Rockwell Automation DC3E Non-Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 62)

6. Adjust the CURRENT LIMIT trimpot slowly CW until
the armature current is 120% of motor rated current.
7. Set the speed adjust potentiometer or external reference
signal for zero speed and remove power.
8. Remove the lock on the motor armature shaft.
IR COMP
The IR COMP setting determines the degree to which
motor speed is held constant as the motor load changes. It
is factory set at optimum motor regulation for the highest
motor horsepower.
To calibrate IR COMP, refer to Figure 13 on page 59, or
use the following procedure:
1. Turn the IR COMP trimpot full CCW.
2. Set the speed adjust potentiometer or external reference
signal until the motor runs at midspeed without load
(for example, 900 RPM for an 1800 RPM motor). A
hand held tachometer may be used to measure motor
speed.
3. Load the motor armature to its full load armature
current rating. The motor should slow down.
4. While keeping the load on the motor, rotate the IR
COMP trimpot until the motor runs at the speed
measured in step 2.
54 Calibration
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