Rockwell Automation WebPak 3000 DC Drive Application Workbook Version 1.1 - Manual (Page 71)

Configuring the Tension Outer Control Loop 12-3
12.1.2 The LEAD / LAG Block
The tension feedback signal is also conditioned by a LEAD / LAG block, which is set to
approximately cancel the lag attributable to the speed loop bandwidth. Refer to figure
A.18 in Appendix A of the software manual (D2-3444).
þ
To set up the LEAD / LAG block:
▲ Set TEN FDBK LL BYPASS (P.845) to OFF .
▲ Set TEN FDBK LL LOW FREQ (P.835) to the same value as SPEED CROSS OVER
(P.133).
▲ Set TEN FDBK LL RATIO (P.836) to 7.5.
þ
To bypass the LEAD / LAG block:
▲ Set TEN FDBK LL BYPASS (P.845) to ON .
12.1.3 The Tension Loop PI Block
Refer to figure A.19 in Appendix A of the software manual (D2-3444) as you configure
the tension loop
PI block.
The input to the tension loop PI block is TEN LOOP ERROR (P.834), which is a read-only
parameter.
þ
To set the PI block integral gain:
▲ Set TEN PI LEAD FREQ (P.840) to 0.2 radians/second.
þ
If the drive is a variable diameter section:
▲ Tune the proportional gain at empty core diameter.
þ
To set the PI block proportional gain, TEN PI PROP GAIN (P.841):
▲ Set TEN PROFILER ENABLE (P.878) to DISABLE .
▲ Set OCL TYPE (P.818) to CASCADE .
▲ Set OCL SELECT (P.817) to TENSION .
Range: OFF , ON P.845 =
2))
Range: 0.01 to 34.90 RAD / S P.835 = RAD / S
Range: 2 to 20 P.836 =
Range: OFF , ON P.845 =
21
Range: 0.00 to 141.37 RAD / S P.840 = 5$'6
Range: ENABLE , DISABLE P.878 = ',6$%/(
Range: CASCADE , PARALLEL P.818 =
&$6&$'(
Range: NONE , TENSION , CURRENT , POSITION P.817 =
7(16,21