Terminal Markings and Connections
For NEMA DC Generators

All connections are for counterclockwise rotation facing the end opposite the drive. For clockwise rotation, interchange A1 and A2.
Some manufacturers connect the interpole winding on the A2 side of the armature.
For the above generators, the shunt field may be either self-excited or separately excited. 
When it is self-excited, connections should be made as shown. When the shunt field is separately excited, the same polarities must be observed for a given rotation.

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