[GreenKeys] Model 15 Selector Magnets

[ad7i]

Thank you Jim.  Now I understand.  I'll take a look to see what type I have.

Paul, ad7i



On Wed, Jan 20, 2021 at 6:22 PM Jim Cooper <jim.w2jc at gmail.com> wrote:

> On 20 Jan 2021 at 17:02, ad7i wrote:
>
> > causes current to be routed away
> > from the pulling magnet and to the
> > holding magnet,
>
> basic mis-understanding of the concept !!
>
> A machine has only ONE type of selector magnet...
> EITHER a pulling or a holding selector magnet.
>
> As described in other replies, you can tell by
> looking for the cam on the main shaft which
> PUSHES the selector armature against the
> selector magnet face -- that is the HOLDING
> type.  Without the cam, it's the pulling type.
>
> The holding magnet concept increased the
> useable range a lot, but also allowed the use
> of 20mA loop current rather than 60mA.
>
> w2jc
>
>
>
>
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