Announcement

Collapse
No announcement yet.

User Profile

Collapse

Profile Sidebar

Collapse
Avatar
07wingnut
Junior Member
Last Activity: Today, 05:53 PM
Joined: 04-19-2021
Location:
  •  
  • Filter
  • Time
  • Show
  • Source
Clear All
new posts

  • Thanks for the info guys. I'll stop looking at the rfc-14 and consider making my own from a 15 ohm variable tube resistor, or maybe a rotary 15ohm 150 watt potentiometer.
    See more | Go to post

    Leave a comment:


  • 07wingnut
    started a topic rfc-14 and rfc-23 interchangeable

    rfc-14 and rfc-23 interchangeable

    I know the cabling on these is different, but inside the control box, are they similar. People have said the rfc-14 is different, and yet there are references that it has the same linear power resistor in the box as the rfc-23. Cabling is easy to change as well as connectors.
    See more | Go to post

  • 07wingnut
    replied to Miller 330 A/BP build date
    Here are the power rectifiers that look like they would do the job. Almost cost half of what the whole welder was worth. ...
    See more | Go to post

    Leave a comment:


  • 07wingnut
    replied to Miller 330 A/BP build date
    I was just looking at the wiring diagram for how the main power rectifiers were connected. From what I can see, a bridge rectifier will not work. It looks like its going to take stud mounted individual diodes to do the job. However, I could sure use some reassurance that I'm not screwing up by going...
    See more | Go to post

    Leave a comment:


  • 07wingnut
    replied to Miller 330 A/BP build date
    I will, but don't hold your breath because the rectifiers won't be here till June. In the meantime I'll see if we can destroy those selenium ones with some welding. If they let the smoke out before the new ones come in, there's always the mickey mouse wire feed mig welder. Cheers.
    See more | Go to post

    Leave a comment:


  • 07wingnut
    replied to Miller 330 A/BP build date
    I just ordered a 400a 1600v Bridge rectifier, and some 50a 1000v bridge rectifiers. That should work to replace the selenium ones in the welder. The big one will be mounted on one of these heat sinks. ...
    See more | Go to post

    Leave a comment:


  • 07wingnut
    replied to Miller 330 A/BP build date
    That main selenium power rectifier takes up so much room, that there should be no problem mounting one of those 400amp silicon bridge rectifiers on a large finned heat sink. Taking a guess that the diodes in those silicon bridges are electrically isolated from the mounting base, and if this is the case,...
    See more | Go to post

    Leave a comment:


  • 07wingnut
    replied to Miller 330 A/BP build date
    Since I seem to be the only one who has the big one, does that mean I win? Perhaps that means it is the oldest machine on this forum.
    G-ManBart, thanks for the offer, sent you a PM.
    See more | Go to post

    Leave a comment:


  • 07wingnut
    replied to Miller 330 A/BP build date
    I have seen mentioned on this board that there are some really high voltages associated with the HF circuits. Does this circuit have a bridge rectifier in it, if so the specs for the bridge would have to be a lot higher for voltage. There is also a diode involved with the remote/standard switch which...
    See more | Go to post

    Leave a comment:


  • 07wingnut
    replied to Miller 330 A/BP build date

    These are all the selenium bridge rectifiers I could find. There may be one more, have to take a look at the circuit diagram. The last one is the main power bridge.
    I imagine a silicon bridge would not produce the heat that a selenium bridge does because of the lower forward bias voltage...
    See more | Go to post
    Last edited by 07wingnut; 04-24-2021, 04:50 PM.

    Leave a comment:


  • 07wingnut
    replied to Miller 330 A/BP build date
    I will take a picture of mine and post them today
    See more | Go to post

    Leave a comment:


  • 07wingnut
    replied to Miller 330 A/BP build date
    Everything on the machine seems to work fine, except for not being able to test the remote with foot pedal, since it came with no foot pedal. At the price these are selling, I may have to build my own. The major part, a 16 ohm 150 watt slide resistor is not that expensive.
    Concerning the selenium...
    See more | Go to post

    Leave a comment:


  • 07wingnut
    replied to Miller 330 A/BP build date
    Here is a pic of the front panel. The fuse mentioned is on the left hand side.
    I know that in some of the older generators that have selenium rectifiers, the advice is to replace soonest, as they seem to die with age and use, and in the case of generators, usually take an unobtanium part with...
    See more | Go to post

    Leave a comment:


  • 07wingnut
    started a topic Miller 330 A/BP build date

    Miller 330 A/BP build date

    Just acquired one of these monsters, and have a few questions. It is a
    Miller 330A /BP
    Serial R365015
    Checking the Miller site for build date did not turn up this serial number.
    Also, there do not seem to be any breakers or fuses on this machine, other than a 10A slow blow fuse...
    See more | Go to post
    Last edited by 07wingnut; 04-22-2021, 11:10 PM.
No activity results to display
Show More
Working...
X