Miller Invision 456P Mode D'emploi page 21

3-7. Lift-Arc TIG Procedure For Phoenix 456 CC/CV
SECTION 4 – MAINTENANCE AND TROUBLESHOOTING
4-1. Routine Maintenance
3 Months
Replace
damaged or
unreadable
label.
Repair or
replace cracked
cables and cords.
Clean and
tighten weld
terminals.
OM-186 989 Page 18
1
1 – 2
"Touch"
Seconds
Do NOT Strike Like A Match!
Y Disconnect power
before maintaining.
Repair or
replace
cracked
cables.
2
6 Months
Blow out
inside.
With Mode switch in the Lift-Arc
TIG position, start an arc as fol-
lows:
1 TIG Electrode
2 Workpiece
Touch tungsten electrode to work-
piece at weld start point, hold elec-
trode to workpiece for 1-2 sec-
onds, and slowly lift electrode. An
arc will form when electrode is
lifted.
Normal open-circuit voltage is not
present before tungsten electrode
touches workpiece; only a low
sensing voltage is present be-
tween electrode and workpiece.
The solid-state output contactor
does not energize until after elec-
trode is touching workpiece. This
allows electrode to touch work-
piece without overheating, stick-
ing, or getting contaminated.
Ref. S-156 279
Maintain more often
during severe conditions.
Replace
cracked
torch body.