Fine tuning the regulators, E fine tuning the regulators – Rockwell Automation 20P PowerFlex Digital DC Drive User Manual
Page 301
Rockwell Automation Publication 20P-UM001I-EN-P - February 2013
301
Application Notes
Appendix C
Fine Tuning the Regulators
The PowerFlex DC drive control regulators have predefined values meant to
provide consistent drive performance without performing any further
configuration, with the exception of the armature current regulator, which must
always be tuned. When the armature current regulator has been tuned to meet
the requirements of the application, the fine tuning procedures for the other
regulators are not necessary. However, the fine tuning procedures can be used to
optimize the output and control features of the drive.
The drive contains the following regulation circuits:
•
Armature current regulator - The armature current auto tuning procedure
is run via Par 452 [CurrReg Autotune]. See Chapter 2 - Drive Start Up -
Tune the Current Regulator on page
•
A manual procedure to adjust the armature inductance when the
autotune steps yielded a value outside the recommended setting. See
Manually Adjusting the Current Regulator Tune Settings on page
•
Field current regulator:
•
A fine tuning procedure is available below. See Fine Tuning the Field
Current Regulator on page
•
Speed regulator - The speed auto tuning procedure is run via Par 1027
[Spd Reg Autotune]. See Chapter 2 - Drive Start Up - Tune the Speed
Regulator on page
. A fine tuning procedure is available below. See
Fine Tuning the Speed Regulator on page 307.
•
Armature voltage regulator - A fine tuning procedure is available below.
See Fine Tuning the Voltage Regulator in the Field Converter on page
.
The fine tuning procedures are included below. In order to obtain a step function,
the internal “Test generator” can be used. The goal of the fine tuning procedures
is to obtain an optimal step response. For example, it is recommended that you
directly measure the step response for the field current regulator.
The field current can be directed to an analog output on the Terminal Block
(with a 2ms sampling rate).
Using the Test Generator
The “Test Generator” function creates signals with a rectangular wave form based
on a specific frequency and amplitude. The frequency and amplitude can be
added to a configurable offset value, if needed. Par 58 [TstGen Output]
determines which regulator input signal (reference) is used; torque current, field,
ramp, or speed.