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

[Ed Sharpe Archivist for SMECC via GreenKeys]

I  dunno----   
 
 
In a message dated 9/6/2015 11:26:59 A.M. US Mountain Standard Time,  
drlegendre at gmail.com writes:

Based on the measurements, they're about 90R each -  so  about 180R series 
/ 45R parallel. This is also the figure (90R) quoted in the  wiring diagram 
that I'm working from.

On Sun, Sep 6, 2015 at 1:21 PM, <_COURYHOUSE at aol.com_ 
(mailto:COURYHOUSE at aol.com) > wrote:


what are the ohms  of the  coils!?!?
 
 
 
 
 
In a message dated 9/6/2015 11:05:32 A.M. US Mountain Standard Time, 
_drlegendre at gmail.com_ (mailto: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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