Rockwell Automation 20A PowerFlex 70EC/700VC - Manual (Page 109)

Speed/Torque Mode 105
Speed Feedback Filter
[Fdbk Filter Select] determines the type of filter to use for the speed feedback. The
filter is used to filter out high frequency signals (noise) by reducing the gain at high
frequencies. The selections for the filter are:
Speed/Torque Mode The drive can be programmed to operate as a velocity regulator, a torque regulator,
or a combination of the two as follows.
[Speed/Torque Mod], parameter 88 is used to select the mode of operation. Zero
torque current is allowed when set to “0.” When set to a “1,” the drive/motor is
operated in speed mode. The torque command changes as needed to maintain the
desired speed. A value of “2” selects torque mode. In torque regulation mode, the
drive controls the desired motor torque. The motor speed will be a result of the
torque command and load present at the motor shaft. Min and Max mode are
selected by values 3 and 4, respectively. These two modes offer a combination of
speed and torque operation. The algebraic minimum or maximum of speed/torque
will be the operating point. The drive will automatically switch from speed to
torque mode (or from torque to speed) based on the dynamics of the motor/load.
Description To select this type of filter . . .
Select this
value . . .
No filter 0
A light 35/49 radian feedback filter 1
A heavy 20/40 radian feedback filter 2
700VC ONLY
Gain
0 db
Rad/Sec
Gain
0 db
-6 db
Rad/Sec 49 35
Gain
0 db
-12 db
Rad/Sec 40 20
70EC 700VC 700H
✔ ✔
Scale
429
428
124
430
0
0
1
2
3
4
5
6
/
x
+
Torq Ref A Div
Speed/Torque Mod
Torq Ref B Mult
= 700VC Only
427
88
Min
Max
+
abs
Min
Prof
7
Torque Ref A Hi
Torque Ref A Lo
Torque Ref A Sel
Scale
433
432
434
431
Torque Ref B Hi
Torque Ref B Lo
Torque Ref B Sel
From Torque Trim
1
0
0
08 Process PI Config
From Speed Regulator