[GreenKeys] Woot! M15 has arrived - and I am already STUCK!

[drlegendre .]

Nope, didn't know that there were two sets of coils - or that I needed to
have the motor running to actually get the thing to pull in @ 60mA.

So I turned on the motor and now the damn thing just seems to work!
Awesome..

The converter box seems perfectly fine as well, and the software only
needed a couple of tweaks. I wasn't sending LF after CR, so added that. It
also seems that there might be a minor timing bug. Should also look at
adding all the features mentioned, such as multiple CRs, lead-in with LTRS
etc.

But for now, I've got a printer. Haven't tried the KB yet..

On Sun, Sep 6, 2015 at 1:45 PM, Ralph Mowery <rmowery28146 at earthlink.net>
wrote:

> Can't say for sure from herewhat you have,  but there are two kinds of
> coils.  The pulling and the holding coils.  Don't expect the magnets to
> pull in unless the motor is running.
>
>  The switch is for either series  or parallel connection.  If using 60 ma
> of current then you want them in parallel (lowest resistance).  This is
> usually the best way to have them.
>
>
> ----- Original Message -----
> *From:* drlegendre . <drlegendre at gmail.com>
> *To:* Green Keys <GreenKeys at mailman.qth.net>
> *Sent:* Sunday, September 06, 2015 2:05 PM
> *Subject:* Re: [GreenKeys] Woot! M15 has arrived - and I am already STUCK!
>
> I've done some more digging around, and came up with something I can't
> make sense of.
>
> There's a toggle switch on the typing unit, with a screw-down locking tab
> to prevent accidental movement. This seems to be the DPDT switch which
> configures the solenoid coils in the holding magnet as either series or
> parallel connection. The switch was set to 'series' and I measured ~190R at
> terminals #45 & #46 which I believe are correct for the selector.
>
> I was expecting a 55R winding.. but got 190R. Flipping the switch dropped
> the reading to about 50R, which is close to what I had initially expected -
> so OK.
>
> Trouble is, it takes way more than 60mA to pull in that magnet. When I
> connect the 120V / 60mA supply, it just maxes out the current and sits
> there. Using a bench power supply, I found that it requires more like 265mA
> to pull in the magnet.
>
> What's going on here?
>
>
>
>
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