RailPro > RailPro Specific Help & Discussion
LM-4S-G Erratic behavior/Intermittent "Cannot Connect"
gregeusa:
So the brushless fans have an internal oscillator to create the "shifting magnetic field" that is the "replacement" for a commutator and brushes.
It has been noted that some of these electronic circuits can cause electrical noise in sensitive circuits.
Putting an inductor in one of the power leads to the fan could solve the issue if the RP module is sensitive to conducted rfi.
If the RP module is sensitive to radiated rfi, then you need shielding.
There are simple methods to determine which (if this is the issue) is causing the issue.
Do some more verification that disconnecting the fan solves the issue, then I'd be happy to advise on simple step by step to solve the issue and keep the fan.
Greg
Gibs:
I did, before you edited it.
Stand by my statement, pity you can't.
gregeusa:
Uhh... Gibs, are you talking to me? I was not talking to you, last response was several days ago, and don't know what your problem is.
Back to the issue, if it's verified that the little brushless fan causes enough noise, it's a sad situation, radiated or conducted.
It would be good to find out what the sensitivity is, and correct it.
Many DCC setups use these fans and they work with no issues.
Greg
G8B4Life:
Well for just another data point I just did a fan experiment. The hardware is obviously not the same but what we're testing for is.
I put an 80mm brushless DC fan right next to an LM-2S. Testing with the fan powered by a battery (radiated RFI) and powered by the same PWR-56 as the LM-2S (conducted RFI) presented no issues. It connected every time and responded correctly to commands.
I have a 40mm fan here somewhere. If I can find it I'll test that one too.
- Tim
gregeusa:
The problem with these fans, is they are almost all "no name" products, and can vary wildly.
References to interference from brushless fans:
https://www.rctech.net/forum/electric-road/114069-motor-fan-interference.html
file:///C:/Users/greg.GE/Desktop/emi-emc-umf-dc-fans.pdf
https://arstechnica.com/civis/threads/electrical-interference-from-case-fan-causes-speaker-hiss.620400/
Tons of examples on the net.
Again, different fans, different problems.
Not at all unusual. Google it and see how many hits you get "brushless fan interference"
Greg
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