DRIVES AND CONTROLS 



223 



MULTISPEED MOTORS, VARIABLE TORQUE, KEY DIAGRAMS 



T4 T4 



\ ■ 



Single winding, two speed 

 N.E.M.A. MG 6-41, Fig. 4, 1930 



Speed 



Low. . 

 High. 





Ti, Ti, Ti open 

 Ti, Ti, Tz together 



Single winding, two speed 

 A.S.A. C-6 3.720, 1938 



Speed 



Low. 

 High. 



L; 



Ti, Ts, Tc open 

 Ti, Tn, Tz together 



T. 



Two winding, three speed 

 N.E.M.A. MG 6-41, Fig. 4, 1930 



Speed 



Low*. . . 

 Second t 

 High*... 



Terminals not listed must be left open. 

 * Low speed half of high speed, 

 t Second speed between low and high. 



Two winding, three speed 

 A.S.A. C-6 3.720, 1938 



Speed 



Low*. . . 



Second t- 



Tu Ti, Tz together High*. . . 



Ti, T2, Tz together 



Terminals not listed must be left open. 



* Low speed half of high speed. 



t Second speed between low and high. 



Two winding, four speed 

 N.E.M.A. MG 6-41, Fig. 4 1930 



Speed 



Low 

 Second . 

 Third.. 

 High... 



Two winding, four speed 

 A.S.A. C-6 3.720. 1938 



Ti, Ti, Tz together 

 Tn, Tn, r, 3 together 



Terminals not listed must be left open. 



Terminals not listed must be left open. 



