Lincoln Electric Pro-mig 175 User Manual

Pro-MIG 175

OPERATOR’S MANUAL

IM810

July, 2005

Safety Depends on You

Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However, your
overall safety can be increased by
proper installation ... and thought­ful operation on your part. DO

NOT INSTALL, OPERATE OR
REPAIR THIS EQUIPMENT
WITHOUT READING THIS
MANUAL AND THE SAFETY
PRECAUTIONS CONTAINED
THROUGHOUT. And, most

importantly, think before you act
and be careful.

For use with machine Code Numbers 11009

• Sales and Service through Subsidiaries and Distributors Worldwide •

Cleveland, Ohio 44117-1199 U.S.A. TEL: [phone] FAX: [phone] WEB SITE: www.lincolnelectric.com

• World's Leader in Welding and Cutting Products •

Copyright © 2005 Lincoln Global Inc.

ISO 9001

CERTIFICATE NUMBER: 30273

Designed and Manufactured Under a

Quality Program Certified by
ABS Quality Evaluations, Inc.

to ISO 9001 Requirements.

QMS

ANSI RAB

FOR ENGINE
powered equipment.

1.a. Turn the engine off before troubleshooting and maintenance
work unless the maintenance work requires it to be running.

____________________________________________________

1.b. Operate engines in open, well-ventilatedareas or vent the

engine exhaust fumes outdoors.

____________________________________________________

1.c. Do not add the fuel near an open flame welding arc or when

the engine is running. Stop the engine and allow
it to cool before refueling to prevent spilled fuel
from vaporizing on contact with hot engine parts
and igniting. Do not spill fuel when filling tank. If
fuel is spilled, wipe it up and do not start engine
until fumes have been eliminated.

____________________________________________________

1.d. Keep all equipment safety guards, covers and devices in

position and in good repair.Keep hands, hair, clothing and
tools away from V-belts, gears, fans and all other moving
parts when starting, operating or repairing equipment.

____________________________________________________

1.e. In some cases it may be necessary to remove safety
guards to perform required maintenance. Remove
guards only when necessary and replace them when the
maintenance requiring their removal is complete.
Always use the greatest care when working near moving
parts.

___________________________________________________

1.f. Do not put your hands near the engine fan. Do not attempt
to override the governor or idler by pushing on the throttle
control rods while the engine is running.

___________________________________________________

1.g. To prevent accidentally starting gasoline engines while
turning the engine or welding generator during maintenance
work, disconnect the spark plug wires, distributor cap or
magneto wire as appropriate.

i

SAFETY

i

ARC WELDING CAN BE HAZARDOUS. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH.
KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING.

Read and understand the following safety highlights. For additional safety information, it is strongly recommended that you
purchase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box
351040, Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available
from the Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.

BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE
PERFORMED ONLY BY QUALIFIED INDIVIDUALS.

WARNING

Mar ‘95

ELECTRIC AND
MAGNETIC FIELDS
may be dangerous

2.a. Electric current flowing through any conductor causes
localized Electric and Magnetic Fields (EMF). Welding
current creates EMF fields around welding cables and
welding machines

2.b. EMF fields may interfere with some pacemakers, and
welders having a pacemaker should consult their physician
before welding.

2.c. Exposure to EMF fields in welding may have other health
effects which are now not known.

2.d. All welders should use the following procedures in order to
minimize exposure to EMF fields from the welding circuit:

2.d.1.

Route the electrode and work cables together - Secure
them with tape when possible.

2.d.2. Never coil the electrode lead around your body.

2.d.3. Do not place your body between the electrode and

work cables. If the electrode cable is on your right
side, the work cable should also be on your right side.

2.d.4. Connect the work cable to the workpiece as close as

possible to the area being welded.

2.d.5. Do not work next to welding power source.

1.h. To avoid scalding, do not remove the
radiator pressure cap when the engine is
hot.

CALIFORNIA PROPOSITION 65 WARNINGS

Diesel engine exhaust and some of its constituents
are known to the State of California to cause can­cer, birth defects, and other reproductive harm.

The engine exhaust from this product contains
chemicals known to the State of California to cause
cancer, birth defects, or other reproductive harm.

The Above For Diesel Engines

The Above For Gasoline Engines

ii

SAFETY

ii

ARC RAYS can burn.

4.a. Use a shield with the proper filter and cover
plates to protect your eyes from sparks and
the rays of the arc when welding or observing
open arc welding. Headshield and filter lens
should conform to ANSI Z87. I standards.

4.b. Use suitable clothing made from durable flame-resistant
material to protect your skin and that of your helpers from
the arc rays.

4.c. Protect other nearby personnel with suitable, non-flammable
screening and/or warn them not to watch the arc nor expose
themselves to the arc rays or to hot spatter or metal.

ELECTRIC SHOCK can
kill.

3.a. The electrode and work (or ground) circuits
are electrically “hot” when the welder is on.
Do not touch these “hot” parts with your bare
skin or wet clothing. Wear dry, hole-free

gloves to insulate hands.

3.b. Insulate yourself from work and ground using dry insulation.
Make certain the insulation is large enough to cover your full
area of physical contact with work and ground.

In addition to the normal safety precautions, if welding
must be performed under electrically hazardous
conditions (in damp locations or while wearing wet
clothing; on metal structures such as floors, gratings or
scaffolds; when in cramped positions such as sitting,
kneeling or lying, if there is a high risk of unavoidable or
accidental contact with the workpiece or ground) use
the following equipment:

• Semiautomatic DC Constant Voltage (Wire) Welder.

• DC Manual (Stick) Welder.

• AC Welder with Reduced Voltage Control.

3.c. In semiautomatic or automatic wire welding, the electrode,
electrode reel, welding head, nozzle or semiautomatic
welding gun are also electrically “hot”.

3.d. Always be sure the work cable makes a good electrical
connection with the metal being welded. The connection
should be as close as possible to the area being welded.

3.e. Ground the work or metal to be welded to a good electrical
(earth) ground.

3.f.

Maintain the electrode holder, work clamp, welding cable and
welding machine in good, safe operating condition. Replace
damaged insulation.

3.g. Never dip the electrode in water for cooling.

3.h. Never simultaneously touch electrically “hot” parts of
electrode holders connected to two welders because voltage
between the two can be the total of the open circuit voltage
of both welders.

3.i. When working above floor level, use a safety belt to protect
yourself from a fall should you get a shock.

3.j. Also see Items 6.c. and 8.

FUMES AND GASES
can be dangerous.

5.a. Welding may produce fumes and gases
hazardous to health. Avoid breathing these
fumes and gases.When welding, keep
your head out of the fume. Use enough
ventilation and/or exhaust at the arc to keep

fumes and gases away from the breathing zone. When

welding with electrodes which require special
ventilation such as stainless or hard facing (see
instructions on container or MSDS) or on lead or
cadmium plated steel and other metals or coatings
which produce highly toxic fumes, keep exposure as
low as possible and below Threshold Limit Values (TLV)
using local exhaust or mechanical ventilation. In
confined spaces or in some circumstances, outdoors, a
respirator may be required. Additional precautions are
also required when welding on galvanized steel.

5.b.

Do not weld in locations near chlorinated hydrocarbon

vapors
coming from degreasing, cleaning or spraying operations.
The heat and rays of the arc can react with solvent vapors

to
form phosgene, a highly toxic gas, and other irritating
products.

5.c. Shielding gases used for arc welding can displace air and
cause injury or death. Always use enough ventilation,
especially in confined areas, to insure breathing air is safe.

5.d. Read and understand the manufacturer’s instructions for this

equipment and the consumables to be used, including the
material safety data sheet (MSDS) and follow your
employer’s safety practices. MSDS forms are available from
your welding distributor or from the manufacturer.

5.e. Also see item 1.b.

Mar ‘95

FOR ELECTRICALLY
powered equipment.

8.a. Turn off input power using the disconnect
switch at the fuse box before working on
the equipment.

8.b. Install equipment in accordance with the U.S. National
Electrical Code, all local codes and the manufacturer’s
recommendations.

8.c. Ground the equipment in accordance with the U.S. National
Electrical Code and the manufacturer’s recommendations.

CYLINDER may explode
if damaged.

7.a. Use only compressed gas cylinders
containing the correct shielding gas for the
process used and properly operating
regulators designed for the gas and

pressure used. All hoses, fittings, etc. should be suitable for
the application and maintained in good condition.

7.b. Always keep cylinders in an upright position securely
chained to an undercarriage or fixed support.

7.c. Cylinders should be located:

• Away from areas where they may be struck or subjected to

physical damage.

• A safe distance from arc welding or cutting operations and

any other source of heat, sparks, or flame.

7.d. Never allow the electrode, electrode holder or any other
electrically “hot” parts to touch a cylinder.

7.e. Keep your head and face away from the cylinder valve outlet
when opening the cylinder valve.

7.f. Valve protection caps should always be in place and hand
tight except when the cylinder is in use or connected for
use.

7.g. Read and follow the instructions on compressed gas
cylinders, associated equipment, and CGA publication P-l,
“Precautions for Safe Handling of Compressed Gases in
Cylinders,” available from the Compressed Gas Association
1235 Jefferson Davis Highway, Arlington, VA 22202.

iii

SAFETY

iii

Mar ‘95

WELDING SPARKS can
cause fire or explosion.

6.a.

Remove fire hazards from the welding area.

If this is not possible, cover them to prevent

the welding sparks from starting a fire.

Remember that welding sparks and hot
materials from welding can easily go through small cracks
and openings to adjacent areas. Avoid welding near
hydraulic lines. Have a fire extinguisher readily available.

6.b. Where compressed gases are to be used at the job site,
special precautions should be used to prevent hazardous
situations. Refer to “Safety in Welding and Cutting” (ANSI
Standard Z49.1) and the operating information for the
equipment being used.

6.c. When not welding, make certain no part of the electrode
circuit is touching the work or ground. Accidental contact
can cause overheating and create a fire hazard.

6.d. Do not heat, cut or weld tanks, drums or containers until the
proper steps have been taken to insure that such procedures
will not cause flammable or toxic vapors from substances
inside. They can cause an explosion even

though

they have
been “cleaned”. For information, purchase “Recommended
Safe Practices for the

Preparation

for Welding and Cutting of
Containers and Piping That Have Held Hazardous
Substances”, AWS F4.1 from the American Welding Society

(see address above).

6.e. Vent hollow castings or containers before heating, cutting or
welding. They may explode.

6.f.

Sparks and spatter are thrown from the welding arc. Wear oil
free protective garments such as leather gloves, heavy shirt,
cuffless trousers, high shoes and a cap over your hair. Wear
ear plugs when welding out of position or in confined places.
Always wear safety glasses with side shields when in a
welding area.

6.g. Connect the work cable to the work as close to the welding
area as practical. Work cables connected to the building
framework or other locations away from the welding area
increase the possibility of the welding current passing
through lifting chains, crane cables or other alternate cir­cuits. This can create fire hazards or overheat lifting chains
or cables until they fail.

6.h. Also see item 1.c.

iv

SAFETY

iv

PRÉCAUTIONS DE SÛRETÉ

Pour votre propre protection lire et observer toutes les instructions
et les précautions de sûreté specifiques qui parraissent dans ce
manuel aussi bien que les précautions de sûreté générales suiv­antes:

Sûreté Pour Soudage A L’Arc

1. Protegez-vous contre la secousse électrique:

a. Les circuits à l’électrode et à la piéce sont sous tension

quand la machine à souder est en marche. Eviter toujours
tout contact entre les parties sous tension et la peau nue
ou les vétements mouillés. Porter des gants secs et sans
trous pour isoler les mains.

b. Faire trés attention de bien s’isoler de la masse quand on

soude dans des endroits humides, ou sur un plancher
metallique ou des grilles metalliques, principalement dans
les positions assis ou couché pour lesquelles une grande
partie du corps peut être en contact avec la masse.

c. Maintenir le porte-électrode, la pince de masse, le câble

de soudage et la machine à souder en bon et sûr état
defonctionnement.

d.Ne jamais plonger le porte-électrode dans l’eau pour le

refroidir.

e. Ne jamais toucher simultanément les parties sous tension

des porte-électrodes connectés à deux machines à souder
parce que la tension entre les deux pinces peut être le
total de la tension à vide des deux machines.

f. Si on utilise la machine à souder comme une source de

courant pour soudage semi-automatique, ces precautions
pour le porte-électrode s’applicuent aussi au pistolet de
soudage.

2. Dans le cas de travail au dessus du niveau du sol, se protéger
contre les chutes dans le cas ou on recoit un choc. Ne jamais
enrouler le câble-électrode autour de n’importe quelle partie
du corps.

3. Un coup d’arc peut être plus sévère qu’un coup de soliel,
donc:

a. Utiliser un bon masque avec un verre filtrant approprié

ainsi qu’un verre blanc afin de se protéger les yeux du ray­onnement de l’arc et des projections quand on soude ou
quand on regarde l’arc.

b. Porter des vêtements convenables afin de protéger la

peau de soudeur et des aides contre le rayonnement de
l‘arc.

c. Protéger l’autre personnel travaillant à proximité au

soudage à l’aide d’écrans appropriés et non-inflammables.

4. Des gouttes de laitier en fusion sont émises de l’arc de
soudage. Se protéger avec des vêtements de protection libres
de l’huile, tels que les gants en cuir, chemise épaisse, pan­talons sans revers, et chaussures montantes.

5. Toujours porter des lunettes de sécurité dans la zone de
soudage. Utiliser des lunettes avec écrans lateraux dans les
zones où l’on pique le laitier.

6. Eloigner les matériaux inflammables ou les recouvrir afin de
prévenir tout risque d’incendie dû aux étincelles.

7. Quand on ne soude pas, poser la pince à une endroit isolé de
la masse. Un court-circuit accidental peut provoquer un
échauffement et un risque d’incendie.

8. S’assurer que la masse est connectée le plus prés possible
de la zone de travail qu’il est pratique de le faire. Si on place
la masse sur la charpente de la construction ou d’autres
endroits éloignés de la zone de travail, on augmente le risque
de voir passer le courant de soudage par les chaines de lev­age, câbles de grue, ou autres circuits. Cela peut provoquer
des risques d’incendie ou d’echauffement des chaines et des
câbles jusqu’à ce qu’ils se rompent.

9. Assurer une ventilation suffisante dans la zone de soudage.
Ceci est particuliérement important pour le soudage de tôles
galvanisées plombées, ou cadmiées ou tout autre métal qui
produit des fumeés toxiques.

10. Ne pas souder en présence de vapeurs de chlore provenant
d’opérations de dégraissage, nettoyage ou pistolage. La
chaleur ou les rayons de l’arc peuvent réagir avec les vapeurs
du solvant pour produire du phosgéne (gas fortement toxique)
ou autres produits irritants.

11. Pour obtenir de plus amples renseignements sur la sûreté,
voir le code “Code for safety in welding and cutting” CSA
Standard W 117.2-1974.

PRÉCAUTIONS DE SÛRETÉ POUR
LES MACHINES À SOUDER À
TRANSFORMATEUR ET À
REDRESSEUR

1. Relier à la terre le chassis du poste conformement au code de
l’électricité et aux recommendations du fabricant. Le dispositif
de montage ou la piece à souder doit être branché à une
bonne mise à la terre.

2. Autant que possible, I’installation et l’entretien du poste seront
effectués par un électricien qualifié.

3. Avant de faires des travaux à l’interieur de poste, la debranch­er à l’interrupteur à la boite de fusibles.

4. Garder tous les couvercles et dispositifs de sûreté à leur
place.

Mar. ‘93

vv

Thank You

for selecting a QUALITY product by Lincoln Electric. We want you
to take pride in operating this Lincoln Electric Company product

••• as much pride as we have in bringing this product to you!

Read this Operators Manual completely before attempting to use this equipment. Save this manual and keep it
handy for quick reference. Pay particular attention to the safety instructions we have provided for your protection.
The level of seriousness to be applied to each is explained below:

WARNING

This statement appears where the information must be followed exactly to avoid serious personal injury or
loss of life.

This statement appears where the information must be followed to avoid minor personal injury or damage to
this equipment.

CAUTION

Please Examine Carton and Equipment For Damage Immediately

When this equipment is shipped, title passes to the purchaser upon receipt by the carrier. Consequently, Claims
for material damaged in shipment must be made by the purchaser against the transportation company at the
time the shipment is received.

Please record your equipment identification information below for future reference. This information can be
found on your machine nameplate.

Product _________________________________________________________________________________

Model Number ___________________________________________________________________________

Code Number or Date Code_________________________________________________________________

Serial Number____________________________________________________________________________

Date Purchased___________________________________________________________________________

Where Purchased_________________________________________________________________________

Whenever you request replacement parts or information on this equipment, always supply the information you
have recorded above. The code number is especially important when identifying the correct replacement parts.

On-Line Product Registration

- Register your machine with Lincoln Electric either via fax or over the Internet.

• For faxing: Complete the form on the back of the warranty statement included in the literature packet
accompanying this machine and fax the form per the instructions printed on it.

• For On-Line Registration: Go to our

WEB SITE at www.lincolnelectric.com. Choose “Quick Links” and then

“Product Registration”. Please complete the form and submit your registration.

vi

vi

TABLE OF CONTENTS

Page

Installation .......................................................................................................Section A

Technical Specifications ........................................................................................A-1

Safety Precautions.................................................................................................A-2

Identify and Locate Components...........................................................................A-2

Select Suitable Location ........................................................................................A-3

Output Connections...............................................................................................A-3

Work Clamp Installation ..................................................................................A-3

Work Cable Installation ...................................................................................A-3

Gun Installation......................................................................................................A-4

Gas Connection.....................................................................................................A-5

Input Connections..................................................................................................A-6

Line Cord Connection............................................................................................A-6

230 Volt Input Connection .....................................................................................A-6

208 Volt Input Connection .....................................................................................A-6

Operation .........................................................................................................Section B

Safety Precautions ................................................................................................B-1

General Description...............................................................................................B-2

Design Features and Advantages .........................................................................B-2

Welding Capability.................................................................................................B-2

Limitations..............................................................................................................B-2

Controls and Settings ............................................................................................B-2

Welding Operations ...............................................................................................B-3

Wire Loading ...................................................................................................B-3

Wire Threading................................................................................................B-4

Making a Weld ................................................................................................B-5

Process Guidelines................................................................................................B-5

Chaning Over to Feed Other Wire Sizes ...............................................................B-6

Welding with GMAW..............................................................................................B-6

Welding with FCAW...............................................................................................B-6

Overload Protection...............................................................................................B-6

Application Chart .................................................................................................B-18

Accessories.....................................................................................................Section C

Accessories ...........................................................................................................C-1

Replacement Parts................................................................................................C-2

Maintenance ....................................................................................................Section D

Safety Precautions ................................................................................................D-1

Routine Maintenance.............................................................................................D-1

Gun and Cable Maintenance.................................................................................D-2

Configuration of Components in Wire Feeding System.........................................D-2

Component Replacement Procedures ..................................................................D-3

Changing Liner ......................................................................................................D-4

Gun Handle Parts..................................................................................................D-4

Troubleshooting..............................................................................................Section E

How to Use Troubleshooting Guide.......................................................................E-1

Troubleshooting Guide.........................................................................E-2 THRU E-4

Wiring Diagrams..............................................................................................Section F

PRO-MIG 175 Wiring Diagram ..............................................................................F-1

PRO-MIG 175 Parts .....................................................................P471 Series & P202-E

A-1 A-1

INSTALLATION

Fuse or

Output Mode Input Voltage Breaker Size Input Amps Power Cord

RATED 230V/60Hz 40 Super Lag 20/22 50 Amp, 250V,

208V/60Hz Three-Prong Plug

(NEMA Type 6-50P)

TECHNICAL SPECIFICATIONS – Pro-MIG 175

INPUT – SINGLE PHASE ONLY

RATED OUTPUT

OUTPUT

RECOMMENDED INPUT CABLE AND FUSE SIZES

Height Width Depth Weight

12.0 in 9.75 in 16.5 in 57 Ibs
305 mm 248 mm 419 mm 25.9 kg

PHYSICAL DIMENSIONS

Standard Voltage/Frequency Input Current

230V/60Hz 20 Amps – Rated Output
208V/60Hz 22 Amps – Rated Output

Duty

Cycle Current Volts at Rated Amperes

30% Duty Cycle @ 230V/60Hz 130 Amps 20V
25% Duty Cycle @ 208V/60Hz 130 Amps 20V

Welding Current Range Maximum Open Circuit Voltage Wire Speed Range

Rated DC Output: 30 – 175 amps 33V 50-400IPM (1.3-10.2m/min)

Pro-MIG 175

A-2

A-2

INSTALLATION

SAFETY PRECAUTIONS

Read entire installation section before starting
installation.

IDENTIFY AND LOCATE
COMPONENTS

If you have not already done so, unpack the Pro-MIG
175 from its carton and remove all packing material
around the Pro-MIG 175. Remove the following loose
items from the carton (see Figure A.1):

1. Pro-MIG 175

2. Gun and cable assembly

(1)

3. Literature and miscellaneous including:

a) This operating manual

b) 2 extra .023"-.025” (0.6 mm) contact tips

c) 3 extra .035” (0.9 mm) contact tips

d) Hex key wrench for removal of drive roll.

4. 10 ft (3.0 m) work cable.

5. Work clamp.

6. a) 2 lb. spool of .025” (0.6 mm) Super Arc L-56
MIG wire.

b) Sample spool of Innershield .035” (0.9 mm)

NR-211-MP.

7. Hand shield with filter plate and lens.

8. Adjustable mixed-Gas Regulator & Hose.

9. Instructional video.

10. Gasless Nozzle.

For available options and accessories refer to the
Accessories Section of this manual.

1)

As shipped from the factory, the Pro-MIG 175 gun liner is
ready to feed .023” (0.6 mm) -.035 (0.9 mm) wire. The
contact tip is sized for .023”-.025” (0.6

mm) wire.

ELECTRIC SHOCK can kill.

• Only qualified personnel should perform
this installation.

• Only personnel that have read and under­stood the PRO-MIG 175 Operating Manual
should install and operate this equipment.

• Machine must be plugged into a receptacle
which is grounded per any national, local
or other applicable electrical codes.

• The PRO-MIG 175 power switch is to be in
the OFF (“O”) position when installing
work cable and gun and when connecting
power cord to input power.

WARNING

FIGURE A.1

1

2

3

4

6

7

8

5

9

10

Pro-MIG 175

A-3

A-3

INSTALLATION

SELECT SUITABLE LOCATION

Locate the welder in a dry location where there is free
circulation of clean air into the louvers in the back and
out the front of the unit. A location that minimizes the
amount of smoke and dirt drawn into the rear louvers
reduces the chance of dirt accumulation that can block
air passages and cause overheating.

STACKING

Pro-MIG 175’s cannot be stacked.

TILTING

Each machine must be placed on a secure, level sur­face, either directly or on the recommended cart. The
machine may topple over if this procedure is not fol­lowed.

OUTPUT CONNECTIONS

Refer to Figure A.2.

1. Work Cable Access Hole.

2. Gun Cable and Control Lead Access Hole.

3. Connector Block.

4. Gun Trigger Lead Connectors.

5. Positive (+) and negative (–) output terminals.

6. Wire Feed Gearbox.

7. Cable Hanger.

8. Thumbscrew.

Refer to the Accessories Section for available optional
equipment.

Work Clamp Installation

Attach the work clamp per the following: Refer to
Figure A-3.

Pro-MIG“ 175

4

5

8

3

6

7

1

2

DO NOT SWITCH
WHEN WELDING

+

-

FIGURE A.3

1. Insert the work cable terminal lug with the larger
hole through the strain relief hole in the work clamp
as shown above.

2. Fasten securely with the bolt and nut provided.

FIGURE A.2

Pro-MIG 175

A-4

A-4

INSTALLATION

Work Cable Installation

Refer to Figure A.2.

1. Open the wire feed section door on the right side of
the Pro-MIG 175.

2. Pass the end of the work cable that has the termi­nal lug with the smaller hole through the Work
Cable Access Hole (1) in the case front.

3. Route the cable under and around the back of the
Wire Feed Gearbox (6).

4. For GMAW Only: Refer to Figure A.2. As deliv-
ered, the machine is connected for positive elec­trode polarity. This is the appropriate configuration
for the GMAW (MIG) process. To complete installa­tion, use the provided wing nut to connect the work
cable’s terminal lug to the negative (–) output ter­minal (5) located above the Wire Feed Gearbox
(6). Make sure that both wing nuts are tight.

5. For Innershield Only: Refer to Figure A.4. To wire
for negative polarity (required for the Innershield
process), connect the short cable attached to the
connector block (1) to the negative (–) output termi­nal (2) and the work cable (3) to the positive (+) ter­minal (4).

FIGURE A.4

NOTE: If .035" or .045" (0.9 mm or 1.2 mm)

Innershield flux-cored wire is to be used, the appropri­ate Innershield kit is required. (see ACCESSORIES
section)

Connecting Gun Cable to the Pro-MIG 175

1. Refer to Figure A.2. Unplug the machine or turn
power switch to the OFF “O” position.

2. Pass the insulated terminals of the gun trigger con­trol leads, one at a time, through the Gun Cable
and Control Lead Access Slot (2) in the case front.
The leads are to be routed up the inside of the
case front, behind the gas line.

3. Insert the connector on the gun conductor cable
through the Gun Cable Access Hole (2) in the
Pro-MIG 175 case front. Make sure the connector
is all the way in the brass connector block to obtain
proper gas flow. If the gun connector will not fully
insert, unscrew the thumbscrew on the connector
block a few turns. Rotate the connector so control
leads are on the underside and tighten the
Thumbscrew on the connector block.

4. Connect the gun trigger control lead terminals to
the two insulated 1/4" (6,4 mm) tab terminal con­nector bushings located above the “Gun Trigger
Connection” decal in the wire feed section (4).
Either lead can go to either connector.

If the gun trigger switch being used is other than
that supplied, the switch must be a normally open,
momentary switch. The terminals of the switch
must be insulated from the welding circuit.
Malfunction of the Pro-MIG 175 may result if this
switch shorts to the Pro-MIG 175 welding output
circuit or is common to any electrical circuit other
than the Pro-MIG 175 trigger circuit.

CAUTION

GUN INSTALLATION

As shipped from the factory, the Pro-MIG 175 gun is
ready to feed .023" – .025" solid wire. If .030"-.035”
(0.8 -.09mm) solid wire is to be used, change the con­tact tip to the appropriate size. If .035” Flux-cored wire
is to be used, change the contact tip and nozzle to the
appropiate type and orient the drive roll to the appro­priate groove size.

2

4

3

1

Pro-MIG 175