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3-11. RUN IN CONTROL
(Figure
3-11
The RUN IN Control
provides
a
means
of
determining
the
rate at
which
welding
wire will be fed into the weld
prior
to
arc
initiation.
After
arc
initiation,
the wire feed
speed
is
governed by
the
WELD CURRENT Control.
Rotating
the
RUN
IN Control in
a
clockwise direction
will
increase the
rate
of the wire feed. When the RUN IN 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 RUN IN Control is calibrated
in increments of
one
ranging
from 0
to
10. Due
to
this cali
bration,
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.
3-12. PRE FLOW CONTROL
(Figure3-1)
An
adjustable shielding
gas
PRE-FLOW Control
is
provided
for
controlling
the
period
of
time
shielding
gas
will
be
allowed
to
flow before the
welding
wire is fed and subse
quent
arc
initiation. The PRE
FLOW Control
governs the
operation
of
a
Pre-Flow Timer within
the weld control.
Rotating
the control in
a
clockwise direction will increase the
pre-flow
time. The scale
surrounding
the PRE FLOW Control
is
calibrated
arbitrarily.
As
soon
as
the
WELD START Switch
(or
Remote Start
Switch)
has been
closed,
the Pre-Flow Timer will
begin
to
time
out
the selected
period
of
pre-flow
time.
Once
the timer
has timed out, the gas valve will remain open, the
welding
wire will
begin
to
be
fed,
and the
contactor
will close pro
viding
weld
power.
The timer will then
automatically
reset
and be
ready
for another weld
cycle.
3-13. POST FLOW CONTROL
(Figure
3-1)
An
adjustable
0
to
1 second
shielding
gas POST FLOW Con
trol is
provided
for
controlling
the
period
of time
shielding
gas will be allowed
to
flow after the
arc
is
extinguished.
The
POST FLOW Control
governs the
operation
of
a
Post-Flow
Timer within the weld control.
Rotating
the control in
a
clockwise direction will increase the
post-flow
time.
The scale
surrounding
the POST FLOW Con
trol is calibrated
arbitrarily.
As
soon
as
the
arc
has been
extinguished,
the Post-Flow
Timer will
begin
to
time
out
the selected
period
of
post-flow
time.
Once the timer has timed out, the
gas valve will close
and
thereby
terminate
shielding
gas flow.
The timer will then
automatically
reset
and be
ready
for another weld
cycle.
3-14. WELD
TIME
CONTROL
(Figure
3-1)
A.
Spot
Weld Mode Of
Operation
An
adjustable
03
to
ZO second WELD TIME Control
is pro
vided for
controlling
the
period
of time weld power will be
available for spot
welding
in
this mode of
operation.
The
WELD TIME Control governs the
operation
of
a
Spot
Timer
within the
welding
power
source.
Rotating
the control in
a
clockwise direction will increase the
spot time. The scale
surrounding
the
WELD TIME Control
is
calibrated
arbitrarily.
The
Spot
Weld Timer will
begin
to
time
out
as soon as an arc
is initiated. When the time
set
on
the WELD TIME Control
has
elapsed,
weld
current
will
cease
and the
Post-Flow Timer
will be started.
B- Full Automatic Mode Of
Operation
The WELD TIME
Control,
in this mode of
operation,
adjusts
the crater-fill time from 0.3
to
2.0 seconds. The crater-fill
time is the time between the
applied signal
for weld
cycle
stopping
and the actual
welding
wire
stopping. Rotating
this
control
clockwise
will increase
the crater-fill
time. The scale
surrounding
the
WELD
TIME
Control
is
calibrated
arbi
trarily.
C. Semi-Automatic Mode Of
Operation
The WELD TIME
Control,
in this mode of
operation,
is in
operative.
3-15. OPERATIONAL
MODE
CONNECTIONS
(Figure
3-1)
A. Full Automatic
Operation
The Full
Automatic mode of
operation
should be used when
fixture
welding.
The weld
control,
when
shipped,
is
con
nected for
Full
Automatic
operation.
To
connect
for Full
Automatic
operation:
1.
Connect the
red/white
jumper
lead between terminals 1
and 6 of terminal
strip
iT.
2.
Connect the
yellow
lead
to
terminal 6 of terminal
strip
1 T.
B.
Spot
Weld
Operation
One of the
two
Spot
Weld modes of
operation
should be used
when
spot
welding
is desired. To
connect
for
one
of
these
Spot Welding Operations:
Mode 1:
To
start
arc
time from
arc
initiation,
connect
the
red/white jumper
lead between terminals
1 and
6
of terminal
strip
iT.
Connect the
yellow
lead
to
terminal 7 of terminal
strip
iT.
Mode 2:
To
start
arc
time from the end of the
shielding
gas
pre-flow
time,
connect
the
red/white
jumper
between terminal
I
and 7
of terminal
strip
iT.
Connect the
yellow
lead
to
terminal 7 of terminal
strip
iT.
C. Semi-Automatic
Operation
The Semi-Automatic mode of
operation
should be
used when
portable
gun
welding
is desired.
In
this
mode,
the WELD
TIME and POST FLOW Controls will be
inoperative.
To
con
nect
for Semi-Automatic
operation:
1.
Connect the
red/white
jumper
lead between
terminals
1
and 8 of terminal
strip
iT.
2.
Connect the
yellow
lead
to
terminal
7 of terminal
strip
iT.
3.
Remove the
green
jumper
lead from terminals 1 and 3 of
terminal
strip
iT.
4.
Connect
a
normally
open switch to
pins
D and E of
plug
PLG2. Insert
plug
PLG2
into
receptacle
RC2 and
rotate
the
plug
outer
threaded
ring
clockwise
onto
the
receptacle
threaded
body.
This action
will
secure
the
plug
in
the
receptacle.
Page
4
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