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Re: (ET) Controllers

On 6/17/2014 6:29 AM, Harold Zimmerman-Clean Power Supply wrote:

  You're probably thinking of the E12S. It was pretty much electrically 
identical to the early E15 except for the fact that they left the field 
weakening components off of Card # 1, therefore it only has 3 forward 
speeds. To give us a bit of a better grasp:
  First production model by GE was E15 with Card #1 - Early (Jan?) 1970
  Second production model was E12S with Card #1 - Approx. Sept. 1970 (Last 
batch of these approx. April 1971)
  Third production model was E20 with Card #4 - Approx. April 1971
  Fourth Production model was E12 WITH NO Transistorized cards - Approx. 
June 1971
Oh Ok, so they built a pile of E15's, then E12S's, then redesigned the controller system to use complete contactor control for the E20's and later model E12's. In other words I had it backwards.
When did they switch the E12 from a field shunt wound motor to a PM motor? And did they always have that weird little clutching switch on the E12? 

Chris