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Messages - ON28

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1
RailPro Discussion & Help / Re: Sudden motor overload errors
« on: September 26, 2020, 11:24:02 PM »
Per the above, using contact cleaner, what's the best way to clean the motor?

2
RailPro Discussion & Help / Re: The Case of the Phantom Short
« on: September 19, 2020, 11:20:09 AM »
Warren's the man! The Model Railroad Shop, Dunellen, NJ.

3
RailPro Discussion & Help / The Case of the Phantom Short
« on: September 18, 2020, 05:27:02 PM »
Thought I'd pass this on. Was wiring some Atlas snap switches (with plastic frogs) crossover, four wire feeds per switch plus shim brass bus bars from stock rails to closure rails, as well as shim brass under stock rails and points. (A little extra work but works for me.) Anyway, I am testing with an RP+KA diesel to see approximate voltage, and getting a voltage drop moving through the crossover followed by a return to full power after a few seconds All the feeds are good, and the drop only occurred in one direction. Listening, I here a clicking typical of a short. Turns out the metal wheel of one car was bridging the stock rail and wing rail at the open end of the frog. Who knew?

I'll tell you who. By coincidence this past week my knowledgeable train store guy Warren said he had seen this in some higher quality Peco switches, solved by painting the too-close rail tops with insulating clear enamel. I tried this and it worked. Warren said another way to detect a short is to turn out the room lights and look for sparks...

 

4
RailPro Discussion & Help / Re: Loco current draw question
« on: September 13, 2020, 09:14:58 PM »
Thanks for that.

5
RailPro Discussion & Help / Loco current draw question
« on: September 13, 2020, 11:33:11 AM »
Hello all--

I've been wiring my HO NCE-powered layout and came across an interesting issue. My Intermountain F3 RP-Keep Alive-equipped loco showed a substantial voltage drop on a short (full wheelbase) segment of unwired track, slowed, then picked up speed when the KA kicked in. Conversely, my Atlas dual-mode GP38 -- without KA -- showed little hesitancy when crossing from powered to unpowered track. Is there a difference between these locos' minimum voltages? Should there be any slowing with a KA-equipped loco?  Thanks for your input.

6
RailPro Discussion & Help / RailPro in MRH
« on: September 07, 2020, 07:09:25 PM »
In the August issue of Model Railroad Hobbyist, Ken Patterson covers progress on layout by Campbell Rice, who uses RailPro.

https://model-railroad-hobbyist.com/magazine/mrh2020-08/whats-neat

7
New Users Start Here / Re: Introduce Yourself...
« on: August 25, 2020, 07:28:20 PM »
Hello My is Bob Van Deusen  I'm from Adams, Massachusetts in Berkshire County which is in the western part of the state. I am a G scale modeler in particular battery garden railroading. Have been modeling train since I was a young boy. I'm now sixty years old and still play with trains!!!!

Welcome! There's a major model railroad exhibit being developed in North Adams.

https://www.youtube.com/watch?time_continue=178&v=2jVJU9upN8Y&feature=emb_logo

8
RailPro Discussion & Help / Re: Low voltage warning
« on: August 02, 2020, 04:23:53 PM »
Checking inside is per NCE's instructions for also increasing voltage. I am using TCs KA3s and 4s. Volatge per the HC is usually around 13.2, less often 13.4. I've been fastidious about feeders to every rail, and have also added brass bus bars between the stock and closure rails, as well as between the stock rails and points, on my Atlas Custom Line Code 100 switches. (Peco does the latter on their switches, if you look close.)

9
RailPro Discussion & Help / Re: Low voltage warning
« on: August 01, 2020, 10:55:12 AM »
I opened the base station and measured inside with a digital multimeter per this video.

10
RailPro Discussion & Help / Re: Low voltage warning
« on: August 01, 2020, 12:01:52 AM »
If you have KA's on Bridge rectifiers, your LM is only seeing 13.25v as there is a voltage drop on the bridge rectifier.

The KAs are on LM3s, so no bridge rectifiers needed.

11
RailPro Discussion & Help / Low voltage warning
« on: July 31, 2020, 07:25:48 PM »
Per an earlier question about a low voltage warning, I checked my NCE base station output and it was 14.25v, I don't want to increase it. On hard-wired layout segments the warning usually turns off soon enough, and all my LMs are up to date. I also have KAs in my locos, and I try to get a feeder to every rail except my Atlas metal frogs, which are unpowered. I guess I'll just live with it.

12
General Discussion / Re: Layout control panels
« on: July 26, 2020, 10:40:19 AM »
Worth the wait!

13
Thanks for that explanation. I have a sister unit about the same age I haven't RP'ed yet.

14
I'm no motor savant, but it looked to be in excellent condition, no damage, magnets still strong, windings intact. Thought new brushes. I only paid $60 for the custom-painted loco. Still, only $20 for a new motor so yes, replacement indicated.

15
Update: After running the loco without the KA for about 20 minutes today, it crapped out again with a Motor Over Voltage alert. I disassembled the loco, and bench-tested the motor with my multimeter, finding a draw of more than 700mah, as per the module reading. The stall current was nearly 1 amp. Also, the motor got overly warm in less than a minute under power.

I disassembled the motor. There wasn't a lot of carbon buildup. I didn't see any obvious stray winding wires. The magnets seemed strong. The commutator was fairly clean. I removed the brushes and cleaned them with a q-tip and IPA. As I was trying to reseat one brush with a tweezer, IT BROKE IN HALF. I have never heard of this happening, but maybe deterioration of the brushes was causing excessive current draw? Could the brush springs have been too weak to begin with? Anyway, I'll be looking for replacement brushes or, more likely, an entire motor. I've got a trio of Atlas/Kato GP7s and maybe get a donor motor there.


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