Function

With tear-off detection activated, in automatic mode the sensor value of the CCD camera is read-in at a pre-set time interval (scanning cycle). If a tear on the web edge occurs in the measuring range of the CCD camera, the sensor value read in jumps suddenly. If the change of the sensor value exceeds from one scanning cycle to the next by a determined minimum value, the change is detected as tear-off and the web guiding system is blocked automatically for the pre-selected blocking time. It is possible to deactivate the tear-off detection after the detection of a tear-off for a pre-selected period (blocking hold time).

Function principle of the tear-off detection

With the following parameters of the public parameter list (parameter list 0), you can activate the tear-off detection and adapt the function to your individual application.

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Function

Parameter

Parameter value

Description

Activate tear-off detection

tear off active

0 (OFF)

Function deactivated

1 (ON)

Function activated

Min. change of the sensor value per scanning cycle so that a tear-off is detected

tear off value digits

depending on the sensor

Factory setting: 0 pixel

Scanning cycle
(time interval for reading in the sensor values)

tear off probe time ms

≥ 5 ms

Factory setting: 5 ms

Blocking time
(blocking period)

tear off lock ms

 

Factory settings: 0 ms

Blocking hold time
(time from detecting the end of a tear until a new tear can be detected)

tear off inhibit ms

 

Factory settings: 0 ms

To select the public parameter list (parameter list 0) see Extended Device Settings.