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2-7. REMOTE
START, STOP,
& EMERGENCY STOP
CONNECTIONS
(Figure
2-2)
If
remote
control
of the weld
cycle starting
is
desired,
con
nect
the leads from
a
normally
open
switch
to
pins
A and B
of
plug
PLG2.
If
remote
control of the weld
cycle stopping
is
desired,
con
nect
the leads from
a
normally
open switch
to
pins
A and C
of
plug
PLG2.
If
remote
control of the weld
cycle
emergency
stopping
is
desired,
connect
the
leads
from
a
normally
closed switch
between
pins
D and E of
plug
PLG2.
In
addition,
remove
the
lumper
lead between terminals 2 and 3 of terminal
strip
iT.
(See figure 3-1.)
Insert
plug
PLG2
into
the
weld control
receptacle
RC2.
Rotate the
plug
threaded
outer
ring
clockwise
onto
the recep
tacle threaded
body
as
far
as
possible.
This action will
secure
the
plug
in
the
receptacle.
SECTION
3- FUNCTION
OF CONTROLS
3-1. WELD START SWITCH
(Figure
2-2)
Rotating
the WELD START Switch
to
the ON
position
will
apply
115
volts
ac
to
the unit and
thereby place
it in
an
operational condition, ready
to
energize
the weld head and
permit shielding
gas
to
flow.
Rotating
the WELD START
Switch
to
the OFF
position
will shut the weld control down.
CAUTION__.!
Even
though
the WELD START Switin the OFF
position
and the unit is
apparently shutdown,
115
volts will still be present
at
the
input
terminals of the
WELD START Switch for
as
long
as
the 115 volts
cable is connected
to
its activated
source.
Depressing (closing(
the WELD START Switch
push
button
(or
Remote Start
Switch)
when the
WELD START Switch
is
in the
ON
position
will
commence
the preset weld
cycle.
If
the WELD START Switch
push
button
(or
Remote Start
Switch
I
is
depressed
when the WELD START Switch is in the
OFF
position,
the weld
cycle
will
not
commence.
The preset
weld
cycle will,
in any event,
commence
with
shielding
gas
pre-f
I
ow.
The WELD START Switch
(or
Remote Start
Switch(
may
remain closed
subsequent
to
weld
cycle initiation,
but
must
be
opened
and reclosed
to
initiate another weld
cycle.
3- 2. WELD CURRENT CONTROL
(Figure
2-2)
The WELD CURRENT Control
provides
a
means
of
deter
mining
the
rate
at
which
welding
wire will be fed into the
weld exclusive of the run-in wire feed
speed
as
governed by
the RUN
IN Control.
Rotating
the WELD CURRENT Con
trol
in
a
clockwise direction will increase the
rate
of wire
feed. When the WELD CURRENT Control is
set
at
0,
wire
will
feed
at
the slowest
speed;
when
set at
10,
the wire will
feed
at
the fastest
speed.
The scale which surrounds the WELD CURRENT Control is
calibrated in increments of
one
ranging
from 0
to
10. Due
to
this
calibration,
it should be noted that if this scale is
being
used
to
select
a
wire feed
speed setting, only
a
fraction of the
range
in
use
is
being
selected and
not
an
actual wire feed
speed
rate.
3- 3. STOP SWITCH
(Figure
2-2)
Depressing
(closing(
the
STOP
Switch
push
button
(or
Remote
Stop
Switch)
will
stop the weld head
motor
and
begin
the burnback and
post-flow
functions.
3- 4.
EMERGENCY
STOP SWITCH
(Figure
2-2)
Depressing
(opening(
the EMERGENCY STOP Switch
push
button
(or
Remote
Emergency
Stop
Switch)
will stop the
entire weld
cycle
except for burnback.
3- 5. INCH UP & INCH DOWN SWITCHES
(Figure
2-2)
Depressing
the
INCH
UP Switch
energizes
the weld head
motor to retract
the
welding
wire from the weld
at
the run-in
speed
established
by
the RUN IN Control.
Depressing
the INCH
DOWN Switch
energizes
the weld head
motor
to
advance the
welding
wire
to
the weld
at
the run-in
speed
established
by
the RUN IN Control.
In both the
inch-up
and inch-down
modes,
the
contactor
in
the
welding
power
source
and
the
gas
control
circuitry
remain
deenergized.
3- 6. PURGE SWITCH
(Figure
2-2)
The PURGE Button is
a
normally
open
momentary
contact
switch. This switch will
energize
the gas solenoid
GS1 and
purge the
shielding
gas line of the
gun.
The PURGE Button
also allows the
shielding
gas
regulator
to
be
adlusted
without
energizing
the
welding
circuit.
3- 7. POWER ON LIGHT
(Figure
2-2)
The POWER ON
pilot
light,
when
illuminated,
indicates that
the weld control is
energized.
3-8. CIRCUIT BREAKER
(Figure
2-2)
The circuit breaker
provides protection
to
the weld control
and weld head
motor.
In the
event
the weld control
or
weld
head
motor
should be
placed
in
an
overload
condition,
the
breaker
would
trip
and
suspend
all
output.
Should
this
breaker
trip,
the
reset
button
would have
to
be
manually
depressed
in order
to
reset
the circuit breaker.
3- 9. METERS
(Figure
2-2)
This weld control is
equipped
with
a
dc
ammeter
and
a
dc
voltmeter.
These
meters
are
connected
to
the
welding
power
source
output. The
voltmeter will indicate the dc
voltage
at
the
welding
power
source
secondary
terminals,
but will
not
necessarily
indicate the actual
voltage
at
the
welding
arc.
If
the
welding
cables
are
excessively long,
or
have poor, loose
connections,
the difference between actual
arc
voltage
and
the
voltage
at
the
welding
power
source
secondary
terminals
may be considerable.
3-10. BURNBACK CONTROL
(Figure
3-1)
The BURNBACK Control
regulates
the
amount
of
welding
wire that
protrudes beyond
the end of the
contact
tube
at
the
completion
of
a
weld
cycle.
In other
words,
the BURN-
BACK Control
adlusts
the
welding
wire burnback time from
0
to
.5 second.
By adjusting
this control
properly,
the weld
ing
wire will neither freeze in the weld
puddle
or
the
contact
tube.
Rotating
the
BURNBACK Control clockwise increases the
amount
of
welding
wire
burnback
towerd the
contact
tube.
The scale
surrounding
this control is
calibrated
arbitrarily.
Figure
3-1.
Inside Front Panel View
TB-003 748
OM-1510
Page
3
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