OM-264234 Page 27
6-5. Preflow And Postflow Adjustment
Postflow will not function without an arc initiation.
Preflow and Postflow times can be configured for the Wire Feeder outputs. These times are global settings (i.e. all memory slots share the same three
preflow and postflow settings; it is not possible to set different postflow times between memory slots).
The unit is shipped in the standard configuration (“Std” appears on the display). In the standard configuration preflow and postflow times are automatic-
ally calculated as follows:
Preflow
For wire processes, the preflow times are fixed at 0.25 seconds which is the default setting in the weld programs.
Postflow
For wire processes, the postflow time is a function of wire feed speed where the minimum time is 8 seconds from 0 to 9.9 mpm (390 ipm) and increases
linearly for 8 seconds at 9.9 mpm (390 ipm) to 16 seconds at 19.8 mpm (780 ipm).
264 175-B
PrE
Std
Std
PSt
To adjust preflow and postflow times, proceed as follows:
1.
Press and hold the Purge button, gas solenoid will open.
2.
Press the Voltage or Wire Feed increase or decrease button, gas solenoid will close.
Unit will display PrE on the Voltage display and preflow setting on the Wire Feed Speed display (Std appears if this is the first time).
3.
Release the Purge button.
4.
Adjust preflow time to desired value by pressing Wire Feed Speed increase or decrease button.
Available selections include Std and numeric values from 0.9 to 10.0 seconds.
If Trigger Select is enabled, there is a minimum preflow time of 0.25 seconds even if programmed for 0.0 seconds.
5.
Press the Voltage increase or decrease button to change from preflow to postflow.
Unit will display PSt on the Voltage display.
6.
Adjust postflow time to desired value by pressing Wire Feed Speed increase or decrease button.
Available selections include Std and numeric values from 0 to 60 seconds.
7.
Press any button to return to the normal display.
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