Moeller - Pole-changing motors

Motor circuit [t-head1-pg]


Circuit A Selection of low and high speed only from zero. No return to low speed, only to zero.		Circuit B Selection of either speed from zero. Switching from low to high speed possible. Return only to zero.		Circuit C Selection of either speed from zero. Switching back and forward between low and high speed (high braking torque). Return also to zero.

3 speeds [t-head3]

The 1:2 speeds - tapped windings - are supplemented by the speed of the separate winding. This speed can be below, between or above the two tapped winding speeds. The circuit must consider it (→ figure).

Preferred speed combinations are:


Speeds	1000/1500/3000	750/1000/1500	750/1500/3000	= separate winding (in the circuit diagrams)
Number of poles	6/4/2	8/6/4	8/4/2
Connection	X	Y	Z