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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

welding arc or when the engine is running.
Stop the engine and allow it to cool before
refueling to prevent spilled fuel from vaporiz-
ing 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.

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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.

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SAFETY

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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 can-
cer, 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

Summary of Contents for INVERTEC STT II Series

Page 1: ...TALL OPERATE OR REPAIR THIS EQUIPMENT WITHOUT READ ING THIS MANUAL AND THE SAFETY PRECAUTIONS CON TAINED THROUGHOUT And most importantly think before you act and be careful For use with machines havin...

Page 2: ...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...

Page 3: ...cal 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 coo...

Page 4: ...vent 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...

Page 5: ...iv SAFETY iv...

Page 6: ...ne 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 mad...

Page 7: ...ting Controls B 2 Design Features and Advantages B 2 Welding Capability B 2 Limitations B 2 Operational Features and Controls B 3 Welding Operation B 4 Welding Parameters and Guidelines B 5 Welding Pr...

Page 8: ...6 mm2 10 6 mm2 460 60 30 16 10 6 mm2 10 6 mm2 200 50 60 40 33 10 6 mm2 10 6 mm2 220 50 60 40 30 10 6 mm2 10 6 mm2 380 50 60 30 18 10 6 mm2 10 6 mm2 415 50 60 30 17 10 6 mm2 10 6 mm2 440 50 60 30 16 10...

Page 9: ...rical codes SUPPLY CONNECTIONS Be sure the voltage phase and frequency of the input supply is as specified on the rating plate Input Power supply line entry in provided on the case back of the machine...

Page 10: ...try access hole at the right rear of the machine 3 Route the cable through the cable hangers located along the lower right inside edge of the machine up to the power switch located on the front panel...

Page 11: ...C 1 Open reconnect panel access door on wrap around 2 Move input voltage switch to Voltage 380 460V pos ition 3 Move lead A to 440 460 Terminal 380 or 415 VAC 1 Open reconnect panel access door on wra...

Page 12: ...ut 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...

Page 13: ...Digital meters for procedure settings are standard Automatic Inductance or Pinch Control Solid state circuitry for extra long component life Current feedback ensures that original procedure settings...

Page 14: ...EAK CURRENT DISPLAY METER This is a digital meter for displaying the preset Peak Current This meter displays in 1 amp increments This meter does not indicate actual welding current only the preset cur...

Page 15: ...r connection instructions 11 ARC SENSE RECEPTACLE This is a four pin MS type connector for WORK and ELECTRODE sense leads The STT requires a WORK sense and ELECTRODE sense lead for proper operation Th...

Page 16: ...el should be set greater than in a cor responding application using a gas blend with a high percentage of Argon Longer initial arc lengths with 100 CO2 are required to reduce spatter BACKGROUND CURREN...

Page 17: ...lectrode size mm 0 035 0 045 0 045 0 9 1 1 1 1 WFS min m min 100 100 120 2 5 2 5 3 0 Peak Current 225 270 310 Background Current 40 65 70 Tailout setting 8 4 6 Average Amperage 70 110 130 Travel Speed...

Page 18: ...NSE LEADS These leads are used to accu rately sense arc voltage One set is required for each STT II power source A 10 ft and 25 ft set are provid ed as standard with the machine Additional sets are av...

Page 19: ...re feeder control cable between the LN 742 or STT 10 and the 14 pin Wire Feeder Receptacle on the STT II For the STT 10 Wire Feeder Connect the second wire feeder control cable between the STT 10 and...

Page 20: ...LDING ARC WORK LEAD WIRE FEEDER WIRE FEEDER CONTACT ELECTRODE SENSE LEAD IS BOLTED TOGETHER WITH ELECTRODE LEAD ON THE BLOCK STT 10 WIRE FEEDER WARNING Turn off input power to the Welding Power source...

Page 21: ...with machine NEVER USE A SHORTING STRAP FOR THIS PROCE DURE 5 Locate the two capacitor terminals large hex head cap screws shown in Figure D 1 6 Use safety glasses electrically insulated gloves and in...

Page 22: ...d circuit boards Power Switch Main Transformer Input Rectifier Heat Sink Fins Input Filter Capacitors Output Terminals Lower base compartment 4 Examine capacitors for leakage or ooz ing Replace if nee...

Page 23: ...BLE CAUSE lists the obvious external possibilities that may contribute to the machine symptom Step 3 RECOMMENDED COURSE OF ACTION This column provides a course of action for the Possible Cause general...

Page 24: ...ntrol cable between the feeder and the STT II II unit Make sure the 2 and 4 leads are intact 2 Put a jumper wire between Pins C and D on the 14 pin MS connector If normal open circuit voltage 85VDC is...

Page 25: ...es open again con tact your local Lincoln Authorized Field Service Facility 1 The over current sensor is being activated indicating that too much output current is being drawn from the machine Reduce...

Page 26: ...input voltages fuses and input voltage reconnect proce dures See Installation section 2 If high input voltage 380VAC or higher is applied the capacitors may need conditioning Let the unloaded machine...

Page 27: ...put power is low POSSIBLE AREAS OF MISADJUSTMENT S 1 Check the Arc Sense leads for loose or faulty connections 2 Make sure the Arc Sense WORK lead is as close as pos sible to the welding arc 3 Make su...

Page 28: ...utside air currents 2 Check gun and nozzle for leaks or obstructions 3 Make certain machine and wire feed settings are correct for process 1 One or more of the machine set tings may be wrong Check the...

Page 29: ...NOT SHOW THE EXACT CONNECTION SHOWN IS FOR 440 460V OPERATION N D PLACE A LEAD ON APPROPRIATE CONNECTION FOR INPUT VOLTAGE N E D1 THRU D5 OUTPUT DIODES ARE A MATCHED SET D7 THRU D11 OUTPUT DIODES ARE...

Page 30: ...F 2 DIAGRAMS F 2 INVERTEC STT II 13 19 20 75 23 25 13 21 24 50 1 9 98B M18706 DIMENSION PRINT STT II...

Page 31: ...6 383 2259 and ask for the Welding School Registrar Lincoln Welding School BASIC COURSE 700 00 5 weeks of fundamentals There is a 10 discount on all orders of 50 00 or more for shipment at one time to...

Page 32: ...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 moja da Aislese del trabajo y...

Page 33: ...e Be und Entl ftung des Arbeitsplatzes Mantenha seu rosto da fuma a Use ventila o e exhaust o para remover fumo da zona respirat ria Turn power off before servicing Desconectar el cable de ali mentaci...

Page 34: ...part that is required due to normal wear CONDITIONS OF WARRANTY TO OBTAIN WARRANTY COVERAGE The purchaser must contact Lincoln or Lincoln s Authorized Service Facility about any defect claimed under L...

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