Operative mode
Signals for matching with the positioning device
Item No.: 099-008225-EWM01
33
5.10 Signals for matching with the positioning device
Experience has shown that the signal matching between the welding power source and the positioning
device is very important. If interference occurs suddenly due to a loss of signal (e.g. arc interruption), or if
intermittent signals occur, the positioning device can itself enter an error status condition. Often it is
difficult to move the positioning device back to the basic position.
For this reason, multiple parameters for improved matching have been introduced specifically for the
process start phase and for the process in progress.
5.10.1 Ignition time: TZ-Zünd
Detecting a failed ignition process is very important during the process start phase (especially with
tandem processes with more than one power source).
The ignition phase is evaluated using an adjustable ignition time. A successful ignition process is
detected if a stable flow of current occurs for more than the set time period after ignition. The I>0 signal is
saved in this phase. However, if there is no ignition process for the duration of the failed ignition time, an
ignition error is issued to the cascade control. The process will be shut down automatically.
The ignition monitoring can be shut off by setting TZ-ZUND to the value 0.
5.10.2 TZ-Set
To specify the duration of the stable arc burn time, the parameter TZ-Set was defined. If the arc burns
stably in the ignition phase for this period, the signal I>0 is stored.
Figure 5-3
Legend
Description
A
Start signal
B
Internal start
C
Ignition time elapse
D
Ignition error message
E
Automatic cut-out
