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

Sun Sep 6 16:12:42 EDT 2015

Congrats!

have  you  lubed  the  unit  yet?
would advise  to check that   before  running the  machine    for any  
amount of  time

Ed#

In a message dated 9/6/2015 12:41:42 P.M. US Mountain Standard Time,  
drlegendre at gmail.com writes:

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_ 
(mailto: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 ._ (mailto:drlegendre at gmail.com)  
To: _Green Keys_ (mailto: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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