Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual - Manual (Page 402)

402 Rockwell Automation Publication 750-PM001J-EN-P - October 2014
Appendix A PowerFlex 755 Control Block Diagrams
Figure 36 - Speed/Position Feedback
1 2 3 4 5 6
B
A
D
C
F
E
H
G
I
Speed/Posit Fdbk
125 128
Primary
Velocity Fdbk
Processin
g
Alternate
Velocity Fdbk
Processin
g
M
otor Sim
ulator
V
irtual E
ncoder
Open
Loop
Virtual Encoder
Au
x Veloc
ity
Fdbk
Proc
ess
ing
Primary
Velocity Fdbk
Processin
g
Alternate
Velocity Fdbk
Processin
g
709
De
rivat
ive d dt
De
rivat
ive d dt
0 1
Motor Accerlation
Fdbk
To Inerti
a
Adaption, Load O
bse
rver/Estima
to
r
[25G4], [26G
4]
12
7
130
Pri Vel Feedback Alt Vel Feedback
Pri Vel Fdbk Sel Alt Vel
Fdbk Sel
0 1
IA LdO
bs Delay
847
Psn Fdbk
Spd Options Cntl (Auto Tach SW
)
Fdbk L
oss
D
etect
93
6
5
635
7
Drive St
at
us 2
(F
dbkLo
ss SwO
)
Display Filtering
3
Mt
r Vel Fdbk
13
1
Active Vel
Fdbk
To S
p
d Reg
[9
B4
], [1
0A3], [24a
B3], [24
b B3
]
To Posit Ref, Posit Reg [11C5]
, [12A
4]
, [
1
2A5]
13
5
Psn Fdbk
Sel
132
Aux Vel Fdbk Sel
126
Pri Vel FdbkFl
tr
129
Alt
Ve
l Fdb
kFlt
r
597
Final Speed Ref
76
Total Inertia
141
Virtua
l Enc EPR
690
Limite
d Tr
q Ref
1
Output Frequency
5
Torque Cur Fdbk
13
7
Op
en Loop Fdbk
621
Slip RPM at FLA
141
Vi
rtual Enc EPR
138
Simulator Fdbk
13
4
Au
x Vel Fe
edb
ack
133
Aux Vel FdbkFltr
Pri Vel
Fdbk
Sour
ce
Alt
Ve
l
Fdbk
Source
Psn Fd
bk
Source
Aux Vel
Fdbk
Sour
ce
Param
eter
Select
ion
Param
eter
Select
ion
P
arame
ter
Selectio
n
P
arame
ter
Selectio
n
From Spd Ref
[9D3]
From Torq Ctrl Current
[24a E2], [24b E2]
[9
I4
]
To Spd Ref [5A3]
[25H2], [26H2]
VF or
SV &
O
pen Loop
Control Mode/ Fe
ed
back Mode
***INTERNAL CONDITION ONLY***
PF
755 Rev
_10.a
Pa
ge 3