Overload Sizing and FLA when using RPC - Page 2
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  1. #21
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    Quote Originally Posted by *D'B=6bk View Post
    Some new info here from OP:

    I tried waiting 20 minutes between restarts and it tripped. So I tried waiting an hour, still tripped. It seems that the aptly-named ESP100 senses when I've given up and moved onto some other project before returning to a cold-start state.
    It means the problem is worse than what you described in post #1.

  2. #22
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    If you want to change to a solder pot, Allen-Bradley or Furnas. Not sure of the other manufactures. The other option you could try is to fool the OL into thinking it has balanced current by looping one of the wires through the 3d phase opening. I don't thing the ESP100 has phase reversal. Third wire, the generated leg, just goes to the motor and is unprotected, open delta.

    Tom

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    Electronics like clean power. Clean you are not going to get from an rpc. As others have suggested, a less sensitive overload will solve the problem.

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    Quote Originally Posted by PocoLoco View Post
    Electronics like clean power. Clean you are not going to get from an rpc. As others have suggested, a less sensitive overload will solve the problem.
    RPC are "clean" enough. Decent sine waves, no switching noise artifacts.

    Just never quite perfectly in balance.

    BFD.

    This one is a OL issue. Nothing magical.

  5. Likes TDegenhart liked this post
  6. #25
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    Quote Originally Posted by PocoLoco View Post
    Electronics like clean power. Clean you are not going to get from an rpc. As others have suggested, a less sensitive overload will solve the problem.
    No, the phase imbalance is not negotiable in a overload built for that kind of service. Only the current is adjustable. The trip point for imbalance is a percentage and built into the device. That is for a common OL block. Unless you move your design and pocket book to a higher level.

    http://time-mark.com/Documents/Datas...e-Detector.pdf

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    SOLVED!

    I swapped the original Furnas ESP100 overload for an AB 193 overload. Kept everything else the same and the lathe now does warm starts with no issues at all.

    Before:
    esp.jpg

    After:
    ab.jpg


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