nord NORDAC PRO SK 5 E-111 CP Series, User Manual

Page: 191 / 218

8 Additional information
BU 0505 EN-3021 191
8.2 Process controller
The process controller is a PI controller which can be used to limit the controller output. In addition, the
output is scaled as a percentage of a master setpoint. This provides the option of controlling any
downstream drives with the master setpoint and readjusting using the PI controller.
+
-
X
x1
x2
y
x1*x2
y=
100 %
+
+
Fig. 15: Process controller flow diagram
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8.2.1 Process controller application example
M
M
M
M
0V
10V
Master
setpoint
Analog input 1
(P400=4)
or
Analog input 2
Setpoint
P412 = 0.0-10.0V
Controlled drive via CR
Actual value
Analog input 1
(P400=14)
or
Analog input 2
Compensating roller = CR (dancer roller)
Ramp PID controller P416
Pilot machine
P-Factor P413
I-Factor P414
Actual
position of CR
via
potentiometer
0 – 10V
PI controller
Centre = 5V
nominal
position
Min. limitation
P466
Lead
Analog input 1
(P400 = 16)
Start-up time P102
Setpoint ramp
Max. limitation
P415