Rockwell Automation 9329 Drive Application Software Tension Control Gen. Units - Manual (Page 29)

FM – Tension Control
Drive Application Software – page 29 of 52
4.7 TrqMem routine
The torque memory subroutine is used to hold the drive’s torque reference at a constant
value when a roll change is performed on a Center Winder with automatic roll change
support. The base torque memory value is the torque feedback prior to enabling torque
memory. The Torque Memory Routine has two Boost commands. The first is a
TrqMemBoostEnbl and the other is a TrqMemKnifeBoostEnbl. Both of these boosts have
individual settings. Both settings are a percentage multiplier to the base memorized torque
from the drive.
For example, the drive’s torque feedback was varying between 49 to 51 percent. When the
torque memory is enabled the Torque Feedback was 50 percent. The Torque Memory base
value is now set to 50 percent. The TrqMemBoostRf_Pct is set for 10% and the
TrqMemKnifeBoostRf_Pct is set for 50%. When the TrqMemBoostEnbl is set, the Torque
Memory Reference is set to 55% (1.10 * 50% = 55%). When the TqMemKnifeBoostEnbl is
set, the Torque Memory Reference is set to 75% (1.50 * 50% = 75%). Once Torque memory
is disabled the Torque Memory Reference is set equal to the Torque Feedback of the drive.
Input Parameters
Name Type Range Description
1 TrqFb_PU REAL NA Torque Feedback Per Unit
2 DrvTrqRfJLoss_PU REAL NA Torque Reference for inertia & Losses
3 TrqMemBoostEnbl BOOL 0 to 1 Torque Memory Boost Enable
4 TrqMemBoostRf_Pct REAL 10 to 300 Torque Memory Boost Reference
5 TrqMemKnifeBoostEnbl BOOL 0 to 1 Torque Memory Knife Boost Enable
6 TrqMemKnifeBoostRf_Pct REAL 10 to 300
Torque Memory Knife Boost
Reference
Torque
Time
TrqMemBoostEnbl TrqMemKnifeBoostEnbl
Torque Memory Enable