Results 1 to 5 of 5
  1. #1
    Join Date
    Dec 2004
    Location
    Chicago area
    Posts
    5,706
    Post Likes

    Rtaa200 exv board (1u3) valve power supply

    Ive got an existing board that no longer supplies the 25 to 30vdc to the valves.

    I picked up a new board, but obviously something killed the original.

    Can I use a 30vdc external power supply and use the old board to do the step control to test if one of the valves is bad?

    Or is there a fuse (what amps)I can put inline with the power feed to the exv’s to prevent overloading and wrecking the new board?


    Sent from my iPhone using Tapatalk

  2. #2
    Join Date
    Nov 2004
    Location
    up in the hizzy
    Posts
    2,853
    Post Likes
    Perfect opportunity to justify the purchase of the SMA-12, I got mine from United for $230
    There is not better place for the working men than the union! 100% UA the only HVAC union!

  3. #3
    Join Date
    Dec 2004
    Location
    Chicago area
    Posts
    5,706
    Post Likes
    Thread Starter

    Rtaa200 exv board (1u3) valve power supply

    Quote Originally Posted by valdelocc View Post
    Perfect opportunity to justify the purchase of the SMA-12, I got mine from United for $230
    What is the sma-12?

    I assume a exv test tool?

    Is it compatible with the Sporlan SEO-100?


    Sent from my iPhone using Tapatalk

  4. #4
    Join Date
    Dec 2004
    Location
    Chicago area
    Posts
    5,706
    Post Likes
    Thread Starter
    This is what sporlan shows on the parts list




    Sent from my iPhone using Tapatalk

  5. #5
    Join Date
    Dec 2004
    Location
    Chicago area
    Posts
    5,706
    Post Likes
    Thread Starter
    Just like I thought, that tool is not compatible.

    STA-12 works with the 12v bi-polar and unipolar stepper valves.

    This one pre-dates that. Operates on 30 v power

    And 9 volt phase step signals.


    Sent from my iPhone using Tapatalk

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.