Process Controller; Process Controller Application Example - nord NORDAC SK 5xxE Series Manual

NORDAC SK 5xxE 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
Reference
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

8.2.1 Process controller application example

Controlled drive via CR
M
M
Setpoint of pilot machine
Enabled right
Actual position CR
Nominal position CR
via parameter P412
146
P-Factor P413
I-Factor P414
+
-
PI controller
Compensating roller = CR (dancer roller)
Actual
position
of CR via
potentiometer
0-10V
Frequency inverter
AIN 1
DIN 1
AIN 2
Subject to technical alterations
Min. limitation
P466
x1
X
x2
y
x1*x2
y=
100 %
Max. limitation
P415
Fig.: Flow diagram process controller
0V
Centre 5V
nominal
position
10V
f
Setpoint of
pilot machine
Acceleration
time P102
+ +
Setpoint ramp
Lead
Analog input
(P400 = 16)
Pilot machine
M
M
Controller
limit P415 in
% of setpoint
Controller
limit P415
t
BU 0500 GB