RailPro > RailPro Specific Help & Discussion

LM-2S with a K-A, but no Bridge Rectifier??

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G8B4Life:

--- Quote from: William Brillinger on October 17, 2019, 08:14:17 AM ---without the bridge rectifier, it will explode.

--- End quote ---

Only if the polarity changes, which if you have any kind of reversing loop (or power it with DCC) it will. On a simple oval of DC track it wouldn't explode. More to the point though without the bridge rectifier it's kind of pointless anyway; without the bridge rectifier you'd be letting all that stored energy flow back down the track as well in a power interruption. The bridge rectifier prevents that so the LM gets all the juice.

- Tim

William Brillinger:

--- Quote ---Only if the polarity changes, which if you have any kind of reversing loop (or power it with DCC) it will.
--- End quote ---

or putting it on the track backwards.

G8B4Life:

--- Quote ---OR PUT IT ON THE TRACK BACKWARDS.

--- End quote ---

Why are you shouting at me? I was simply pointing out that not every use case would result in a KA explosion, the majority yes, every no.

Yes, putting the loco on the track backwards would also change the polarity to the KA and cause the KA to explode.

- Tim

William Brillinger:
sorry, not meaning to shout.

Simply emphasizing that not using the Bridge Rectifier will cause it to explode. It's guaranteed to fail, even if you get lucky and apply power to it in the one way that it might survive, next time it goes on the tracks, it probably won't be the same.

Alan:
The KA may be internally diode protected against reverse polarity. Hooked up backwards or placed on reverse polarity rails may simply cause the KA to not work rather than explode. Diode protection is prudent for the manufacturer given our litigious society.

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