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Lincoln Electric PRECISION TIG 375 User's Manual

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2. t 122 M o F 2 DIMENSION PRINT F 3 F 3 66211 5 9 1 PRECISION TIG 375 LINCOLN ELECTRIC DIMENSION PRINT F 4 F 4 099117 5 ONILNNOW 3SV8 8 JO NOILYDOT HALSIOHHDHOL t HDYOL LUC c 2292M OILSAINOT L 2292M PRECISION TIG 375 LINCOLN E Spanish AVISO DE PRECAUCION French ATTENTION German WARNUNG ATENCAO Japanese EE SIR Korean Do not touch electrically live parts or electrode with skin or wet clothing Insulate yourself from wor
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5. 66 ONE LWISOWREHL LL una OIHMONN3S OLVISONIIL AMISOMBHL 5 LL 1V1SOWWHI AMVONODES LL 153 NODVAM3Q NOQVONVHNV 1 318W3SN3 W31NV1S 390912319 J008 ON 1 VdSIHO vuniu38v unaiviog NOINOHD3TI vary L 9 1VISOWIBHL tal gt sn31VSrII8V1S NOLLVAIS3q D 984 09 2d H3ZII8V1S SSVdA8 ziz o ve 3gWIN3 3DNVSSInd Wn314 nii INI uns Q3 L4 LI ONDIW VOVMIN3 VJ9W3N3 HO LEE 3gNINAC 3DNVSSIDd 00 8 3 151538 00 8 TONVASISHE TOWINOD 7 OF C _ SUE 31081402 05 5 S3NOISIS3U C 108 OS S 3DNVISISQU seu veu 62 52 3H01SIS3H 62 52 IDNVISISIY lt 292 572 05 O IN3IWINSISOS 301953 522 05 32919153 0017002 OISWVO WOLSIS3N 10017002 3SVHd LNIW3ONVHD 3ONVISISJW IVOIONOL S3OQVZHIBVIS3 503115 S3HOLDNONI 1
6. 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 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 A 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 TABLE OF CONTENTS Page Installation emm Section A Technical SPECHICALIONS uuu L u E A 1 A 2 Sa
7. Use protec o para a vista ouvido e corpo HRUSHICRBRELTE amp UV ei 712 Zo 5 SOHAL die gle Lily asa y Gl sil 4 READ AND UNDERSTAND THE MANUFACTURER S INSTRUCTION FOR THIS EQUIPMENT AND THE CONSUMABLES 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 HER STELLERS DIE UNFALLVERHUTUNGSVORSCHRIFTEN DES ARBEITGEBERS SIND EBENFALLS ZU BEACHTEN Keep your head out of fumes Use ventilation or exhaust to remove fumes from breathing zone Los humos fuera de la zona de res piraci n e Mantenga la cabeza fuera de los humos Utilice ventilaci n o aspiraci n para gases e Gardez la t te l cart des fum es Utilisez un ventilateur ou un aspira teur pour ter les fum es des zones de travail e Vermeiden Sie das Einatmen von Schweibrauch Sorgen Sie fiir gute Be und Entl ftung des Arbeitsplatzes e Mantenha seu rosto da fumaca Use ventilac o e exhaust o para remover fumo da zon
8. AUG 06 material to protect your skin and that of your helpers from the arc rays 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 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 9 The operation of welding fume control equipment is affected by various factors including proper use and positioning of the equipment maintenance of the equipment and the specific welding procedure and application involved Worker expo sure level should be checked upon installation and periodi cally thereafter to be certain it is within applicable OSHA PEL and ACGIH TLV limits
9. for more than 1 second to activate the restart function When the trigger is released up slope will occur 4 STEP RESTART DISABLED With DIP Switch 3 OFF As Shipped Or actuate and hold the trigger during down slope to immediately end down slope and maintain crater current Hold the trigger for more than 1 second to active the restart function When the trigger is released will occur Hold the second trigger pull for more than 1 second to maintain crater current before stopping Actuate the trigger holding itless Actuate the trigger third Or aciuate the trigger third than 1 second to begin normal time during down slope to time during down slope to The following two immediately end down slope immediately end down slope down slope options are avialable during the and stop Hold the third trigger pull to normal down slope period maintain crater current PRECISION TIG 375 LINCOLN B 11 OPERATION B 11 TIG WELD CYCLE CHART 2 or 4 STEP 4 STEP With PULSE ON 4 STEP Trigger 4 STEP Trigger Trigger Trigger No Pulsing Re closed or Re opened Closed 157 Open During Upslope Time 2 STEP Trigger after SEE ITEM 12 SEE ITEM 12 or Opened Downslope Time When Downslope SEE ITEM 12 SEE ITEM 12 HOT START Drops Below Background Settin MAXIMUM OUTPUT 3 SETTING SEE ITEM 7a CRATER FILL Adjustable 2 Max A LEVEL SEE ITEM 6 Advanced Panel DIP sw Sel
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11. 11 REMOTE RECEPTACLE 12 TRIGGER SWITCH 13 PULSE SPOT MODE SWITCH 14 PULSE FREQUENCY CONTROL 15 PULSE ON TIME CONTROL 16 PULSE BACKGROUND CURRENT CONTROL 17 DOWNSLOPE TIME 18 INTERNAL SETUP SELECTIONS NOT SHOWN INSIDE PANEL 19 HIGH FREQUENCY INTENSITY CONTROL NOT SHOWN LOCATION ONLY ON SIDE OF MACHINE 1 POWER SWITCH Input line switch turns input power ON or OFF as indicated by the on or off sta tus of the front panel displays 2 POLARITY SWITCH The 3 position rotary power switch has detente positions for DC AC and DC selections for the Electrode output welding polarity 3 MODE SWITCH The mode switch allows vertical ly positioned selection of the two machine welding modes The selected mode is indicated by a lit col ored panel light which permits viewing the machine setting from a distance 3 a STICK mode Top position Red panel light WARNING EM e ELECTRIC SHOCK can kill When the Power Source is ON in STICK mode the Electrode circuits of both the Stick and TIG torch cables The CC Stick mode may be used for general pur pose stick welding SMAW within the capacity of the machine The capacity is too limited for arc air carbon AAC gouging eIn this mode the output terminals are activated electrically HOT gas flow is not activated and HOT START and ARC FORCE levels are fixed or Advanced Panel selectable See Section B 7 with no front panel adjustm
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13. ELECTRICALLY powered equipment 8 a Turn off input power using the disconnect Switch at the fuse box before working on the equipment Install equipment in accordance with the U S National Electrical Code all local codes and the manufacturer s recommendations Ground the equipment in accordance with the U S National Electrical Code and the manufacturer s recommendations iv SAFETY iv PR CAUTIONS DE S RET Pour votre propre protection lire et observer toutes les instructions et les pr cautions de s ret specifiques qui parraissent dans ce manuel aussi bien que les pr cautions de s ret g n rales suiv antes S ret Pour Soudage A L Arc 1 Protegez vous contre la secousse lectrique a Les circuits l lectrode et la pi ce sont sous tension quand la machine souder est en marche Eviter toujours tout contact entre les parties sous tension et la peau nue ou les v tements mouill s Porter des gants secs et sans trous pour isoler les mains Faire tr s attention de bien s isoler de la masse quand on soude dans des endroits humides ou sur un plancher met allique ou des grilles metalliques principalement dans les positions assis ou couch pour lesquelles une grande partie du corps peut tre en contact avec la masse Maintenir le porte lectrode la pince de masse le c ble de soudage et la machine souder en bon et s r tat defonc tionnement d Ne jamais plonger le porte lect
14. SWITCH This 2 position switch selects how the arc start switch connected to the above Remote receptacle functions in 2 Step or 4 Step mode CAUTION NOT USE 4 STEP IF USING AN AMPTROL REMOTE Neither the arc start switch nor the output con trol in the amptrol will function normally to shut off or control the out put ONLY USE 2 STEP In 2 Step position the arc start switch functions the same as without the Advanced Panel 1 Closing switch starts preflow then a fixed 0 5 sec ramp time from Minimum Start setting level See Item 7 to Weld setting 2 Opening switch initiates Downslope ramp time setting See Item 17 from Weld set ting to Crater fill level See Item 7 which then stops the arc and initiates Postflow time See Item 9 Note See Section B 7 for 2 Step operation during Downslope with Restart feature selected to be dis abled instead of enabled as shipped PRECISION TIG 375 LINCOLN 7 OPERATION B 7 n 4 Step position allows welding without continu ously holding the start switch trigger The arc start Switch functions in the following manner 1 Closing switch starts preflow then arc starts at Minimum Start setting level See Item 7 If the trigger is maintained closed after preflow time the output remains at the Start level until it is released 2 Opening switch initiates fixed 0 5 sec ramp time from Start setting level to Weld setting 3 Reclosing sw
15. 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 SYMP TOMS This column describes possible symptoms that the machine may exhibit Find the listing that best describes the symptom that the machine is exhibiting Step 2 POSSIBLE CAUSE The second column labeled POSSIBLE 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 generally it states to contact your local Lincoln Authorized Field Service Facility If you do not understand or are unable to perform the Recommended Course of Action safely contact your local Lincoln Authorized Field Service Facility 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 G ww 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 PRECISI
16. based on the Display momentary switch position Before welding with Display switch in center normal position the digital meter displays the preset welding amps set by Maximum Output control knob See Item 6 If in Stick mode using REMOTE See Item 5 the digital meter displays the preset welding amps set by the Remote control See Item 11 While welding with Display switch in center normal position the digital meter displays the actual welding amps with one amp resolution XXX and accuracy within 4 2A of reading Any time in TIG mode and while pressing the Display Switch to left the digital meter displays the amps pre set by the Minimum Output control knob See Item 7 Any time in Stick mode and while pressing the Display switch to left the digital meter displays the minimum amps rating of the machine See Item 7 Any time in either mode while pressing the Display Switch right to Volts position the digital meter displays actual output volts Volts is displayed with 0 1 volt res olution XX X and accuracy within 3 1V of read ing While pressing the Menu button when not welding see Menu Button and Display Button in previous section for Meter and Display switch functions POSTFLOW TIME This knob is used to set the TIG mode shielding gas postflow time over the range of about 2 to 60 seconds after the arc is shut off The postflow on time status is indicated by the Green
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18. panel light Postflow Time is x2 extendable if needed by inter nal control box selection See Internal Set Up Controls Gas preflow time for TIG mode is factory set at 0 5 second but shorter times are selectable with the Menu Button See 7a 10 THERMAL SHUTDOWN LIGHT This yellow LED 11 panel light turns on if the machine output is shut down because internal overheating has occurred and turns off when the thermostat resets REMOTE RECEPTACLE A 6 socket receptacle is provided for the connection of an Amptrol or other remote control See Figure B 2 When the Current Control Switch See Item 5 is in the REMOTE position the Amptrol or other remote 10K pot connected to the Remote receptacle con trols the TIG or Stick mode output within the range preset by the Maximum and Minimum Output con trols See Item 6 and Item 7 also 8 for meter dis play B 6 OPERATION B 6 When the Current Control Switch is in either LOCAL or REMOTE positions the arc start switch functions when connected to the Remote receptacle FIGURE B 2 REMOTE RECEPTACLE Front View ARC START SWITCH REMOTE OUTPUT CONTROL Max 10K ohm Min For 18 12P Plug LECO S12020 27 ADVANCED PANEL CONTROLS The following Advanced Control Panel controls are standard on the Precision TIG 375 Refer to Section B 10 Tig Weld Cycle Chart for graphic illustration of these TIG welding functions 12 TRIGGER
19. thru Background Current 40 60 is a typical initial setting Set as low as will maintain a pulse arc Will not drop below Min Output setting PRECISION TIG 375 LINCOLN Downslope ZERO For no arc out delay B 12 13 OPERATION MAKING A TIG WELD WITH AN AMPTROL 1 Install welding equipment per Section A 5 2 Setup controls per Section B 10 3 Turn on the shielding gas supply and torch coolant input supply if used Note The Precision TIG Under Cooler or Water Solenoid connected to the Cooler receptacle runs with 6 the Fan As Needed machine cooling fan See Maintenance Section D so the cooler fan and water pump will also not run continuously in idle but will run while welding 4 With the torch held safely away from everything close the Arc Start Switch of the Amptrol and set the gas flow meter Then open the switch The welder is now ready for welding B 13 Close the arc start switch This opens the gas valve to automatically purge air from the hose and torch then shields the arc strike area After the 0 5 sec ond preflow time the high frequency becomes available to strike the arc When the arc strikes the torch coolant if used starts to flow Also if welding DC TIG the high frequency shuts off just after the arc strikes Hold the arc start switch closed at minimum Amptrol Start level See Section B 10 until an arc is estab lished then i
20. to TIG mode See Item 3 Switch 1 Postflow Time Extension See Item 9 ON Doubles the time ranges OFF Standard time range as shipped Switch 2 2 Step Trigger Restart Feature See Figure B 3 ON Restart Enabled as shipped OFF Restart Disabled Switch 3 4 Step Trigger Restart Feature See Figure B 4 ON Restart Enabled OFF Restart Disabled as shipped Switch 4 Lift TIG Starting Does not function See Item 7a Switch 5 Crater Fill Level See Item 7 ON Level is minimum rating of the machine 2A OFF Level as shipped is Minimum Output setting same as Start level PRECISION TIG 375 LINCOLN 9 OPERATION B 9 FIGURE B 3 2 Step Trigger Modes emmener uen UP SLOPE DOWN SLOPE 2 STEP RESTART DISABLED With DIP Switch 2 OFF Actuate the trigger a second time during down slope to immediately end down slope Hold the trigger to maintain crater current 2 STEP RESTART ENABLED With DIP Switch 2 ON As Shipped Actuate the trigger a second time during down slope to activate up slope and restart PRECISION TIG 375 LINCOLN 10 OPERATION FIGURE B 4 4 Step Trigger Modes B 10 9 96 STARTICRATER CURRENT me UP SLOPE Hold the first trigger pull to maintain the starting current and delay up slope 4 STEP RESTART ENABLED With DIP Switch 3 ON Hold the second trigger
21. will open This condition will be indicated by the illumination of the yellow Thermal Shutdown Light on the front panel see Item 10 in Section B The fan will continue to run to cool the power source Postflow occurs when TIG welding is shut down but no welding is possible until the machine is allowed to cool and the yellow Thermal Shutdown Light goes out NO ARC PROTECTION The machine outputs Background OCV gas and HF will be shutdown if the trigger is closed without weld ing for 15 seconds to protect the Background resistor from overheating with F A N cooling off as well as to conserve on gas waste AUXILIARY POWER CIRCUIT BREAKER The 115vac auxiliary circuits and rear receptacle see Section A Auxiliary Power Connections are protected from overloads by a 15 amp circuit breaker located above the receptacle If the breaker trips its button pops out exposing a red ring When the circuit breaker cools the button can be reset by pressing it back in Note When the breaker trips not only will the recepta cle s auxiliary and cooler power be interrupted but so will the power to the shielding gas solenoid and machine cooling fan The Export models also include a 5 amp circuit break er located on the opposite side of the upper case back for protection of the 220vac Schuko type cooler recep tacle PRECISION TIG 375 LINCOLN D 2 MAINTENANCE D 2 SERVICE PROCEDURES Operation of the Precision TIG should be troubl
22. 0 1 pps to 20 pps One pulse cycle time 1 pps 10 to 05 sec range 15 PULSE ON SPOT TIME CONTROL This knob sets the time for Pulse or Spot modes ON TIME sets duration of the peak current as a percentage 5 to 95 on white scale of one pulse cycle The balance of the cycle time will be at the Background Current setting See Item 16 SPOT TIME sets the duration of the Spot pulse 0 5 to 5 0 seconds on red scale 16 PULSE BACKGROUND CURRENT CONTROL This knob controls the level of the Background Current as a percentage MIN 100 of the Peak REMOTE and or LOCAL output level See Item 6 down to the Minimum Output setting See Item 7 17 DOWNSLOPE TIME This knob is used to set the time over the range of zero to about 10 seconds to ramp down from weld setting to Crater fill level See Item 7 If the arc goes out after the Downslope time is initi ated the Downslope time is interrupted and the Postflow time is initiated This prevents Hi Freq re initiation during ramp down crater fill When using an Amptrol remote control where the downslope is controlled by the operator down to the crater fill level the Downslope time should be set to zero so as not to have the Downslope time delay when the arc start switch is opened 18 HIGH FREQUENCY INTENSITY CONTROL NOT SHOWN Allows setting the lowest intensity which still gives good TIG arc starting with minimized Radio Frequency Interferen
23. 1974 PR CAUTIONS DE S RET POUR LES MACHINES SOUDER TRANSFORMATEUR ET REDRESSEUR 1 Relier la terre le chassis du poste conformement au code de l lectricit et aux recommendations du fabricant Le dispositif de montage ou la piece souder doit tre branch une bonne mise la terre 2 Autant que possible l installation et l entretien du poste seront effectu s par un lectricien qualifi 3 Avant de faires des travaux l interieur de poste la debranch er l interrupteur la boite de fusibles 4 Garder tous les couvercles et dispositifs de s ret leur place LINCOLN for selecting a QUALITY product by Lincoln Electric We want you TL You to take pride in operating this Lincoln Electric Company product as much pride as we have in bringing this product to you CUSTOMER ASSISTANCE POLICY The business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment consumables and cutting equip ment Our challenge is to meet the needs of our customers and to exceed their expectations On occasion purchasers may ask Lincoln Electric for advice or information about their use of our products We respond to our customers based on the best information in our possession at that time Lincoln Electric is not in a position to warrant or guarantee such advice and assumes no liability with respect to such information or advice We expressly dis
24. 5 UP Upslope Time 0 Only setting for 551 amp 552 above 0 1 2 3 4 5 6 7 8 9 1 Default Factory Setting Indicated by blinking decimal point STICK Mode Menu with Advanced Control Panel installed Setting Description Selection 6 HS Stick Hot Start added to output setting 0 10 20 30 40 50 60 70 80 90 Stick Arc Force added to output setting 0 Softer arc 10 Crisper arc Default Factory Setting Indicated by blinking decimal point Without Factory installed Advanced Control Panel the Stick menu displays Any of the following actions will exit the menu display 1 Pressing and holding the Menu Button again for about 5 seconds 2 Allowing the menu display to be unchanged for about 15 seconds 3 Closing the arc start switch TIG Mode or starting the arc Stick Mode Note In Stick Mode the machine output will remain on while in menu display Re entering the menu displays the last parameter and setting that was displayed when the menu was exited All settings may be reset to the Factory Default Settings above by holding the Menu button pressed while turning on the machine s Power switch The display will show rES to indicate the defaults are reset PRECISION TIG 375 LINCOLN 8 DIGITAL METER AND DISPLAY SWITCH 3 digit LED meter is used to monitor the preset and actual welding procedure
25. 6 1 6 95 Red Baron Procedure are based on 503 10 93 Electrode Polarity DC AC Approximate Argon Electrode Tip Preparation Sharpened Balled Gas Flow Rate EWZr C F H I min Electrode Ewrh 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 15 A Up to 15 A 3 8 2 4 3 8 2 4 020 Up to 15 A 10 to 15A 5 to 20 A 5 10 3 5 5 10 3 5 040 Up to 80 A 20 to 30 A 20 to 60 A 5 10 3 5 5 10 3 5 1 16 Up to 150 A 30 to 80 A 60 to 120 A 5 10 3 5 9 13 4 6 3 32 Up to MAX A 60 to 130 A 100 to 180 A 13 17 6 8 11 15 5 7 1 8 X 100 to 180 A 160 to 250 A 15 23 7 11 11 15 5 7 Tungsten electrodes are classified as follows by the American Welding Society AWS 1 Thoria 2 Thoria 2 1 5 Lanthana 0 15 to 0 40 Zirconia sel EWCe 2 orange EWLa 1 black Ceriated Tungsten is now widely accepted as a substitute for 2 Thoriated Tungsten in AC and DC applications Balanced Wave Unbalanced Wave requires derating of the electrode PRECISION TIG 375 LINCOLN 1 ACCESSORIES 1 OPTIONAL EQUIPMENT FACTORY INSTALLED OPTIONS The basic Precision TIG 375 machine is factory equipped with e K2621 1 Precision TIG Advanced Control Panel Provides 2 4 step trigger with adjustable Puls
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27. 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 prod ucts 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 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 Also see item 1 b SAFETY gt SPARKS 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 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 WELDING and CUTTING 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 When not welding make certain no par
28. E 20 C to 40 04 to 104 F 40 C to 85 C 40 to 185 F TRANSFORMER INSULATION CLASS 180 1 ALSO CALLED INVERSE TIME OR THERMAL MAGNETIC CIRCUIT BREAKERS CIRCUIT BREAKERS WHICH HAVE A DELAY IN TRIPPING ACTION THAT DECREASES AS THE MAGNITUDE OF CURRENT INCREASES 50 60Hz IEC Max range exceeds 310A PRECISION TIG 375 LINCOLN 3 INSTALLATION A 3 SAFETY PRECAUTIONS Read entire installation section before starting installation 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 Precision TIG 375 grounding screw behind the reconnect panel cover located near the back of the left case side to a good electrical earth ground Always connect the Precision TIG 375 to a power supply grounded in accordance with the National Electrical Code and all local codes SELECT SUITABLE LOCATION Place the welder where clean cooling air can freely cir culate in through the top rear vents and out through the bottom rear vents 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 nui sance trips GRINDING Do not direct grinding particles
29. G ATENCAO tm BR Chinese LEIA E COMPREENDA AS INSTRUGOES DO FABRICANTE PARA ESTE EQUIPAMENTO E AS PARTES DE USO E SIGA AS PRATICAS DE SEGURANGA DO EMPREGADOR 15MM PBUOA A OHRBEEK BA 3880 CL TRHOKRSME HTP EU AAA PR AU ERRAND BH Fg EZ f SE SB 8 01 SHAD HA call gl quil anti ag ls LINCOLN 8 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 216 486 1751 WEB SITE www lincolnelectric com
30. ICY Y u WIRING DIAGRAM No 31508 130 omma varod 3d LNaWa noo 1504 100 SUNAIVSNIANOJ _ 8290 09709 VI2N31O4 01233 3014 09 09 33NVSSInd 129 SUNALVSNIANO 22221 qoy Loana OILS N oavaonvive 3oNv v THWWOISNVELADVITOA HOH i WIWHOISNVEL NIVW IL vale TWNOLLJOIJVASLLSATVAGIONTIOS owe OWASLLSKWAdIONSTOSSVO VS WNOIOVN oonulo313 UI d im 3009 19119373 OVASL i o L 091009 13 54951304 NIVW 221005 WAOE Sos NNOLLYN 2278 vanvs HOLMS NW x 3909 31NO13S Wad GANO B OL 1N3WaaN3u HOLMS ANV IOA NO HOLMSON V2S IVA y S 1nd1nO HOIMSANVIOd ZS 3ovHolddv FOIS IMO NO HDLMSONDIM VIS her HOIMSIBMOIDdN 15 e X 2 NOIXSNOO3H 30 UKU pu Sies ovast axd JOHLNOO ASS vH TOWINOD AISNGINIOSYSHOI N s WOO VOINOH12313 V 13ruv L OS S WO1SIS38 SSEYVSE kd EE nvaiavi GU 892 9 L 3aNVIAWOO 30 19 woIsisay owe SOE WOISISONIOH 9 x lt ETT
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32. ON TIG 375 LINCOLN 5 2 TROUBLESHOOTING E 2 Observe all Safety Guidelines detailed throughout this manual PROBLEMS POSSIBLE RECOMMENDED SYMPTOMS CAUSE COURSE OF ACTION OUTPUT PROBLEMS 1 Thermal shut down Dirt and dust may have clogged the cooling channels inside machine air intake and exhaust louvers may be blocked welding application may exceed recommended duty cycle Wait until machine cool down and thermal light goes out Blow out machine with clean dry low pressure air check air intake and louvers stay within recom mended duty cycle 2 Bad thermostat or its connections Meter doesn t light up 1 Losing AC supply to Control PC board 2 Loosing input to machine 3 Faulty Control PC board If all recommended possible areas of misadjustment have been Has output in No gas amp no hi freq Faulty trigger or hand foot Amptrol checked and the problem persists i or connections Contact your local Lincoln Authorized Field Service Facility in Tig mode 2 Faulty Protection PC board or bad connection to Control PC board 3 Losing trigger supply to Control PC board No output in both Stick and Tig 1 Bad connection at P4 of Control PC board 2 Faulty Control PC board 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 y
33. RETURN MAIN MENU IM898 PRELISIDN TIG 375 emm For use with machines having Code Numbers 11161 11162 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 Precision TIG 375 Welding Package shown with optional Be Advanced Control Panel c Us POS OPERATOR S MANUAL SO 9001 Designed and Manufactured Under a Quality Program Certified by ABS Quality to ISO 9001 Requirements CERTIFICATE NUMBER 30273 LI NCOLN Copyright Lincoln Global Inc 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 SAFETY WARNING CALIFORNIA PROPOSITION 65 WARNINGS A For Diesel Engines Diesel engine exhaust and For Gasoline Engines The engine exhaust from some of its constituents are known to the State this product contains chemicals known to the of California to cause cancer birth defects and State of California to caus
34. Unbalance 7096 Penetration AC TIG 139 126 63 K2622 1 60 AC DC Stick Balance TIG 102 92 46 K2624 1 Unbalance 7096 Penetration AC TIG 208 230 460 128 116 58 10096 AC DC Stick Balance TIG 80 72 36 Unbalance 7096 Penetration AC TIG 104 92 47 Idle Amps 68 62 31 4096 AC DC Stick Balance TIG 102 51 41 Unbalance 7096 Penetration AC TIG 125 63 50 60 AC DC Stick Balance TIG 92 46 37 Unbalance 7096 Penetration AC TIG 116 58 46 100 230 460 575 AC DC Stick Balance TIG 72 36 29 Unbalance 70 Penetration AC TIG 94 47 38 Idle Amps 62 31 25 Rated Power Factor Stick ___ 86min RATED OUTPUT NEMA EW1 Class Il 40 4096 AC DC Stick Balance TIG Unbalance 70 Penetration AC TIG 6096 AC DC Stick Balance TIG Unbalance 70 Penetration AC TIG 10096 AC DC Stick Balance TIG Unbalance 70 Penetration AC TIG Shown on Front of this IM manual with Under Cooler Cart and Advanced Control Panel Refer to Optional Equipment Exceeds NEMA Unbalanced Load Specification comparable for Auto Balance PRECISION TIG 375 LINCOLN 2 INSTALLATION A 2 ADDITIONAL OUTPUT CAPACITY Output Current Maximum Open Type of Output Auxiliary Power Range Circuit Voltage 2Amps DC 15Amp Circuit Breaker and NEMA 5 15R Duplex Receptacle for up to to STICK AND TIO Gc Constant Current p P AC DC OCV 80 115VAC 8 Amp Auxiliary Power R
35. a respirat ria THIS CEFR Elk Aik Mako wastes 5758 esi amp xdestu 297148 AS 7 217 7 amp AIzSHAIS oe las lui sui e bis jaa ji Gg el Ge call usi e Turn power off before servicing Desconectar el cable de ali mentaci n de poder de la m quina antes de iniciar cualquier servicio e D branchez le courant avant l entretien Strom vor Wartungsarbeiten abschalten Netzstrom v llig ff nen Maschine anhalten opere com as tampas removidas Desligue a corrente antes de fazer servico toque as partes el tricas nuas e X 7TT7A 9 UAUNEUD PIRK EFREZI FE e HEMMER e SHA AHS Aie A J it 4S dall e Do not operate with panel open or guards off No operar con panel abierto o guardas quitadas N op rez pas avec les panneaux ouverts ou avec les dispositifs de protection enlev s e Anlage nie ohne Schuizgeh use oder Innenschutzverkleidung in Betrieb setzen e Mantenha se afastado das partes moventes opere com os paineis abertos ou guardas removidas IPH ERALA 50 yal AHSA AREY Gils 13 ja Aaya Spanish AVISO DE PRECAUCION French ATTENTION German WARNUN
36. ble material away Do not weld on containers that have held combustibles ARC RAYS can burn 24 Observe additional Safety Guidelines detailed the beginning of this manual Wear eye ear and body protection PRODUCT DESCRIPTION The Precision TIG 375 is part of a new family of indus trial arc welding power sources providing constant cur rent single range square wave AC DC TIG GTAW with patented Micro Start Technology Presettable Min and Max Output controls and built in high fre quency stabilization for continuous AC TIG and DC TIG starting It also has AC DC Stick SMAW capability with adjustable Arc Force availability A TIG Pulse Panel Power Factor Capacitors and a Water Solenoid are available as field installed optional kits Also a new Undercarriage with double gas bottle rack is available for field installation as well as a new Under Cooler Cart which is also included in an available efficiently integrated entire TIG Welding Package with conve nient built in storage provisions for welding equipment and components The Precision TIG 375 includes advanced features such as Digital Meter Presettable control Auto Balance Fan As Needed F A N and Timers for fixed Peflow and variable Postflow shielding gas Also 2 Step 4 Step and Pulse TIG operation with adjustable Downslope Time control advanced controls are includ ed The model still features a Stick stud panel and a universal TIG t
37. ce Control knob is located on a recessed panel near the easy acces sible spark gap side panel As shipped the control is set to minimum PRECISION TIG 375 LINCOLN amp 8 OPERATION B 8 INTERNAL SET UP CONTROLS Precision TIG 375 Advanced Panel has the following additional control features which are set up using the DIP Switch S1 provided on the internal panel of this option Access to this internal panel is obtained by removing the two screws securing the top corners of the Precision TIG front control panel and swinging the con trol panel down to reveal the panel mounted on the sur face of the Precision TIG Control board CAUTION THE CONTROL BOARDS CONTAIN STATIC SEN SITIVE COMPONENTS To avoid possible damage to these components be sure to ground yourself by touching the machine s sheet metal while handling or making settings on the internal control box components PRECISION TIG ADVANCED PANEL M21115 Internal Panel P XEM 9 00000000 1234567 DIP SWITCH S1 DOES NOT FUNCTION OFF DIP SWITCH POSITIONS FACTORY SETTINGS STICK WELDING FEATURES Switch 6 Hot Start Level Does not function See Item 7a Switch Z7 Arc Force Level Does not function See Item 7a TIG WELDING FEATURES The following DIP switch feature selections function only when the Precision TIG is set
38. claim any warranty of any kind including any warranty of fitness for any customer s particular purpose with respect to such information or advice As a matter of practical consideration we also cannot assume any responsibility for updating or correcting any such information or advice once it has been given nor does the provision of information or advice create expand or alter any warranty with respect to the sale of our products Lincoln Electric is a responsive manufacturer but the selection and use of specific products sold by Lincoln Electric is solely within the control of and remains the sole responsibility of the customer Many variables beyond the control of Lincoln Electric affect the results obtained in applying these types of fabrication methods and service requirements Subject to Change This information is accurate to the best of our knowledge at the time of printing Please refer to www lincolnelectric com for any updated information 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
39. ct 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 In semiautomatic or automatic wire welding the electrode electrode reel welding head nozzle or semiautomatic welding gun are also electrically hot 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 Ground the work or metal to be welded to a good electrical earth ground Maintain the electrode holder work clamp welding cable and welding machine in good safe operating condition Replace damaged insulation Never dip the electrode in water for cooling 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 When working above floor level use a safety belt to protect yourself from a fall should you get a shock Also see Items 6 c and 8 LINCOLN 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 287 standards 4 b Use suitable clothing made from durable flame resistant 5 4
40. d for Fire Prevention During Welding Cutting and Other Hot Work available from NFPA 1 Batterymarch Park PO box 9101 Quincy Ma 022690 9101 Do not use a welding power source for pipe thawing LINCOLN 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 hoses fittings etc should be suitable for the application and maintained in good condition Always keep cylinders in an upright position securely chained to an undercarriage or fixed support Oylinders should be located Away from areas where they may be struck or subjected to physical damage safe distance from arc welding or cutting operations and any other source of heat sparks or flame Never allow the electrode electrode holder or any other electrically hot parts to touch a cylinder Keep your head and face away from the cylinder valve outlet when opening the cylinder valve Valve protection caps should always be in place and hand tight except when the cylinder is in use or connected for use Read and follow the instructions 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
41. e cancer birth defects other reproductive harm or 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 amp 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 AN FOR ENGINE powered equipment 1 Turn the engine off before troubleshooting and maintenance work unless the maintenance work requires it to be running 3 X 1 h To avoid scalding do not remove the radiator pressure cap when the engine is hot 1 b Operate engines in open well ventilated areas or vent the engine exhaust fumes outdoors ELECTRIC AND 3 gt MAGNETIC FIELDS may be dangerous 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 refuel ing to prevent spilled fuel
42. e free for the life of the machine Should a malfunction occur however the following procedures will be useful to trained service personnel with experience in repairing arc welding equipment COMPONENT ACCESS The following components are accessible for routine set up and periodic service without requiring removal of the case sides or roof Input Reconnect Panel refer Section A is located behind a removable panel on the rear of the left case side Remove the two screws with a screwdriver or a 3 8 9 5mm hex driver on the bottom corners of this panel to remove it e Control Box components and PC Boards refer Section B 6 are located behind the front control panel Remove the two screws with a screwdriver or a 3 8 9 5mm hex driver on the top corners of this panel to swing it down Spark Gap assembly refer Spark Gap Adjustment is located behind a removable panel on the rear of the right case side under the torch box Remove the screw with a screwdriver or a 3 8 9 5mm hex driver on the bottom center of this panel to remove it SPARK GAP ADJUSTMENT The spark gap is set at the factory to a gap of 0 015 inches 0 4 mm See Figure C 1 This setting is ade quate for most applications Where less high frequen is desired the setting can be reduced to 0 008 inch es 0 2 mm WARNING Use extreme caution when working with circuit of the high frequency The high voltages developed can be let
43. e sizes and fuses per Section A 2 OUTPUT CABLES CONNECTIONS AND LIMITATIONS WARNING avoid being startled by a high frequency shock keep the TIG torch and cables in good condition Turn the power switch of the power source OFF before installing adapters on cable or when con necting or disconnecting adapter plugs to power source Refer to Figure A 2 for the location of the WORK and STICK terminals as well as the TIG Torch connection panel Recommended Cable Sizes for Combined Lengths of Copper Work and Electrode Cables using 75 C Wire Machine Rating 0 100 Ft 101 to 200 Ft 375A 40 1 42 4 mm 1 0 53 5 mm 2 0 67 4 WORK CABLE CONNECTION A 15 2 0 weld cable with clamp is available K2150 1 or included with the Precision TIG Welding Package model Otherwise it is user provided With power source off connect a separate work cable to the 1 2 13 threaded WORK stud of the welder and secure a tight connection with the flange nut provided The work cable should be routed through the cable strain relief hole provided in the base directly below the welding output terminal Note If the Precision TIG is equipped with an Under Cooler or Under Storage unit the coiled work cable and clamp or excess work cable length may be con veniently stored in the drawer while remaining con nected STICK ELECTRODE CABLE CONNECTION If manual stick welding is desired with power source o
44. eceptacle AC DC GTAW 115VAC 5 Amp weld Switched Cooler Receptacle Stick SMAW RECOMMENDED INPUT WIRE AND FUSE SIZES For all Stick DC TIG and Balanced AC TIG Welding For Unbalanced AC TIG Welding Above 275 Amps at 375 40 Duty Cycle with out Standard Power 350A 40 Duty Cycle Auto Balance Penetration with Factor Correction Capacitors out Standard Power Factor Correction Capacitors Based on the 1999 U S National Electrical Code Based on the 1999 U S National Electrical Code Input Type 75 Type 75 75 75 Input Fuse Ampere Copper Wire in Copper Fuse Input Copper Wire in Copper Conduit AWG Conduit AWG Voltage Super Lag Rating phase or Breaker Rating on Frequency Size Nameplate 208 1 60 150 230 1 60 15 460 1 60 575 1 60 50 220 230 1 50 60 150 380 400 1 50 60 110 415 1 50 60 110 IEC Sizes Ground Wire in Super Lag Ampere Sizes Ground Wire in 40 C 104 F Conduit AWG or Breaker Rating 40 C 104 F Conduit AWG Ambient IEC Sizes Size Ambient IEC Sizes Lemma seem _ saam seama m o 21 1 1 1 12 02 51 41 19 63 4 21 2 mm2 6 13 3 mm 110 62 4 21 2 mm 6 13 3 PHYSICAL DIMENSIONS A N 1 2 49 7 in 28 0 in 41 0 in 751 lbs K2624 1 711 mm 1041 mm 341 kgs TEMPERATURE RANGES OPERATING TEMPERATURE RANGE STORAGE TEMPERATURE RANG
45. ect Amptrol or Remote Mach Min PEAK Range or SEE ITEM 6 amp 7 MIN Setting PULSE FREQ ON TIME as w o Panel Adjustable Adjustable MINIMUM OUTPUT 0 1 20 pps 5 95 7 Start SETTING SEE ITEM 14 SEE ITEM 15 Adjustable 2 50A _7 ____ SEE ITEM 7 SPOT TIME Adjustable 0 5 5 0 sec SEE ITEM 15 PREFLOW Default 0 5 sec Menu Set SEE ITEM 7a UPSLOPE DOWNSLOPE POSTFLOW pe Adjust 0 10 sec Adjust 2 60 sec 2 Menu Set MIN Setting 100 Peak ITEM 7a SEE ITEM 16 ebd START TIME CRATER FILL TIME Manual Manual in 2 4 Step in 4 Step w Restart Disabled SEE ITEM 12 SEE ITEM 12 amp TIG Welding Features SETUP GUIDELINES FOR TIG WELDING WITH AN AMPTROL Both the Hand and Foot Amptrols work in a similar manner They are meant to be used for remote current control for TIG welding using the machine s 2 Step trigger mode See Item 12 The Amptrol is capable of controlling the output of the Precision TIG over the range between the level preset by the Minimum Output control when the Amptrol is at its inactivated state and the level preset by the Maximum Output control when the Amptrol is at fully activated state It is important to note that even with the Precision TIG s new MicroStart Technology some tungstens may be difficult to start at the low 2 amps minimum rating of the machine Rather than guessing
46. ent 3 b TIG mode Bottom position No panel light When the Polarity Switch is set to AC the TIG mode provides continuous high frequency to stabi lize the arc for AC TIG welding Hi Freq turns on after preflow time with the arc start switch closure and turns off when the arc goes out after the arc start switch opens are electrically HOT to Work Arc voltage and current are sensed to determine if the arc is established or out PRECISION TIG 375 LINCOLN 4 OPERATION B 4 When the Polarity Switch is set to DC or the TIG mode provides high frequency only for starting Hi Freq turns on after pre flow time with the arc start switch closure and turns off when the arc is established Also functions for polarity to permit balling of tungsten for AC TIG welding 4 AC BALANCE CONTROL The potentiometer control permits AC wave balance adjustment from Max Penetration 85 negative wave with the control at Max full CW position to Max Cleaning 65 positive wave with the control set near min imum CCW position Full minimum CCW position is the Auto Balance position which is indicated by the Green panel light turning on This feature automatically provides the proper amount of cleaning and penetration for nor mal AC TIG welding The mid position is the Balanced position 50 positive and negative waves The Balance control is only functional if the machine is set to AC p
47. ep Trigger el ei aed de ee B 8 4 Step Trigger Modes nennen nenne nnne nennen B 9 TIG Welding Cycle Chart diner anne B 10 Setup Guidelines for TIG Welding with an Amptrol B 10 B11 Making a TIG Weld with an B 12 ACCOSSOLFIGS aaepe rater duced Section C Optional Equipment iii C 1 Maintenance ei ettet deae Section D Safety Precauliors n te redi iD pre re de D 1 Routine and Periodic Maintenance D 1 Overload Protection u kuu ent andre D 1 Service Procedures Component Access Spark Gap Adjustment D 2 Under Cooler Service a decere D 2 Troubleshootlhg 22 animent Section Safety Precautions sisi E 1 How To Use TroubleShooting Guide ss E 1 2 to E 7 Diagrams etel eet oe atl tenant Section F Wiring Diagrams stent ttt ttt ttt ttt tette F 1 F 2 Dimension Prints unes F 3 F 4 Paris EISE 2 s euer P 558 vi 1 INSTALLATION 1 TECHNICAL SPECIFICATIONS PRECISION TIG 375 K2624 1 Domestic Package 60Hz K2622 1 Domestic K2622 2 Canadian 60Hz RATED INPUT SINGLE PHASE ONLY mw Duty Cycle Applications Voltage 10 Max Amps With Power Factor Capacitor 40 AC DC Stick Balance TIG 112 102 51
48. er con trols and Down slope timer for TIG welding Also includes adjustable Hot Start and Arc Force internal panel controls for stick welding and other user selec table features Power Factor correction capacitor A 3 8 Adapter 820403 4 for air cooled torch con nection Accessories that are factory installed with the Domestic model K2622 1 to make up the Domestic Welding Package K2624 1 include K1828 1 Under Cooler Cart 3100211 Harris Argon Flow Regulator with 10 hose K870 Foot Amptrol K1784 4 25 PTW 20 water cooled TIG Torch K918 2 Zippered Torch Cover KPi510 Parts Kit for Torch K2150 1 Work Lead Assembly See below for more detailed descriptions FIELD INSTALLED OPTIONS The following Options Accessories are available for the Precision TIG 375 and are installed per instructions in this manual and or provided in the package K1828 1 Under Cooler Cart Includes a cooler in a drawer with hoses and a lockable storage drawer on a dual bottle undercar riage see below K1869 1 Undercarriage Includes a dual bottle rack with chain and an under carriage with 5 front casters 10 rear wheels and a handle K1830 1 Water Solenoid Kit Provides for stopping flow of external water supply Connects to coolant inlet and cooler receptacle of Precision TIG Can not be used with a water cooler K870 Foot Amptrol Single pedal foot activation of arc start switch and output control wit
49. ering circuits may be needed for the external circuits INPUT FROM ROBOT 18Vac 10ma switch ARC ESTABLISHED OUTPUT TO ROBOT High Not Welding Low Welding Robotic d Precision TIG Control Common Common In addition a Peak Pulse output signal is provided at J21 receptacle on the Advanced Control PCB This output provides a 0 2A rated switch circuit between pin 1 and pin 2 com for an external 40VDC supplied relay with coil diode This switch closes when the Peak Pulse is on and opens when off PRECISION TIG 375 LINCOLN B 1 OPERATION B 1 SAFETY PRECAUTIONS Read and understand this entire section before operat ing the machine WARNING N ELECTRIC SHOCK can kill Only qualified personnel should perform this installation Turn the input power OFF at the disconnect switch or fuse box Do not touch electrically live parts or electrode with skin or wet cloth ing Insulate yourself from work and ground Always wear dry insulating gloves Read and follow Electric Shock Warnings in the Safety section if weld ing must be performed under electrical ly hazardous conditions such as weld ing in wet areas or on or in the work piece FUMES AND GASES 9 can dangerous Keep your head out of fumes AR Use ventilation or exhaust to remove fumes from breathing zone WELDING SPARKS can cause fire or gt explosion Keep flamma
50. fety Precautions Select Suitable E OCatiOn cn EE SLACK u E EE unus A 3 Undercarriage Lifting and Moving u n A 3 Environmental Rating A 3 Machine Grounding and High Frequency Interference Protection A 3 A 4 Input and Grounding Connections 4 Output Cable Connections and Limitations A 5 Work Cable Connection A 5 Stick Electrode Cable Connection A 5 TIG Torch Connection ss A 6 Auxiliary Power Connections siisii asaini A 7 Remote Control If Used ss A 7 Robotic Interface Connection A 7 A 8 OPERATION uu SON Section B 1 Safety Precautions sense B 1 B 1 EI Em B 1 Duty m B 1 Recommended Processes and Equipment B 2 Controls and Settings Peut a B 3 Thru B 6 Internal Set Up Controls enne nennen nnn nnns B 7 Stick Welding Features u g ee B 7 TIG Welding Features ii B 7 2 St
51. ff connect a stick electrode cable to the 1 2 13 threaded STICK Electrode stud of the welder and secure a tight connection with the flange nut provided The electrode cable should be routed through the cable strain relief hole provided in the base directly below the welding output terminal WARNING DISCONNECT STICK ELECTRODE WELDING CABLE WHEN TIG WELDING EVEN THOUGH HI FREQ IS NOT APPLIED TO THE PRECISION TIG STICK TERMINAL IT WILL BE ELECTRICALLY HOT TO WORK WHEN TIG WELDING PRECISION TIG 375 LINCOLN A 6 INSTALLATION A 6 FIGURE A 2 ege 9 a ce P o o e e 4 REMOTE e e TIG TORCH CONTROL gt a CONNECTION RECEPTACLE PANEL STICK O WORK ELECTRODE STUD STUD Shown without hinged dud cover TIG TORCH CONNECTION The Precision TIG torch connection box located on the right side of the machine provides all the input and output connections for the installation of both air cooled and water cooled TIG torches with fittings con forming to Compressed Gas Association CGA stan dards Note The Precision TIG provides an insulated Torch Reel and Holster for handy and safe storage of con nected torch when not welding and excess torch cable length while welding A WARNING Combination connectors Power Water and Po
52. 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 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 EMF fields may interfere with some pacemakers and welders having a pacemaker should consult their physician before welding 1 d Keep all equipment safety guards covers and devices in posi tion 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 Exposure to EMF fields in welding may have other health effects which are now not known All welders should use the following procedures in order to In some cases it may be necessary to remove safety d minimize exposure to fields from the welding circuit 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 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 1 f Do not put your hands near the engi
53. h 25 plug cable K963 3 Hand Amptrol Fastens to torch for convenient thumb activation of arc start switch and output control with 25 plug cable K814 Arc Start Switch Needed for TIG welding without an Amptrol Includes 25 plug cable and attaches to torch for convenient finger control Magnum PTA and PTW Series Torches All Air Cooled or Water Cooled Magnum TIG Torches may be used with the Precision TIG 375 Connection adapters are only required for Air Cooled Torches Refer to Diagrams on A 7 K2166 1 7 8 Torch Connector for PTA 26 one piece K2166 2 1 2 stud Connector for PTA Torch two piece K2166 3 3 8 TIG Torch Connector for PTA 9 17 one piece Included as S20403 4 with Precision TIG models 3100211 Harris Argon Flow Regulator Includes 10 hose K2150 1 Work Lead Assembly 15ft 2 0 cable with 1 2 stud lug and work clamp PRECISION TIG 375 LINCOLN D 1 MAINTENANCE D 1 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 high frequency shock keep the TIG torch and cables in good condition ROUTINE AND PERIODIC MAINTENANCE Very little routine maintenance is necessary to keep your Precision TIG 375 running i
54. h Thermostat protection of the primary and secondary transformer coils The Precision TIG machines do not have Hi Frequency available at the Stick electrode stud therefore stud connection adapters such as LECO S19257 series cannot be used for torch connection RECOMMENDED EQUIPMENT INTERFACE TIG water cooled TIG air cooled Machine Input Cable Clamp Gas Reg Hose Magnum Torch Magnum Parts Work Clamp Lead Foot Amptrol User provided included 15 ft included pu PT375 Welding Package K2624 1 PTW20 included KP510 and K918 2 included K870 included PT375 K2622 1 2 User provided LE Harris 3100211 9 or PTA17 KP507 or KP508 K2150 1 Work Lead Assembly K870 PRECISION TIG 375 LINCOLN 3 OPERATION CONTROLS AND SETTINGS B 3 The Front Control Panel contains the knobs and switches necessary for adjusting the operation of the Precision TIG 375 with function indicator lights and an electronic display for volts and amps The components are described below FIGURE B 1 CONTROL PANEL 1 POWER SWITCH 2 POLARITY SWITCH 3 MODE SWITCH 4 AC BALANCE CONTROL 5 LOCAL REMOTE CURRENT CONTROL SWITCH 8 STICK S Shawn without hinoed tid cover 6 MAXIMUM OUTPUT CONTROL 7 MINIMUM OUTPUT CONTROL AND DISPLAY SWITCH 7a MENU BUTTON AND DISPLAY SWITCH 8 DIGITAL METER DISPLAY SWITCH 9 POSTFLOW TIME 10 THERMAL SHUTDOWN LIGHT
55. hal Turn the input power off using the disconnect switch or fuse box before working inside the machine This is particularly important when working on the secondary circuit of the high voltage transformer T3 because the output volt age is dangerously high FIGURE C 1 SPARK GAP Note In highly dirty environments where there is an abundance of conductive contaminants use a low pressure air stream or a firm piece of paper to clean out the spark gap Do not disturb the factory gap set ting To check the spark gap 1 Turn the input power off per above 2 Remove the access panel on the right case side See Component Access 3 Check the spark gap spacing with a feeler gauge If adjustment is required 1 Adjust the gap by loosening the Allen head screw on one of the aluminum blocks reset the gap and tighten the screw in the new position If spark gap is correct 1 Reinstall the access panel on the right case side UNDER COOLER SERVICE The required maintenance and service instructions for the Under Cooler are provided in the operator s manu al IM723 provided with the Under Cooler Cart PRECISION TIG 375 LINCOLN 1 TROUBLESHOOTING 1 HOW 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
56. he gas line torch or connections 4 Helium blend is used as a shield ing gas If all recommended possible areas of misadjustment have been checked and the problem persists Contact your local Lincoln Authorized Field Service Facility If all recommended possible areas of misadjustment have been checked and the problem persists Contact your local Lincoln Authorized Field Service Facility 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 PRECISION TIG 375 LINCOLN 7 TROUBLESHOOTING E 7 Observe all Safety Guidelines detailed throughout this manual PROBLEMS POSSIBLE RECOMMENDED SYMPTOMS CAUSE COURSE OF ACTION TIG PROBLEMS Arc pulsates in AC polarity Micro switch 52 on polarity switch polarity is o k does not open in AC polarity Black area along weld bead 1 or organic contamination from work piece 2 Tungsten electrode may be conta minated 3 Leaks in gas line torch or con nections Output quits momentarily gas flow 1 May be caused by hi freq interfer and hi freq are also interrupted ence Check that machine is grounded properly Surrounding machines that generate hi freq also should be properly grounded 2 Ground connection of Protection PC board may has become loose 3 Gro
57. hine with Advanced Control panel only Bad Downslope potentiometer R12 or its connection 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 PRECISION TIG 375 LINCOLN amp TROUBLESHOOTING Observe all Safety Guidelines detailed throughout this manual PROBLEMS POSSIBLE RECOMMENDED SYMPTOMS CAUSE COURSE OF ACTION Stick electrode blast off when arc is struck Stick electrode sticks in the weld puddle Poor starting in DC polarity Arc flutters in DC polarity o k in AC polarity Arc flutters in both DC amp AC polari ties STICK WELDING PROBLEMS 1 Current may be set too high for electrode size Machine with Advanced Control PC board only Hot Start Menu setting too high Current may be set too low for electrode size Machine with Advanced Control PC board only Arc Force Menu setting too low TIG WELDING PROBLEMS Input line may be too low Bad connection at P11 of Control PC board Bad Background rectifier back ground resistor R7 or background diode D2 1 Tungsten not sharp 2 Bad free wheeling diode D1 or its connection 1 Tungsten electrode may be too large in diameter for the current setting 2 Gas shielding may be insufficient 3 Contaminated gas or leaks in t
58. iHuv 34075 ANNOHDHOVE cor 0017008 10 OI8WY2 30 801 0017007 3SVH430 IN3W39NVHD Si WAIOWOI 51800971 CHOW SDNSNOGW 3QONO I Su VONITOXHH VIT SOLINI 1 Woaviievss vans o DndNI 8319 1 38013008 10010 VSOTA TOOVAT VNI809 32ML VIN 3N 808 ND AOL IVTBN3NISOS cuyzio SaRVSU GSUIYWO nV 18 OP VNTR NODOSLONI SBHOLDVEVD Jud 28019 100 22 NOILI310Hd SHNILYSNIONOD O1H318V N340 1 35330 OVD Yves MATE INSPRONVEO OHIVSNIONOD 20 REUSI0O 30 JSTSIQU 90 IVNOIOdO OQVZNVAY 10H1NO2 13NVd NOLLdO 3QNVWWOO TVNOLLdO T3NVd TOHLNOO Q39NVAQV mm va TEL 1 ON OLONZH OQv3oNvive 9313 13371093 s3oNvisidY 5948 MOT 1808 39NV V LINCOLN E PRECISION TIG 375 zee 4 pre o1oway 2 SoNnvIs
59. ice Facility 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 PRECISION TIG 375 LINCOLN TROUBLESHOOTING Observe all Safety Guidelines detailed throughout this manual PROBLEMS POSSIBLE RECOMMENDED SYMPTOMS CAUSE COURSE OF ACTION No hi freq Hi freq intensity too weak Hi freq on continuously in DC Tig Hi freq shuts off after starting in AC Tig HI FREQ PROBLEMS Circuit breaker 1 open Bad connection at P12 of Control PC board Spark gaps shorted Faulty Control PC board Dirty spark gap or improper gap setting Faulty Arc Starter assembly Bad connection at P11 of Control PC board Micro switch S2A is not engaged amp disengaged properly when switch ing between DC amp AC polarity S2A locates on the Polarity switch Faulty Control PC board Micro switch S2A is not engaged amp disengaged properly when switch ing between DC amp AC polarity 52 locates on the Polarity CAUTION If all recommended possible areas of misadjustment have been checked and the problem persists Contact your local Lincoln Authorized Field Service Facility If for any reason you do not understand the test procedures or are unable to perform the tests repairs safely contact you
60. itch initiates Downslope ramp time setting See item 17 from Weld setting down to the Crater fill level See Item 7 of the machine 4 Reopening switch after Downslope time holds Crater fill level until switch opens then stops the arc and initiates the Postflow Time See Item 9 Or reopening switch during Downslope time immediately stops the arc and initiates the Postflow Note See Section B 7 for 4 Step operation during Downslope with Restart feature selected to be enabled instead of disabled as shipped 13 PULSE SPOT MODE SWITCH Turns on the Pulse Mode as indicated by the Green panel light turning on PULSE ON provides a Peak current level set by REMOTE and or LOCAL control of the output cur rent See Item 5 for a time determined by the Pulse Frequency Control setting See Item 14 and the ON Time See Item 15 The balance of the cycle time is at the Background Current level See Item 16 The Green panel light blinks at the pulse frequency and time setting rate Pulsing begins after upslope when the output cur rent rises above the Background Current level and ends when the output current drops below this level SPOT ON mode provides the peak current level set by the Maximum Output Control for a time deter mined by the SPOT TIME control see below The red panel light is on for Spot mode 14 PULSE FREQUENCY CONTROL This knob is used to set the Pulse Frequency over the peak pulse range of about
61. k and ground e No toque las partes o los electrodos bajo carga con la piel o ropa moja da Aislese del trabajo de la tierra Ne laissez ni la peau ni des v te ments mouill s entrer en contact avec des pi ces sous tension Isolez vous du travail et de la terre e Ber hren Sie keine stromf hrenden Teile oder Elektroden mit Ihrem K rper oder feuchter Kleidung Isolieren Sie sich von den Elektroden und dem Erdboden toque partes el tricas e elec trodos com a pele ou roupa molha da Isole se da e terra OMRPORABA 7 2 ATUSHRELTFEL Sibi T 8 o 5544 245 RE 84 uc yya Sub GHAR 249 AAS Ug 2 Gall el jad Gali ye J peep AN il gS QU Gad Dal DE deux Keep flammable materials away Mantenga el material combustible fuera del rea de trabajo Gardez l cart de tout mat riel inflammable Entfernen Sie brennbarres Material e Mantenha inflam veis bem guarda dos EVA e RUE 9 1455 15 RET ug 39 Juni ALIM al gl e Wear eye ear and body protection Prot jase los ojos los o dos y el cuerpo Prot gez vos yeux vos oreilles et votre corps Tragen Sie Augen Ohren und K r perschutz
62. mmended Failure to observe these recommended installation procedures can cause radio or TV interference prob lems and result in unsatisfactory welding performance resulting from lost high frequency power INPUT and GROUNDING CONNECTIONS A WARNING ELECTRIC SHOCK can kill Turn the input power OFF at the disconnect switch or fuse box before working on this equipment 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 Remove the reconnect panel cover located near the back of the left case side to reveal the reconnect panel Welder supply line entry provision is in the case rear panel Entry is through a 1 75 inch 44 mm diameter hole in the case back Appropriate supply line strain relief clamp is provided by installer See Figure A 1 FIGURE A 1 CONNECT INPUT POWER LEADS NL GROUND LEAD 9 CONNECT INPUT VOLTAGE LEVEL All connections should be made in accordance with all local codes and national electrical codes Installation by a qualified electrician is recom mended 1 Connect the terminal marked below the recon nect panel to an earth ground 2 Connect the input leads to terminals marked L1 U and L2 V on the reconnect panel Use a single phase line or one phase of a two or three phase line 3 On multiple input voltage welders be sure the reconnect panel is connected for the voltage being sup
63. mum amps rating of the machine PRECISION TIG 375 LINCOLN 5 OPERATION B 5 7a MENU BUTTON AND DISPLAY SWITCH Pressing and holding the Menu Button for about 5 seconds enters the menu display which allows Selection of up to seven programmable parameters Preflow Upslope Hot Start Arc Force etc is dis played on the digital meter by momentarily pressing and releasing the MENU button to step through the parameters Setting of the desired level displayed on the digital meter for the selected parameter by pressing the DISPLAY momentary switch toggle to the right to increase the level setting or to the left to decrease it DIGITAL DISPLAY SELECT SET DISPL AY DISPLA Setting Description Selection 1 HF High Freq Scratch start TIG No Hi Freq Normal Hi Freq start and weld Lift TIG Touch start w o Hi Freq PF Preflow time No Preflow Selection 3 SS MicroStart Start Pulse 0 No AC pulse Low DC pulse soft start High AC DC pulse forceful start HS setting see below for each pulse when Pulse mode welding anodized aluminum Default Factory Setting Indicated by blinking decimal point Only selectable with Factory installed Advanced Control Panel TIG Mode Menu with Advanced Control Panel installed Description Selection 4 HS TIG Hot Start of output setting 0 Only setting for SSO above 10 20 30 40 50 60 70 80 90 Selection
64. n top condition No specific schedule can be set for performing the follow ing items factors such as hours of usage and machine environment should be considered when establishing a maintenance schedule Periodically blow out dust and dirt which may accu mulate within the welder using an air stream Inspect welder output and control cables for fraying cuts and bare spots Inspect the spark gap at regular intervals to maintain the recommended spacing See the Service Procedures See Service Procedures in this Section for complete information on spark gap set tings The fan motor has sealed ball bearings which require no maintenance OVERLOAD PROTECTION FAN AS NEEDED F A N The Precision TIG 375 has the F A N circuit feature which means the cooling fan will operate only while welding then for about 8 minutes after welding has stopped to assure proper machine cooling This helps reduce the amount of dust and dirt drawn into the machine with the cooling air The cooling fan will oper ate briefly when the machine power is initially turned on and continuously while the yellow Thermal Shutdown Light is lit see Thermostatic Protection THERMOSTATIC PROTECTION This welder has thermostatic protection from excessive duty cycles overloads loss of cooling and excessive ambient temperatures When the welder is subjected to an overload or inadequate cooling the primary coil thermostat and or secondary coil thermostat
65. ncrease the output to the desired welding level and push the torch in the direction of travel At the end of the weld decrease the Amptrol output to the crater fill level before releasing the arc start switch to start the Postflow time Hold the torch gas shielding over the solidifying weld crater while post flow time expires and the gas valve reopens The torch coolant if used continues to flow for up to 8 minutes after the arc goes out with the Fan As Position the tungsten electrode at the start of the weld at a 65 to 75 angle with the horizontal in the direction of pushing travel so that the electrode is approximately 1 8 4 mm above the work piece Needed feature to assure torch cooling Repeat steps 5 through 7 to make another weld RECOMMENDED ELECTRODE AMPERAGE RANGES Precision TIG 375 SMAW Process ELECTRODE POLARITY 3 32 1 8 5 32 Fleetweld 5P Fleetweld 5 DC 40 70 75 130 90 175 Fleetweld 180 DC 40 80 55 110 105 135 Fleetweld 37 DC 70 95 100 135 145 180 Fleetweld 47 DC 75 95 100 145 135 200 Jet LH MR DC 85 110 110 160 130 220 Blue Max Stainless DC 40 80 75 110 95 110 Red Baron Stainless 40 70 60 100 90 140 Mild steel procedures are based on recommended procedures listed C2 10 8 94 and the maximum rating of the Precision TIG 375 Excaliber 7018 procedures are based on Jet LH 78 MR Blue Max procedures are based on C
66. ne fan Do not attempt to override the governor or idler by pushing on the throttle control rods while the engine is running S 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 AY Connect the work cable to the workpiece as close as possible to the area being welded 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 Do not work next to welding power source Mar 95 LINCOLN B 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 conta
67. olarity and TIG mode 5 LOCAL REMOTE CURRENT CONTROL SWITCH A 2 position switch selects how the welding output is controlled for both Stick and TIG Modes LOCAL Top position selects output control only by the machine panel Output Control See Item 6 REMOTE Bottom position selects output control to also be by an Amptrol See Item 6 or other remote 10K pot control connected to the Remote recepta cle See Item 11 This switch selection is indicted by the Green panel light turning on In either position the arc start switch functions when connected to the Remote receptacle See Item 11 6 MAXIMUM OUTPUT CONTROL The large knob is used to set the output welding current over the rated output range of the machine With the Current Control switch to LOCAL position this knob sets the welding output level Arc voltage and current are sensed to determine if the arc is established or out With the Current Control switch to REMOTE posi tion this knob sets the maximum welding level that the Peak output can be set with the remote Amptrol The new MicroStart Technology minimum current circuit provides for low end welding down to 2 amps previously unobtainable on an SCR platform TIG machine 7 MINIMUM OUTPUT CONTROL AND DISPLAY SWITCH A smaller knob is used to preset the minimum cur rent level only for TIG mode Pressing the Display momentary switch toggle left to Minimum Set posi tion dis
68. om shorts and overloads by a 15 amp circuit breaker located above the receptacle If the breaker trips its button pops out exposing a red ring When the circuit break er cools the button can be reset by pressing it back in Note When the breaker trips not only will the auxil iary and cooler power be interrupted but so will the power to the shielding gas solenoid and machine cooling fan DE cootantin 78 14 LH OUTPUT front Panel NPUT back Pane 2 3 For Gas Supply hose with 5 8 18RH male Provided with Weld Package model For Coolant Supply Hoses with 5 8 18LH male Provided with Weld Package model or Under Cooler Cart WARNING uxetua WATER Coo LER WHEN USING AIR COO LED TO RC HES The Precision TIG Export models also provide a grounded 220vac Euro type Schuko receptacle and a 5 amp circuit breaker located on the upper case back on the reconnect side of the machine intended for use with a 220vac water cooler REMOTE CONTROL If Used The Foot Amptrol included with the Precision TIG Welding Package or other Remote accessory is installed by routing the plug of its control cable up through the left cable strain relief hole provided in the base see Figure A 2 then connecting the 6 pin plug to the mating Remote receptacle behind the stud panel cover See Operation Section B 2 for mating plug wiring Note If the Precision TIG is equipped with an Under Cooler o
69. orch connection box for simultaneous but separated electrode outputs The Precision TIG 375 has enhanced Features which includes the following MicroStart I Auto Balance optimized Menu button added Spot On selection added PIPE THAWING The Precision TIG 375 is not recommended for pipe thawing Duty Cycle The duty cycle is based upon a 10 minute time period i e for 40 duty cycle it is 4 minutes welding and 6 minutes idling If the rated duty cycle is significantly exceeded the thermostatic protection will shut off the output until the machine cools to a normal operating temperature Refer to Specification Section A 1 PRECISION TIG 375 LINCOLN 2 RECOMMENDED PROCESSES AND EQUIPMENT RECOMMENDED PROCESSES The Precision TIG 375 is recommended for the TIG GTAW and Stick SMAW welding processes within its output capacity range of 2 amps DC or 5 amps AC to 420 amps AC DC It is compatible with most Magnum TIG accessories refer Equipment Limitations as well as many industry standard items such as TIG torches hoses and water coolers PROCESS LIMITATIONS Precision TIG machines are not recommended for arc gouging due to it s limited output capacity and are also not recommended for pipe thawing OPERATION B 2 EQUIPMENT LIMITATIONS The Precision TIG machines are protected from over loads beyond the electrical ratings and duty cycles per the Specifications Section A 1 A 2 wit
70. ou proceed PRECISION TIG 375 LINCOLN TROUBLESHOOTING Observe all Safety Guidelines detailed throughout this manual PROBLEMS POSSIBLE RECOMMENDED SYMPTOMS CAUSE COURSE OF ACTION Meter does not light up Meter does not display V Volt or Min A Minimum current No control on post flow time Pre flow amp Post flow time too long METER PROBLEMS Bad meter or its connection Bad connection at P8 of Control PC board Faulty Control PC board Bad Display switch or its connec tion Bad connection at P9 of Control PC board GAS PROBLEMS Circuit breaker CB1 open Press CB1 in to reset Bad connection at P12 of Control PC board Faulty gas solenoid valve SV1 or its connection Faulty Control PC board Faulty potentiometer R3 or its connection Bad connection at P9 of Control PC board For Postflow the DIP switch set ting on the Advanced Control PCB if installed may be set for time x2 For Preflow Menu setting too long Missing plug P3 on Control board or bad connection at when an Advanced Control PC board is not present If all recommended possible areas of misadjustment have been checked and the problem persists Contact your local Lincoln Authorized Field Service Facility If all recommended possible areas of misadjustment have been checked and the problem persists Contact your local Lincoln Authorized Field Serv
71. overings are free of cuts and cracks that allow high frequen cy leakage Cables with high natural rubber content such as Lincoln Stable Arc better resist high fre quency leakage than neoprene and other synthetic rubber insulated cables 4 Keep the torch in good repair and all connections tight to reduce high frequency leakage 5 The work terminal must be connected to a ground within ten feet of the welder using one of the fol lowing methods A metal underground water pipe in direct contact with the earth for ten feet or more 3 4 19 mm galvanized pipe or a 5 8 16 mm solid galvanized iron steel or copper rod driven at least eight feet into the ground The ground should be securely made and the ground ing 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 This is not rec ommended 6 Keep all access panels and covers securely in place 7 All electrical conductors within 50 feet 15 2 m of the welder should be enclosed in grounded rigid metallic conduit or equivalent shielding Flexible helically wrapped metallic conduit is generally not suitable 8 When the welder is enclosed in a metal building several good earth driven electrical grounds as in 5 above around the periphery of the building are rec o
72. plays the Minimum control level setting on the Digital meter See Item 8 This knob sets the Start output level When the arc lights using a new built in TIG start pulse this level upslopes quickly 0 5 sec w Advanced Panel zero w o See UP Menu of Item 7a and smoothly to the weld output level The setting range for this Start control is the 2 amp minimum range of the machine up to about 50 amps but no more than the level set by the Maximum Output control knob See Item 6 but otherwise is independent of the Maximum set ting This setting also serves as the Crater fill level but with a Precision TIG Advanced Panel it can be selected see Section B 7 to be either the Minimum Output control setting same as Start setting as shipped or the minimum rating of the machine 2 amps The Remote Amptrol range of control is between this Minimum setting and the Maximum Output con trol knob setting so these knobs can set the resolu tion of the Amptrol Also the Minimum setting serves as both the minimum Amptrol start level when the arc start switch is closed as well as the minimum Amptrol crater fill level before the arc start Switch is opened to help prevent premature arc out and Hi Freq re initiation In STICK mode the Start control is not functional since Hot Start level is fixed or internal Advanced Panel adjustable see Section B 7 Pressing the Display momentary switch toggle left to Minimum Output position displays mini
73. plied to the welder CAUTION Failure to follow these instructions can cause immediate failure of components within the welder PRECISION TIG 375 LINCOLN P 5 INSTALLATION A 5 Welders are shipped connected for the highest input voltage as listed on the rating plate To change this connection designations on the reconnect panel LOW MID and HIGH correspond to the name plated input voltages of a triple voltage welder Dual voltage welders use only LOW and HIGH EXAMPLE On a 208 230 460 volt welder LOW is 208V MID is 230V and HIGH is 460V Note Export model has a voltage range for LOW and MID connections LOW is 220 230V MID is 380 400V and High is 415V Reconnect the jumper strap to the terminal stud corre sponding to the input voltage level used Make sure all connections are tight Fuse the input circuit with the recommended super lag fuses or delay typel circuit breakers Choose an input and grounding wire size according to local or national codes or use Section A 2 Using fuses or circuit break ers smaller than recommended may result in nui sance tripping from welder inrush currents even if not welding at high currents Unbalanced AC TIG welding draws higher input cur rents than those for Stick DC TIG or Balanced AC TIG welding The welder is designed for these higher input currents However where unbalanced AC TIG welding above 275 amps is planned the higher input currents require larger input wir
74. r Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed PRECISION TIG 375 LINCOLN 5 TROUBLESHOOTING E 5 Observe all Safety Guidelines detailed throughout this manual PROBLEMS POSSIBLE RECOMMENDED SYMPTOMS CAUSE COURSE OF ACTION PRESET amp OUTPUT CONTROL PROBLEMS Meter does not display preset 1 Faulty potentiometer R1 or its con nection 2 Bad connection at P9 of Control PC board Faulty Advanced Control PC board if present or its connection to the main Control PC board Missing plug P3 on Control board or bad connection at P3 when an Advanced Control PC board is not present High output current in both DC amp AC 1 Bad connection at P6 of Control polarities regardless of preset PC board Bad shunt connection Faulty Control PC board If all recommended possible areas Faulty SCR bridge of misadjustment have been checked and the problem persists High output current DC polarity 1 Shorted free wheeling diode D1 Contact your local Lincoln regardless of preset o k in AC polar Authorized Field Service Facility ity In 2 step Tig output stays on for 1 Bad 2 4 step switch or its connec more than downslope time after trig tion ger open machine with Advanced Control panel only Bad connection at P1 of Advanced Control PC board Output stays on after releasing 1 Downslope is not set at min hand foot Amptrol mac
75. r Under Storage unit the Foot Pedal or other remote control accessory and coiled control cable or excess cable length may be conveniently stored in the drawer while remaining connected PRECISION TIG 375 LINCOLN 8 INSTALLATION A 8 ROBOTIC INTERFACE CONNECTION Robotic interface can be made at the Remote Receptacle See Operation Section B 2 The machine is shipped with the remote receptacle circuit internally connected to receptacle J5 of the Control board for standard Amptrol operation In order to enable the remote receptacle for robotic interface its connection plug must be moved from J5 to J5A on the Control board Refer to the machine Wiring Diagram The robotic interface functions with the Precision TIG set to either TIG or STICK mode but must be in REMOTE switch position for the Preset Control inter face to function When in the REMOTE position with robotic interface neither the MAXIMUM OUTPUT nor the MINIMUM OUTPUT panel controls limit the inter face control setting over the rated output range of the machine The diagram in Figure A 4 below shows the remote receptacle plug connections and signals for robotic interface REMOTE RECEPTACLE Front View FIGURE A 4 For 18 12P Plug 1 lt i PRESET CONTROL I lt INPUT FROM ROBOT I 0 10Vdc Rated Output Range Note The Interface connection ARC START cable may pick up noise interference Additional bypass filt
76. r for Precision TIG connection PRECISION TIG 375 LINCOLN 7 INSTALLATION A 7 FIGURE A 3 Air Cooled Torch Torch Adapter Two Cable PTA 9 17 26 K2166 2 Opt ni p 7 8 14 T N CTRI AND One Cable K2166 1 Opt PTA 26 Pre 520403 4 Incl GAS CT gt E 5 8 18 RH AUXILIARY POWER CONNECTIONS The Precision TIG machines provide a standard NEMA 5 15R duplex receptacle located on the upper case back on the torch side of the machine The bottom outlet of this duplex receptacle provides switched 115VAC power for the Under Cooler or Water Solenoid accessory This Cooler receptacle turns on when the arc starts and remains on for about 8 minutes after the arc goes out with the Fan As Needed machine cooling fan see Maintenance Section so the Cooler s fan and water pump will not run continuously in idle but will run while welding The top outlet of this duplex receptacle provides at least 8 amps at 115VAC whenever the Precision TIG Power switch is ON This auxiliary circuit is intended for running 115VAC accessories or small power tools Note Some types of equipment especially pumps and large motors have starting currents which are significantly higher than their running current These higher starting currents may cause the circuit breaker to open See next paragraph Both the receptacle circuits are protected fr
77. rode dans l eau pour le refroidir Ne jamais toucher simultan ment les parties sous tension des porte lectrodes connect s deux machines souder parce que la tension entre les deux pinces peut tre le total de la tension vide des deux machines Si on utilise la machine souder comme une source de courant pour soudage semi automatique ces precautions pour le porte lectrode s applicuent aussi au pistolet de soudage 2 Dans le cas de travail au dessus du niveau du sol se prot ger contre les chutes dans le cas ou on recoit un choc Ne jamais enrouler le c ble lectrode autour de n importe quelle partie du corps Un coup d arc peut tre plus s v re qu un coup de soliel donc a Utiliser un bon masque avec un verre filtrant appropri ainsi qu un verre blanc afin de se prot ger les yeux du rayon nement de l arc et des projections quand on soude ou quand on regarde l arc b Porter des v tements convenables afin de prot ger la peau de soudeur et des aides contre le rayonnement de l arc c Prot ger l autre personnel travaillant proximit au soudage l aide d crans appropri s et non inflammables Des gouttes de laitier en fusion sont mises de l arc de soudage Se prot ger avec des v tements de protection libres de l huile tels que les gants en cuir chemise paisse pan talons sans revers et chaussures montantes Toujours porter des lunettes de s curit dans la zone de soudage Utili
78. ser des lunettes avec crans lateraux dans les zones l on pique le laitier 6 Eloigner les mat riaux inflammables ou les recouvrir afin de pr venir tout risque d incendie d aux tincelles Quand on ne soude pas poser la pince une endroit isol de la masse Un court circuit accidental peut provoquer un chauffement et un risque d incendie S assurer que la masse est connect e le plus pr s 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 loign s de la zone de travail on augmente le risque de voir passer le courant de soudage par les chaines de levage c bles de grue ou autres circuits Cela peut provoquer des risques d incendie ou d echauffement des chaines et des c bles jusqu ce qu ils se rompent Assurer une ventilation suffisante dans la zone de soudage Ceci est particuli rement important pour le soudage de t les galvanis es plomb es ou cadmi es ou tout autre m tal qui produit des fume s toxiques Ne pas souder en pr sence de vapeurs de chlore provenant d op rations de d graissage nettoyage ou pistolage La chaleur ou les rayons de l arc peuvent r agir avec les vapeurs du solvant pour produire du phosg ne gas fortement toxique ou autres produits irritants 11 Pour obtenir de plus amples renseignements sur la s ret voir le code Code for safety in welding and cutting CSA Standard W 117 2
79. sult of radiated interference Proper grounding methods can reduce or eliminate radiated interference The Precision TIG 375 has been field tested under rec ommended installation conditions and has been found to comply with F C C allowable radiation limits This welder has also been found to comply with NEMA stan dards for high frequency stabilized power sources Radiated interference can develop in the following four ways Direct interference radiated from the welder Direct interference radiated from the welding leads Direct interference radiated from feedback into the power lines e Interference from re radiation of pickup by ungrounded metallic objects Keeping these contributing factors in mind installing the equipment per the following instructions should minimize problems 1 Keep the welder power supply lines as short as pos sible Input leads within 50 feet 15 2 m of the welder should be enclosed in rigid metallic conduit or equivalent shielding There must be good electri cal contact between this conduit and the welder Both ends of the conduit must be connected to a driven ground and the entire length must be contin uous 2 Keep the work and electrode leads as short as pos sible and as close together as possible Lengths should not exceed 25 feet 7 6 m Tape the leads together when practical PRECISION TIG 375 LINCOLN 4 INSTALLATION 4 3 Be sure the torch and work cable rubber c
80. t of the electrode circuit is touching the work or ground Accidental contact can cause overheating and create a fire hazard 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 Hecommended 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 Vent hollow castings or containers before heating cutting or welding They may explode 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 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 Also see item 1 c Read and follow NFPA 51B Standar
81. towards the welder An abundance of conductive material can cause mainte nance problems STACKING The Precision TIG 375 s cannot be stacked UNDERCARRIAGE LIFTING AND MOVING When the Precision TIG 375 is purchased as a weld ing package or used with any of the available Undercarriage optional accessories proper installation makes the Precision TIG 375 lift bale nonfunctional Do not attempt to lift the power source with an under carriage attached The undercarriage is designed for hand moving only mechanized movement can lead to personal injury and or damage to the Precision TIG 375 TILTING Each machine must be placed on a secure level sur face either directly or on a recommended undercar riage The machine may topple over if this precaution is not followed ENVIRONMENTAL RATING Precision TIG 375 power sources carry an 1 215 Environmental rating They are rated for use in damp dirty rain sheltered environments MACHINE GROUNDING AND HIGH FRE QUENCY INTERFERENCE PROTECTION The frame of the welder must be grounded A ground screw marked with the symbol is located on the input connection panel Figure A 1 for this purpose See your local and nation al electrical codes for proper grounding methods The spark gap oscillator in the high frequency genera tor being similar to a radio transmitter can be blamed for many radio TV and electronic equipment interfer ence problems These problems may be the re
82. und connection of Bypass f all recommended possible areas Stabilizer PC board may has of misadjustment have been become loose checked and the problem persists Contact your local Lincoln Authorized Field Service Facility CAUTION Iffor 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 PRECISION TIG 375 LINCOLN amp LL WIRING DIAGRAM epoo 1ueuudinbe 5 jueujeoe doi 10 IUM sjieued Jo euo uo y episul si epoo 104 oyioeds siy Aq 10 e1eunooe eq jou y 76959 VINVINN DA nzv ames DEN via MON sun au S318V9 5340109 091009 53180 saq aq 3000 4009 9NI40109 VAT ONNIE VIONGTOG VLIY BOGVWHOJSNYML 310 VH NI3 LVINIOJSNVHLL 28513 V 3WHOJNOO 50016103713 SOTOBNIS 1913 NOTAS 530110319 STIOENAS VINON 18813 Had SIOBNAS WILONA YOLD3NOD HQ VISIA ID HNS SHNALDINNOD 520 IN
83. wer Gas are electrically hot while welding in STICK or TIG modes If using an Air Cooled Torch be sure coolant is shut off and or Cooler is unplugged from the Precision TIG Water Cooler Receptacle on the torch side of the upper case back Observe the safety precautions necessary for han dling and using compressed gas containers Contact your supplier for specifics CABLE STRAIN RELIEF HOLES CYLINDER could explode ZZ XEM 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 cir cuits Maximum inlet pressure 150 psi The Precision TIG machines do not have Hi Freq available at the Stick electrode stud therefore stud connection adapters such as S19257 series cannot be used for torch connection Single piece cable air cooled torches with a 3 8 24 RH connector fitting such as the Magnum PTA 9 17 or LA 9 17 require the provided S20403 4 Torch Connector while those with a 7 8 14 RH connector fitting such as the Magnum PTA 26 or LA 26 require the available K2166 1 Torch Connector See Figure A 3 Two piece cable air cooled torches such as PTA or LA torches can be used with the available K2166 2 1 2 Stud Connector with with a 7 8 14 LH male fitting Magnum PTW 18 20 or LW water cooled Torches require no adapte
84. where to depress the Amptrol to start the arc reliably the Minimum Output control allows presetting the exact level so reliable starts as well as minimum crater fill levels can be consistently obtained at the minimum Amptrol inac tivated state FIGURE B 6 shows Precision TIG setup for TIG welding with an Amptrol PRECISION TIG 375 LINCOLN 12 OPERATION FIGURE B 6 Setup for TIG Amptrol Welding Standard Controls Power Switch ON I Mode Switch TIG I AC Balance Polarity Switch AUTO AC or DC or Set More for alum oxide Cleaning wlo Spitting or wetting loss Balanced for equal and current More for higher Penetration Max to Min Amptrol Local Remote Switch REMOTE Maximum Output Set to desired max Amptrol output level Minimum Output Press Display switch and Set to desired min Amptrol Start Crater level EN Set as low as required Higher for larger tungsten and current Advanced Panel Trigger Switch 2 STEP Pulse Frequency 4 6 pps is a typical initial setting Set for bead shape and travel speed Higher for thinner plate and faster travel Lower for thicker plate and slower travel Pulse Switch ON or OFF On Time 40 60 is a typical initial setting Set for total heat of Peak current Lower reduces distortion and burn

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