
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 – Overview
Induction Motor (IM) &
Surface Permanent Magnet Motor (SPM)
1
2
3
4
5
6
BA
D
C
FE HG
I
Torque
Reference
Scale
and
Trim
Speed /
Torque /
Position
Mode
Select
+
-
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 Limit
Neg Torque Limit
Notch
Filter
Filtered
Torque Ref
+
+
Select
Drive Voltage and
Current Ratings
Brake/Bus Config
DC Bus Voltage
Te
Iq
Calc
Current
Limit
Rate
Limit
Torque
Current
Ref
Pwr
Te
Calc
Power, Torque, and Current Limit Reference Generation
Current
Limit
Processing
and
Selection
+
Load
Observer/
Estimator
Friction
Comp
+
PF755 Rev_10.a
Page 21a
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