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Neighbor called me to come over, seems he is having a problem with a MTH F3 Diesel.

Here's the outlay, he has 2 loops, of course with sidings etc. The inner is seperated by a block. He's running his MTH as conventional on the outside loop, with the inner loop controlled by legacy. He has 2 seperate powermasters, command bases, set for each. Seems that the outer loop, running conventional, the Diesel starts up, then the engine sound stops, there is no horn or whistle, yet can be controlled to run in both directions. We only live a block apart, so I ran home and got a transformer, hook track to it, and Diesel ran perfectly with all crew talk, engine sound, horn and bells. Hooking it back to his powermaster, same problem. Decided to switch powermaster to his inner loop, on legacy. Everything ran perfectly. Now hooking up the powermaster that was connected to the inner loop Command control Legacy, to the outer loop running conventional, the Diesel now ran, sound, bells, and horn.

Should mention, the powermaster on the outside track,(conventional), I switched to his inner track. Works perfectly on all his engine's and switches.

So, same powermasters, same voltage outputs, etc. So, opinion, why would one powermaster work on the outer loop (conventional), but not the other when both are the same????

Last edited by josef
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The PowerMaster isn't a transformer Lee, it's a TMCC based controller for varying track voltage so you can run conventional engines from the TMCC/Legacy remote.

 

josef, my guess is there's some subtle difference in the output waveform of the two PowerMasters.  Since you're running conventional on the outside loop, you're getting the sawtooth waveform produced by the PowerMaster when you reduce voltage below the transformer maximum.  On the inside track with Legacy, if you're running in command mode on that PowerMaster, it's passing full voltage.

 

Did you try the problem PowerMaster on the inside track with the MTH locomotive?  My guess is the problem will follow the PowerMaster.

Originally Posted by gunrunnerjohn:

The PowerMaster isn't a transformer Lee, it's a TMCC based controller for varying track voltage so you can run conventional engines from the TMCC/Legacy remote.

 

josef, my guess is there's some subtle difference in the output waveform of the two PowerMasters.  Since you're running conventional on the outside loop, you're getting the sawtooth waveform produced by the PowerMaster when you reduce voltage below the transformer maximum.  On the inside track with Legacy, if you're running in command mode on that PowerMaster, it's passing full voltage.

 

Did you try the problem PowerMaster on the inside track with the MTH locomotive?  My guess is the problem will follow the PowerMaster.

Had to wait for my neighbor to come home, we did as your suggestion. Yes, roblem exist in the inner loop. I think you got it. Thanks

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