ABB COMMANDER C355 - A6 Cascade Controller with Feedforward (Template 13)

120
…APPENDIX A – CONTROL TEMPLATES
LSPt
RSPt
I/P3 x
rAtO
+
bIAS
PID
Control Loop
PID O/P
CSPt
DV x FFGN
+ FFBS
I/P3
L
L
R
PV
I/P1
Manual Output
I/P2
OP1
Remote Set Point Input
Process Variable Input
Feedforward Disturbance Variable Input
•1 Template 10 only
•2 Can be set to multiplication using the PC configurator
•3 Feedforward operation is disabled by setting '
FFGN
' to '
OFF
'
Set Point
Ramp
•1
∑
•2
DV
Local Set Point
PV–
CSPt
•3
FFGN = 0FF
Profile
Set Point
A4 Single Loop Controller with Feedforward (Templates 9 and 10)
Single Loop Controller with Feedforward. A disturbance variable is weighted by the feedforward gain (
FFGn
) and the feedforward bias (
FFbs
)
values and then added to the controller output value. Multiplication of the feedforward signal with the control output (instead
of addition) can be selected
using the configurator. When in Manual mode, the PID output tracks the difference between the control output value and the feed
forward signal, to ensure
bumpless transfer back to auto mode.