
Rockwell Automation Publication 750-PM001J-EN-P - October 2014 401
PowerFlex 755 Control Block Diagrams Appendix A
Figure 35 - VF, SV Overview
PowerFlex 755
VF (V/Hz), SV Overview
PI Regulator
Speed Contol – Trim Regulator (page: 9)
663
664
VHzSV Spd Reg Kp
VHzSV Spd Reg Ki
131
Active Vel Fdbk
Final Speed Ref
597
623
VHzSV
SpdTrimReg
PID Regulator
Process Control (pages: 26,27)
1086
1087
PID Prop Gain
PID Int Time
1088
PID Deriv Time
1091
PID Fdbk Meter
PID Ref Meter
1090
1084
PID LP
Filter BW
1093
PID Output Meter
1067
PID Ref Sel
1072
PID Fdbk Sel
PID
Reference
Selection
PID
Feedback
Selection
Limit
( PID Output Meter )
Speed Ref
Selection
&
Limits
545
550
572
573
574
575
577
576
Speed Ref A Sel
Speed Ref B Sel
Preset Speed 2
Preset Speed 3
Preset Speed 4
Preset Speed 5
Preset Speed 6
Preset Speed 7
571
Preset Speed 1
608
TrmPct RefA Sel
612
TrmPct RefB Sel
600
Trim Ref A Sel
604
Trim Ref B Sel
592
Selected Spd Ref
PID Output Sel
1079
PID Speed
Exclusive
Selection
Jogging
Selection
556
Jog Speed 1
557
Jog Speed 2
Linear
Ramp &
S Curve
PID Output Sel
1079
PID Speed
Trim
Selection
594
Ramped Spd Ref
Speed Control – Reference (pages: 4-6,8,9)
x
+
Speed
Ref
TrimPct
Ref
Trim
Ref
+
+
V/Hz
Current
Processing
Motor
( Motor Speed Ref )
Slip
Comp
Speed
Trim Reg
Selection
Limit
+
+
Bus/Current
Limiter
(Freq Ramp)
+
+
( Freq Adder )
( Ramp Input Ref )
( Ramp Rate )
1
Output
Frequency
621Slip RPM at FLA
+
-
Droop620
Droop RPM at
FLA
Limit
520
Max Fwd Speed
521
Max Rev Speed
524
Overspeed Limit
PF755 Rev_10.a
Page 2
1
2
3
4
5
6
BA
D
C
FE HG
I
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