Forced Disconnection - ESAB Aristotig255 AC/DC DTE 255 Instruction Manual

GB
6.6.3 Setting direct and alternating current
Direct current:
Set switch (4) to the position for direct current with negative polarity.
S
If pulsing has been selected:
S Set the pulse current value using potentiometer (8).
S Set the background current in per cent of the pulse current value using
potentiometer (9).
S Set the pulse frequency using potentiometer (12).
Set the time relation between pulse and background current using
S
potentiometer (13).
Alternating current:
Two different types of alternating current can be set over switch (4):
S A sine−wave type, characterised by low noise and a soft arc. Effective when low
frequencies are used!
S A square−wave type, characterised by a hard and stable arc, resulting in a
somewhat higher noise level.
The arc is always struck by way of direct current which is then automatically
switched over to alternating current.
Increased alternating current frequency gives a concentrated and stable arc, suitable
above all when a low amperage is used and when welding in extremely thin plate.
The displacement (balance) of the half−wave in positive direction leads to increased
cleaning, and in negative direction to increased penetration.
(Turn potentiometer (13) more to the right for increased penetration!)
6.7

Forced disconnection

If the torch trigger or the foot−operated remote control unit has been activated and
no arc has been generated, the open circuit voltage is automatically disconnected
after 2 seconds. The same applies in the event of an arc interruption.
This function protects from:
Uncontrolled arc strike
S
Material damage
S
Shielding gas drop−out
S
Accidents
S
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