Tweco A80-A120 CutMaster - Manual (Page 31)

CUTMASTER A80, A120
Manual 0-5119 OPERATION
4-3
3. For Drag cutting (60 Amps and below), adjust
gas pressure from 75 - 95 psi / 5.2 - 6.5 bar
(LED's in center of control panel). Refer to the
Drag Cutting chart for pressure setting details.
DRAG (60 amps or less)
Gas Preassure Settings
Leads Length
SL100
(Hand Torch)
Up to 25'
(7.6 m)
80 psi
5.5 bar
Each Additional
25' (7.6 m)
Ad 5 psi
0.4 bar
Select Current Output Level
1. Place the Function Control Knob in one of
the three operating positions available:
RUN ,
RAPID AUTO RESTART
or LATCH . Gas flow stops.
2. Set the output current to desired amperage
with the Output Current Control Knob.
Pre-flow
With hand or mechanical torch, there will be a .5
second pre-flow of the gas. Pre-flow does not apply
to automation torch use.
Cutting Operation
When the torch leaves the workpiece during cut-
ting operations with the Function Control Knob
in the RUN position, there is a brief delay in re-
starting the pilot arc. With the knob in the RAPID
AUTO RESTART position, when the torch leaves
the workpiece the pilot arc restarts instantly, and
the cutting arc restarts instantly when the pilot
arc contacts the workpiece. (Use the 'Rapid Auto
Restart' position when cutting expanded metal or
gratings, or in gouging or trimming operations
when an uninterrupted restart is desired). And
with the knob in the LATCH position the main
cutting arc will be maintained after the torch
switch is released.
Typical Cutting Speeds
Cutting speeds vary according to torch output
amperage, the type of material being cut, and op-
erator skill. Refer to Section 4T.08 and following
for greater details.
Output current setting or cutting speeds may be
reduced to allow slower cutting when following
a line, or using a template or cutting guide while
still producing cuts of excellent quality.
Postflow
Release the trigger to stop the cutting arc. Gas
continues to flow for approximately 20 seconds.
During post - flow, if the user moves the trigger
release to the rear and presses the trigger, the pilot
arc starts. The main arc transfers to the workpiece
if the torch tip is within transfer distance to the
workpiece.
Shutdown
Turn the ON / OFF switch to OFF
(down). All Power Supply indicators shut OFF.
Unplug the input power cord or disconnect input
power. Power is removed from the system.