Rockwell Automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 23)

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ATTENTION: Because the reference potentiometer is connected
through the regulator to the armature power circuit, its terminals are at
line potential. Use a potentiometer that has a insulating shaft to insulate
the operator knob from this power circuit and that is capable of
withstanding Hi-pot tests at 2000 Volts DC for one minute. Failure to
observe this precaution could result in severe bodily injury or loss of
life.
ATTENTION: Be sure that the potentiometer tabs do not make contact
with the potentiometer enclosure. Grounding the input will cause
damage to the drive.
Installation
Speed adjust potentiometer installation
Figure 7. Speed Adjust Potentiometer
On chassis drives, install the circular insulating disk between the panel and
the 10 Kohm speed adjust potentiometer. Mount the speed adjust
potentiometer through a 0.38 in. (0.96 cm) hole with the hardware
provided (see Figure 7). Twist the speed adjust potentiometer wire to avoid
picking up unwanted electrical noise. If potentiometer leads are longer
than 18 in. (46 cm), use shielded cable. Speed adjust potentiometers are
installed on all enclosed drives.
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