Rockwell Automation 20D PowerFlex 700S with Phase I Control Reference Manual - Manual (Page 152)

152 Rockwell Automation Publication PFLEX-RM002D-EN-E - August 2013
Chapter 1 Detail Drive Configuration and Operation
Speed/Torque Select The Speed/Torque Mode Select parameter is used to choose the operating mode
for the drive. The drive can be programmed to operate as a velocity regulator, a
torque regulator, or a combination of the two. See the firmware flowchart shown
in
Figure 34 on page 152Figure 34 - .
Figure 34 - Firmware Flowchart
As shown in Figure 34 , parameter 110 [Spd/Trq Mode Sel], is used to select the
mode of operation. Zero torque current is allowed when set to zero (0).
Set to a value of 1, the drive and motor are operated in speed mode. The torque
command changes as needed to maintain the desired speed.
Set [Spd/Trq Mode Sel] to a value of two (2) for torque mode. In torque
regulation mode, the drive controls the desired motor torque. The motor speed is
the result of torque command and load present at the motor shaft.
Min and Max mode are selected by values three (3) and four (4) respectively.
These modes offer a combination of speed and torque operation. The algebraic
minimum or maximum of speed/torque will be the operating point for the Min
and Max modes. The drive automatically switches from speed to torque mode (or
from torque to speed) based on the dynamics of the motor/load.
The Min mode is typically used with positive torque and forward speed
operation, the minimum of the two being closest to zero. The Max mode is
opposite, typically used with reverse speed and negative torque, the maximum
being the least negative (closest to zero).
Sum mode is selected when [Spd/Trq Mode Sel] is set to a value of 5. This mode
allows an external torque command to be added to the speed regulator output
when desired.
Speed Regulation Mode
Operating as a speed regulator is the most common and simplest mode to set up.
Examples of speed regulated applications are blowers, conveyors, feeders, pumps,
saws, and tools.
59
302
145
Min
Max
Abs
Min
0
1
2
3
4
5
6
111
X
112
113
114
115
Spd Reg PI Out
[3H4]
FricComp TorqAdd
[2H3]
Inertia Torq Add
[2H4]
Torque Ref 1
Torq Ref1 Div
Torque Ref 2
Torq Ref2 Multi
Torque Trim
Spd/Torq ModeSel
0
0
1
157 10
116 Torque Step
Logic Ctrl State
(Forced Spd)
from Speed Control
/
+
+
+
+
+
+
+
+
+
+
110