NORDAC SK 5xxE Manual
146
Subject to technical alterations
BU 0500 GB
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.: Flow diagram process controller
8.2.1 Process controller application example
M
M
M
M
0V
10V
Frequency inverter
Setpoint of pilot machine
AIN 1
Enabled right
DIN 1
Actual position CR
AIN 2
Nominal position CR
via parameter P412
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
Ramp PID controller P416
P-Factor P413
I-Factor P414
PI controller
Min. limitation
P466
Lead
Analog input
(P400 = 16)
Acceleration
time P102
Setpoint ramp
Max. limitation
P415
Controlled drive via CR
Compensating roller = CR (dancer roller)
Pilot machine
Actual
position
of CR via
potentiometer
0-10V
Centre 5V
nominal
position
f
t
Setpoint of
pilot machine
Controller
limit P415 in
% of setpoint
Controller
limit P415
