Hobart Welding Products AIRFORCE OM-928 - Manual (Page 16)

OM-928 Page 12
SECTION 3 – OPERATION
3-1. Controls
2
3
1
OFF
ON
POWER
CUP
TEMP
INPUT VOLTAGE
1 Power Switch
2 Power Light
Use light to tell if unit is energized and ready
to operate. Light goes off if input power is not
with specified range (see trouble light infor-
mation).
3 Trouble Light
Trouble light comes on for the following
conditions:
a If cup is removed from torch (unit
power must be turned off and back
on again)
b If unit overheats
c If input power is not within
specification (93 to 137 vac). If input
power is outside of specified range,
cycle power by placing the power
switch in the off position and back on
again. Check input power if problem
continues.
196 630
3-2. Cutting Speed
The cutting speed curve shows the
recommended maximum cutting
speed capabilities of the power
source and torch for mild steel of
various thickness.
The best cut quality is achieved by
cutting near the chart line. Cutting
below the line (too slow) will result
in excess dross. Cutting above the
line (too fast) will cause blowback
and lack of penetration.
Recommended production cutting speed vs. material thickness is approxi-
mately 10 ipm at 1/8 in (3.2 mm) mild steel thickness at max setting.