Rockwell Automation Liqui-Flo AC GP Vector Drive Version 6.4 - Manual (Page 159)

Programming Reference 4-77
The higher the gain, the higher the performance of the torque loop. However, if the
gain is set too high, the drive will become more susceptible to overcurrent trips and/or
instability. Decreasing the gain will help increase stability.
This parameter is not used when the drive is programed for SVC operation.
* The low limit is calculated as 80% of synchronous speed where:
Synchronous Speed = 120 x Base Frequency
# of Motor Poles
Using a 60 Hz motor as an example:
Beyond the speed specified in this parameter, torque will be inversely proportional to
speed. Increasing this number will maximize the output voltage and, therefore,
maximize the horsepower. Lowering this number may improve dynamic performance
near base speed
U.015 Torque Regulator Integral Gain
This parameter
determines the
performance of the
torque regulator.
For most
applications, it is
recommended that
this value not be
changed.
Parameter Range: 10.0 to 628.0 radians/second
Default Setting: Power Module-dependent, see Appendix C
Parameter Type: Tunable
Refer also to parameters: U.014 Torque Regulator Proportional Gain
U.016 Field Weakening Start RPM
This parameter sets
the speed at which
field weakening
begins. Parameter Range: * to U.005
Default Setting: Power Module-dependent, see Appendix C
Parameter Type: Configurable
Refer also to parameters: U.002 Motor Poles
U.003 Motor Nameplate Base Frequency
U.005 Motor Nameplate RPM
U.017 Motor Top Speed
60 Hz Motor
Number of Motor Poles U.016 Parameter Range
2 2880 to U.005
4 1440 to U.005
6 960 to U.005
8 720 to U.005