NORD Drivesystems BU0300 - Manual (Page 140)

NORDAC trio SK 300E Manual
140 Subject to technical alterations BU 0300 EN
12.3 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 allows the possibility of controlling an existing downstream
drive with the reference frequency and to adjust it with the PI controller.
+
-
+
X x1
x2
y
x1*x2
100 %
y=
100 %
0-100 %
+
Reference
setpoint
a) Analog input
(P400=4)
b) Analog function
for digital
input (=28)
Setpoint
a) Analog function for
digital input (=41)
b) Analog input
(P400=15)
c) P412 (0.0-10.0V)
Actual value
a) Analog function
for digital
input (=40)
b) Analog input
(P400=14)
P- Factor P413
I- Factor P414
PI controller
Limitation P415
Internal value for limitation
Start-up time P102
Setpoint ramp
Analog function for
digital input(=42)
Fig.: Flow diagram process controller
Ramp PID controller P416
Setpoint ramp
Process controller application example
M
M
M
M
0V
10V
Frequency inverter
Setpoint of pilot machine AIN 1
Enable right Dig. 1
Actual position CR Dig. 2
Nominal position CR
via parameter P412
Controlled drive via CR Compensating roller = CR (dancer roller) Pilot machine
Actual
CR position
via
potentiometer
0-10V
Centre 5V
nominal
position
f
t
Setpoint of
pilot machine
Controller
limit P415 in
% of setpoint
Controller
limit P415