ESAB ESP-150 Manuel D'instruction page 148

SECTION 4
Never, under any circumstances, op-
erate the power supply with the
cover removed. In addition to the
safety hazard, improper cooling may
cause damage to internal compo-
nents. Keep side panels closed
when unit is energized. Also make
sure you are adequately protected
before you start cutting — protec-
tive helmet and gloves should always
be worn. Refer to page 2 for addi-
tional operating precautions.
Voltage is available at the POWER On-
Off switch on the hinged top cover
when voltage is applied to the input
terminal board even when the POWER
switch is OFF.
Before making any adjustments or
performing any maintenance on the
torch, make sure the power to the
torch is shut off.
ARC RAYS CAN BURN EYES AND SKIN,
NOISE CAN DAMAGE HEARING!
Wear eye, ear, and body protection.
Wear the usual protective gloves,
clothing, and helmet. Helmet with filter
lens shade No. 6 or 7 should provide
adequate protection for your eyes.
Never touch any parts forward of
the torch handle (tip, heat shield,
electrode, etc.) unless the Power
switch is in the OFF position.
ESP-150 ADJUSTMENTS
1. Slowly open each gas cylinder valve.
2. Place the ESP-150 GAS MODE and POWER switches in the OPERATE
and OFF positions.
3. Place the primary (wall) switch in the ON position.
4. Place POWER to READY position. POWER light should light up. Fan should
be running.
5. With GAS MODE switch in START/SHIELD position gas solenoid valves should
be open. Adjust the START gas and SHIELD regulators to deliver the pres-
sures specified in Table 2.
Place switch in CUT position and adjust CUT Gas regulator to deliver pres-
sures specified in Table 2.
6. Allow the gases to flow for a few minutes. This should remove any condensa-
tion that may have accumulated during shut down.
7. Place the GAS MODE switch in the OPERATE position. This will shut off the
gas flows.
8. Adjust CURRENT CONTROL knob to approximate cutting current desired.
OPERATION
1. Position the torch on the workpiece by resting the heatshield on the edge of
the workpiece where you intend to start the cut.
2. Lower your protective helmet and then lift the torch about 1/8-in. above the
workpiece.
3. Push down on the torch switch button mounted on the torch handle. Pilot arc
contactor and high frequency will energize, and gas will start flowing. Two
seconds later, the main contactor will come on. The pilot arc should then
transfer to the cutting arc.
NOTE: If cutting arc does not start within 6 seconds, the pilot arc will shut off.
Release torch switch. Check to be sure gas pressures are adequate,
work cable is firmly connected to workpiece, torch was about 1/8 to 1/4-
in. above workpiece, etc. Then start from step 1 again.
4. For manual and mechanized cutting, maintain a standoff (torch-to-work dis-
tance) of about 3/8-in. (stand off guide, P/N 36648, provides that distance).
Keep the torch head vertical, and move it at a rate that produces the desired
cut quality. The cutting should produce a straight fine spray of molten metal
emitting from beneath the workpiece as illustrated in Fig. 16. For mecha-
nized cutting, see Table 2 or 3 for recommended cutting speed range.
5. If cutting arc is lost during a cut, the pilot arc will immediately reignite as long
as the torch switch is depressed. You then have about 6 seconds to move the
torch close enough to work to re-establish the cutting arc.
142
OPERATION