PRECISION TIG 375OPERATOR’S MANUALIM909November, 2006Safety Depends on YouLincoln arc welding and cuttingequipment is designed and builtwith safety i

A-1INSTALLATION PRECISION TIG 375A-1TECHNICAL SPECIFICATIONS-PRECISION TIG 375 (K1834-3 Export-50/60Hz)Max. Amps With Power Factor Capacitor119/69/6

A-2INSTALLATION PRECISION TIG 375A-2ADDITIONAL OUTPUT CAPACITYOutput Current Range2Amps DCto420Amps AC-DC*Type of OutputCC (Constant Current)AC/DC (

A-3INSTALLATION PRECISION TIG 375A-3SAFETY PRECAUTIONSSELECT SUITABLE LOCATIONPlace the welder where clean cooling air can freely cir-culate in thro

INPUT and GROUNDING CONNECTIONSBe sure the voltage, phase, and frequency of the inputpower is as specified on the rating plate, located on therear of

A-5INSTALLATION PRECISION TIG 375A-5Recommended Cable Sizes for Combined Lengths ofCopper Work and Electrode Cables using 75oC Wire:Machine Rating 0

A-6INSTALLATION PRECISION TIG 375A-6TIG TORCH CONNECTIONThe Precision TIG torch connection box, located on theright side of the machine, provides al

A-7INSTALLATION PRECISION TIG 375A-7AUXILIARY POWER CONNECTIONSThe Precision TIG machines provide a standard NEMA5-15R duplex receptacle, located on

A-8INSTALLATION PRECISION TIG 375A-8ROBOTIC INTERFACE CONNECTIONRobotic interface can be made at the RemoteReceptacle (See Operation Section B-2). T

B-1OPERATIONB-1PRODUCT DESCRIPTIONThe Precision TIG 375 is part of a new family of indus-trial arc welding power sources providing constant cur-rent,

B-2OPERATIONB-2RECOMMENDED PROCESSES ANDEQUIPMENTRECOMMENDED PROCESSESThe Precision TIG 375 is recommended for the TIG(GTAW) and Stick (SMAW) welding

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

B-3OPERATIONB-31. POWER SWITCH - Input line switch turns inputpower ON or OFF, as indicated by the on or off sta-tus of the front panel displays.2. PO

B-4OPERATIONB-4• When the Polarity Switch is set to DC (- or +), theTIG mode provides high frequency only for starting.Hi-Freq. turns on after pre-fl

B-5OPERATIONB-58. DIGITAL METER AND DISPLAY SWITCH– A3-digit LED meter is used to monitor the preset andactual welding procedure based on the Displa

B-6OPERATIONB-6• In 4-Step position allows welding without continu-ously holding the start switch trigger. The arc startswitch functions in the follo

B-7OPERATIONB-7INTERNAL SET UP CONTROLSPrecision TIG 375 Advanced Panel has the followingadditional control features which are set up using theDIP Swi

B-8OPERATIONB-8PRECISION TIG 375(With DIP Switch #2 ON, As Shipped)(With DIP Switch #2 OFF)FIGURE B.3

B-9OPERATIONB-9PRECISION TIG 375FIGURE B.4(With DIP Switch #3 OFF, As Shipped)(With DIP Switch #3 ON)

B-10OPERATIONB-10SETUP GUIDELINES FOR TIG WELDINGWITH AN AMPTROLBoth the Hand and Foot Amptrols work in a similarmanner. They are meant to be used for

B-11OPERATIONB-11PRECISION TIG 375Max. to Min.AmptrolMin. to Max.AmptrolSetup for TIG Amptrol WeldingAdvanced Panel(If used)Standard ControlsPower Swi

B-12OPERATIONB-12PRECISION TIG 375RECOMMENDED ELECTRODE AMPERAGE RANGES - Precision TIG 375SMAW ProcessELECTRODE POLARITY 3/32" 1/8" 5/32&q

iiSAFETYiiARC RAYS can burn.4.a. Use a shield with the proper filter and coverplates to protect your eyes from sparks andthe rays of the arc when weld

C-1ACCESSORIESC-1OPTIONAL EQUIPMENTFACTORY INSTALLED OPTIONSThe basic Precision TIG 375 machine is factoryequipped with:• K1829-1 Precision TIG Advanc

D-1MAINTENANCED-1PRECISION TIG 375ELECTRIC SHOCK can kill.• Only qualified personnel shouldperform this maintenance.• Turn the input power OFF at thed

D-2MAINTENANCED-2SERVICE PROCEDURESOperation of the Precision TIG should be trouble-freefor the life of the machine. Should a malfunction occur,howev

DO NOT use a volt-ohm meter to measure output voltages in TIG mode. TheHigh Frequency Arc Starter voltage can damage the meter.CAUTIONE-1TROUBLESHOOTI

E-2TROUBLESHOOTINGE-2PRECISION TIG 375Observe all Safety Guidelines detailed throughout this manualIf for any reason you do not understand the test pr

E-3TROUBLESHOOTINGE-3PRECISION TIG 375Observe all Safety Guidelines detailed throughout this manualIf for any reason you do not understand the test pr

E-4TROUBLESHOOTINGE-4PRECISION TIG 375Observe all Safety Guidelines detailed throughout this manualIf for any reason you do not understand the test pr

E-5TROUBLESHOOTINGE-5PRECISION TIG 375Observe all Safety Guidelines detailed throughout this manualIf for any reason you do not understand the test pr

E-6TROUBLESHOOTINGE-6PRECISION TIG 375Observe all Safety Guidelines detailed throughout this manualIf for any reason you do not understand the test pr

E-7TROUBLESHOOTINGE-7PRECISION TIG 375Observe all Safety Guidelines detailed throughout this manualIf for any reason you do not understand the test pr

FOR ELECTRICALLYpowered equipment.8.a. Turn off input power using the disconnectswitch at the fuse box before working onthe equipment.8.b. Install equ

F-1WIRING DIAGRAMF-1PRECISION TIG 375NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The

F-2DIMENSION PRINTF-2PRECISION TIG 375L11660XB-UF** LOCATION OF (4) O.284 BASE MOUNTING HOLES.12.7731.0026.001.00 24.00 **.283.4720.50 **22.00.30.753

NOTES

NOTES

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ivSAFETYivPRÉCAUTIONS DE SÛRETÉPour votre propre protection lire et observer toutes les instructionset les précautions de sûreté specifiques qui parra

vSAFETYv

viSAFETYvi

viiviiThank Youfor selecting a QUALITY product by Lincoln Electric. We want youto take pride in operating this Lincoln Electric Company product •••as

TABLE OF CONTENTSPage.Installation ..........................Section