Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual - Manual (Page 408)

408 Rockwell Automation Publication 750-PM001J-EN-P - October 2014
Appendix A PowerFlex 755 Control Block Diagrams
Figure 42 - Speed Control - Reference (5)
Bus/Current
Limiter
(Freq Ramp)
Velocity
Regulat
o
r
Final Speed Ref
Limit
Max
Fwd/
Rev
Spe
ed Lim
it
Spee
d Fdbk
w
ith Sen
sor
X
VF or
SV
(0-
2,4,5,7,8
)
35
Motor Cntl Mode
1 2 3 4 5 6
B
A
D
C
F
E
H
G
I
597
Torque Ref
Limit
Torque Control
Output
Fr
equ
ency
Motor Co
ntrol Object
Limi
ted
Spe
ed Adder
Limit
(M
ax Fwd
/Rev +
O
verspee
d Lim
it)
Sp
eed Li
mit Pr
evious
Ra
mp
ed Spd
Ref [8I2]
Ramp Rat
e
[8I1]
Ramp Input
[8E2]
X
Interrupt Time
Scaling
Ram
p Rat
e
(M
otor Ctr
l
Int
errupt)
(Hz /
Sec)
Reve
rse
Prevention
Limi
ted
Freq A
dder
(Hz
)
Selec
ted
Freq Ref
(Hz
)
(M
ax
Fw
d/
Rev
+
Overspeed Limit)
Freq Limit
Freq Li
mit Hi
gh (Hz
)
Freq L
imit Lo
w (Hz)
Limit
M
otor
Freq (H
z)
Motor Freq
To Ramp I
n
te
grat
or
[8
G1]
Torque
Reference
Slip RPM
at FLA
X X
Spe
ed to F
req
Sca
ling
620
Droop RPM at FLA
[NP
Spd]
*Po
les
120
Hz
RPM
1
[NP F
req]
1
Iq Feedback (pu)
X
621
[NP Sp
d]
*Poles
120
Hz
RP
M
1
[NP
Freq] 1
Filtered (100 R/S) Iq Feedback (pu)
PI
Limit
[N
P Spd]
*Po
les
12
0
Hz
RPM 1
[NP F
req]
1
VF, SV Speed Regulator
Slip RPM at FLA
62
1
Ramped Spd Ref
594
1
Sp
eed to F
req Sc
aling
Spd Ref After
Final Limit
[7I5] OR [8H4]
Flux V
ector
(3,
6)
Final Speed Ref
597
1
LPF 62
2
Freq I
ntegral
(H
z)
Sli
p
Comp BW
Active Vel
Fdbk
13
1
66
3
664
VHzSV Spd Reg Kp
945
2
At Limit Status
(MaxSpeed Lmt)
945
3
At Li
mit Status
623
VHzSV
SpdTrimReg
Speed Control –
R
eference (5)
VHzSV Spd Reg Ki
X
1.5
[N
P Fr
eq]
[NP
Spd]*P
oles 12
0
Hz
RPM
(O
verSpd
Lmt)
Speed Sens
or Type
O
pen Loop
Sp
eed Fdb
k 1 0
From Fdbk
[3
F2]
To Spd Reg [10A3]
To Fdbk [3B5]
[8
G2]
[3D5], [27E4], [2
7H
3]
***INTERNAL CONDITION ONLY***
Limit
OR
PF
755 Rev
_10.a
Pa
ge 9