Rotary Phase Converter not working...
Close
Login to Your Account
Likes Likes:  0
Results 1 to 6 of 6
  1. #1
    Join Date
    Jan 2007
    Location
    Kansas City
    Posts
    15
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    0

    Default Rotary Phase Converter not working...

    Hello All,
    My 7 year old RPC stopped working early this week. Its a 7.5 HP RPC that I use to run my Lathe & Bridgeport Mill.

    When I flip the switch, all I hear is a loud humming sound coming from the idler motor. My first thought was one or more of the start capacitors must have gone bad. So, I pulled the cover off the converter and found where two of the 3 start capacitor's had been leaking with crusty stuff coming out of one end of it. I just got through replacing both capacitors with exactly the same spec replacements -- no dice. Still hearing a humming sound.

    There are only two other components in this converter -- 2 tin covered Run Capacitors and a Relay Switch? Could the problem be in the relay or run capacitors? Or is the problem specific to the idler motor? With the power off, i was easily able to turn the motor by sticking a screwdriver through the vent hole in the end so I know the problem isn't due to the motors inability to turn freely.

    Any ideas on how to troubleshoot this are greatly appreciated!!

    -Swarf-Sweeper

  2. #2
    Join Date
    Jan 2007
    Location
    Kansas City
    Posts
    15
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    0

    Default

    Okay this weird. I took the relay out and shook it around real good, rapped on it a couple times and put it back in. RPC fired right up and did so 10 to 12 times without issue. I did see blue electrical arcing across the face of the relay. Man -- this stuff can kill ya if your not careful!

    I'm guessing arcing across the relay is not good...comments?

    Thanks

  3. #3
    Join Date
    Sep 2007
    Location
    Woodinville, WA
    Posts
    1,775
    Post Thanks / Like
    Likes (Given)
    206
    Likes (Received)
    378

    Default

    Stuck contacts on the potential relay?? It's been working for years... so just replace it.

  4. #4
    Join Date
    Nov 2005
    Location
    N E Florida
    Posts
    1,995
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    169

    Default

    One set of contacts not closing/dirty. They don't work on two of three phases.

  5. #5
    Join Date
    Mar 2006
    Location
    Oxford, MD
    Posts
    658
    Post Thanks / Like
    Likes (Given)
    13
    Likes (Received)
    56

    Default

    Quote Originally Posted by Timw View Post
    One set of contacts not closing/dirty. They don't work on two of three phases.
    +1

    Either file the contacts or (preferably) replace the relay.

  6. #6
    Join Date
    Jan 2007
    Location
    Kansas City
    Posts
    15
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    0

    Default

    I may pull that relay apart and see what's going on inside. I may file the contacts as you suggested for now, and order a replacement online.

    Thanks!

    -ss


Bookmarks

Posting Permissions

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