NORD Drivesystems BU0750 - Manual (Page 146)

NORDAC SK 750E Manual
146 Subject to technical amendments BU 0750 GB-3311
10.3 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 provides the option of controlling any downstream drives
with the master setpoint and readjusting using the PI controller.
+
-
+
X
x1
x2
y
x1*x2
100 %
y=
100 %
0-100 %
+
Master setpoint
a) Analog input
(P400=4)
b) Analog function
for DIG IN (=28)
Setpoint
a) Analog function
for DIG IN (=41)
b) Analog input
(P400=15)
c) P412 (0.0-10.0V)
Actual value
a) Analog function
for DIG IN (=40)
b) Analog input
(P400=14)
P factor P413
I factor P414
Limitation P415
Internal value for calculation
Start-up time P102
Analog func. for
dig. input
Func. 42
PI controller
Setpoint ramp
Setpoint ramp
Ramp PID controller
P416
Fig.: Process controller flow diagram
10.3.1 Process controller application example
M
M
M
M
0V
10V
AIN 1 / AIN 2
DIG IN 1
DIG IN 2
Setpoint of pilot machine
Enabled right
Nominal position CR
via parameter P412
Actual position CR
Frequency inverter f
t
Setpoint of
pilot machine
Controller
limit P415 in
% of setpoint
Controller
limit P415
Controlled drive via CR Compensating roller = CR (dancer roller) Pilot machine
Actual
CR position
via
Poti 0 -10V
Centre 5V
nominal
position