Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) Commissioning - ForGe Control User Manual
Page 95
Rockwell Automation Publication 7000-IN012B-EN-P - June 2014
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Commissioning the Drive Chapter 4
3.
Start the drive. The dc current will increase to 0.2pu and stay at that level
for couple of seconds. The drive records the data under this condition and
then ramps up to approximately rated current. After staying at the level for
couple of seconds, the drive will again record the measured data and then
ramp the current to zero. The current regulator bandwidth is set back to
the original value. From the recorded data, the drive will calculate the
Autotune L Input (P#217) and Autotune T DCLnk (P#218). At the end
of the tuning Input Impedance is set to Autotune L Input and T DC Link
is set to Autotune T DCLnk. During tuning if the values are determined to
be out of range, the drive will issue warnings indicated below. Try to tune
the drive again, but if the warnings persist, verify the result by tuning the
drive manually.
You may encounter one or more of the following warnings during Rectifier
tuning:
• L Input Low - indicates that the measured L Input is less than 0.02 pu. The
L Input must be tuned using the manual method described below.
• L Input High - indicates that the measured L Input is greater than 0.5 pu.
The L Input must be tuned using the manual method described below.
• T DC Link Low - indicates that the measured dc link time constant is less
than 0.020 second. The step response of the current regulator should be
checked using the manual method described below.
Input Impedance Manual Tuning
1.
Click the Display tab, and click Feature Select from the Group Name
column.
The Feature Select parameters will appear in the right window.
2.
Click Operating Mode and click Value. Select DC Current from the
pulldown menu and click OK.
3.
Click Current Control in the Group Name column. Select Input
Impedance in the Parameter Name column, and click Value.
4.
Set the parameter Input Impedance to an initial value of 0.05 pu.