Rockwell Automation DC3N DC Drive User Guide, 1/4-2HP-115/230 VAC - Manual (Page 39)

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Application Notes
Multiple fixed speeds
Replace the speed adjust potentiometer with series resistors with a total series
resistance of 5K ohm or 10K ohms (Figure 17). Add a single pole, multi-position
switch with the correct number of positions for the desired number of fixed speeds.
Figure 17. Multiple Fixed Speeds
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 18 shows a connection for fixed high and low speed adjust
potentiometers.
If desired, you can use two 5K ohm or 10K ohm potentiometers in parallel;
however, the maximum speed adjust trimpot must then be recalibrated. Refer to
the Max Spd section (page 32) of Calibration for more information.
Figure 18. Adjustable Fixed Speeds Using
Potentiometers in Series