Operating Manual CMGZ434
18
9.5
Inputting the reference value
The
material tension
reference value can be inputted by the operating panel resp. interface,
or by the analog input:
reference input by operating panel resp. interface
•
Set parameter
reference internal / external
to
internal
•
Press „REFERENCE“ key in the main operating menu for 3 seconds (refer to fig. 11).
Input new reference value using the keyboard. Quit change mode and save the new
reference in the EEPROM by using the
↵
key. (If change mode is quit by using
„HOME“ key, the new reference is taken only into RAM and will be lost while power-
off or changing a parameter.)
•
Alternatively: Send reference value by interface to the electronic unit (refer to „10.
Serial interface“).
reference input by analog input
•
Set parameter
reference internal / external
to
external
•
Apply 0...10V source to the analog input (terminals z2 / d2 resp. 10 / 11)
•
Set parameter
scale ref. input
to the needed reference value range (refer to „10.
Parametrization)
9.6
Definition of control parameters
Experimental determination of control parameters (recommended)
If the behaviour of the control loop is
unknown, tuning is done by means of a
systematic approach (fig. 14):
•
Set parameter
Derivative D
to 0s (only
if PID configuration is used)
•
Set parameter
Integral I
very high
(100.00s)
•
Set parameter
Proportional P
very
small (for ex. 1.00)
•
Enable controller
•
If control loop is not oscillating:
Increase
Proportional P
•
If control loop is oscillating: decrease
Proportional P
•
Repeat this procedure until the control loop is stable and nearly oscillating. The
controller can remain enabled; the controller parameters may be changed during
automatic operation.
•
If the control loop is running stable with the „P“ component, the
Integral I
can be
decreased until the steady error disappears.
•
If the
Integral I
is too small, the control loop will become unstable again.
•
(Only using PID configuration): Increase
Derivative D
carefully until the controller is
nearly oscillating.
•
If the
Derivative D
is too high, the control loop will become unstable again.
•
If the control loop is running stable, the parameters
Proportional P
,
Integral I
and
Derivative D
should be noted for eventually re-setup.
fig. 14: Transient effect of the control
system
C431013e
