ESAB PCM-875, Instruction Manual

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SECTION 3 OPERATION
17
Figure 3-1. PCM-875 Controls
E. When ending a cut, the torch switch should be
released (press and release if using trigger LOCK
mode) and lifted off the workpiece just before the
end of the cut. This is to prevent the high frequency
from reigniting after cutting arc extinguishes and
causing damage to the nozzle (double arcing).
F. For rapid re-starts, such as grate or heavy mesh
cutting, do not release the torch switch. In the
postflow mode, the arc can be re-started immedi-
ately by depressing the torch switch. This avoids
the 2-second preflow portion of the cutting cycle.
REAR VIEW
AIR REGULATOR
CONTROL KNOB
FAULT LIGHT
(AMBER)
POWER LIGHT
(WHITE)
AIR
PRESSURE
GAUGE
AIR TEST
SWITCH
TRIGGER LOCK
SWITCH
CURRENT
CONTROL
KNOB
FUSE (15A)
POWER ON-OFF
(I-O) SWITCH &
CIRCUIT BREAKER
FUSE (3A)
Figure 3-2. Recommended Torch Angle of 5° to 15°
NOTE: When replacing the nozzle, always inspect the
electrode for wear. If less than 19/32" of electrode
shaft is remaining, replace the electrode. If the
electrode is used beyond this recommended wear
limit, damage to the torch and power source may
occur. Nozzle life is also greatly reduced when
using the electrode below the recommended
limit. Refer to Figure 3-3.
Figure 3-3. Electrode Wear Limit
19/32"
3.3.1. Drag Cutting with the PT-27/PCM-875 System
If drag cutting is desired, the 15 amp pilot arc fuse located
on the rear panel must be removed. This converts pilot arc
starting to high frequency starting allowing you to cut by
dragging the torch nozzle on the workpiece. Cutting
thickness should not exceed 3/8" for drag cutting.
(15.1 mm)
ELECTRODE
REPLACE ELECTRODE BEFORE
LENGTH BECOMES SHORTER
THAN 19/32 INCH (15.1 MM)