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

Sun Sep 6 14:25:08 EDT 2015

here is  one  version I  member   reading  that   was 1.2  ohms and took 
some ungodly amount  of   loop  current.  I  think  you won the lottery!    ed

In a message dated 9/6/2015 11:05:32 A.M. US Mountain Standard Time,  
drlegendre at gmail.com writes:

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?

On Sun, Sep 6, 2015 at 11:51 AM, drlegendre . <_drlegendre at gmail.com_ 
(mailto:drlegendre at gmail.com) > wrote:

Thank you, Jim! Just digging into it now.. 

On Sat, Sep 5, 2015 at 10:22 PM, Jim Haynes <_jhhaynes at earthlink.net_ 
(mailto:jhhaynes at earthlink.net) > wrote:

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