Miller AUTO ARC 255 Owner's manual

AUTO ARC 255
Miller
Brand
Miller
Model
AUTO ARC 255
Category
Welding System
Type
Owner's manual

This manual is also suitable for

Miller AUTO ARC 255 is a versatile welding machine designed for Gas Metal Arc (MIG) Welding and Flux Cored Arc (FCAW) Welding processes. It offers precise control over welding parameters, enabling users to achieve high-quality welds on various materials, including mild steel, stainless steel, and aluminum. With its user-friendly interface, it is suitable for both professional welders and hobbyists. The AUTO ARC 255 is ideal for fabrication, repair, and maintenance work in automotive, construction, and DIY projects.

Miller AUTO ARC 255 is a versatile welding machine designed for Gas Metal Arc (MIG) Welding and Flux Cored Arc (FCAW) Welding processes. It offers precise control over welding parameters, enabling users to achieve high-quality welds on various materials, including mild steel, stainless steel, and aluminum. With its user-friendly interface, it is suitable for both professional welders and hobbyists. The AUTO ARC 255 is ideal for fabrication, repair, and maintenance work in automotive, construction, and DIY projects.

AUTO
ARCjF
OM-151
OGGN
August
1998
Processes
Gas
Metal
Arc
(MIG)
Welding
Flux
Cored
Arc
(FCAW)
Welding
Descrlptloo
Arc
Welding
Power
Source
And
Wire
Feeder
Auto
Arcfi
255
For
Technical
Support,
Contact:
Milweld
Inc.,
National
Distributor
P.O.
Box
338,
Hortonville,
WI
54944-0338
Tel
920-779-0924
Fax
920-779-0924
OWNERS
MANUAL
TABLE
OF
CONTENTS
SECTION
1
-
SAFETY
PRECAUTIONS
-
READ
BEFORE
USING
1
1-1.
Symbol
Usage
1
1-2.
Arc
Welding
Hazards
1
1-3.
Additional
Symbols
for
Installation,
Operation,
and
Maintenance
3
1-4.
Principal
Safety
Standards
3
1-5.
EMFlnformation
4
SECTION
2
-
INSTALLATION
5
2-1.
Specifications
5
2-2.
Volt-Ampere
Curve
5
2-3.
Duty
Cycle
And
Overheating
6
2-4.
Installing
Work
Clamp
7
2-5.
Installing
Gas
Supply
7
2-6.
Installing
Welding
Gun
8
2-7.
Installing
Wire
Spool
And
Adjusting
Hub
Tension
8
2-8.
Setting
Gun
Polarity
9
2-9.
Positioning
Jumper
Links
10
2-10.
Electrical
Service
Guide
10
2-11.
Selecting
A
Location
And
Connecting
Input
Power
11
2-12.
Threading
Welding
Wire
12
SECTION
3-OPERATION
13
3-1.
Front
Panel
Controls
13
3-2.
Center
Battle
Controls
13
SECTION
4-
MAINTENANCE
&
TROUBLESHOOTING
14
4-1.
Routine
Maintenance
14
4-2.
Circuit
Breaker
CB1
14
4-3.
Fuses
Fl
And
F2
15
4-4.
Changing
Drive
Roll
And
Wire
In
let
Guide
16
4-5.
Aligning
Drive
Rolls
And
Wire
Guide
16
4-6.
Troubleshooting
17
SECTION
5-
ELECTRICAL
DIAGRAM
18
SECTION
6
-
PARTS
LIST
t9
WARRANTY
OM-157
066-N
SECTION
1
-
SAFETY
PRECAUTIONS
-
.READ
BEFORE
USING
1-1.
Symbol
Usage
som
_nd_5/97
4A
Means
Warning!
Watch
Out!
There
are
possible
hazards
with
this
procedure!
The
possible
hazards
are
shown
in
the
adjoining
symbols.
A
Marks
a
specia
safety
message.
1-2
Arc
Welding
Hazards
A
The
symbols
shown
below
are
used
throughout
this
manual
to
call
attention
to
and
identify
possible
hazards.
When
you
see
the
symbol,
watch
out,
and
followthe
related
instructions
to
avoid
the
hazard.
The
safety
information
given
below
is
only
a
summary
of
the
more
complete
safety
information
found
in
the
Safety
Standards
listed
in
Section
1-4.
Read
and
follow
all
Safety
Standards.
A
Only
qualified
persons
should
install,
operate,
maintain,
and
repair
this
unit.
A
During
operation,
keep
everybody,
especially
children,
away.
ELECTRIC
SHOCK
cankill.
Touching
live
electrical
parts
can
cause
fatal
shocks
or
severe
burns.
The
electrode
and
work
circuit
is
electrically
live
whenever
the
output
is
on.
The
input
power
circuit
and
machine
internal
circuits
are
also
live
when
power
is
on.
In
semiautomatic
or
automatic
wire
welding,
the
wire,
wire
reel,
drive
roll
housing,
and
all
metal
parts
touching
the
welding
wire
are
electrically
live.
Incorrectly
installed
or
improperly
grounded
equipment
is
a
hazard.
Do
not
touch
live
electrical
parts.
Wear
dry,
hole-tree
insulating
gloves
and
body
protection.
Insulate
yourself
from
work
and
ground
using
dry
insulating
mats
or
covers
big
enough
to
prevent
any
physical
contact
with
the
work
or
ground.
Do
not
use
AC
output
in
damp
areas,
if
movement
is
confined,
or
if
there
is
a
danger
of
falling.
Use
AC
output
ONLY
if
required
for
the
welding
process.
If
AC
output
is
required,
use
remote
output
control
if
present
on
unit.
Disconnect
input
power
or
stop
engine
before
installing
or
servicing
this
equipment.
Lockout/tagout
input
power
according
to
OSHA
29
CFR
191
0.147
(see
Safety
Standards).
Properly
install
and
ground
this
equipment
according
to
its
Owners
Manual
and
national,
state,
and
local
codes.
Always
verify
the
supply
ground
-
check
and
be
sure
that
input
power
cord
ground
wire
is
properly
connected
to
ground
terminal
in
disconnect
box
or
that
cord
plug
is
connected
to
a
properly
grounded
receptacle
outlet.
When
making
input
connections,
attach
proper
grounding
conductor
first
-
double-check
connections.
Frequently
inspect
input
power
cord
for
damage
or
bare
wiring
-
replace
cord
immediately
if
damaged
-
bare
wiring
can
kill.
Turn
off
all
equipment
when
not
in
use.
Do
not
use
worn,
damaged,
undersized,
or
poorly
spliced
cables.
Do
not
drape
cables
over
your
body.
This
group
of
symbols
means
Warning!
Watch
Out!
possible
ELECTRIC
SHOCK,
MOVING
PARTS,
and
HOT
PARTS
hazards.
Consult
symbols
and
related
instructions
below
for
necessary
actions
to
avoid
the
hazards.
If
earth
grounding
of
the
workpiece
is
required,
ground
it
directly
with
a
separate
cable
-
do
not
use
work
clamp
or
work
cable.
Do
not
touch
electrode
if
you
are
in
contact
with
the
work,
ground,
or
another
electrode
from
a
different
machine.
Use
only
well-maintained
equipment.
Repair
or
replace
damaged
parts
at
once.
Maintain
unit
according
to
manual.
Wear
a
safety
harness
if
working
above
floor
level.
Keep
all
panels
and
covers
securely
in
place.
Clamp
work
cable
with
good
metal-to-metal
contact
to
workpiece
or
worktable
as
near
the
weld
as
practical.
Insulate
work
clamp
when
not
connected
to
workpiece
to
prevent
contact
with
any
metal
object.
Do
not
connect
more
than
one
electrode
or
work
cable
to
any
single
weld
output
terminal.
SIGNIFICANT
DC
VOLTAGE
exists
after
removal
of
input
power
on
inverters.
Turn
Off
inverter,
disconnect
input
power,
and
discharge
input
capacitors
according
to
instructions
in
Maintenance
Section
before
touching
any
parts.
FUMES
AND
GASES
can
be
hazardous.
Welding
produces
fumes
and
gases.
Breathing
these
fumes
and
gases
can
be
hazardous
to
your
health.
Keep
your
head
out
of
the
fumes.
Do
not
breathe
the
fumes.
If
inside,
ventilate
the
area
andfor
use
exhaust
at
the
arc
to
remove
welding
fumes
and
gases.
If
ventilation
is
poor,
use
an
approved
air-supplied
respirator.
Read
the
Material
Safety
Data
Sheets
(MSDSs)
and
the
manufacturers
instructions
for
metals,
consumables,
coatings,
cleaners,
and
degreasers.
Work
in
a
confined
space
only
if
it
is
well
ventilated,
or
while
wearing
an
air-supplied
respirator.
Always
have
a
trained
watch-
person
nearby.
Welding
fumes
and
gases
can
displace
air
and
lower
the
oxygen
level
causing
injury
or
death.
Be
sure
the
breathing
air
is
safe.
Do
not
weld
in
locations
near
degreasing,
cleaning,
or
spraying
operations.
The
heat
and
rays
of
the
arc
can
react
with
vapors
to
form
highly
toxic
and
irritating
gases.
Do
not
weld
on
coated
metals,
such
as
galvanized,
lead,
or
cadmium
plated
steel,
unless
the
coating
is
removed
from
the
weld
area,
the
area
is
well
ventilated,
and
if
necessary,
while
wearing
an
air-supplied
respirator.
The
coatings
and
any
metals
containing
these
elements
can
give
off
toxic
fumes
if
welded.
Means
Note~
not
safety
related.
OM-157
066
Page
1
Arc
rays
from
the
welding
process
produce
intense
visible
and
invisible
(ultraviolet
and
infrared)
rays
that
can
burn
eyes
and
skin.
Sparks
fly
off
from
the
weld.
Wear
awelding
helmet
fitted
with
a
propershade
offilterto
protect
your
face
and
eyes
when
welding
or
watching
(see
ANSI
Z49.i
and
Z87.1
listed
in
Safety
Standards).
Wear
approved
safety
glasses
with
side
shields
under
your
helmet.
Use
protective
screens
or
barriers
to
protect
others
from
flash
and
glare;
warn
others
not
to
watch
the
arc.
Wear
protective
clothing
made
from
durable,
flame-resistant
material
(leather
and
wool)
and
foot
protection.
WELDING
an
cause
fire
orexplosin.
Welding
on
closed
containers,
such
as
tanks,
drums,
or
pipes,
can
cause
them
to
blow
up.
Sparks
can
fly
off
from
the
welding
arc.
The
flying
sparks,
hot
workpiece,
and
hot
equipment
can
cause
fires
and
burns.
Accidental
contact
of
electrode
to
metal
objects
can
cause
sparks,
explosion,
overheating,
or
fire.
Check
and
be
sure
the
area
is
safe
before
doing
any
welding.
Protect
yourself
and
others
from
flying
sparks
and
hot
metal.
Do
not
weld
where
flying
sparks
can
strike
flammable
material.
Remove
all
flammables
within
35
ft
(10.7
m)
of
the
welding
arc.
If
this
is
not
possible,
tightly
cover
them
with
approved
covers.
Be
alert
that
welding
sparks
and
hot
materials
from
welding
can
easily
go
through
small
cracks
and
openings
to
adjacent
areas.
Watch
for
fire,
and
keep
a
fire
extinguisher
nearby.
Be
aware
that
welding
on
a
ceiling,
floor,
bulkhead,
or
partition
can
cause
fire
on
the
hidden
side.
Do
not
weld
on
closed
containers
such
as
tanks,
drums,
or
pipes,
unless
they
are
properly
prepared
according
to
AWS
F4.1
(see
Safety
Standards).
Connect
work
cable
to
the
work
as
close
to
the
welding
area
as
practical
to
prevent
welding
current
from
traveling
long,
possibly
unknown
paths
and
causing
electric
shock
and
fire
hazards.
Do
not
use
welder
to
thaw
frozen
pipes.
Remove
stick
electrode
from
holder
or
cut
off
welding
wire
at
contact
tip
when
not
in
use.
Wear
oil-free
protective
garments
such
as
leather
gloves,
heavy
shirt,
cuffless
trousers,
high
shoes,
and
a
cap.
Remove
any
combustibles,
such
as
a
butane
lighter
or
matches,
from
your
person
before
doing
any
welding.
FLYING
METAL
can
injure
eyes
Welding,
chipping,
wire
brushing,
and
grinding
cause
sparks
and
flying
metal.
As
welds
cool,
they
can
throw
off
slag.
Wear
approved
safety
glasses
with
side
shields
even
under
your
welding
helmet.
BUILDUP
OF
GAS
can
injure
or
kill
Shut
off
shielding
gas
supply
when
not
in
use.
Always
ventilate
confined
spaces
or
use
approved
air-supplied
respirator.
HOT
PARTS
can
cause
severe
burns..
Do
not
touch
hot
parts
bare
handed.
Allow
cooling
period
before
working
on
gun
or
torch.
MAGNETIC
FIELDS
can
affect
pacemÆkers~.
Pacemaker
wearers
keep
away.
Wearers
should
consult
their
doctor
before
going
near
arc
welding,
gouging,
or
spot
welding
operations.
NOISE
can
damage
hearing
Noise
from
some
processes
or
equipment
can
damage
hearing.
Wear
approved
ear
protection
if
noise
level
is
high.
CYLINDERS
can
explode
If
damaged
Shielding
gas
cylinders
contain
gas
under
high
pressure.
If
damaged,
a
cylinder
can
explode.
Since
gas
cylinders
are
normally
part
of
the
welding
process,
be
sure
to
treat
them
carefully.
Protect
compressed
gas
cylinders
from
excessive
heat,
mechanical
shocks,
slag,
open
flames,
sparks,
and
arcs.
Install
cylinders
in
an
upright
position
by
securing
to
a
stationary
support
or
cylinder
rack
to
prevent
falling
or
tipping.
Keep
cylinders
away
from
any
welding
or
other
electrical
circuits.
Never
drape
a
welding
torch
over
a
gas
cylinder.
Never
allow
a
welding
electrode
to
touch
any
cylinder.
Never
weld
on
a
pressurized
cylinder
-
explosion
will
result.
Use
only
correct
shielding
gas
cylinders,
regulators,
hoses,
and
fittings
designed
for
the
specific
application;
maintain
them
and
associated
parts
in
good
condition.
Turn
face
away
from
valve
outlet
when
opening
cylinder
valve.
Keep
protective
cap
in
place
over
valve
except
when
cylinder
is
in
use
or
connected
for
use.
Read
and
follow
instructions
on
compressed
gas
cylinders,
associated
equipment,
and
CGA
publication
P-i
listed
in
Safety
Standards.
ARC
RAYS
can
burn
eyes
and
skin
OM-157
066
Page
2
1-5
EMF
Information
Considerations
About
Welding
And
The
Effects
Of
Low
Frequency
1.
Keep
cables
close
together
by
twisting
or
taping
them.
Electric
And
Magnetic
Fields
Welding
current,
as
it
flows
through
welding
cables,
will
cause
electro-
2.
Arrange
cables
to
one
side
and
away
from
the
operator.
magnetic
fields.
There
has
been
and
still
is
some
concern
about
such
fields.
However,
after
examining
more
than
500
studies
spanning
17
3.
Do
not
coil
or
drape
cables
around
your
body.
years
of
research,
a
special
blue
ribbon
committee
of
the
National
Research
Council
concluded
that:
The
body
of
evidence,
in
the
4.
Keep
welding
power
source
and
cables
as
far
away
from
opera-
committees
judgment,
has
not
demonstrated
that
exposure
to
power-
tor
as
practical.
frequency
electric
and
magnetic
fields
is
a
human-health
hazard.
However,
studies
are
still
going
forth
and
evidence
continues
to
be
5.
Connect
work
clamp
to
workpiece
as
close
to
the
weld
as
examined.
Until
the
final
conclusions
of
the
research
are
reached,
you
possible.
may
wish
to
minimize
your
exposure
to
electromagnetic
fields
when
welding
or
cutting.
About
Pacemakers:
To
reduce
magnetic
fields
in
the
workplace,
use
the
following
Pacemakerwearersconsultyourdoctorfirst.
If
cleared
byyourdoctor,
procedures:
then
following
the
above
procedures
is
recommended.
OM-157
066
Page
4
2-1.
Specifications
SECTION
2-
INSTALLATION
Rated
Weldin
g
Output
Amperage
Range
DC
Maximum
Open-Circuit
Voltage
DC
Amperes
Input
at
Rated
Load
Output,
50
or
60
Hz,
Single-Phase
200
V
230
V
KVA
KW
200
A
@
28
Volt
s
DC,
60%
Duty
Cycle
250
A
@
28
Volts
DC,
40%
40-250
42
46
1.1*
40
1.3*
9.5
0.31*
8.3
0.18*
Duty
Cycle
Wire
Ty
pe
And
Diameter
Wire
Feed
Speed
Range
Overall
Dimensions
Weight
Solid
Steel
/
Flux
Cored
,i
Stainless
Steel
Aluminum
Length:
37
in
(940
mm)
.023
-
.045
in
(0.6
-
1.2
mm)
.030
-
.035
in
(0.8
-
0.9
mm)
And
3/64
in
(1.2
mm)
Alu
90
-
1030
1PM
(2.9
-
26.2
rn/mm)
Width:
19
in
(483
mm)
225
lb
(102
kg)
Height:
32
in
(889
mm)
~WhiIe
idling
2-2.
Volt-Ampere
Curve
The
volt-ampere
curves
show
the
minimum
and
maximum
voltage
6C
and
amperage
output
capabilities
of
the
welding
power
source.
Curves
of
other
settings
fall
be
4C
U)
I.
-J
0
>
3C
.
c
U
2C
IC
tween
the
curves
shown.
~
~
~__
~
~
~
:=:
pj~
~
-~
E~
~
~
-~
~
-
-~
~
L~
~--
0
U
25
50
75
100
125 I~O
175
200
225
D.C.
AWERES
ssbl.1
10/91
-
S8-049
424-C
OM-157
066
Page
5
2-3.
Duty
Cycle
And
Overheating
Cl)
Ui
LU
a
0
-J
Lii
300
250
DUTY
CYCLE
4
Minutes
Resting
~AorV
Reduce
Duty
Cycle
dutyl
4/95
-
SB-150
215
RATED
OIJrPUT-1
Duty
Cycle
is
percentage
of
10
minutes
that
unit
can
weld
at
rated
load
without
overheating.
200
If
unit
overheats,
thermostat(s)
opens,
output
stops,
and
cooling
fan
runs.
Wait
fifteen
minutes
for
unit
to
cool.
Reduce
amperage
or
voltage,
or
duty
cycle
before
welding.
160
~,s
A
Exceeding
duty
cycle
can
damage
unit
and
void
warranty.
I
i
s
I
~l
100
20
30
40
50 80
70
8090100
60%
Duty
Cycle
At
200
Amperes
6
Minutes
Welding
Overheating
~
I-
Minutes
OM-157
066
Page
6
2-4.
Installing
Work
Clamp
5
2
1
Work
Cable
2
Boot
Slide
boot
onto
work
cable.
Route
cable
out
front
panel
opening
from
4
inside.
3
Negative
(-)
Output
Terminal
Connect
cable
to
terminal
and
cover
connection
with
boot.
4
Hardware
5
Work
Clamp
Route
cable
through
clamp
handle
and
secure as
shown.
Close
door.
Tools
Needed:
~=Z
1/2,3/4
in
ST-Boo
918-B
3
2-5.
Installing
Gas
Supply
Chain
gas
cylinder
to
running
gear,
wall,
or
other
stationary
support
so
cylinder
cannot
fall
and
break
off
valve.
1
Regulator/Flow
Gauge
Install
so
face
is
vertical.
2
Gas
Hose
Connection
Fitting
has
5/8-18
right-hand
threads.
Argon
Gas
OR
3
Flow
Adjust
Typical
flow
rate
is
20
cfh
(cubic
feet
per
hour).
Check
wire
man
ufacturers
recommended
flow
rate.
This
flow
gauge
can
be
adjusted
between
5
and 25
cfh.
4
CO2
Adapter
Customer
Supplied
5
0-Ring
Install
adapter
with
0-ring
between
regulator/flow
gauge
and
CO2
cylinder.
Tools
Needed:
5/8,
1-1/8
in
ST-i
54
623-A
/
Ref.
ST-i
09
492
OM-157
066
Page
7
2-6.
Installing
Welding
Gun
1
Drive
Assembly
2
Gun
Securing
Knob
3
Gun
End
Loosen
securing
knob.
Insert
gun
end
through
opening
until
it
bot
toms
against
drive
assembly.
Tighten
nut.
4
Gun
Trigger
Plug
Insert
plug
into
receptacle,
and
tighten
threaded
collar.
Close
door.
Ref.
ST-801
677
2-7.
Installing
Wire
Spool
And
Adjusting
Hub
Tension
OM-157
066
Page
8
2-8.
Setting
Gun
Polarity
~
1
Label
~iiiL.
Assembly)
Always
read
and
follow
manufac
tures
recommended
polarity.
Shown
As
Shipped
-
Set
For Electrode
Positive
(DCEP)
For
Solid
Steel
Or
Aluminum
Wires
(GMAW
Process).
1
Wire
Drive
Assembly
Lead
To
Positive
(+)
Output
Terminal
Work
Clamp
Lead
To
Negative
(-)
Output
Terminal
GUN
POLARITY
CHANGEOVER
CONNECTIONS
Reverse
Lead
Connections
-
For
Electrode
Negative
(DCEN)
For
Flux
Cored
Wires
(FCAW
Process).
Drive
Assembly
Becomes
Negative
S144
449.0
Tools
Needed:
~ZZ
3/4,11/l6in
OM-157
066
Page
9
2-12.
Threading
Welding
Wire
1
Wire
Spool
2
Welding
Wire
3
InletWire
Guide
4
Pressure
Adjustment
Knob
5
Drive
Roll
6
Outlet
Wire
Guide
7
Gun
Conduit
Cable
Lay
gun
cable
out
straight.
Remove
gun
nozzle
and
contact
tip.
l~
POWER
O~F~
Press
gun
trigger
until
wire
comes
out
of
gun.
Reinstall
contact
tip
and
nozzle.
1111
II
Feed
wire
to
check
drive
roll
pressure.
Tighten
knob
enough
to
prevent
slipping.
Cut
off
wire.
Close
and
latch
door.
Tools
Needed:
Open
pressure
assembly.
Pull
and
hold
wire;
cut
off
end.
Push
wire
thru
guides
into
gun;
continue
to
hold
wire.
Close
and
tighten
pressure
assembly,
and
let
go
of
wire.
Ref.
ST-8O1
677
/
S-0627-A
OM-157
066
Page
12
SECTION
4-
MAINTENANCE
&
TROUBLESHOOTING
4-1.
Routine
Maintenance
4-2.
Circuit
Breaker
CB1
OM-157
066
Page
14
4-3.
Fuses
Fl
And
F2
OM-157
066
Page
15
4-4.
Changing
Drive
Roll
And
Wire
Inlet
Guide
1
Securing
Screw
2
Inlet
Wire
Guide
Loosen
screw.
Slide
tip
as
close
to
drive
rolls
as
possible
without
touching.
Tighten
screw.
3
Anti-Wear
Guide
Install
guide
as
shown.
4
Drive
Roll
Install
correct
drive
roll
for
wire size
and
type.
5
Drive
Roll
Securing
Nut
Turn
nut
one
click
to
secure
drive
roll.
Tools
Needed:
~
5/64
in
i~
7/l6in
4-5.
Aligning
Drive
Rolls
And
Wire
Guide
ST-150
227-C
A
Turn
Off
unit.
View
is
from
top
of
drive
rolls
look
ing
down
with
pressure
assembly
open.
Correct
Incorrect
1
Drive
Roll
Securing
Nut
2
Drive
Roll
3
Wire
Guide
4
Welding
Wire
5
Drive
Gear
Insert
screwdriver,
and
turn
screw
in
or
out
until
drive
roll
groove
lines
up
with
wire
guide.
Close
pressure
assembly.
5
Tools
Needed:
+
Ref.
ST-Boo
412-A
OM-157
066
Page
16
4-6.
Troubleshooting
Welding
Trouble
Remedy
No
weld
output;
wire
does
not
feed.
Secure
power
cord
plug
in
receptacle
(see
Section
2-11).
Reset
circuit
breaker
CB1
(see
Section
4-2).
Replace
fuse
Fl
and/or
F2
(see
Section
4-3).
Replace
building
line
fuse
or
reset
circuit
breaker
if
open
(see
Section
2-11).
Secure
gun
trigger
plug
in
receptacle
or
repair
leads,
or
replace
trigger
switch
(see
Section
2-6).
Thermostat
TP1
open
(overheating).
Allowfan
to
run;
the
thermostat
will
close
when
the
unit
has
cooled
(see
Section
2-3).
No
weld
output;
wire
feeds.
Connect
work
clamp
to
get
good
metal
to
metal
contact.
Replace
contact
tip
(see
Gun
Owners
Manual).
Low
weld
output.
Connect
unit
to
proper
input
voltage
or
check
for
low
line
voltage
(see
Section
2-11).
Wire
Drive/Gun
Trouble
Remedy
Electrode
wire
feeding
stops
during
welding.
..
Straighten
gun
cable
and/or
replace
damaged
parts
(see
Gun
Owners
Manual).
Adjust
drive
roll
pressure
(see
Section
2-12).
Readjust
hub
tension
(see
Section
2-7).
Replace
contact
tip
if
blocked
(see
Gun
Owners
Manual).
Clean
or
replace
wire
inlet
guide
or
liner
if
dirty
or
plugged
(see
Gun
Owners
Manual).
Replace
drive
rolls
if
worn
or
slipping
(see
Section
4-4).
Secure
gun
trigger
plug
in
receptacle
or
repair
leads,
or
replace
trigger
switch
(see
Section
2-6).
Check
and
replace
Fl
and/or
F2
(see
Section
4-3).
Check
and
clear
any
restrictions
at
drive
assembly
and
liner
(see
Gun
Owners
Manual).
Have
nearest
Factory
Authorized
Service
Agent
check
drive
motor.
OM-157
066
Page
17
SECTION
5-
ELECTRICAL
DIAGRAM
Figure
5-1.
Circuit
Diagram
For
Welding
Power
Source
PLG2
SB-i
73
544-E
OM-157
066
Page
18
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Miller AUTO ARC 255 Owner's manual

AUTO ARC 255
Miller
Brand
Miller
Model
AUTO ARC 255
Category
Welding System
Type
Owner's manual
This manual is also suitable for

Miller AUTO ARC 255 is a versatile welding machine designed for Gas Metal Arc (MIG) Welding and Flux Cored Arc (FCAW) Welding processes. It offers precise control over welding parameters, enabling users to achieve high-quality welds on various materials, including mild steel, stainless steel, and aluminum. With its user-friendly interface, it is suitable for both professional welders and hobbyists. The AUTO ARC 255 is ideal for fabrication, repair, and maintenance work in automotive, construction, and DIY projects.

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