10-100 is about 77.5 amps. The rod burns at 70% on that range and 80%. Just not 75%. The equivalent amp setting on the medium range does the same thing. I guess I just need to take the ****er apart and figure out how they control the output via the pot. Whether they parallel Xfrmrs and caps, then series them or whatever they do with the scr's... I'm also a controls and electronics guy. I was just wondering if anyone had similar problems.
    Powcon 300st (my favorite)
    Miller Goldstar 600ss
    Lincoln Idealarc 400/400
    Miller 12vs
    2 LN25's
    Miller Deltaweld 302
    Miller Bobcat 250 G EFI
    Miller Bobcat 225d Plus (Dropped a valve, up soon)
    Everlast 255ext (ordering soon!)

  4. #4

    Re: Weld power pot

    I changed the pot on mine. It seemed to have a dead spot in it. Just a common pot, nothing special. I think it was 5K ohms.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
RSS | Home | Penton Media | Contact Us | Subscribe | For Advertisers | Terms of Use | Privacy Statement