Rockwell Automation 7000 PowerFlex Medium Voltage (B Frame) Commissioning - ForGe (PanelView 550) - Manual (Page 101)

Rockwell Automation Publication 7000-IN006B-EN-P - May 2013 97
Commissioning the Drive Chapter 5
Figure 56 - Current regulator tuned correctly
10. Set the CurReg Bandwidth parameter to the normal value of 200 rad/sec.
Confirm that the rise time of the current feedback is now approximately 5
ms and that the overshoot is not excessive.
11. Set the Idc Ref Step parameter to zero. The dc link current will return to a
steady level given by Idc Test Command.
12. Stop the drive. Set the Operating Mode to Normal, and Idc Test
Command to 0.000pu.
Motor Impedance
The motor impedance tuning function calculates stator resistance R Stator (129)
and total leakage inductance L Total Leakage (130) in the Motor Model Group.
Use these parameters to reconstruct the rotor flux. If you adjust these parameters
incorrectly, the resulting distortion in the flux feedback may cause speed feedback
or motor synchronization errors.
You must tune these parameters during commissioning; they are affected by
motor parameters and cable length. Perform the tuning process with the motor
stationary, using the following procedure.
1. Ensure that the motor is stationary. Motor turning may render test results
invalid. It is not necessary to lock the rotor.
2. Set the Autotune Select parameter in Auto-tuning to Motor Impedance.
3. Start the drive. In the first half of the test the output frequency is zero; the
dc current increases to 0.6pu for a few seconds to calculate R Stator, then
decreases to zero.
4. In the second half of the step the output frequency increases to rated
frequency with the dc current equal to 1.0pu for a few seconds. This test
may produce a small amount of motor torque and some rotation may
occur. This step calculates the L Total Leakage. Decrease the current and
set the Autotune Select parameter to Off.
Set the Parameter Autotune RStator (219) to the measured Stator resistance. Set
R Stator (129) in Motor Model equal to Autotune R Stator. If the test fails or the
values are out of range, the interface prompts with a warning indicating the cause
of the failure.
ATTENTION: During tuning, the motor may rotate in the wrong direction. To
avoid possible equipment damage, disconnect the motor from the load and test
for direction before proceeding, if the equipment is sensitive to reverse direction
rotation.