Rockwell Automation DC3E Non-Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 22)

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Figure 4. Speed Adjust Potentiometer
Installation
Speed adjust potentiometer
Install the circular insulating disk between the mounting
panel and the 10K ohm speed adjust potentiometer (see
Figure 4). Mount the speed adjust potentiometer through a
0.38 inch (10 mm) hole with the hardware provided. Twist
the speed adjust potentiometer wire to avoid picking up
unwanted electrical noise. If potentiometer leads are longer
than 18 inches (46 cm), use shielded cable.
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