Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual - Manual (Page 420)

420 Rockwell Automation Publication 750-PM001J-EN-P - October 2014
Appendix A PowerFlex 755 Control Block Diagrams
Figure 54 - Torque Control - Overview (IM & SPM)
Torque Control –
O
verview
Induction Motor (IM) &
Surface Permanent Magnet Motor (SPM)
1 2 3 4 5 6
B
A
D
C
F
E
H
G
I
Torque
Reference
Scale
and Trim
Spe
ed /
Torque / Position
Mode Sel
ect
+
-
Torque
Limit
Inertia
Adaption
Torque
Limit Select
+
+
Bus
Voltage
Regulator
Torque Step
Spd Reg PI Out
Torq Ref 1 Torq Ref 2
Torq Trim
Speed
Reg
Output
Trim
Inertia Comp
Regen Power Limit
Pos Torque
L
imit
Neg Torque
Limit
Notch Filter
Fi
ltered
Torq
ue Ref
+
+
Select
Drive Voltage and
Current Ratings Brake/Bus Config DC
Bus
Vo
lta
ge
Te
Iq
Calc
Current
Li
mit
Ra
te
Limit
Tor
que
Current
Re
f
Pwr
Te
Calc
Power, T
o
rq
ue, and Current Limit Reference Generation
Current
Limit
Processing
and
Selection
+
Load
Observ
er/
Estimator
Friction Comp
+
PF
755 Rev
_10.a
Page
21a