Operative mode
Signals for matching with the positioning device
34
Item No.: 099-008225-EWM01
5.10.3 Arc interruption time for TZ-LIBO
For the work process it is desirable that the process runs without interference. However, in poor
conditions it is likely that welding interference will occur, and this results in intermittent signals for the
duration of the process. Depending on the cascade control logic implemented, this results in undesirable
standstills in the positioning device. To counteract this, the interface has a time-controlled recording
feature for arc interruptions. If an interruption is detected, an adjustable time period runs, during which the
I>0 signal sent to the cascade control is stored. After this time elapses, the I>0 signal is retracted, and the
control is provided with a response time (e.g. for a re-start). After max. 5 s elapses, an automatic cut-out
of the process is carried out with an "arc interruption" error message.
The arc interruption monitoring can be shut down by setting TZ-LIBO to the value 0.
The diagram shows the detection of an arc interruption.
Figure 5-4
Legend
Description
A
Short misfire within the detection period
B
Start signal
C
Internal start
D
Start of arc interruption detection
E
Expiry of memory time for I>0 signal
F
Automatic cut-out and arc interruption error message