5.11.3 Arc Interruption Time: Tz-Libo; 5.11.4 Return Time, Tz-Reset - EWM RINT X12 Operating Instructions Manual

5.11.3 Arc interruption time: 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.
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

5.11.4 Return time, TZ-Reset

Most positioning equipment uses the I>0 signal to optimise the cycle time to trigger the positioning
equipment after the process. This often makes it more difficult to reliably detect sticking. An adjustable
time TZ-RESET can be used to set the period after which the I>0 signal is reset after the process is shut
down.
If both TZ-SET and TZ-RESET are set to the value 0, the original process signal I>0 is permitted
through to the higher level control unfiltered. This can be desirable if the control has its own
process signal monitoring
Parameters TZ-SET and TZ-RESET are currently only available for Phoenix / alpha Q systems. In
Tetrix / forceTig systems, these values are specified as follows:
•
TZ-SET = 30 ms
•
TZ-RESET = 30 ms
099-000769-EW501
29.06.2015
Design and function
Signals for matching with the positioning device
Figure 5-5
33