RailPro > RailPro Specific Help & Discussion

Motor continuity/short problem

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Pilar Valley Railway:
Yes I know all that and how to test with ohms. Like I said, the ohms tested fine. That was not my question. You already answered my question in the last post

gregeusa:
Sorry, no intention to insult, was just reacting to "continuity"....

best, Greg

Dean:
With an Ohm meter or continuity tester, all you are measuring is the resistance of the wire. With that small amount of wire, all motors might show as a short. At work, we used a device that would measure 1/10000 of an Ohm on our DC motors. Some of these motors were 4000 HP. We were looking for shorted windings in the armature.
The only hobby DC motor I'm familiar with is the old Athearn open frame motors. What is going on inside these can motor is beyond me.
Did you try the decoders that said there was a short on a known good engine? Did you try to manually raise the stall current in the decoder?
It just seems odd that the motors ran on DC.

 

gregeusa:
you will find motors in "our" size will have measurable resistance in the windings, usually under 100 ohms, but measurable and distinct from zero ohms.

running DC as I said would most likely be on a larger supply that could tolerate higher current and probably had a thermal breaker, as opposed to the solid state overcurrent detection in this decoder, and they are not high current decoders.

All makes perfect sense.

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