RailPro User Group
RailPro => RailPro Specific Help & Discussion => Topic started by: roofintrash on December 23, 2015, 08:44:22 AM
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I'm having low track voltage warning issues with all of my brand new Athearn locos. 14 gauge buss with 22 gauge feeders to every piece of track. Multimeter is reading 14.55 volts while getting the warning on the controller. The wheels and track are spotless and I'm getting flustered. I never get the warning on my Katos or even on converted old spectrums. Am I worrying about nothing or is something else going on?
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I'm assuming you are using the multi meter right at the location the loco is at?
I wonder what the measured voltage would be on the feeds inside the loco?
Is the warning only happening while the locos are moving, or is it all the time?
How is the module wired into the loco?
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I too sometimes get the low voltage warning even when the track voltage is verified as correct. My power supply is a switch mode regulated 15v unit. Bus wiring is 12 AWG, feeders are 24 AWG, every rail has a feeder. Voltage measurement at the resistor dampening load point furthest from the power supply indicates 14.8v with the system fully loaded at 7A (using car headlights).
At one time I installed a small digital voltmeter directly on an Atlas FM H16-44 locomotive so I could monitor the voltage at the module connection. The low voltage warning would appear sporadically with the voltmeter indicating 15 +-0.5 volts. The operation of the locomotive doesn't appear to be any different when the warning occurs. I have noticed the warning is more likely to occur when I first start a locomotive in motion. Grew tired of trying to track down the problem and since it has no noticeable effect on loco operation I have since just disregarded it. It doesn't seem to matter whether there is a single loco or multi-loco consist.
The meter I used on the loco: http://www.buyincoins.com/item/16267.html#.Vnq3EhUwhjF (http://www.buyincoins.com/item/16267.html#.Vnq3EhUwhjF)
If someone knows the remedy I am all ears.
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It only happens when the locos are moving. Most are just plugged into the stock circuit board but I did hardwire one and no change. Ive tested the track where and when it's happening and it reads fine. I may have to purchase one of those mini meters to check the loco while running. The layout is divided into 2 power districts,one lower staging and one for the main and yard. Each section has it's own PWR 56. There is a feeder to every piece of track. I'm baffled and feel like I'm just missing something stupid.
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did you "calibrate" each of the locos?
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If you mean the draw test when you first set them up,,yes. Even re did it to make sure.
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well, I'm stumped. I've only seen low voltage messages when I have the loco too far away from the power supply and adding more bus wire fixed that.
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The other strange thing, is if I have the status screen up while the loco is running the voltage bar doesn't change but the status message will still change between OK no faults and low track voltage. Zero change in speed or performance.
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This will happen 2" away from the power supply or 20' from the supply. Also happens in both power districts.
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The other strange thing, is if I have the status screen up while the loco is running the voltage bar doesn't change but the status message will still change between OK no faults and low track voltage. Zero change in speed or performance.
I see the same.
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time to contact Tim. Sounds like a programming bug. email support@ringengineering.com
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E-mail sent.
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Are the Athearn locos hardwired to the trucks? I mean have you physically checked to see if the wires from the trucks are soldered to the sideframes? Or are these some of the Athearn RTR locos that pick up the negative power from the frame?
I ask because the low voltage warning can come up if power supply to the module is intermittent. I've seen it pop up before going over switches and have seen it on straight track in locomotives where the power supply isn't fully hardwired. It will show up if the locomotive doesn't fully drop power (ie no loss in sound or movement). It seems that a momentary cessation of power will trigger the fault even though it has no visible effect on the locomotive itself. Like Alan I usually don't worry much about it because the locomotive will normally continue to operate just fine (unless I have dirty track/wheels).
With almost all my locomotives being hardwired at ALL electrical connection points I have not had this happen too often recently. The fact that it shows up only on your Athearn's tells me there is likely something in the electrical path from the wheels to the module that likely could be improved. However, like Bill said it could be a software issue that needs to be ironed out with an update.
-Kevin
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Older Athearn engines are known for their low quality wheels ans poor truck pick ups. I have not converted any of my Athearns yet but did recently pick up a book at the hobby shop that gives you tips on how to upgrades these engines that includes wheel swaps. I moved the book recently so I can't find it to give you the title but will continue looking.
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Yes,all soldered pick ups. Ive been trouble shooting this for a while now to no avail. I'm running out of ideas and will probably just ignore it as it doesn't alter the performance at all. Just bugs the crap out of me.
These are all brand new,dcc ready,purchased in the last 8 months. I'm well aware of the issues with the older series and the sintered wheels and crappy electrical pickup.
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Rick, I've also seen some issues with the truck pick-up wires themselves on a few Athearn RTR (DCC-ready) locos. Though the wire may appear fine on the outside the thin strands on the inside are brittle and may be broken without you knowing. I've seen it before, not a common thing though. Not sure if that's the problem or not.
Sounds like you've done your due diligence though and have hit all possible problem areas. Chances are a simple software tweak in the next update will take care of it.
-Kevin
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out of curiosity, what are the model numbers of the locos?
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It wouldn't hurt to replace or even double up on the truck feeders. Small wires can break and you will never see it.
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Here is part of the reply from ring.
"We think it is most likely that you are getting low voltage detected by the module. The reason why you may not see it on the loco info page meter or on a DC volt meter is both of these displays are heavily filtered (take some thing like 1 second to respond to voltage changes) but the low voltage detection in the RailPro module is very fast (can detect something like a voltage drop for 0.05 seconds). So the module can detect a brief interruption in the electrical connection that a DC meter or the HC info screen would not show."
In my opinion, if the sensitivity is that high ,I'm just chasing ghosts. I am going to try to improve the pickups the best I can and go from there. If I figure something out I'll chime in and share my findings.
out of curiosity, what are the model numbers of the locos?
Model #s are 94754 94752 98061 and an SW 1500 I can't find the box for.
All 4 act exactly the same. Never in the same places either. Just out of the blue. I'm not gonna rip my last 8 hairs out over it after I fiddle a little more.
Thanks for the input and suggestions.
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I have had similar warnings with no stalling or any other visible indication of a problem. I have come to ignore them most of the time. LM modules, in my experience, are much more sensitive to dirty wheels and track than DCC, and will report a slight momentary interruption immediately.