Operating Manual CMGZ434
20
9.8
Automatic operation
State „Controller disabled“
After power on, the controller is disabled. Its output value is 0V, 0mA or 4mA
(depending on setting of parameter
Output config.
)
Enable controller
The controller will be enabled by digital input „Controller enabled“ or by serial interface.
The controller then begins to control the
material tension
and to hold it at the level of the
reference value, and the digital output „Controller ok“ will be activated.
Change of control parameters while automatic operation
The control parameters
P0...P3 / I0...I3 / D0...D3, Influence of PI
and
PID-configuration
can be changed while the controller being enabled. Setting is done as written in „11.3
Description of the parameters“. The new values are taken for the control loop when
parameter mode is quit.
Change of reference value while automatic operation
The reference value can be changed while automatic operation as described under „9.5
Inputting the reference value“.
Disable controller
To terminate controlling after stopping the machine, the controller has to be disabled. If
enabling was done by interface, disabling must be done also by interface. After disabling
the controller, the output value will be set to zero immediately and the digital output
„Controller ok“ will be cancelled.
Notice
If the controller is disabled while the material is running, the drive unit will stop
immediately. This may cause material crack. Therefore, the controller should be disabled
only if the machine is no longer running.
9.9
Setup of line speed overlay
If the control unit is operated with line speed overlay, a line speed signal is used to build
the output value. The control unit adapts the signal referring to the diameter proportion
between tacho roller and drive roller. The hereby calculated value is taken and the
percentage quota of the PI resp. PID controller is overlayed. The sum will be the output
value. Therefore the controller now is only responsible for the non-synchronous part.
This will increase controlling stability.
The parameters for line speed overlay may be calculated. But often the referring values of
the machine are unknown. Therefore the experimental setup of line speed overlay is listed
below:
Transmission of line speed signal
To transmit the actual line speed to the electronic unit, an analog signal 0...10V (from a
tacho generator or other source) is fed to the analog input (terminals d6 / d8 resp. 7 / 8;
refer to „8.4 Mounting the tacho generator“)
