Unlike a diesel locomotive with DC Traction Motors that start at full field strength, the GG-1 starts with "weak fields." The bottom left warning light on the enginemans control panel was a yellow lense with the letters "Field Changeover." This was illuminated when the throttle was advanced to #1 position, when starting, and indicated resistance was placed in the fields of the traction motors. What caused this light to burn? How was transition controlled with a voltage or current relay? There was a time period allowed for this weak field operation that if exceeded caused the pantograph relay to operate effectivelly killing the locomotive. What was this time period & how was it controlled? Did advancing the throttle to above #3 position cause a shunt around the resistance to be established
and allow transition to occur?
Any PRR MofE man who recalls this would appreciate your recollections...would like to get this post into the hands of WD Volkmer.
Thanks for any help, realize this is rather a specific subject but trust someone can pick up on it that worked on these locomotives.
and allow transition to occur?
Any PRR MofE man who recalls this would appreciate your recollections...would like to get this post into the hands of WD Volkmer.
Thanks for any help, realize this is rather a specific subject but trust someone can pick up on it that worked on these locomotives.