Process Controller; Process Controller Application Example; Fig. 15: Process Controller Flow Diagram - nord NORDAC PRO SK 500E Series User Manual

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.
Ramp PID controller P416
Master
setpoint
Analog input 1
(P400=4)
or
Analog input 2
Setpoint
P412 = 0.0-10.0V
Actual value
Analog input 1
(P400=14)
or
Analog input 2

Fig. 15: Process controller flow diagram

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8.2.1

Process controller application example

Controlled drive via CR
M
M
position of CR
potentiometer
0 – 10V
BU 0505 EN-3021
P-Factor P413
I-Factor P414
+
-
PI controller
Compensating roller = CR (dancer roller)
0V
Actual
10V
via
8 Additional information
Min. limitation
P466
x1
X
x2
y
x1*x2
y=
100 %
Max. limitation
P415
Pilot machine
Centre = 5V
nominal
position
Start-up time P102
+ +
Setpoint ramp
Lead
Analog input 1
(P400 = 16)
M
M
191