Rockwell Automation WebPak 3000 DC Drive Application Workbook Version 1.1 - Manual (Page 10)

2-2 WebPak 3000 DC Drive Application Workbook, Version 1.1
2.3 About Scaling
The WebPak 3000 drive follows the scaling conventions described in sections 2.3.1
and 2.3.2.
2.3.1 For Position Loops
The dancer feedback should be scaled so that 0 to 4095 counts corresponds to 0 to
full storage as defined by the parameter
STORAGE (P.857). The midpoint of the dancer
travel should correspond to 2048 counts.
2.3.2 For Current and Tension Loops
The current and tension outer loops are scaled so that 4095 counts corresponds to
rated tension. Rated tension is defined as the tension in the line when the drive is
operating with motor rated torque (motor rated current with rated field current) at full
roll diameter.
Rated tension is not necessarily the maximum line tension for a given process. If rated
tension is greater than the maximum required line tension for your application, then
the current/tension
PI limits should be reduced accordingly.