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3-8.
WELDING
WIRE
INSTALLATION
(Figure 3-6)
C.
Adjustment
Of Hub
Tension
(Figure 3-1)
A.
Installation
Of
Spool-Type
Wire
1.
Remove
retaining ring.
2.
Slide
spool
of wire
onto hub
so
that wire feeds oft
bottom of
spool.
3.
Rotate
spool
until hole in
spool aligns
with
pin
in hub.
Slide
spool
onto hub until it seats
against
back
flange
of the hub.
4.
Reinstall
retaining ring
onto
hub.
B.
Installation Of
Optional
Wire Reel And Reel-
Type
Wire
1.
Remove
retaining ring
and,
if
applicable,
wire reel
assembly
from hub.
2.
Lay
wire reel
assembly
flat
on a
table
or
floor.
3.
Remove
spanner
nut
from wire reel
assembly.
4.
Remove wire
retainer,
and install wire
onto
wire reel.
Be
sure
that wire feeds off bottom of reel.
5.
Reinstall wire retainer and
spanner
nut onto
wire
reel.
6.
Slide wire reel
assembly
onto
hub,
and
rotate
as
sembly
until hub
guide pin
is seated in reel.
7.
Reinstall
retaining ring
onto
hub.
FIgure
3-6.
OptIonal
Wire Reel And
Reel-Type
Wire
Installation
Check the hub tension
by slowly rotating
the wire
spool
or
reel. The wire should unwind
freely,
but hub tension
should be sufficient
to
keep
wire taut and
prevent
back
lash when the wire feed
stops.
If
adjustment
is
required,
loosen
or
tighten
the hex
nut
on
the end of the hub sup
port
shaft
accordingly.
3-9.
BURNBACK CONTROL
Burnback is
provided by potentiometer
R32
on
Interface
Circuit Board PC3 inside
the unit. Burnback
can
be
set
between 0 and 0.25 seconds.
The burnback
circuitry
in this unit
keeps
the
welding
wire
from
sticking
to
the
workpiece
after the
arc
is extin
guished.
The burnback
circuitry keeps
weld
output
on
the
welding
wire from 0
to
0.25 seconds after the wire
has
stopped feeding.
This
delay
action
permits
the weld
ing
wire to burn back
to
a
point
where it neither sticks
to
the
workpiece
or
the
contact
tube.
a
WARNING: ELECTRIC SHOCK
can
kill.
Do
not
touch live electrical
parts.
Shut down
unit,
welding
power
source,
and
robot,
and disconnect
input
power
employing
locko
ut/tagging procedures
before
inspecting
or
installing.
Lockout/tagging procedures
consist of
padlock
ing
line disconnect switch in open
position,
re
moving
fuses from fuse
box,
or
shutting
off and
red-tag9ing
circuit breaker
or
other disconnect
ing
device.
CAUTION:
ELECTROSTATIC DISCHARGE
(ESD)
can
damage
circuit boards.
Put
on
properly grounded
wrist
strap
BEFORE
handling
circuit boards.
Perform work
only
at
a
static-safe work
area.
Retaining Ring
Retainer
Wire Reel
/
Spanner
Nut
a
Hub
Support
SC-1V
308
1.
Open
front
access
door and locate PC3.
2.
Locate
potentiometer
R32 in upper left
corner
of
PC3.
3.
Rotate R32 clockwise
to
increase burnback time.
4.
Close and
secure
front
access
door.
OM-135 582
Page
6
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