15
16. AC-safety
A green LED indicates that the AC safety circuit
is activated. The AC safety circuit ensures that
there is no AC voltage on the torch when the
machine is on no-load voltage.
17. Preheating of TIG-electrodes
Before the AC cycle is initiated, the following
adjustment should be made to set the positive
ignition period. Traditionally, thin TIG electrodes
require a low positive cycle and thick electrodes
require a high positive cycle.
If ignition problems are experienced:
If the electrode burns away rapidly or if a bulb is
formed on the tip of the electrode during ignition,
the preheating should be decreased. If there are
problems with arc ignition, the preheating period
should be increased.
The following values are recommended:
Electrode size Preheating
< 1.0 mm 0%
1.6 mm 20%
2.4 mm 40%
3.2 mm 60%
> 4.0 mm 80%
18. AC test
This trigger is used for testing of the AC safety
circuit.
When the machine is set for MMA welding with
AC, the LED (AC safety) lights continuously
when the machine is on no-load voltage. If the
trigger is activated, the LED will go out and
remain so as long as the trigger is activated.
Should this not be the case, an authorised
service technician should be called.
19. Gas connection
20. Plug for torch button, interactive control and
coding of air/water-cooling.
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