[Jukebox-list] AMI Carriage junction box RR relay arcing

[Ron Rich]

Steve, You are correct--
  1. The two DC fuses are Slow Blow (SB). The two AC fuses are Fast Blow (FB) or Quick Blow QB) types.
  2. Very well could be--I thought that I had suggested that---.
  Ron Rich

Steve Wahl <steve at pro-ns.net> wrote:
  On Thu, Mar 08, 2007 at 01:14:39PM -0800, Ron Rich wrote:
> Aaron,
> As for the fuse--AMi did increase the value of that fuse in later
> production from the 8/10 to a 1 amp SB. 

1. Since it doesn't stick out very much the way Ron said it, I thought
I'd stress the *SB*, which means slow-blow. Aaron, if you've been
using regular fuses there, the slow blow type will probably cure
the problem of blowing fuses. (Slow blow lets you draw much more
current for a very short time period, but blows for a sustained
high current draw.) It won't do anything to cure the arcing, but
it'll at least keep you going while you fix the problem, if you're
not satisfied to just leave it that way.

2. Esp. to Ron, if this is in the dynamic braking circuit, is there a
chance that contacts are mis-adjusted? That is, as I understand it
dynamic braking puts a dead short across the motor so it stops
quickly rather than slowing to a stop (and overshooting the desired
stopping place). If the shorting contacts "make" before the
contacts supplying current "break", that would be a quick dead
short across the power supply, causing a lot more current to flow
and thus a larger arc when the contacts separate.

I haven't looked at the schematics nor the actual relay(s) to see
if that question makes any sense at all.

3. I've heard of capacitors being put across contacts to prevent
arcing. Would this be a possible place to apply this idea? How
would one choose the propper size capacitor?

Just trying to be helpful, although I'm paying close attention in case
I ever see this on my F, which for the time being is still running
with the original rectifier, to the best of my knowledge.

--> Steve Wahl
-- 
Steve Wahl steve at pro-ns.net

I write to make people think. Sadly, in many cases my writing makes
people think, "Man, this guy is really an idiot".
-- Nizo, on Slashdot

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