RailPro > RailPro Specific Help & Discussion

Repeated Motor Over Peak Current alert

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ON28:
I have an older DC Kato/Stewart F3 with original motor. It ran for some time on DC until I installed a used (but working) LM3-S and used KA-3. It functioned well until one day it stopped and the HC showed a Motor Over Peak Voltage message. I tore it down, the motor tested fine on DC, then reassembled. Worked for awhile, then got the same message. Tore it down again, saw no binding in the trucks, motor fine.  Reassembled with different LM3-S and KA. When I auto-set the voltage, it ran up to 680mAh from around 380 the previous time. Ran for a couple of hours until it shut down and I got yet another Over Voltage message. HC is fine and operates my other RP locos without issues. So I am throwing it out to the group for advice here, and thanking you in advance. I use NCE for track power.

Alan:
Motor getting hot?

ON28:
Not really. Or the LM.

Alan:
Spray the brushes and commutator with contact cleaner. Carbon dust may be partially shorting the windings.

The 680mA reading is kinda high. Sure there is no mechanical issue?

ON28:
It's run normally for hours, down to crawling speed, most recently and then just stopped. I wonder if it's the TCS KA-3 reacting for some reason with the Kato motor. I have KA-3s and -4s in my Intermountain F3, Atlas GP7 and Proto 2000 BL2, with no operating problems. I tried swapping one KA-3 for another but came up with the same result. (I will note that I purchased my KAs used from a well-known RailPro operator who is switching to RP keep-alives...)

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