Re: sparking/electrical problem with Peco points



Keith wrote:

On Wed, 22 Mar 2006 21:17:14 +1200, Greg Procter <Procter@xxxxxxxxxx>
wrote:

modified to http://mrol.gppsoftware.com/livefrogwiring.asp

Now that I've taken a good look at your rewiring diagramme, I have to
ask why you break the links maked in yellow???

Because if you don't break the links marked in yellow you will have a
dead short when you add the links marked in red.
Keith

NB. I thought Grahams page would explain it,

His page says _what_ to do, but not _why_.
As I'm apparently trying to achieve an end that he has rejected, I need
to know why he says each modification should be done.

but the idea is to divide
the point up into 3 pieces, left and right stock rail/blade sets and
the frog so that the frog polarity can be externally switched. The red
links provide power to the blades at the same polarity as the adjacent
stock rail so that, 1. you are not reliant on blade contact for power

I can see that that could be a problem for me long term as I hadn't
noticed the lack of under-blade contacts.

2. the blade remains at stock rail potential when open so you can't
get shorts through the back of flange contacting the open blade.

I've never had that problem so I'm not sure I need to fix it. :-)

I don't want to fix the problem of following track isolation through
insulated fishplates because I consider it to be a positive function.

Regards,
Greg.P.
.

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