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SECTION
4
-
FUNCTION OF CONTROLS
Inch
Circuit
Purge
Button
TC-070 484
4
-
1.
POWER SWITCH
(Figure
4-1)
-
Placing
the
POWER switch
on
the weld control in the
ON
position
will
apply
115 volts
ac
to
the unit and
thereby place
it in
an
operational condition,
permitting
the preprogramm
ed
welding
cycle
to start
when the START button is
depressed,
or
gas
to
flow when the
PURGE button is
depressed,
or
welding
wire
to
feed if the INCH switch is
depressed.
The
meters
will
illuminate
showing
the
selected WELD VOLTAGE
and WELD WIRE SPEED.
Placing
the POWER switch in the OFF
position
wilI shut
the weld control and associated
components
down.
This switch
must
be in the ON
position
to
preprogram
the desired weld
cycle.
4
-2. RETRACT-ADVANCE SWITCH AND INCH
SWITCH
(Figure
4-1)
-
With
the
RETRACT-
ADVANCE
switch
in
the
RETRACT
position,
the
welding
wire will
retract
into the gun
at
the
speed
set
by
the CRATER & INCH WIRE SPEED
control
only
while
the INCH switch is activated.
With
the
RETRACT-ADVANCE
switch
in
the AD
VANCE
position,
the
welding
wire will advance from the
gun
at
the
speed
set
by
the CRATER & INCH WIRE
SPEED
control
only
while the INCH switch is activated.
The
INCH
switch
is
a
normally-open,
momentary-
contact,
toggle
switch.
Activating
the
switch
will
energize
the drive
motor
without
energizing
the
welding
power
source
contactor
or
the gas
control
circuitry.
4
-
3. PURGE
PUSH-BUTTON
SWITCH
(Figure
4-1)
-
The
PURGE
push-button
switch is
a
normally-
open,
momentary-contact
switch.
Depressing
the
push
button will
energize
the gas solenoid and
thereby
purge
the
shielding
gas line
to
the gun.
4
-
4.
START
PUSH-BUTTON
SWITCH
(Figures
4-1
&
3-3)
-
Depressing
the
START
push-button
switch will
start
the
preprogrammed
weld
cycle.
See
Figure
3-3 for weld
cycle
events.
The weld
cycle
will
continue until the
STOP
push-button
switch is
depress
ed
or
the SPOT TIME control times
out.
Figure
4-1. Front Panel Controls
Page
10
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