Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 230)

9-30 COMMISSIONING
1557-UM050F-EN-P – June 2013
9. 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.
10.
Adjust parameter "T dc link" until the current feedback rises to about 63% of its final value in 10 ms as
shown in the figure. The overshoot should now be quite small. Increasing “T dc link“ causes the rise
time to increase. Since the desired step response is slightly unde
rdamped, “T dc link“ should not be
increased beyond the value at which the overshoot disappears.
CURRENT REGULATOR TUNED CORRECTLY
CURRENT REGULATOR TUNED INCORRECTLY CURRENT REGULATOR TUNED INCORRECTLY
11.
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.
12.
Set parameter "Idc ref step" to zero. The dc link current will return to a steady level of 0.4 pu.
13.
Stop the drive.