Lincoln Electric SQUARE WAVE TIG 175 PRO User Manual

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Square Wave TIG 175 PRO

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IM688

January, 2000

For use with machines having Code Numbers:

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.

10734

Date of Purchase: Serial Number: Code Number: Model: Where Purchased:

Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

OPERATOR’S MANUAL

• World's Leader in Welding and Cutting Products •

• Sales and Service through Subsidiaries and Distributors Worldwide •

Page 2

SAFETY

WARNING

CALIFORNIA PROPOSITION 65 WARNINGS

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

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.

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

FOR ENGINE powered equipment.

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

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1.b.Operate engines in open, well-ventilated areas or vent the engine exhaust fumes outdoors.

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1.c. Do not add the fuel near an open flame weld-

ing 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.

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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.

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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.

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

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.

___________________________________________________

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.

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.

Mar ‘95

Page 3

SAFETY

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.

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.

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

vapors

5.e. Also see item 1.b.

Mar ‘95

Page 4

iii

SAFETY

iii

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.

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

Sparks and spatter are thrown from the welding arc. Wear oil

6.f. 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.

Remember that welding sparks and hot

though

they have

Preparation

for Welding and Cutting of

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.

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.

Mar ‘95

Page 5

SAFETY

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.

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.

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.

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

Page 6

for selecting a QUALITY product by Lincoln Electric. We want you

Thank You

to take pride in operating this Lincoln Electric Company product ••• as much pride as we have in bringing this product to you!

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.

Model Name & Number _____________________________________

Code & Serial Number _____________________________________

Date of Purchase _____________________________________

Whenever you request replacement parts for or information on this equipment always supply the information you have recorded above.

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.

CAUTION

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

Page 7

TABLE OF CONTENTS

Page

SAFETY .........................................................................................................................i-iv

INSTALLATION SECTION .................................................................................................1

TECHNICAL SPECIFICATIONS......................................................................................1

SELECT SUITABLE LOCATION......................................................................................2

STACKING ................................................................................................................2

LIFTING & MOVING .................................................................................................2

TILTING .....................................................................................................................2

ENVIRONMENTAL RATING ............................................................................................2

MACHINE GROUNDING AND HIGH FREQUENCY INTERFERENCE PROTECTION.2

INPUT CONNECTIONS ..................................................................................................3

INPUT RECONNECT PROCEDURE ..............................................................................3

OUTPUT CONNECTIONS ..............................................................................................4

CONNECTIONS FOR TIG (GTAW) WELDING.........................................................4

TIG TORCH CONNECTION ...............................................................................4

WORK CABLE CONNECTION...........................................................................4

SHIELDING GAS CONNECTION ......................................................................4

REMOTE CONTROL CONNECTION.................................................................5

CONNECTIONS FOR STICK (SMAW) WELDING ..................................................5

STICK ELECTRODE CABLE AND WORK CABLE CONNECTION ..................5

vivi

OPERATION SECTION ......................................................................................................6

SAFETY PRECAUTIONS................................................................................................6

GENERAL DESCRIPTION..............................................................................................6

INCLUDED EQUIPMENT .........................................................................................6

FOR GTAW (TIG WELDING):.............................................................................6

FOR SMAW (STICK WELDING): .......................................................................6

FOR INSTALLATION AND STARTUP: ...............................................................6

WELDING CAPABILITY ............................................................................................6

CONTROLS AND SETTINGS .........................................................................................7

OPERATING STEPS .......................................................................................................8

WELDING IN TIG MODE..........................................................................................8

AMPTROL

BENEFITS OF THE SQUARE WAVE DESIGN..................................................8

WELDING IN STICK MODE ....................................................................................9

ACCESSORIES SECTION...............................................................................................10

MAINTENANCE SECTION ..............................................................................................11

TROUBLESHOOTING SECTION.....................................................................................12

DIAGRAM SECTION........................................................................................................19

WIRING DIAGRAM........................................................................................................20

ACCESSORY OPERATION...........................................................8

PARTS LISTS.....................................................................................................APPENDIX

Page 8

INSTALLATION

TECHNICAL SPECIFICATIONS - Square Wave TIG 175 PRO (K1582-2 only)

INPUT - SINGLE PHASE ONLY

Standard

Voltage

240/380/415/1/50/60

Additional Lincoln Rating 220-240/400-415/1/50/60

54/33/30 AC/DC Stick & DC TIG, 71/41/37 AC TIG

54/30 AC/DC Stick & DC TIG, 71/37 AC TIG

RATED OUTPUT

Duty Cycle

GTAW 25% Duty Cycle

40% Duty Cycle 60% Duty Cycle

100% Duty Cycle

Input Current at

Rated Output

Amps

150 125 110

olts at Rated Amperes

Code

Number

10734

14.8 V AC/DC

14.5 V AC/DC

14.3 V AC/DC

14.0 V AC/DC

Input

Voltage /

phase/

Frequency

240/1/50

380/1/50

415/1/50

220/1/50

400/1/50

SMAW 25% Duty Cycle

40% Duty Cycle 60% Duty Cycle

100% Duty Cycle

Output Current

Rang

10-175 Amps

AC and DC

RECOMMENDED INPUT WIRE AND FUSE SIZES

For AC/DC Stick and DC TIG Welding at 150A/25%

Duty Cycle and for AC TIG Welding up to

110A/25% Duty Cycle. Based on the 1996 U.S.

National Electrical Code

Fuse

(Super Lag)

or Breaker

Size

100

Input

Ampere

Rating on

Nameplate

Type 75°C

Copper Wire in

Conduit AWG

(IEC) Sizes

10 (5.2 mm2)

14 (2.1 mm2)

10 (5.2 mm2)

14 (2.1 mm2)

Copper Ground

Conduit AWG

10 (5.2 mm2)

14 (2.1 mm2)

10 (5.2 mm2)

14 (2.1 mm2)

150 125 110

OUTPUT

Maximum Open

cuit Voltage

Cir

(STICK AND TIG)

AC OCV: 78 DC OCV: 64

Type 75°C

Wire in

(IEC) Sizes

(Super Lag)

or Breaker

26.0 V AC/DC

25.0 V AC/DC

24.4 V AC/DC

23.4 V AC/DC

ype of Output

CC (Constant Current)

AC/DC

(1)

For AC TIG Welding at 150 A/25% Duty

Cycle, Based on the 1996 U.S. National

Electrical Code

Fuse

Size

125

Input

Ampere

Rating on

Nameplate

Type 75°C

Copper Wire in

Conduit AWG

(IEC) Sizes

8 (8.2 mm2)

12 (3.3 mm2)

8 (8.2 mm2)

12 (3.3 mm2)

Type 75°C

Copper Ground

Wire in

Conduit AWG

(IEC) Sizes

8 (8.2 mm2)

12 (3.3 mm2)

8 (8.2 mm2)

12 (3.3 mm2)

(1)

The National Electrical Code permits operation at rated output and duty cycle from a 50 amp receptacle when supply lines and fuses are sized per this table.

PHYSICAL DIMENSIONS

Height Width Depth Weight

Power 19.53 in. 13.72 in. 24.94 in. Approx. 200 lbs. Source

Power Source 27.93 in. 19.22 in. 36.74 in. Approx. 230 lbs.

Undercarriage

496 mm 349 mm 633 mm 90.9 kgs.

709 mm 488 mm 933 mm 105 kgs.

SQUARE WAVE TIG 175 PRO

Page 9

INSTALLATION

Read entire installation section before starting installation.

Safety Precautions

WARNING

ELECTRIC SHOCK can kill.

• Only qualified personnel should perform this installation.

• Turn the input power OFF at the disconnect switch or fuse box before working on this equipment.

• Do not touch electrically hot parts.

• Always connect the Square Wave TIG 175 PRO to a power supply grounded per the National Electrical Code and any local

SELECT SUITABLE LOCATION

Place the welder where clean cooling air can freely circulate in through the rear louvers and out through the front and side louvers. Dirt, dust or any foreign material that can be drawn into the welder should be kept at a minimum. Failure to observe these precautions can result in excessive operating temperatures and nuisance shut-downs.

STACKING

Square Wave TIG 175 PRO’s cannot

LIFTING AND MOVING

The Square Wave TIG 175 PRO should be lifted by two or more people or with a hoist. (It weighs approximately 200 lbs./90.9 kg.) Its lifting handles are designed to

make lifting more convenient. An optional undercarriage is available to easily move the unit. Refer to the Accessories section of this manual.

TILTING

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

ENVIRONMENTAL RATING

be stacked.

MACHINE GROUNDING AND HIGH FREQUENCY INTERFERENCE PROTECTION

The welder must be grounded. See your local and national electrical codes for proper grounding methods.

The high frequency generator, being similar to a radio transmitter, can be blamed for radio, TV and electronic equipment interference problems. These problems may be the result of radiated interference. Proper grounding methods can reduce or eliminate radiated interference.

Radiated interference can develop in the following four ways:

1. Direct interference radiated from the welder.

2. Direct interference radiated from the welding leads.

3. Direct interference radiated from feedback into the power lines.

4. Interference from re-radiation of “pickup” by ungrounded metallic objects.

Keeping these contributing factors in mind, installing equipment per the following instructions should minimize problems.

1. Keep the welder power supply lines as short as possible and enclose as much of them as possible in rigid metallic conduit or equivalent shielding for a distance of 50 feet (15.2m). There should be good electrical contact between this conduit and the welder case ground. Both ends of the conduit should be connected to a driven ground and the entire length should be continuous.

2. Keep the work and electrode leads as short as possible and as close together as possible. Lengths should not exceed 25 ft (7.6m). Tape the leads together when practical.

3. Be sure the torch and work cable rubber coverings are free of cuts and cracks that allow high frequency leakage.

The Square Wave TIG 175 PRO power source carries an IP21 environmental rating. It may be used in normal industrial and commercial environments. Avoid using it in environments which have falling water such as rain. Read and follow “Electric Shock Warnings” in the Safety section if welding must be performed under electrically hazardous conditions such as welding in wet areas or on or in the workpiece.

SQUARE WAVE TIG 175 PRO

4. Keep the torch in good repair and all connections tight to reduce high frequency leakage.

5. The work piece must be connected to an earth ground close to the work clamp, using one of the following methods:

a) A metal underground water pipe in direct contact

with the earth for ten feet or more.

Page 10

INSTALLATION

b) A 3/4” (19mm) galvanized pipe or a 5/8” (16mm)

solid galvanized iron, steel or copper rod driven at least eight feet into the ground.

The ground should be securely made and the grounding cable should be as short as possible using cable of the same size as the work cable, or larger. Grounding to the building frame electrical conduit or a long pipe system can result in re-radiation, effectively making these members radiating antennas.

6. Keep cover and all screws securely in place.

7. Electrical conductors within 50 ft (15.2m) of the welder should be enclosed in grounded rigid metallic conduit or equivalent shielding, wherever possible. Flexible metallic conduit is generally not suitable.

8. When the welder is enclosed in a metal building, the metal building should be connected to several good earth driven electrical grounds (as in 5 (b) above) around the periphery of the building.

Failure to observe these recommended installation procedures can cause radio or TV and electronic equipment interference problems and result in unsatisfactory welding performance resulting from lost high frequency power.

Refer to the of this section. Fuse the input circuit with the recommended

super lag fuses or delay type1circuit breakers. Using fuses or circuit breakers smaller than recommended may result in “nuisance” shut-offs from welder inrush currents even if not welding at high currents.

Technical Specifications

page at the beginning

INPUT RECONNECT PROCEDURE

On multiple input voltage welders, be sure the machine is connected per the following instructions for the voltage being supplied to the welder.

CAUTION

Failure to follow these instructions can cause immediate failure of components within the welder.

___________________________________________

Multiple voltage models are shipped connected for the highest voltage. To change this connection refer to the following instructions.

WARNING

ELECTRIC SHOCK can kill.

• Turn the input power OFF at the disconnect switch or fuse box before working on this equipment.

INPUT SUPPLY CONNECTIONS

Be sure the voltage, phase, and frequency of the input power is as specified on the rating plate, located on the rear of the machine.

1. Connect terminal marked to earth ground per National Electric Code or any local codes.

2. Connect the supply lines to the line switch studs as shown in figure A.1.Use insulated barrel type terminals to fit #1032 studs. Torque each nut to 3.0 Nm.

3. Install in accordance with all local and national electrical codes.

The Square Wave TIG is supplied with one cord connector. The cord connector provides a strain relief for the input power cord as it passes through the rear access hole. The cord connector is designed for a cord diameter of 14.2 to 25.4 mm (.560 to 1.00 in.). Strip away outer jacket of cord, trim fillers and insert conductors mthrough cord connector. The jacketed portion of the cord must go through the cord connector. Tighten both connector screws.

Also called “inverse time” or “thermal/magnetic” circuit breakers; circuit breakers which have a delay in tripping action that decreases as the magnitude of the current increases.

For 220-240V connection (Refer to figure A.1):

1. Remove the sheet metal cover.

Disconnect the copper link between the switch stud and H4.

3. Connect the copper link from the switch stud to H2 and tighten nuts securely.

4. Replace sheet metal cover and all screws.

For 380V connection (Refer to figure A.1):

1. Remove the sheet metal cover.

Disconnect the copper link between the switch stud and H4.

3. Connect the copper link from the switch stud to H3 and tighten nuts securely.

4. Replace sheet metal cover and all screws.

For 400-415V connection (Refer to figure A.1):

1. Remove the sheet metal cover.

Disconnect the copper link between the switch stud and H2 or H3.

3. Connect the copper link from the switch stud to H4 and tighten nuts securely.

4. Replace sheet metal cover and all screws.

SQUARE WAVE TIG 175 PRO

Page 11

INSTALLATION

INPUT LEADS L1 & L2 USE INSULATED BARREL RING TERMINALS TO FIT #10-32 STUDS PROVIDED.

INPUT SUPPLY CONNECTION

FOR 220-240V: CONNECT COPPER LINK TO H2 FOR 380V: CONNECT COPPER LINK TO H3 FOR 400-415V: CONNECT COPPER LINK TO H4 (AS SHOWN)

FIGURE A.1 Reconnect Leads

OUTPUT CONNECTIONS

(DO NOT REMOVE)

Electrode/Gas Output Receptacle on the front of the welder and turn it clockwise until it is tight. This is a quick connect terminal and also provides the gas connection for the shielding gas to the torch.

WARNING

To avoid receiving a high frequency shock, keep the TIG torch and cables in good condition.

__________________________________________

WORK CABLE CONNECTION

A work cable with attached work clamp is factory connected to the Square Wave TIG 175 PRO. To minimize high frequency interference, refer to

Grounding and High Frequency Interference Protection

section of this manual for the proper pro-

cedure on grounding the work clamp and work piece.

SHIELDING GAS CONNECTION

Obtain the necessary inert shielding gas (usually argon). Connect a cylinder of gas with a pressure regulator and flow gage. Install a gas hose between the regulator and gas inlet (located on the rear of the welder). The gas inlet has a 5/16-18 right hand female thread; CGA #032.

Machine

ELECTRODE/GAS OUTLET

RECEPTACLE

WORK CABLE & CLAMP

FIGURE A.2 Location of Output Connections

CONNECTIONS FOR TIG (GTAW) WELDING

TIG TORCH CONNECTION

Refer to of this manual for TIG welding equipment which is included with the Square Wave TIG 175 PRO.

A TIG welding torch with cable and connector is supplied with the welder. Turn the Power Switch “OFF”. Connect the torch cable quick connect plug into the

Included Equipment

in the Operation Section

WARNING

CYLINDER could explode if damaged.

•Keep cylinder upright and chained to a support.

•Keep cylinder away from areas where it could be damaged.

•Never allow the torch to touch the cylinder.

•Keep cylinder away from live electrical circuits.

•Maximum inlet pressure 150 psi.

___________________________________________

The optional undercarriage features a pivoting platform that simplifies loading and unloading of gas cylinders. A cylinder is loaded by leaning it slightly sideways and rolling it toward the platform. The cylinder’s weight will push the platform downward against the floor, forming a ramp. At this point, the cylinder may be rolled up the platform into its final position. Secure the cylinder in place with the provided chain. Unload by following these steps in reverse.

SQUARE WAVE TIG 175 PRO

Page 12

REMOTE CONTROL CONNECTION

A remote control receptacle is provided on the case front of the welder for connecting a remote control to to the machine. A Foot Amptrol control, is included with the Square Wave TIG 175 PRO. Refer to the Optional Accessories section of this manual for other available remote controls.

, foot activated remote

INSTALLATION

CONNECTIONS FOR STICK (SMAW) WELDING

STICK ELECTRODE CABLE AND WORK CABLE CONNECTION

Refer to of this manual for STICK welding equipment which is included with the Square Wave TIG 175 PRO.

An electrode holder with cable is supplied with the Square Wave TIG 175 PRO. Turn the Power Switch “OFF”. Connect the cable quick connect plug into the Electrode/Gas Output Receptacle and turn it clockwise until it is tight. The work cable and work clamp are factory connected.

Included Equipment

in the Operation Section

SQUARE WAVE TIG 175 PRO

Page 13

OPERATION

SAFETY PRECAUTIONS

Read and understand this entire section before operating the machine.

WARNING

ELECTRIC SHOCK can kill.

• Do not touch electrically live parts or electrode with skin or wet clothing.

Insulate yourself from work and ground.

•

• Always wear dry insulating gloves.

•

Read and follow “Electric Shock Warnings” in the Safety section if welding must be performed under electrically hazardous conditions such as welding in wet areas or on or in the workpiece.

GENERAL DESCRIPTION

The SQUARE WAVE TIG 175 PROPROis a constant current, single range AC/DC TIG (GTAW) arc welding power source with built-in arc starter / stabilizer. It also has stick welding (SMAW) capability.

The SQUARE WAVE TIG 175 PROPROis recommended for the TIG (GTAW) and stick (SMAW) welding processes within its output capacity of 10 to 175 amps, on both AC and DC polarity.

INCLUDED EQUIPMENT

For GTAW (TIG Welding):

• TIG torch, factory assembled with:

• 12.5 ft (3.8m) one-piece cable

• 3/32” Collet body

• 3/32” Collet

• Short backcap

Not assembled:

• 3/32” x 7” 2% Thoriated Tungsten Electrode

• Long backcap

• 1/2” Diameter Alumina gas cup

FUMES AND GASES can be dangerous.

• Keep your head out of fumes.

• Use ventilation or exhaust to remove fumes from breathing zone.

WELDING SPARKS can cause fire or explosion

• Keep flammable material away.

• Do not weld on containers that have held combustibles.

ARC RAYS can burn.

• Wear eye, ear and body protection.

• Foot Amptrol (4.6m) cable

For SMAW (Stick Welding):

• Electrode holder with cable and quick connect plug

For Installation and startup:

• Work Cable and Clamp

remote current control with 15ft

WELDING CAPABILITY

The SQUARE WAVE TIG 175 PROPROis rated at 150 amps, 15 volts, at 25% duty cycle on a ten minute basis. It is capable of higher duty cycles at lower output currents. It is capable of 175 amps, 27 volts at a lower duty cycle. If the duty cycle is exceeded, a thermal protector will shut off the output until the machine cools.

Observe additional Safety Guidelines detailed in the beginning of this manual.

SQUARE WAVE TIG 175 PRO

Page 14

OPERATION

CONTROLS AND SETTINGS

All operator controls and adjustments are located on the front of the Square Wave TIG 175 PRO. Refer to Figure B.1 and corresponding explanations.

FIGURE B.1 - CONTROL PANEL

1. POWER SWITCH & LIGHT

2. TIG/STICK SWITCH

3. POLARITY SWITCH

4. CURRENT CONTROL

5. OVER TEMPERATURE LIGHT

6. REMOTE CONTROL CONNECTOR

ELECTRODE/ GAS OUTPUT RECEPTACLE

8. WORK CABLE & CLAMP

1. POWER SWITCH & LIGHT - Turns power on or

off to the welder. When switched “ON”, the cooling fan runs and the light will illuminate indicating that the power is on.

2. TIG/STICK SWITCH - Selects the mode of output,

either TIG (GTAW) or Stick (SMAW). Refer to

Welding in TIG Mode

and

Welding in Stick Mode

later in this chapter for information on how the machine functions in each of these modes.

3. POLARITY SWITCH - Allows you to select between

welding in AC , DC - , or DC+ polarity. In DC + polarity the electrode is positive and the work clamp is negative. Use DC + for most stick welding. In DC - the electrode is negative and the work clamp is positive. Use DC - for TIG welding stainless steel and mild steel. AC polarity is recommended for TIG welding aluminum.

CAUTION

Do not switch the polarity switch while welding or damage may result to the machine.

------------------------------------------------------------------------

4. CURRENT CONTROL - This control is active in

both TIG and Stick modes. In Stick mode the current control sets the welding current. In TIG mode this control sets the maximum current. The Amptrol adjust the welding current from the machine minimum to this maximum setting.

5. OVER TEMPERATURE LIGHT - If the welder

overheats due to blocked air flow, high ambient air temperature, or exceeded duty cycle, an internal thermostat will open disabling the welding output and this yellow light will illuminate. The cooling fans will continue to run to cool the unit during this time. The light will go out when the unit cools and the thermostat resets.

will

SQUARE WAVE TIG 175 PRO

Page 15

REMOTE CONTROL CONNECTOR - This connector

provides connection for a remote control. See

Control Operation

7. ELECTRODE/GAS OUTPUT RECEPTACLE - This

quick connect receptacle provides electrical connection to the electrode holder and cable for Stick welding and a combined electrical and gas connection for the TIG torch when TIG welding.

in this section of the manual.

OPERATION

Remote

REMOTE CONTROL OPERATION

A Foot Amptrol™ is included with the SQUARE WAVE TIG 175 PROPROfor remote current control while TIG welding. An optional Hand Amptrol may also be used. An optional Arc Start Switch may be used to start and stop the welding if no remote control of the current is desired. Refer to the Accessories section of this manual.

8. WORK CABLE - This work cable is factory con-

nected to the welder and is connected to the work piece to complete the welding circuit. Refer to

Machine Grounding and High Frequency Interference Protection

of this manual for the proper procedure on grounding the work clamp and work piece to minimize high frequency interference.

in the Installation section

OPERATING STEPS

WELDING IN TIG MODE

1. Connect the TIG torch and cable quick connect plug to the Electrode/Gas output receptacle. This receptacle also contains an integral gas connection for the torch. Connect the work clamp to the work piece.

2. Set the TIG/STICK switch to “TIG”.

3. Set the Polarity Switch to DC- for welding steel or stainless steel; or to AC for welding aluminum.

Connect the Foot Amptrol to the Remote Control Connector.

5. Turn on the cylinder gas valve and adjust the flow regulator to obtain desired flow.

6. Turn the power switch to “ON”. NOTE: There will be a 15 second gas flow when the power is turned on.

7. Set the Current Control on the control panel to the maximum desired amps.

8. Depress the Foot Amptrol to energize the torch and establish an an arc with the work piece.

Both the Hand and Foot Amptrol work in a similar ner.

For simplicity, the following explanation will refer only to “Amptrols”, meaning both Foot and Hand models. The term “minimum” refers to a foot pedal in the “up” position, as it would be with no foot pressure, or a Hand Amptrol in the relaxed position, with no thumb pressure. “Maximum” refers to a fully depressed Foot Amptrol, or a fully extended Hand Amptrol.

When the welder is in TIG mode activating the Amptrol energizes the electrode terminal and varies the output welding current from its minimum value of 10 amps, to the maximum value set by the Current Control on the control panel. This helps eliminate accidental high current damage to the work piece and/or tungsten, and gives a fine control of the current. When the welder is in the stick mode a remote control has no effect and is not used.

It is important to note that, in some cases, the tungsten will not start an arc at the minimum current because the tungsten may be too large or cold. To start an arc reliably, it is important to depress the Amptrol far enough so that the machine output current is near the tungsten operating range. For example, a 3/32” tungsten may be used on DC- to weld the full range. To start the weld, the operator may have to turn the current control up and depress the Amptrol approximately 1/4 of the way down. Depressing the Amptrol to its minimum position may not start the arc. Also if the current control is set too low, the arc may not start. In most cases, a large or cold tungsten will not readily establish an arc at low currents. This is normal. In DC-, the Square Wave 175 will start a 3/32, 2% thoriated tungsten electrode at 15 amperes provided the electrode tip is properly grounded and not contaminated.

BENEFITS OF THE SQUARE WAVE DESIGN

man-

NOTE: When the TIG/STICK switch is set to “TIG”, depressing the remote control will start a 0.5 second gas pre-flow before energizing the TIG torch. When the remote control is released the TIG torch is de-energized and gas flow will continue for a 15 second post flow. When the polarity switch is set to DC, the TIG Arc Starter will turn on and off automatically to start and stabilize the arc. In AC the TIG Arc Starter will turn on with the output and remain on continuously until the remote control is released.

SQUARE WAVE TIG 175 PRO

In AC TIG welding of aluminum, the positive portion of the AC wave provides work piece. This is desirable on materials with a heavy oxide coating such as aluminum. However the positive portion may also cause the electrode to overheat at high currents causing “tungsten spitting”. The negative portion of the AC wave offers no cleaning action but concentrates more heat on the work. The AC waveform of the SQUARE WAVE TIG 175

cleaning

(removal of aluminum oxide) of the

Page 16

OPERATION

PROPROoptimizes cleaning and heating of the work. The result is the capability to weld through the complete range of 12 to 175 amperes in AC TIG or DC- TIG requiring only one electrode, a 3/32” 2% thoriated tungsten.

WELDING IN STICK MODE

1. Put the electrode holder and cable quick connect plug into the electrode output receptacle. Turn clockwise until tight. Connect the work clamp to the work piece.

2. Set the TIG/STICK switch to “STICK”.

3. Set the Polarity Switch for the type of electrode being used (most commonly DC+).

4. Place the electrode in the electrode holder.

5. Turn the power switch to “ON”.

WARNING

In Stick Mode the output terminal and electrode will be electrically hot whenever the power switch is turned on.

6. Adjust the Current Control to the desired amps.

7. Strike an arc and weld.

NOTE: When the TIG/STICK switch is set to “STICK” the output is always on when the power switch is on. A remote control has no effect on the welding current and the gas flow and high frequency TIG arc starter are disabled.

RECOMMENDED ELECTRODE AMPERAGE RANGES - SQUARE WAVE TIG 175 PRO

The SQUARE WAVE TIG 175 PROPROis rated from10 - 175 Amps.

SMAW Process

ELECTRODE POLARITY 3/32" 1/8" 5/32" Fleetweld 5P, Fleetweld 5P+ DC+ 40 - 70 75 - 130 90 - 175 Fleetweld 180 DC+ 40 - 80 55 - 110 105 - 135 Fleetweld 37 DC+ 70 - 95 100 - 135 145 - Max Fleetweld 47 DC- 75 - 95 100 - 145 135 - Max Jet-LH MR DC+ 85 - 110 110 - 160 130 - Max Blue Max Stainless DC+ 40 - 80 75 - 110 95 - 110 Red Baron Stainless DC+ 40 - 70 60 - 100 90 - 140

Mild steel procedures are based on recommended procedures listed in C2.10 8/94 and the maximum rating of the Square Wave TIG 175 PRO Jet-LH MR procedures are based on Jet-LH 78 MR Blue Max procedures are based on C6.1 6/95 Red Baron Procedure are based on ES-503 10/93

GTAW Process

Electrode Polarity DC- AC Approximate Argon

Electrode Tip Prepration Sharpened Balled Gas Flow Rate

Electrode Type

EWTh-1, EWCe-2 EWTh-1, EWTh-2

EWTh-2, EWLa-1 EWP EWCe-2, EWLa-1 Stainless

Electrode Size (in.) EWG EWG Aluminum Steel

.010 Up to 15 A. Up to 10 A. Up to 15 A. 3-8 (2-4) 3-8 (2-4) .020 Up to 15 A. Up to 15 A. Up to 20 A. 5-10 (3-5) 5-10 (3-5) .040 Up to 80 A. Up to 40 A. Up to 60 A. 5-10 (3-5) 5-10 (3-5) 1/16 Up to 150 A. Up to 100 A. Up to 130 A. 5-10 (3-5) 9-13 (4-6) 3/32 Up to MAX. A. Up to 160 A. Up to MAX. A. 13-17 (6-8) 11-15 (5-7)

1/8 X Up to MAX. A. X 15-23 (7-11) 11-15 (5-7)

Tungsten electrodes are classified as follows by the American Welding Society (AWS):

Pure ..................................EWP........green

+1% Thoria .......................EWTh-1...yellow

+2% Thoria .......................EWTh-2...red

+2% Ceria.........................EWCe-2...orange

+1.5% Lanthana ...............EWLa-1 ...black

+0.15 to 0.40% Zirconia ...EWZr .......brown

Ceriated Tungsten is now widely accepted as a substitute for 2% Thoriated Tungsten in AC and DC applications.

EWZr C.F.H. (l/min.)

SQUARE WAVE TIG 175 PRO

MAY96

Page 17

OPTIONAL ACCESSORIES

ACCESSORIES

K964-1 Undercarriage with Pivoting Single Gas Cylinder Platform - This undercarriage features a piv-

oting platform to easily load and unload the gas cylinder without lifting. It was designed specifically for the SQUARE WAVE TIG 175 PROPROpower source, and accommodates 7” to 9 1/4” diameter gas cylinders.The undercarriage comes completely assembled and mounts directly to the power source.

K812 Hand Amptrol

included with the SQUARE WAVE TIG 175 PRO for remote current control while TIG welding. The K812 Hand Amptrol may be used in place of the Foot Amptrol if a thumb operated remote control is desired.

K814 Arc Start Switch - The Arc Start Switch may be used instead of the Foot Amptrol included with the Square Wave TIG 175 PRO. It allows on/off TIG welding at the current set by the Current Control on the control panel. The Arc Start Switch does not provide remote current control.

Magnum® LA-9 and LA-17 TIG Torches - The following standard Magnum® TIG torches with one-piece cable may be used with the Square Wave TIG 175 PRO.

- A Lincoln Foot Amptrol is

TIG Torch Parts Kits - Parts kits are available for the

LA-9 and LA-17 TIG torches. These kits include back cap, collets, collet bodies, nozzles and tungstens.

Order KP507 for LA-9 torches Order KP508 for LA-17 torches

See publication E12.150 for parts kits breakdown.

Cut Length Consumables - TIG welding filler metals are available for welding stainless steel, mild steel, aluminum and copper alloys. See publication C9.10.

K1619-1 TIG Pulser - This TIG Pulser is a “pendant” type providing pulsing capability to the Square Wave TIG 175 Pro. The simple connection between machine and TIG Pulser makes it very easy to install and operate. It provides full range control of Pulse per second, Peak current, Background current, and % Peak on time.

• K859-1 LA-9 12.5 ft medium back cap

• K859-5 LA-9 25 ft medium back cap

• K860-1 LA-17 12.5 ft long back cap

• K860-5 LA-17 25 ft long back cap

NOTE: Each torch requires a quick connector plug (S22529-1) and strain relief boot (M17255) be installed onto the cable. Collets, collet bodies, and nozzles are not included and must be ordered separately.

Quick Connect Plug (S22529-1) and Strain Relief Boot (M17255) - One of each is shipped with the

welder to connect the Magnum LA-9 torch. If you do not care to interchange these parts between torches (one of each is required to connect Magnum LA-9 or LA-17 TIG torches with one-piece cable to the Square Wave TIG 175 PRO) you may order additional sets. The quick connect plug provides connection for both gas and welding current.

Tungstens, Collets, Collet Holders, Gas Cups, Backcaps and Other Torch Parts - A Lincoln Magnum

LA-9 with 12.5 ft. one-piece cable is included with the Square Wave TIG 175 PRO. Standard Magnum® parts and accessories for this torch may be used.

SQUARE WAVE TIG 175 PRO

Page 18

MAINTENANCE

SAFETY PRECAUTIONS

WARNING

ELECTRIC SHOCK can kill.

• Only qualified personnel should perform this maintenance.

• Turn the input power OFF at the disconnect switch or fuse box before working on this equipment.

• Do not touch electrically hot parts.

WARNING

To avoid receiving a high frequency shock, keep the TIG torch and cables in good condition.

ommended. If the contacts are replaced reset the gap spacing to 0.015. Refer to figure C.1. Note in highly dirty environments where there is an abundance of conductive contaminants, use a low pressure air stream to clean the spark gap. Do not disturb the factory setting.

8. Inspect gas hose and inlet fitting for cracks or leaks.

9. Replace any unreadable labels or decals.

10. Verify that the machine and welding circuit is properly grounded.

FIGURE C.1 SPARK GAP

.015 Spark Gap

ROUTINE AND PERIODIC MAINTENANCE

1. Disconnect power supply lines to machine before performing periodic maintenance.

2. Periodically clean the inside of the machine with a low pressure air system. Be sure to clean the following components thoroughly.

• Main Transformer

• Electrode/Gas Output Receptacle

• Polarity Switch

• Rectifier Assembly

• Arc Starter/Spark Gap Assembly

• PC Boards

• Fan Blades

3. Inspect welder output and control cables for fraying, cuts, and bare spots.

4. Keep TIG torch and cables in good condition.

5. Clean air louvers to ensure proper air flow and cooling.

6. The fan motor has sealed ball bearings which require no maintenance.

LEFT SIDE OF MACHINE

FAN MOTOR OR FAN BLADE REPLACEMENT

When installing a new fan blade or fan motor be sure to maintain proper shaft spacing per Figure C.2 below.

7. The arc starter spark gap spacing is factory set at

0.015 inch. It typically will not require periodic maintenance. Refinishing the contacts is not rec-

SQUARE WAVE TIG 175 PRO

.30

Figure C.2

Page 19

TROUBLESHOOTING

HOW TO USE TROUBLESHOOTING GUIDE

WARNING

Service and Repair should only be performed by Lincoln Electric Factory Trained Personnel. Unauthorized repairs performed on this equipment may result in danger to the technician and machine operator and will invalidate your factory warranty. For your safety and to avoid Electrical Shock, please observe all safety notes and precautions detailed throughout this manual.

__________________________________________________________________________

This Troubleshooting Guide is provided to help you locate and repair possible machine malfunctions. Simply follow the three-step procedure listed below.

Step 1. LOCATE PROBLEM (SYMPTOM).

Look under the column labeled “PROBLEM (SYMPTOMS)”. This column describes possible symptoms that the machine may exhibit. Find the listing that best describes the symptom that the machine is exhibiting. Symptoms are grouped into the following categories: output problems, function problems, TIG mode problems, TIG welding problems and Stick welding Problems.

Step 3. RECOMMENDED COURSE OF ACTION

If you have exhausted all of the items in step

2. Contact your Local Lincoln Authorized Field Service Facility.

Step 2. PERFORM EXTERNAL TESTS.

The second column labeled “POSSIBLE AREAS OF MISADJUSTMENT(S)” lists the obvious external possibilities that may contribute to the machine symptom. Perform these tests/checks in the order listed. In general, these tests can be conducted without removing the case wrap-around cover.

CAUTION

DO NOT use a volt-ohm meter to measure output voltages in TIG mode. The High

Frequency Arc Starter voltage can damage the meter.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

SQUARE WAVE TIG 175 PRO

Page 20

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

Machine is Dead No Output - No Fan

Fan runs - No output from machine in either Stick or TIG modes.

POSSIBLE AREAS OF MISADJUSTMENTS(S)

OUTPUT PROBLEMS

1. Make certain that the input power switch is in the “ON” position and machine is plugged in.

2. Check the input voltage at the machine. Input voltage must match the rating plate and voltage connection. Refer to Reconnect Procedure in the Installation section of this manual.

3. Blown or missing fuses in input line.

1. Check for proper input voltages per nameplate and voltage reconnection.

2. Check to make sure polarity switch is not in between two positions.

RECOMMENDED

COURSE OF ACTION

Contact your Local Lincoln Authorized Field Service Facility for technical

troubleshooting assistance.

Fan runs - No output from machine in either Stick or TIG modes and the yellow light on the control panel is on.

Machine does not respond (no gas flow, no high frequency and no open circuit voltage) when arc start switch or Amptrol is activated - fan is working.

1. Welding application may have exceed the recommended duty cycle. Allow the unit to run until the fan cools the unit and the yellow light goes out.

1. Machine MUST be in the TIG Mode.

2. The Amptrol may be defective. Check for continuity between pins “D” and “E” on cable connector when Amptrol is depressed.

CAUTION

SQUARE WAVE TIG 175 PRO

Page 21

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

Machine regularly over heats - thermostat opens, Yellow light on front panel glows. The fan runs but machine has no output.

POSSIBLE AREAS OF MISADJUSTMENTS(S)

OUTPUT PROBLEMS

1. Welding application may exceed recommended duty cycle. Reduce the duty cycle.

2. Dirt and dust may have clogged the cooling channels inside the machine. Blow out unit with clean, dry low pressure air.

3. Air intake and exhaust louvers may be blocked due to inadequate clearance around machine.

RECOMMENDED

COURSE OF ACTION

Contact your Local Lincoln Authorized Field Service Facility for technical

troubleshooting assistance.

CAUTION

SQUARE WAVE TIG 175 PRO

Page 22

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

Machine output is intermittently lost. Gas flow and high frequency are also interrupted.

Arc “Flutters” when TIG welding.

POSSIBLE AREAS OF MISADJUSTMENTS(S)

TIG MODE PROBLEMS

1. Problem may be caused by high frequency interference. Make sure that the machine is grounded properly according to the installation instructions. If there are other high frequency sources in the area, make certain that they are grounded properly.

2. Check Amptrol for proper operation and loose connections.

3. Check for proper input voltage and proper voltage reconnection.

1. Tungsten electrode may be too large in diameter for the current setting.

RECOMMENDED

COURSE OF ACTION

Arc “Pulsates” when AC TIG

welding.

2. Tungsten not “sharp” when welding in DC - mode.

3. Gas shielding may be insufficient. Increase gas flow; reduce tungsten stickout beyond gas cup.

4. Check for contaminated gas or leaks in the gas line, torch, or connections

5. If a helium blend is used as a shielding gas, then reduce the percentage of helium.

Micro Switch mounted on Polarity Switch is not opening in “AC” mode.

Contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance.

CAUTION

SQUARE WAVE TIG 175 PRO

APR96

Page 23

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

Black areas along weld bead.

Weak high frequency - machine has normal welding output.

POSSIBLE AREAS OF MISADJUSTMENTS(S)

TIG WELDING PROBLEMS

1. Clean any oily or organic contamination from the work piece.

2. Tungsten electrode may be contaminated. Replace or sharpen.

3. Check for contaminated gas or leaks in the gas line, torch, or connections

4. Gas shielding may be insufficient. Increase gas flow; reduce tungsten stickout beyond gas cup.

1. Check for poor connections in the welding circuit.

2. Gas shielding may be insufficient. Increase gas flow; reduce tungsten stickout beyond gas cup.

RECOMMENDED

COURSE OF ACTION

High frequency “spark” is present at tungsten electrode, but operator is unable to establish a welding arc. Machine has normal open circuit voltage (refer to

Specifications

Chapter).

Technical

in the Installation

3. Check for work and electrode cables in poor condition allowing high frequency to “Leak Off”.

Keep cables as short as possible

5. Check Spark Gap operation and setting (0.015”)

1. The tungsten electrode may be contaminated. Replace or sharpen.

2. The current control may be set too low.

3. The tungsten electrode may be too large for the process.

If a helium blend is used as a shielding gas, then reduce the percentage of helium.

Contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance.

CAUTION

SQUARE WAVE TIG 175 PRO

Page 24

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

No high frequency. Machine is in the TIG Mode and has normal output.

No gas flow when Amptrol is activated in the TIG Mode. Machine has output - fan runs. A “Click” can heard indicating that the gas solenoid valve is operating.

POSSIBLE AREAS OF MISADJUSTMENTS(S)

TIG WELDING PROBLEMS

1. If the machine location is in a highly dirty environment with conductive contaminants, check and clean the spark gap with a low pressure air stream per the maintenance instructions.

1. Gas supply is empty or not turned on.

2. Flow regulator may be set too low.

3. Gas hose may be pinched.

4. Gas flow may be blocked with dirt. Check filter screen inside gas inlet fitting to solenoid valve. Use filters to prevent reoccurrence.

5. Consult your local welder/gas distributor.

RECOMMENDED

COURSE OF ACTION

Contact your Local Lincoln Authorized Field Service Facility for technical

troubleshooting assistance.

When AC TIG welding, the arc is erratic and there is a loss of “cleaning” of the work piece.

The end of the tungsten electrode melts away.

1. Tungsten electrode may be too small for process. Use a larger diameter tungsten or a pure tungsten.

If a helium blend is used as a shielding gas, then reduce the percentage of helium.

1. The welding current is too high for the electrode type and/or size. See the Table B.1 in the Operation Section of this manual.

CAUTION

SQUARE WAVE TIG 175 PRO

Page 25

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

Stick electrode “Blasts Off” when arc is struck.

Stick electrode “sticks” in the weld puddle.

POSSIBLE AREAS OF MISADJUSTMENTS(S)

STICK WELDING PROBLEMS

1. Weld current may be set too high for electrode size. Reduce current control setting, or use a larger diameter electrode.

1. The weld current may be set too low. Increase the current control setting or use a smaller diameter electrode.

RECOMMENDED

COURSE OF ACTION

Contact your Local Lincoln Authorized Field Service Facility for technical

troubleshooting assistance.

CAUTION

SQUARE WAVE TIG 175 PRO

Page 26

NOTES

SQUARE WAVE TIG 175 PRO

Page 27

H4 (415V)

H3 (380V)

H2 (240V)

SSF

W X3

R 209

18VAC

B X4

U 210

W X5

W 201

W 221

78VAC

18VAC

R 222

W X6

W 204

(-)

B X7

B 230

115VAC

220

FAN

115VAC

B X8

B 232

SCR1

WIRING DIAGRAM

CLOSED

OPEN

CLOSED

L10538-1

CRM30796

S2A

FRONT GANG

POS

SHOWN IN AC POSITION)

(REAR VIEW,

SWITCH

POLARITY

BYPASS/

PC BOARD

STABILIZER

A-C, D-E, B-F

B-D, C-E, A-F, G-H

B-D, A-E, C-F, G-H

POLARITY SWITCH MICRO SWITCH

DC-

DC+

ELECTRICAL SYMBOLS PER E1537.

(+)

SCR2

217

218

SCR3

216

(-)

SCR4

SPARK

GAP

ARC STARTER AS’BLY

115VAC

CURRENT CONTROL

233

276

277

H4H2

TOROID

PL1

POWER "ON" LIGHT

231

275

STICK

243

MODE SWITCH

TIG - OPEN )

( STICK - CLOSED

TIG

244

TL1

THERMAL LIGHT

R 241

B 242

236A

237

236B

AT MINIMUM

10K A-B

AMPTROL

REMOTE

RECEPTACLE

REMOTE

244

277

243

275B233

241

276

231

242

311

312

DFE

236A

{

313

314

W 221 (+)

VOLTAGE RECONNECTION

CONNECT COPPER LINK FROM POWER

SWITCH STUD TO H4. TIGHTEN NUTS.

WIRING DIAGRAM - SQUARE WAVE TIG 175 PRO (240/380/415/1/50/60)

415 VOLT CONNECTION (AS SHOWN)

CONNECT COPPER LINK FROM POWER

SWITCH STUD TO H2. TIGHTEN NUTS.

SWITCH STUD TO H3. TIGHTEN NUTS.

380 VOLT CONNECTION

CONNECTED ACROSS POWER SWITCH.

C1 AND C2 MUST ALWAYS BE

240 VOLT CONNECTION

R 222 (-)

217 G1 218 G2 G3 220 216 G4

236

238

209

R U

210 230

232

B 238 234 235

204

201 236

SV1

234

235

SQUARE WAVE TIG 175 PRO

Page 28

NOTES

SQUARE WAVE TIG 175 PRO

Page 29

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Page 30

WARNING

Spanish

AVISO DE

PRECAUCION

● Do not touch electrically live parts or

electrode with skin or wet clothing.

● Insulate yourself from work and

ground.

● No toque las partes o los electrodos

bajo carga con la piel o ropa mojada.

● Aislese del trabajo y de la tierra.

● Keep flammable materials away.

● Mantenga el material combustible

fuera del área de trabajo.

● Wear eye, ear and body protection.

● Protéjase los ojos, los oídos y el

cuerpo.

French

ATTENTION

German

WARNUNG

Portuguese

ATENÇÃO

Japanese

Chinese

Korean

Arabic

● Ne laissez ni la peau ni des vête-

ments mouillés entrer en contact avec des pièces sous tension.

● Isolez-vous du travail et de la terre.

● Berühren Sie keine stromführenden

Teile oder Elektroden mit Ihrem Körper oder feuchter Kleidung!

● Isolieren Sie sich von den

Elektroden und dem Erdboden!

● Não toque partes elétricas e elec-

trodos com a pele ou roupa molhada.

● Isole-se da peça e terra.

● Gardez à l’écart de tout matériel

inflammable.

● Entfernen Sie brennbarres Material!

● Mantenha inflamáveis bem guarda-

dos.

● Protégez vos yeux, vos oreilles et

votre corps.

● Tragen Sie Augen-, Ohren- und Kör-

perschutz!

● Use proteção para a vista, ouvido e

corpo.

READ AND UNDERSTAND THE MANUFACTURER’S INSTRUCTION FOR THIS EQUIPMENT AND THE CONSUMABLES TO BE USED AND FOLLOW YOUR EMPLOYER’S SAFETY PRACTICES.

SE RECOMIENDA LEER Y ENTENDER LAS INSTRUCCIONES DEL FABRICANTE PARA EL USO DE ESTE EQUIPO Y LOS CONSUMIBLES QUE VA A UTILIZAR, SIGA LAS MEDIDAS DE SEGURIDAD DE SU SUPERVISOR.

LISEZ ET COMPRENEZ LES INSTRUCTIONS DU FABRICANT EN CE QUI REGARDE CET EQUIPMENT ET LES PRODUITS A ETRE EMPLOYES ET SUIVEZ LES PROCEDURES DE SECURITE DE VOTRE EMPLOYEUR.

LESEN SIE UND BEFOLGEN SIE DIE BETRIEBSANLEITUNG DER ANLAGE UND DEN ELEKTRODENEINSATZ DES HERSTELLERS. DIE UNFALLVERHÜTUNGSVORSCHRIFTEN DES ARBEITGEBERS SIND EBENFALLS ZU BEACHTEN.

Page 31

● Keep your head out of fumes.

● Use ventilation or exhaust to

remove fumes from breathing zone.

● Turn power off before servicing.

● Do not operate with panel open or

guards off.

WARNING

● Los humos fuera de la zona de res-

piración.

● Mantenga la cabeza fuera de los

humos. Utilice ventilación o aspiración para gases.

● Gardez la tête à l’écart des fumées.

● Utilisez un ventilateur ou un aspira-

teur pour ôter les fumées des zones de travail.

● Vermeiden Sie das Einatmen von

Schweibrauch!

● Sorgen Sie für gute Be- und

Entlüftung des Arbeitsplatzes!

● Mantenha seu rosto da fumaça.

● Use ventilação e exhaustão para

remover fumo da zona respiratória.

● Desconectar el cable de ali-

mentación de poder de la máquina antes de iniciar cualquier servicio.

● Débranchez le courant avant l’entre-

tien.

● Strom vor Wartungsarbeiten

abschalten! (Netzstrom völlig öffnen; Maschine anhalten!)

● Não opere com as tampas removidas.

● Desligue a corrente antes de fazer

serviço.

● Não toque as partes elétricas nuas.

● No operar con panel abierto o

guardas quitadas.

● N’opérez pas avec les panneaux

ouverts ou avec les dispositifs de protection enlevés.

● Anlage nie ohne Schutzgehäuse

oder Innenschutzverkleidung in Betrieb setzen!

● Mantenha-se afastado das partes

moventes.

● Não opere com os paineis abertos

ou guardas removidas.

Spanish

AVISO DE

PRECAUCION

French

ATTENTION

German

WARNUNG

Portuguese

ATENÇÃO

Japanese

Chinese

Korean

Arabic

LEIA E COMPREENDA AS INSTRUÇÕES DO FABRICANTE PARA ESTE EQUIPAMENTO E AS PARTES DE USO, E SIGA AS PRÁTICAS DE SEGURANÇA DO EMPREGADOR.

Page 32

• World's Leader in Welding and Cutting Products •

• Sales and Service through Subsidiaries and Distributors Worldwide •

Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

Lincoln Electric SQUARE WAVE TIG 175 PRO User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual