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Can’t understand system short

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  • Member since
    February 2009
  • 1,983 posts
Posted by railandsail on Wednesday, October 28, 2020 11:13 PM

What ever happened to this subject? What did NCE have to say??

I'm getting ready to make a choice of circuit breakers,...and a choice between EB1 or PSX

  • Member since
    September 2004
  • From: Dearborn Station
  • 24,041 posts
Posted by richhotrain on Thursday, October 29, 2020 4:45 AM

Brian, shame on you for not reading more of this thread. Laugh

The thread got too long so the OP started a new thread.

http://cs.trains.com/mrr/f/744/t/268920.aspx?page=2

NCE tested the EB1’s and all were good. As it turned out, the EB1’s were programmed to detect a higher current, so the main booster tripped before the EB1's could react to the short.

Rich

Alton Junction

  • Member since
    September 2003
  • 21,385 posts
Posted by Overmod on Friday, October 30, 2020 11:13 AM

richhotrain
As it turned out, the EB1’s were programmed to detect a higher current, so the main booster tripped before the EB1's could react to the short.

The important lesson here being that he 'programmed' that detection setting himself, by leaving the programming jumper on all three EB-1s in place and subsequently doing 'accessory programming on the main' without realizing the EB-1s were all following along with the CV changes.  All three of them, digitally the same, perhaps multiple times at virtual random...  

You can -- and if interested, should -- read all about it in the System Short Thread 2.

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