[GreenKeys] Pulling vs Holding selector magnets

[steve bennett]

 John,
 Mine are round, in series, and there is no terminal strip.So are pulling magnets 20mA or 60mA?I guess to be on the safe side I can always start with 20 and increase if needed.
-Steve
    On Monday, January 20, 2025 at 09:30:03 AM EST, John, W9DDD <w9ddd at tapr.org> wrote:  
 
 I think pulling magnets are rounder (fatter too?) and the holding are 
squarer in cross section.  Also think pulling are always wired one way 
(series?) and holding will have a terminal strip where they can be wired 
in series for 20 mA and parallel for 60 mA.


On 1/20/2025 7:23 AM, steve bennett via GreenKeys wrote:
> GKs,
>
>  How do I know if my M15 is using a pulling magnet vs a holding magnet?
> Why do the two variations exist?
>
> I know my coils are in series and measure 110 ohms each.
> The schematic for the holding magnet type says series coils are 0.020A 
> (not 0.060A.)
> I don't know if this  applies to pulling magnets and don't know which 
> type I have.
> Makes sense that series coils would draw less current all other things 
> being equal.
> So my loop needs to be 0.020A?
> Guess I could do a test and see how many amps my coils pull in at.
>
> Just thinking out loud.....Would a holding magnet type use some other 
> method of doing the pull in?
> Some mechanical link from the main shaft to pull the magnets in?
>
> Thanks,
> -Steve
>
>
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-- 
---
----
The above comments or recommendations are SWAG. Use at your own risk.

John, W9DDD

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