LEESON NEMA 4X SCR Control: 174107.00 - Manual (Page 33)

27 Application Notes
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 11 shows a
connection for fixed high and low speed adjust potentiometers.
CW
CW
5K
OHM
5K
OHM
LOW
SPEED
HIGH
SPEED
S0502
S3 S2 S1
SO502 3-PIN HEADER
Use customer supplied
Molex connector #09-50-3031 to mate
with 3-pin header (SO502) on control board.
Figure 11. Adjustable Fixed Speeds Using Potentiometers in Series