The offset value for the guiding setpoint is used for web centerline-guiding with CCD camera when the CCD camera is mounted in the machine off-center, but the material web should be guided through the machine in the middle.
Off-center assembly of the CCD camera
Problem
If the value "0" is set on the controller for the guiding setpoint, the material web will be guided to the center of the camera measuring range. Due to the off-center assembly of the CCD camera, a difference (offset) results between the center of the camera measuring range and the machine center. This difference results in that with the set guiding setpoint "0", the material web does not run in the middle of the machine.
Objective
If the guiding setpoint on the controller is set to the value "0", the material web should run exactly in the middle of the machine.
Solution
On the controller, an offset value is entered that corresponds with the difference between the center of the camera measuring range and the machine center.
Procedure
»The material web is pulled into the machine.
Activate the Web center-line guiding mode.
Activate Automatic operating mode.
Move the guiding setpoint of the material web using both arrow keys in such a manner that the web runs exactly in the middle of the machine.
A value unequal "0" (in the example "-500") is shown for the guiding setpoint in the display of the controller.
Determining the offset value for the guiding setpoint
①
Position of the machine center
②
Position of the center of the camera measuring range
③
Set guiding setpoint (≙ offset value)
The value ③ displayed corresponds with the offset between the center of the camera measuring range and the machine center.
Enter the displayed value for the guiding setpoint (in the example "-500") as offset value on the controller (parameter setpoint offs. Cam M12 of the public parameter list 0, see Parameter List 0). Note the prefix sign!
Activate the offset value on the controller (parameter setp-offs. Cam M12 act. = 1).
After activating the offset value, the controller uses the value entered to compensate the deviation between the center of the camera measuring range and the machine center. If the guiding setpoint is set to the value "0", the material web runs exactly through the middle of the machine.
