Hobart 350LX - Manual

OM-356 Page 2 Arc rays from the welding process produce intensevisible and invisible (ultraviolet and infrared) raysthat can burn eyes and skin. Sparks fly off from theweld. ARC RAYS can burn eyes and skin. D Wear a welding helmet fitted with a proper shade of filter to protectyour face and eyes whe...

OM-356 Page 3 1-3. Additional Symbols For Installation, Operation, And Maintenance FIRE OR EXPLOSION hazard. D Do not install or place unit on, over, or nearcombustible surfaces. D Do not install unit near flammables. D Do not overload building wiring – be sure power supply system isproperly sized, ...

OM-356 Page 4 1-5. EMF Information Considerations About Welding And The Effects Of Low FrequencyElectric And Magnetic FieldsWelding current, as it flows through welding cables, will cause electro-magnetic fields. There has been and still is some concern about suchfields. However, after examining mor...

OM-356 Page 5 SECTION 1 – CONSIGNES DE SECURITE – LIRE AVANT UTILISATION som _nd_fre 4/98 1-1. Signification des symboles Signifie Mise en garde ! Soyez vigilant ! Cette procédureprésente des risques de danger ! Ceux-ci sont identifiéspar des symboles adjacents aux directives. Y Identifie un message...

OM-356 Page 6 Le rayonnement de l’arc du procédé de soudagegénère des rayons visibles et invisibles intenses(ultraviolets et infrarouges) susceptibles de provoquer des brûlures dans les yeux et sur la peau. Des étincelles sont projetées pendant le soudage. LES RAYONS DE L’ARC peuvent pro-voquer des ...

OM-356 Page 9 SECTION 2 – DEFINITIONS 2-1. Warning Label Definitions S-176 254-A 1 1.1 1.2 1.3 3 3.1 3.2 3.3 4 4.1 + 2 2.1 2.2 + + 5 6 + 2.3 Warning! Watch Out! There arepossible hazards as shown by thesymbols. 1 Electric shock from weldingelectrode or wiring can kill. 1.1 Wear dry insulating gloves...

OM-356 Page 10 2-2. Manufacturer ’s Rating Label For CE Products

OM-356 Page 11 2-3. Symbols And Definitions Some symbols are found only on CE products. NOTE A Amperes Panel–Local Gas Tungsten Arc Welding (GTAW) Shielded Metal Arc Welding (SMAW) V Volts Do Not Switch While Welding Arc Force (DIG) Spot Timer Output Circuit Breaker Remote Temperature Protective Ear...

OM-356 Page 12 SECTION 3 – INSTALLATION OR Location And Airflow Y Falling Unit Can CauseInjury. S Use lifting eye to lift unit only,NOT running gear, gascylinders, or any otheraccessories. S Use equipment of adequatecapacity to lift and supportunit. S If using lift forks to move unit,be sure forks a...

OM-356 Page 14 6 Minutes Welding 4 Minutes Resting 4 Minutes Welding 6 Minutes Resting 3-4. Duty Cycle And Overheating Duty Cycle is the percentage of 10minutes that the unit can weld atrated load without overheating. If unit overheats, output stops, frontpanel voltmeter/ammeter displaysa HLP3 or HL...

OM-356 Page 15 3-6. Weld Output Terminals And Selecting Cable Sizes Y ARC WELDING can cause Electromagnetic Interference. To reduce possible interference, keep weld cables as short as possible, close together, and down low, such as on the floor.Locate welding operation 100 meters from any sensitive ...

OM-356 Page 16 3-8. Shielding Gas Connections And 115 Volts AC Duplex Receptacle Ref. ST-801 972 / Ref. ST-801 973 / Ref. ST-157 858 Y Turn Off power before con-necting to receptacle. 1 Gas Valve In Fitting Located on rear of unit. 2 Gas Valve Out Fitting Fittings have 5/8-18 right-handthreads. 3 Cy...

OM-356 Page 17 3-9. Electrical Service Guide All values calculated at 60% duty cycle. NOTE 50/60 Hertz Models Without Power Factor Correction Input Voltage 200 220 230 400 440 460 520 575 Input Amperes At Rated Output 129 117 112 65 58 56 49 45 Max Recommended Standard Fuse OrCircuit Breaker Rating ...

OM-356 Page 18 1 3-10. Placing Jumper Links And Connecting Input Power Ref. ST-801 973-A Check input voltage available atsite. 1 Jumper Link Label Check label – only one is on unit. 2 Jumper Links Move jumper links to match inputvoltage. 3 Input And GroundingConductors Select size and length using S...

OM-356 Page 19 SECTION 4 – OPERATION 4-1. Controls A. For 200/230/460 Volts And Non CE Units Ref. ST-183 200-A / Ref. ST-183 260-A / Ref. ST-801 972 18 . Top row of lights in upper left corner areOn for SMAW. Bottom row are On forGTAW. 1 Process Control See Section 4-3. 2 Current Control See Section...

OM-356 Page 21 4-2. Output Selector Switch Ref. ST-191 372 1 Output Selector Switch Y Do not use AC output indamp areas, if movement isconfined, or if there is dan-ger of falling. Use AC outputONLY if required for thewelding process, and thenuse a remote control. Y Do not change position ofswitch wh...

OM-356 Page 22 4-4. Current Control 1 Current Control Use control to select front panel orremote current control. For front panel current control,press button to toggle LED to Panelposition. For remote current control, pressbutton to toggle LED to Remote 14position (see Section 3-7). NOTE: Lit LED i...

OM-356 Page 23 4-6. Start Mode 1 Start Mode For SMAW welding, press button to toggleLED to Off position. For GTAW welding, use control to select Offfor no HF, Lift-Arc t , HF for arc starting only, or continuous HF. See Section 4-13 for ad-justing high frequency intensity. Application: When Off is s...

OM-356 Page 24 4-7. Meters 1 Voltmeter Voltmeter displays average voltage(to the nearest 0.1 V) at the weldoutput terminals. 2 Ammeter Use meter to preset amperage. Me-ter displays average weld amper-age output of unit to nearest am-pere when welding. 1 2 4-8. Amperage Adjustment Control 1 Amperage ...

OM-356 Page 30 4-17. Crater Time Control And Final Current Control 1 Sequence Selection Switch Place switch in Crater position. 2 Crater Time Control Use control to reduce currentover a set period of time (0–15seconds) at the end of the weldcycle when NOT using a remotecurrent control. 3 Final Curre...

OM-356 Page 34 SECTION 5 – MAINTENANCE & TROUBLESHOOTING 5-1. Routine Maintenance Y Disconnect power before maintaining. 3 Months Replace Unreadable Labels Clean And Tighten Weld Terminals Repair Or Replace Cracked Weld Cables Adjust Spark Gaps Replace Cracked Parts 14-Pin Cord Gas Hose Torch Ca...

OM-356 Page 35 5-3. Adjusting Spark Gaps Ref. ST-801 972-A Y Turn Off power beforeadjusting spark gaps. Open access door. 1 Tungsten End Of Point Replace point if tungsten end dis-appears; do not clean or dresstungsten. 2 Spark Gap Normal spark gap is 0.012 in (0.305mm). If adjustment is needed, pro...

OM-356 Page 36 5-4. Voltmeter/Ammeter Help Displays . All directions are in reference to the frontof the unit. All circuitry referred to is lo-cated inside the unit. 0 Help 0 Display Indicates a short in the thermal protection cir-cuitry located on the transformer of the unit.If this display is show...

OM-356 Page 37 5-5. Troubleshooting NOTE: The remedies listed below are recommendations only. If these remedies do not fixthe trouble with your unit, have a Factory Authorized Service Agent check unit.There are not user serviceable parts inside unit. Refer to Section 5-4 for any Help (HLP) message d...

OM-356 Page 39 SECTION 6 – ELECTRICAL DIAGRAM SC-187 950-C Figure 6-1. Circuit Diagram

OM-356 Page 40 SECTION 7 – HIGH FREQUENCY 7-1. Welding Processes Requiring High Frequency high_freq 12/96 – S-0693 1 High-Frequency Voltage TIG – helps arc jump air gapbetween torch and workpiece and/or stabilize the arc. 1 TIG Work 7-2. Incorrect Installation 50 ft (15 m) S-0694 Sources of Direct H...

OM-356 Page 41 7-3. Correct Installation 1 High-Frequency Source (weldingpower source with built-in HF orseparate HF unit) Ground metal machine case, work outputterminal, line disconnect device, inputsupply, and worktable.2 Center Point of Welding Zone Midpoint between high-frequency sourceand weldi...

OM-356 Page 42 SECTION 8 – PARTS LIST ST-802 012-F . Hardware is common andnot available unless listed. Figure 8-1. Main Assembly

Warranty Questions? Call1-877-HOBART1for your localHobart distributor. hobart standard 7/00 ServiceYou always get the fast,reliable response youneed. Most replacementparts can be in yourhands in 24 hours. SupportNeed fast answers to thetough welding questions?Contact your distributor orcall 1-800-33...

PRINTED IN USA  2000 Hobart Welding Products. 1/00 Hobart Welding Products An Illinois Tool Works Company600 West Main StreetTroy, OH 45373 USA For Technical Assistance:Call1-800-332-3281For Literature Or Nearest Dealer:Call 1-877-Hobart1 Model Name Serial/Style Number Purchase Date (Date which equ...