RailPro > RailPro Specific Help & Discussion

LM-4S-G Erratic behavior/Intermittent "Cannot Connect"

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G8B4Life:
Just a gentle reminder for all members to be mindful of what you write. Something that was written in this thread could very well be construed as insulting, which would then be flaming which is not tolerated.

That said, I'm surprised that a modern fan would give RFI grief, that's why I didn't call them out in my earlier post.  I have various fans here, I might have to try an experiment. Also, reading back though the posts, a 3 volt drop isn't good. Something is not right as the Crest is supposed to be regulated.

- Tim

gregeusa:

--- Quote from: Gibs on December 21, 2022, 09:07:53 PM ---Greg
You really didn't get one bit of what I was saying........no surprise there.
Testing issues is a case of elimination. Always start with the easiest and most likely suspect. In this case using a battery to TEST a difference in Power type (Track V's On Board) was/is quick and easy to do and cheap.
Instead hes gone and brought an expensive new Power supply (his choice) that's checking....TRACK POWER only. In the end a battery was still used........I wonder why.
And what has he learnt at the end of the day, well its was more expensive to get a new power supply AND a battery to find out it has power issues ......... from track power as well as battery ......... Silly me.

Jordan
I'm wondering if the Module has an internal CB with an auto reset feature (that's slow to reset) and its this that keeps playing up. I'd suspect it to be a firmware issue if it is and may be a bug from the last update. This sorta thing does happen often with updates, breaks one thing while fixing something else.

Its Ring Ring Time....again.

PS: Was it just that one loco, the last one that played up, or are all the other RP equipped Loco's still doing the same as well.

--- End quote ---

Gibs, You don't read so well, read the last sentence in my post...

I completely agree to test with a battery, and eliminate the power supply and pickup contacts.

Greg

gregeusa:

--- Quote from: G8B4Life on December 22, 2022, 04:35:52 AM ---Just a gentle reminder for all members to be mindful of what you write. Something that was written in this thread could very well be construed as insulting, which would then be flaming which is not tolerated.

That said, I'm surprised that a modern fan would give RFI grief, that's why I didn't call them out in my earlier post.  I have various fans here, I might have to try an experiment. Also, reading back though the posts, a 3 volt drop isn't good. Something is not right as the Crest is supposed to be regulated.

- Tim

--- End quote ---

I would be extremely surprised if the fan has brushes... it must be brushless. In any case, the RFI from the locomotive motor itself would be orders of magnitude greater (caused by the much higher current, and it indeed has a commutator and brushes)

By the way, RFI is not only radiated, but can be conducted, i.e. the high frequency noise is on the motor wires also. If you think about it, that is why inductors and capacitors are used, for conducted RFI... they do nothing for real radio waves emanating from a device.... metal shielding is the only thing that works for radiated RFI, conducted RFI needs chokes... (don't get me started in the magnetic fields ha ha)

Greg

jordanhd87:
Hi Greg, yes I fully suspect the RFI I'm experiencing is most likely the "conductive" flavor, at least for the locomotives I have shell fans for. My shell fans are drawing from the track power inputs, go through a bridge rectifier (so the fans always turn the same direction), then to the fans. The power going into the RP module comes straight from the track inputs, pre-diode bridge rectifier. I think the shell fans are putting noise on the power input side of the RP module. While the above seems to be true for the 24v fans, some of my locos had 5v fans connected directly to the 5v outputs on the RP module. And even these ones were having communication issues. Explain that one to me...

jordanhd87:
Well so far so good. I ran two locos tonight for about 2 hrs. No issues at all. Good connectivity (well, as good as it can be for RailPro). This was using my Crest switching power supply as well. The voltage drop was only about 1 to 1.5 volts while the trains were running. My initial reading of 3 may have been erroneous on my part. So far so good. More running sessions needed to see for certain and to gain my trust back.

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