LEESON PWM DC Control: 174299 - Manual (Page 27)

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Application Notes
Multiple fixed speeds
Replace the speed adjust potentiometer with series resistors with a total series resistance of
10K ohms (Figure 14). Add a single pole, multiposition switch with the correct number of pos-
tions for the desired number of fixed speeds.
S3
S2
S1
TOTAL SERIES
RESISTANCE
10K OHMS
Figure 14. Multiple Fixed Speeds