Miller Electric OM-225A - Manual (Page 17)

OM-225 Page 15
3-2. Sequence Of Operation
Put On Personal
Safety
Equipment
Install &
Connect
Equipment
EXAMPLE Of Cutting Operation
ST-801 400-A
Press trigger. Pilot arc starts.
Postflow continues for approx. 20 to 30
seconds after releasing trigger; cutting arc
can be instantly restarted during postflow
by pressing trigger.
Check Torch Tip,
Electrode, And
Retaining Cup
Check Gas/Air
Pressure
Set
Controls
Begin
Cutting
Turn On
Power Source
The pilot arc starts immediately when trigger is pressed. If cutting is
not established within 5 seconds after trigger is pressed, pilot arc
goes out and trigger must be released and pressed again.
Place drag shield on edge of metal, or allow
correct standoff distance – approximately 1/8
in (3 mm). For gouging, use 1/8 to 1/4 in (3 - 6
mm) standoff. Hold tip at about a 45
°
angle.
Be sure to use gouging consumables.
Do not clean torch by hitting it against a
hard surface. Hitting hard surfaces can
damage torch parts and stop proper opera-
tion. Inspect shield cup, tip, and electrode for
wear before cutting or whenever cutting
speed has been significantly reduced (see
torch Owner’s Manual). Do not operate
torch without a tip or electrode in place.
After cutting arc starts, slowly
start moving torch across metal.
Adjust torch speed so
sparks go thru metal and
out bottom of cut.
Pause briefly at end of
cut before releasing trigger.
If arc goes out while cutting, the arc outage detction circuit will
automatically restart the arc. There is no need to manually retrigger
the torch. This is useful for cutting perforated metal.