242 Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020
Chapter 4 Commissioning
8. Adjust the scope to trigger on the rising edge of the dc current reference
and observe the dc current feedback on the other channel. The step
response will probably have noticeable overshoot, indicating that the dc
link time constant is set too low.
9. Adjust parameter TDCLink until the current feedback rises to about 63%
of its final value in 10 ms as shown in Figure 210
. The overshoot should
now be quite small. Increasing TDCLink causes the rise time to increase.
Since the desired step response is slightly under-damped, TDCLink
should not be increased beyond the value at which the overshoot
disappears.
Figure 209 - Current Regulator Tuned Incorrectly
Figure 210 - Current Regulator Tuned Correctly
10. Set parameter CurReg Bandwidth 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 parameter Idc Ref Step to zero. The dc link current will return to a
steady level given by Idc Test Command.
12. Stop the drive. Set parameters Operating Mode to Normal, and Idc Test
Command to 0.000pu.
Idc Reference
Idc Feedback
63%
0%
Idc Reference
Idc Feedback
63%
0%
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