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I recently purchased a MTH 2 motor superchief that the board went out and the man I purchased it from rewired it, using a bridge rectifier. Well it seems that under any kind of strain or after running for about a minute or so, the transformer will trip into safety mode. Does anyone have any experience with this? I have ran multiple other engines on the track with no issue. I have tried using different transformers, but the issue remains. So I'm sure there will be some questions related to the wiring and I will try to explain as best as I can. I am not an EE or anything so I apologize for my ignorance on the subject.

There are 2 AC pickups from the tracks on both trucks. The positives and negatives are both running to separate single poles on the rectifier (8 Amp 1000 V) for the AC hookups, so 4 wires to 2 poles. And then 4 DC output wires from the 2 DC poles of the rectifier to the positive and negatives of the DC motors. There is also a 1000 V capacitor on the DC poles as well.

I don't have a multimeter to see what voltages I am getting, and am not quite sure why the unit would be tripping the transformers. Running with just the engine and the matching unpowered dummy it seems to run fine up to max power, but if cars start to get added the transformer will trip, either with power increase or time.

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Rich, thanks for the advice. I am thinking that they are wired in series. The connected black wires that are coming off the - rectifier post are attached on the side of the motor with 2 white circles on one, and a red and white circle on the other, so I am assuming they are in series but could be wrong. Hopefully you can see what I am referring to in the pictures.

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Thanks for the input rob, do you have any suggestions for a larger transformer? I attached a pic of the motors with model numbers, but like I said before I can’t verify their draw.

once again sorry for my ignorance, my dad, brother, and I built a setup when we were younger and now that we have small kids we are getting back into it again.

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@newguy55 posted:

Thanks for the input rob, do you have any suggestions for a larger transformer? I attached a pic of the motors with model numbers.

Remove the capacitor first and try that, it's not needed is this application. A CW-80 or 1033 would be fine. Remove the trucks & grease the worms well.

That wire is extreme overkill, 22ga superflex is just fine.

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Ste 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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