Design and function
Plasma welding
099-004854-EW501
19.02.2014
5.7.8 Arc ignition
The pilot arc is activated/deactivated by pressing the "Pilot arc on/off" push-button.
After activating the pilot arc, the pre-set gas pre-flow time runs, the pilot arc current ignites without
workpiece contact between the electrode and nozzle, and the control lamp in the push-button illuminates.
Oxidation of the tungsten electrode!
To protect the tungsten electrode against oxidation carry out the following actions
before switching off the power source:
• Switch off the pilot arc and wait for the gas post flow time to elapse!
• Do not switch off the machine while the arc is still burning!
On delivery, the Pilot arc current on the machine is preset to 10A.
The majority of applications are covered by this current setting.
If required, the Pilot arc current can be adjusted individually using the PC300.NET
software (5A to 25A).
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