Rockwell Automation DC3E Non-Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 59)

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IMPORTANT: If you run the drive in AUTO mode, you
must recalibrate the MIN SPD trimpot to offset any motor
drift caused by the input signal.
The MIN SPD setting determines the motor speed when
the speed adjust potentiometer or input signal is set for
minimum speed. It is factory set to zero speed.
To calibrate MIN SPD:
1. Turn the speed adjust potentiometer full CCW or set the
external reference signal for minimum voltage or
current.
2. Adjust the MIN SPD trimpot until the motor has
stopped, or is running at the desired minimum speed.
Calibration
MIN SPD
ATTENTION: The DC3N Drive is intended to operate
at a predetermined minimum speed. If the application
requires zero speed operation, the user is responsible for
assuring safe conditions for operating personnel by
providing suitable guards, audio or visual alarms, or
other devices. Failure to observe these precautions
could result in bodily injury.
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