Rockwell Automation WebPak 3000 DC Drive Application Workbook Version 1.1 - Manual (Page 64)

11-2 WebPak 3000 DC Drive Application Workbook, Version 1.1
▲
Set STORAGE (P.857) to equal the amount of material in feet that can be stored
in the dancer over which the position feedback varies from 0 to maximum.
▲
Set TOP LINE SPEED (P.020) to specify the maximum machine speed in feet per
minute. Note that the units of length must be the same as the units used for
STORAGE (P.857).
▲
Set POSITION CROSS OVER (P.239) to specify the crossover frequency of the
position loop. This should be set to 5 radians/second. Any higher setting
should be tested so that the proportional gain of the position loop (KP) does
not exceed 60.
þ If P.239 > 5 radians/second:
▲ See the formula and example at the end of section 11.1.
▲
Set POSITION ZETA (P.242) to 1.0. This is the position loop damping coefficient.
▲
Set OCL TYPE (P.818) to CASCADE .
The position gain profiling block outputs the calculated values of four parameters:
•
POS PI KP OUT (P.248) - the position loop PI block proportional gain.
•
POS PI WLD OUT (P.249) - the position loop PI block lead frequency.
•
POS LL WLO OUT (P.246) - the low frequency setting of the position feedback LEAD / LAG
block.
•
POS LL RATIO OUT (P.247) - the ratio of the lag-to-lead frequencies of the position
feedback LEAD / LAG block.
Constant Diameter Applications
For constant diameter applications, the gain profiler is bypassed.
þ
To configure the drive for constant diameter applications:
▲
Set POS PROFILER ENABLE (P.253) to DISABLE .
Range: 0.0 to 10.0 FEET P.857 = FEET
Range: 0 to 5000 FPM P.020 = FPM
!
ATTENTION: If POSITION CROSS OVER (P.239) is set to a value higher than
5 radians/second, instability could occur. Failure to observe this
precaution could result in damage to, or destruction of, the equipment.
Range: 0.00 to 60.00 RAD / S P.239 = RAD / S
Range: 0.10 to 10.00 P.242 =
Range: CASCADE , PARALLEL P.818 =
&$6&$'(
Range: DISABLE , ENABLE P.253 =
',6$%/(