OM-253 906 Page 63
6-10. Preflow And Postflow Adjustment
. Postflow will not function without an arc initiation.
Preflow and Postflow times can be configured for each of the TIG, Wire Feeder Left and Wire Feeder Right 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
Preflow is only active when in the HF start mode. For TIG, the preflow time is set to 0.1 seconds when in the standard configuration.
For wire processes, the preflow times are fixed at 0.25 seconds which is the default setting in the weld programs.
Postflow
For TIG, the postflow time is a function of output current where the minimum time is 8 seconds from 0 to 175 amps and increases linearly from 8 seconds
at 175 amps to 16 seconds at 350 amps.
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 and increases linearly for
8 seconds at 9.9 mpm to 16 seconds at 19.8 mpm.
252 620-C
PrE
Std Std
PSt
To adjust preflow and postflow times, proceed as follows:
1. Select desired output: TIG, LEFT or RIGHT.
2. Press and hold the Purge button, gas solenoid will open.
3. Rotate the Voltage or Wire Feed Speed knob, 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).
4. Release the Purge button.
5. Adjust preflow time to desired value by rotate the Wire Feed Speed knob.
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.
6. Rotate the Voltage knob to change from preflow to postflow.
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