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Volts/Peak
Control And
Pilot Light
3-3. CONTACTOR SWITCH (Figure 3-1)
WARNING: ELECTRIC SHOCK can kill.
Do not touch live electrical parts.
Do not touch the weld output terminals when
the contactor is energized.
Do not touch electrode holder (or gun wire)
and work clamp at the same time.
If the Remote Control CONTACTOR switch is in the ON
position, open-circuit voltage will be present at the out-
put terminals whenever the welding power source
POWER switch ON button is depressed.
IMPORTANT: Although the term CONT ACT OR is used
on the nameplate and throughout this manual, the weld
output is not switched on or off by a physical secondary
contactor; rather , the weld output is controlled by solid-
state circuitry in the welding power source.
If contactor control by means of a wire feeder is desired,
place the Remote Control CONTACTOR switch in the
OFF position. Open-circuit voltage will be present at the
weld output terminals whenever the gun switch is
closed.
The OFF position is normally used with all wire feeding
processes (GMAW, GMAW-P, FCAW, SAW) and the
Gas Tungsten Arc Welding (GTAW) process. The ON
position is normally used with the Shielded Metal Arc
Welding (SMAW) and the Air Carbon Arc (CAC-A) Cut-
ting and gouging processes.
Lift end of toggle switch to change switch positions.
OM-533 Page 4
Voltmeter
Ammeter
Mode
Selector
Switch
Ammeter
Switch
Arc
Control
Arc Control
Pilot Light
Contactor
Switch
Figure 3-1. Front Panel View
Amps/Bkgd
Control And
Pilot Light
3-4. AMMETER SWITCH (Figure 3-1)
The AMMETER switch provides selection of reading
PEAK weld amperage or Average (AVG) weld amper-
age on the Remote Control digital ammeter.
Normally the AVG switch position is used for reading
weld amperage during Gas Metal Arc (GMAW), Flux
Cored Arc (FCAW), Submerged Arc (SAW), Shielded
Metal Arc (SMAW), Gas Tungsten Arc (GTAW) Welding
and Air Carbon Arc (CAC-A) Cutting and gouging pro-
cesses.
While welding using the Gas Metal Arc Welding - Pulsed
Arc (GMAW-P) process, the AVG switch position is used
when display of the average (background and peak)
weld amperage is desired. The AMMETER switch can
be placed in the PEAK position when display of peak
weld amperage is desired.
3-5. AMPS/BKGD CONTROL AND PILOT LIGHT
(Figure 3-1)
This control presets weld amperage for constant current
applications and background amperage for GMAW-P
applications.
When the Mode Selector switch is in the CC position or
one of the pulses per second positions, the AMPS/
BKGD pilot light turns on.
This control is disabled when the Mode Selector switch
is in the CV position.
Rotating the control clockwise increases amperage.
IMPORTANT: The AMPS/BKGD control can be ad-
justed while welding.
ST-109 521-A