James90012 Posted January 15, 2020 Share Posted January 15, 2020 Hello all I think I've bitten off more than I can chew. I have an electrofrog point which I'm looking to power with a Peco surface point motor. I've modified the point as per DCC electrofrog instructions and used insulfrog joiners, and then wired to a BUS. I've then wired in a relay (GM 500) to change the frog polarity with a switch etc. However I've got a strange problem, when I run a loco I get a short but only when a loco runs on one of the routes set and hits the point V. If I swap the wires around on the relay, the route that shorts switches. Any thoughts or diagrams I can cross check the work against? James Link to comment Share on other sites More sharing options...
RMweb Premium Ray H Posted January 15, 2020 RMweb Premium Share Posted January 15, 2020 Have you tried swapping the wire from the track bus over on the relay? Link to comment Share on other sites More sharing options...
James90012 Posted January 15, 2020 Author Share Posted January 15, 2020 Hi Ray - tried that but it just swaps the short to the other route. So if the blue wire is connected the train runs well with the point set straight. If I switch to the brown wire the curved route works well but the straight route now shorts. Link to comment Share on other sites More sharing options...
RMweb Premium Ray H Posted January 15, 2020 RMweb Premium Share Posted January 15, 2020 It sounds as though the relay isn't working. Have you got a test meter to check it? Link to comment Share on other sites More sharing options...
James90012 Posted January 16, 2020 Author Share Posted January 16, 2020 Thanks Ray - your post got me thinking and I've managed to fix it. My wiring from the CDU to the relay was wrong, I swapped the positive and negative and hurrah it works! Link to comment Share on other sites More sharing options...
RMweb Premium Ray H Posted January 16, 2020 RMweb Premium Share Posted January 16, 2020 Glad it's sorted. Link to comment Share on other sites More sharing options...
James90012 Posted January 16, 2020 Author Share Posted January 16, 2020 Update: worked temporarily now I'm back to square 1 and I have 2 points wired up the same way with the same problem. Link to comment Share on other sites More sharing options...
sharris Posted January 16, 2020 Share Posted January 16, 2020 I notice there are two versions a GM500 and a GM500D - the latter is 'DCC friendly', not sure if that will make a difference for you. Link to comment Share on other sites More sharing options...
Sol Posted January 16, 2020 Share Posted January 16, 2020 1 hour ago, James90012 said: Update: worked temporarily now I'm back to square 1 and I have 2 points wired up the same way with the same problem. Do both turnouts face the same way? If not - follow this wiring https://www.gaugemasterretail.com/magento/media/downloads/GM500_DS.pdf for the twin point wiring. Link to comment Share on other sites More sharing options...
James90012 Posted January 17, 2020 Author Share Posted January 17, 2020 Thanks- the points are the start of the fiddle yard so face the same way. Link to comment Share on other sites More sharing options...
James90012 Posted January 19, 2020 Author Share Posted January 19, 2020 Replaced with DCC80s and all works! Link to comment Share on other sites More sharing options...
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