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sectIon 4
The fIne Voltage aDJustMent selector is an eight-
The fIne Voltage aDJustMent selector is an eight-
The fIne Voltage aDJustMent selector is an eight-
position switch for selecting the exact amount of arc volt-
position switch for selecting the exact amount of arc volt-
position switch for selecting the exact amount of arc volt-
age (or heat) to be applied to the weld arc. This allows for
age (or heat) to be applied to the weld arc. This allows for
age (or heat) to be applied to the weld arc. This allows for
fine tuning of the voltage required to stabilze the arc. The
fine tuning of the voltage required to stabilze the arc. The
fine tuning of the voltage required to stabilze the arc. The
Fine Voltage Selector switch also has an "open" detent at
Fine Voltage Selector switch also has an "open" detent at
Fine Voltage Selector switch also has an "open" detent at
the six o'clock position. Placing the switch in this position
the six o'clock position. Placing the switch in this position
the six o'clock position. Placing the switch in this position
allows operation of the torch trigger to feed electrode wire
allows operation of the torch trigger to feed electrode wire
allows operation of the torch trigger to feed electrode wire
without the wire being electrically "hot". This switch must
without the wire being electrically "hot". This switch must
without the wire being electrically "hot". This switch must
not be switched under load.
not be switched under load.
not be switched under load.
these tap switches carry several hundred amperes
these tap switches carry several hundred amperes
these tap switches carry several hundred amperes
while welding, and must not be switched under load,
while welding, and must not be switched under load,
while welding, and must not be switched under load,
as this will cause the contacts of the switches to arc.
as this will cause the contacts of the switches to arc.
as this will cause the contacts of the switches to arc.
4.1.3
4.1.3
4.1.3
seconDarY WelDIng connectIons
seconDarY WelDIng connectIons
seconDarY WelDIng connectIons
A solid state secondary contactor is used to energize the
A solid state secondary contactor is used to energize the
A solid state secondary contactor is used to energize the
welding curcuit. This contactor is activated with the torch
welding curcuit. This contactor is activated with the torch
welding curcuit. This contactor is activated with the torch
trigger and is energized when the trigger is pulled. The gas
trigger and is energized when the trigger is pulled. The gas
trigger and is energized when the trigger is pulled. The gas
solenoid is energized at the same time. When the trigger
solenoid is energized at the same time. When the trigger
solenoid is energized at the same time. When the trigger
switch is released, the contactor opens and disconnects the
switch is released, the contactor opens and disconnects the
switch is released, the contactor opens and disconnects the
load. The gas valve shuts off when the contactor opens.
load. The gas valve shuts off when the contactor opens.
load. The gas valve shuts off when the contactor opens.
The secondary output welding terminals, POS.(+) and NEG(-
The secondary output welding terminals, POS.(+) and NEG(-
The secondary output welding terminals, POS.(+) and NEG(-
), are located on the front panel and are used to set the
), are located on the front panel and are used to set the
), are located on the front panel and are used to set the
welding polarity (D.C.R.P. or D.C.S.P.) (see Fig. 4.1). TORCH
welding polarity (D.C.R.P. or D.C.S.P.) (see Fig. 4.1). TORCH
welding polarity (D.C.R.P. or D.C.S.P.) (see Fig. 4.1). TORCH
fitting is connected to Positive, and WORK cable/clamp
fitting is connected to Positive, and WORK cable/clamp
fitting is connected to Positive, and WORK cable/clamp
is connected to Negative output). To weld using D.C.S.P.,
is connected to Negative output). To weld using D.C.S.P.,
is connected to Negative output). To weld using D.C.S.P.,
simply mount the WORK cable to the Positive output and
simply mount the WORK cable to the Positive output and
simply mount the WORK cable to the Positive output and
the TORCH fitting cable to the Negative output terminal.
the TORCH fitting cable to the Negative output terminal.
the TORCH fitting cable to the Negative output terminal.
Because of the charged capacitor bank in the second-
Because of the charged capacitor bank in the second-
Because of the charged capacitor bank in the second-
ary circuit, the output voltage will take a few seconds
ary circuit, the output voltage will take a few seconds
ary circuit, the output voltage will take a few seconds
before falling to zero volts.
before falling to zero volts.
before falling to zero volts.
4.1.4 WIre feeD speeD control
4.1.4 WIre feeD speeD control
4.1.4 WIre feeD speeD control
Wire feed speed is controlled by the wire speed potentiom-
Wire feed speed is controlled by the wire speed potentiom-
Wire feed speed is controlled by the wire speed potentiom-
eter knob on the front panel. The solid state control allows
eter knob on the front panel. The solid state control allows
eter knob on the front panel. The solid state control allows
for infinitely variable speeds up to 750 IPM.
for infinitely variable speeds up to 750 IPM.
for infinitely variable speeds up to 750 IPM.
This wire speed pot is used to set the speed at which the
This wire speed pot is used to set the speed at which the
This wire speed pot is used to set the speed at which the
welding wire is fed out from the torch and hence the welding
welding wire is fed out from the torch and hence the welding
welding wire is fed out from the torch and hence the welding
amperage. The panel-face numbers on the dial (0-10) are
amperage. The panel-face numbers on the dial (0-10) are
amperage. The panel-face numbers on the dial (0-10) are
used for reference and do not directly indicate wire feed
used for reference and do not directly indicate wire feed
used for reference and do not directly indicate wire feed
speed; the higher the number, the faster the speed. Table
speed; the higher the number, the faster the speed. Table
speed; the higher the number, the faster the speed. Table
4.1 show the relationship of wire speed vs. potentiometer
4.1 show the relationship of wire speed vs. potentiometer
4.1 show the relationship of wire speed vs. potentiometer
setting.
setting.
setting.
Dial setting
Dial setting
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
table 4.1 relationship of
wire speed vs. potentiometer setting
4.1.5 stanDarD/spool gun selector
4.1.5 stanDarD/spool gun selector
This two-position toggle switch is used to select standard
This two-position toggle switch is used to select standard
metal inert gas welding (MIG) with the GUNMASTER 250, or
metal inert gas welding (MIG) with the GUNMASTER 250, or
welding with the MT-250SG/ST-23A spool guns.
welding with the MT-250SG/ST-23A spool guns.
Standard / Spool Gun Select Switch
figure 4.2 standard/spool gun selector
30
operatIon
Wire speed IpM
Wire speed IpM
0
0
30
30
115
115
200
200
300
300
380
380
455
455
525
525
615
615
703
703
760
760
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