WEG SSW06, User Manual

Page: 154 / 195

CHAPTER 7 - PROGRAMMING INFORMATION AND SUGGESTIONS
154
7.1.6.5 Loads with Quadratic
Torque and Linear Speed
Curve (P202=3 and
P120=3 points)
1) Through a steep quadratic load you can set an intermediate point
for improving the linearity of the start speed curve;
2) Through the load curve you can set the torque 20% to 30% higher
than the load torque for all points P121, P123 and P122 and set
P124 as a percent of the time for the intermediate point
3) If no load curves are available, set it initially with a linear torque,
P120=2 points, and afterwards set the intermediate time and
torque.
Figure 7.15 - Starting with quadratic torque control, 3 points, quadratic load
7.1.6.6 Loads with Quadratic
Torque and Higher Initial
Torque (P202=3 and
P120=3 points)
1) With a very steep quadratic load, very high initial torque, you can
set an intermediate point for improving the linearity of the start
speed curve;
2) Through the load curve you can set the torque 20% to 30% higher
than the load torque for all points P121, P123 and P122 and set
P124 as a percent of the time for the intermediate point;
3) If no load curves are available, set it initially with linear torque,
P120=2 points, and afterwards set the intermediate time and
torque.
Figure 7.16
- Starting with quadratic torque control, 3 points, quadratic load with
higher initial torque
Tn(%)
Start
Speed
P124
0
Enable Disable
t(s)
Maximum Time
P121
Tn Nominal
Load Torque
Torque Control
P123
P102
P122
Tn(%)
Start
Speed
P124
0
Enable
Disable
t(s)
Maximum Time
P121
Tn Nominal
Load Torque
Torque Control
P123
P102
P122
P120 =3
P102
Torque
Control
P401
P400
P122
P121
P640
P406
P404
P402
P405
P123
P124
P104 =0
P120 =3
P102
Torque
Control
P401
P400
P122
P121
P640
P406
P404
P402
P405
P123
P124
P104 =0