LEESON Chassis Mount PWM Control: 175292.00 - Manual (Page 34)

Adjustable speeds using potentiometers in
series
Replace the speed adjust potentiometer with a single pole,
multi-position switch, and two or more potentiometers in series,
with a total series resistance of 10K ohms. Figure 15 shows a
connection for fixed high and low speed adjust potentiometers.
Figure 15. Adjustable Fixed Speeds Using Potentiometers in
Series
CW
S3
S2
S1
CW
5K
OHM
5K
OHM
HIGH
SPEED
LOW
SPEED
28 Application Notes