Rockwell Automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 39)

31 Calibration
Recalibrate the IR COMP setting when using a lower horsepower motor.
See Figure 19 for typical IR COMP settings, or recalibrate using the
following procedure:
If the motor does not maintain set speed as the load changes, gradually
rotate the IR COMP trimpot CW. If the motor oscillates
(overcompensation), the IR COMP trimpot may be set too high (CW).
Turn the IR COMP trimpot CCW until the drive stabilizes.
FWD ACC
The FWD ACC setting determines the time the motor takes to ramp to
either a higher speed in the forward direction or a lower speed in the
reverse direction, within the limits of available torque. The FWD ACC
setting is factory set for its fastest forward acceleration time.
Turn the FWD ACC trimpot CW to increase the forward acceleration time,
and CCW to decrease the forward acceleration time.
REV ACC
The REV ACC setting determines the time the motor takes to ramp to
either a higher speed in the reverse direction or a lower speed in the
forward direction, within the limits of available torque. The REV ACC
setting is factory set for its fastest reverse acceleration time.
Turn the REV ACC trimpot CW to increase the reverse acceleration time,
and CCW to decrease the reverse acceleration time.
DB (Range)
The deadband trimmer potentiometer determines the time that will elapse
between the application of current in one direction before current is
applied in the opposite direction.
The deadband trimmer potentiometer affects the resistance that a motor has
to changes in shaft position at zero speed. It does this by applying AC
voltage to the motor armature.
Deadband is factory calibrated to approximately the 3 o’clock position for
60 Hz AC line operation. Recalibrate the deadband to the 9 o’clock
position for 50 Hz AC line operation. See Figure 17 for recommended
deadband settings.