RailPro > RailPro Specific Help & Discussion
RP Keep Alive Installation
emd_16645:
This is DCC powered track. I will check the motor connection points of the chip when I get a chance. I did have to resolder the yellow wire tonight (adjacent to the gray) so possibly something is crossing there. However I am not using any functions currently, all outputs should be zero. I do have one LED wired in (rear light), and I believe that it is in backwards (get a function short when activated), not sure if that could factor in.
I suck at electrical, must be why I went mechanical. Lol
Alan:
--- Quote from: emd_16645 on October 09, 2018, 09:17:12 PM ---I did have to resolder the yellow wire tonight (adjacent to the gray) so possibly something is crossing there.
--- End quote ---
That would explain it. Examine closely.
--- Quote from: emd_16645 on October 09, 2018, 09:17:12 PM ---However I am not using any functions currently, all outputs should be zero.
--- End quote ---
Doesn't matter. Inside the LM at each output is a transistor which has the ability to block very small voltage from causing current to flow in reverse. But as the voltage increases at some point, usually around 0.6V, the transistor will go into breakdown, labeled V(be) in the datasheet, where current begins to flow backwards and the short occurs. Whether or not you are using that function is irrelevant. It is quite possible, due to the wiring problem, you are exceeding V(be) on an LM output when the throttle reaches 1%.
--- Quote from: emd_16645 on October 09, 2018, 09:17:12 PM ---I do have one LED wired in (rear light), and I believe that it is in backwards (get a function short when activated), not sure if that could factor in.
--- End quote ---
LEDs wired in backwards simply do not light up. They do not cause shorts.
As politely as I can say this, it sounds like you have multiple wiring mistakes in your installation. Suggest you rip everything out and reinstall paying very close attention to the wiring schematic you included earlier in this thread. Make all your solder connections sound and thoroughly insulate all connections.
--- Quote from: emd_16645 on October 09, 2018, 09:17:12 PM ---I suck at electrical, must be why I went mechanical. Lol
--- End quote ---
Hey, everybody sucks at something. That's why we have friends to help us out.
emd_16645:
Alan,
No offense taken, my soldering skills can't politely be described in public. My understanding of LEDs is that it wouldn't cause a short, I only mentioned it because I'm aware of how flaky wiring can be. I looked over the solder joints of the 9 pin harness and I'm not satisfied, so I have removed it. The yellow and gray wires were touching so that would be the smoking gun. I will re-wire the plug when I get a chance.
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