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PRECISION TIG 375
For use with machines having Code Numbers:
Safety Depends on You
Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However, your
overall safety can be increased by
proper installation ... and thoughtful
operation on your part. DO NOT
INSTALL, OPERATE OR REPAIR
THIS
EQUIPMENT
WITHOUT
READING THIS MANUAL AND
THE SAFETY PRECAUTIONS
CONTAINED
THROUGHOUT.
And, most importantly, think before
you act and be careful.
• 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
RETURN TO MAIN MENU
10809; 10810; 10894
IP21S
OPERATOR'S MANUAL
• World's Leader in Welding and Cutting Products •
Precision TIG 375 Welding
Package shown with optional
Advanced Control Panel
Copyright © 2004 Lincoln Global Inc.
IM703-A
November, 2004
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Summary of Contents for Lincoln Electric PRECISION TIG 375 IM703-A
- Page 1 PRECISION TIG 375 For use with machines having Code Numbers: Safety Depends on You Lincoln arc welding and cutting equipment is designed and built with safety in mind. However, your overall safety can be increased by proper installation ... and thoughtful operation on your part.
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Page 2: California Proposition 65 Warnings
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. -
Page 3: Electric Shock Can Kill
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. - Page 4 WELDING SPARKS can cause fire or explosion. 6.a. Remove fire hazards from the welding area. If this is not possible, cover them to prevent the welding sparks from starting a fire. Remember that welding sparks and hot materials from welding can easily go through small cracks and openings to adjacent areas.
- Page 5 PRÉCAUTIONS DE SÛRETÉ Pour votre propre protection lire et observer toutes les instructions et les précautions de sûreté specifiques qui parraissent dans ce manuel aussi bien que les précautions de sûreté générales suiv- antes: Sûreté Pour Soudage A L’Arc 1. Protegez-vous contre la secousse électrique: a.
- Page 6 The code number is especially important when identifying the correct replacement parts. - 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.
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Page 7: Table Of Contents
Installation ...Section A Technical Specifications ...A-1,A-2 Safety Precautions ..Select Suitable Location ...A-3 Grinding ...A-3 Stacking ...A-3 Undercarriage Lifting and Moving ...A-3 Tilting ...A-3 Environmental Rating ...A-3 Machine Grounding and High F Input and Grounding Connections ...A-4 Output Cable, Connections and Limitations ...A-5 Work Cable Connection ...A-5 Stick Electrode Cable Connection ...A-5 TIG Torch Connection ...A-6... -
Page 8: Installation
TECHNICAL SPECIFICATIONS-PRECISION TIG 375 (K1903-1 Domestic Package*-60Hz) (K1833-1 Domestic,K1833-2 Canadian-60Hz) (K1834-1 Export-50/60Hz) RATED INPUT - SINGLE PHASE ONLY Duty Cycle-Applications Number AC/DC Stick / Balance TIG Unbalance (70% Penetration K1833-1 K1903-1 AC/DC Stick / Balance TIG Unbalance (70% Penetration 100% AC/DC Stick / Balance TIG Unbalance (70% Penetration NRTL/C... -
Page 9: Physical Dimensions
RATED OUTPUT - IEC 60974-1 (K1834-1) Duty Cycle-Applications AC/DC Stick / Balance TIG Unbalance (70% Penetration ) AC TIG AC/DC Stick / Balance TIG Unbalance (70% Penetration ) AC TIG 100% AC/DC Stick / Balance TIG Unbalance (70% Penetration ) AC TIG Output Current Maximum Open Range... -
Page 10: Safety Precautions
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. •... -
Page 11: Input And Grounding Connections
3. Be sure the torch and work cable rubber coverings 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. -
Page 12: Output Cable, Connections And Limitations
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. -
Page 13: Tig Torch Connection
REMOTE CONTROL RECEPTACLE STICK ELECTRODE STUD 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... -
Page 14: Auxiliary Power Connections
FIGURE A.3 1/2-13 Stud 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. -
Page 15: Robotic Interface Connection
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. -
Page 16: Peration
SAFETY PRECAUTIONS Read and understand this entire section before operat- ing the machine. WARNING 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. -
Page 17: Recommended Processes And Equipment
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 accessories (refer... -
Page 18: Controls And Settings
CONTROLS AND SETTINGS 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: 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. - Page 19 • 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* •...
- Page 20 8. DIGITAL METER AND DISPLAY SWITCH– A 3- digit LED meter is used to monitor the preset and actual welding procedure based on the Display (momentary) switch position: • Before welding with Display switch in center (nor- mal) position, the digital meter displays the preset welding amps set by Maximum Output control knob (See Item 6).
- Page 21 • In 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.
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Page 22: Internal Set Up Controls
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-... - Page 23 OPERATION FIGURE B.3 (With DIP Switch #2 OFF) (With DIP Switch #2 ON, As Shipped) PRECISION TIG 375...
- Page 24 OPERATION FIGURE B.4 (With DIP Switch #3 ON) (With DIP Switch #3 OFF, As Shipped) PRECISION TIG 375...
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Page 25: Setup Guidelines For Tig Welding With An Amptrol
B-10 TIG WELD CYCLE CHART 2 or 4-STEP 4-STEP Trigger Trigger Closed Open SEE ITEM 12 SEE ITEM 12 MAXIMUM OUTPUT SETTING Adjustable 2-Max.A SEE ITEM 6 Amptrol or Remote (PEAK) Range SEE ITEM 6 & 7 MINIMUM OUTPUT (Start) SETTING Adjustable 2-50A SEE ITEM 7 PREFLOW... - Page 26 B-11 The new foot pedal provides such independent action distinction of precisely where the arc start switch actu- ates without over-riding minimum control pedal posi- tion, and precisely where the control pedal has been returned to minimum position without inadvertently de- actuating the arc start switch.
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Page 27: Making A Tig Weld With An Amptrol
B-12 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 Fan-As-Needed machine... -
Page 28: Accessories
OPTIONAL EQUIPMENT FACTORY INSTALLED OPTIONS The basic Precision TIG 375 machine is factory equipped with: • K1829-1 Precision TIG Advanced Control Panel. Provides 2/4-step trigger with adjustable Pulser 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. -
Page 29: Maintenance
SAFETY PRECAUTIONS WARNING ELECTRIC SHOCK can kill. • Only qualified personnel should perform this maintenance. • Turn the input power OFF at the disconnect switch or fuse box before working on this equipment. • Do not touch electrically hot parts. WARNING To avoid receiving a high frequency shock, keep the TIG torch and cables in good condition. -
Page 30: Under-Cooler Service
SERVICE PROCEDURES Operation of the Precision TIG should be trouble-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:... -
Page 31: Troubleshooting
HOW TO USE TROUBLESHOOTING GUIDE Service and Repair should only be performed by Lincoln Electric Factory Trained Personnel. Unauthorized repairs performed on this equipment may result in danger to the technician and machine operator and will invalidate your factory warranty. For your safety and to avoid Electrical Shock, please observe all safety notes and precautions detailed throughout this manual. -
Page 32: Troubleshooting
Observe all Safety Guidelines detailed throughout this manual PROBLEMS (SYMPTOMS) Thermal light comes on Meter doesn’t light up Has output in No gas & no hi-freq Stick mode but no output in Tig mode Gas & hi-freq are o.k. No output in both Stick and Tig modes 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. - Page 33 Observe all Safety Guidelines detailed throughout this manual PROBLEMS (SYMPTOMS) Meter does not light up Meter does not display V (Volt) or Min A (Minimum current) No gas No control on post flow time Pre flow & Post flow time too long 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.
- Page 34 Observe all Safety Guidelines detailed throughout this manual PROBLEMS (SYMPTOMS) No hi-freq Hi-freq intensity too weak Hi-freq on continuously in DC Tig Hi-freq shuts off after starting in AC 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.
- Page 35 Observe all Safety Guidelines detailed throughout this manual PROBLEMS (SYMPTOMS) PRESET & OUTPUT CONTROL PROBLEMS Meter does not display preset High output current in both DC & AC polarities regardless of preset High output current in DC polarity regardless of preset, o.k. in AC polar- In 2-step Tig, output stays on for more than downslope time after trig- ger open (machine with Advanced...
- Page 36 Observe all Safety Guidelines detailed throughout this manual PROBLEMS (SYMPTOMS) 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 & AC polari- ties 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.
- Page 37 Observe all Safety Guidelines detailed throughout this manual PROBLEMS (SYMPTOMS) Arc "pulsates" in AC polarity, DC polarity is o.k. Black area along weld bead Output quits momentarily; gas flow and hi-freq are also interrupted 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.
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Page 38: Diagrams
304B 316B 316C 316C WIRING DIAGRAM 233A 401D 316A 311A 401D 313C 401B PRECISION TIG 375 ENHANCED DIAGRAMS 231A 233A 238A 231E 231F 260A 231C OPTION 401A... - Page 39 304B 316B 316C 313C 316C WIRING DIAGRAM 233A 231C OPTION 401D 316A 311A 401D 401A 401B PRECISION TIG 375 ENHANCED DIAGRAMS 231A 233A 238A 231E 231F 260A...
- Page 40 304B 316B 316C 316C WIRING DIAGRAM 233A 401D 316A 311A 401D 313C 401B PRECISION TIG 375 ENHANCED DIAGRAMS 231A 233A 238A 231E 231F 260A 231C OPTION 401A...
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Page 41: Dimension Prints
DIMENSION PRINT PRECISION TIG 375... - Page 42 DIMENSION PRINT PRECISION TIG 375...
- Page 43 NOTES PRECISION TIG 375...
- Page 44 WARNING Spanish AVISO DE PRECAUCION French ATTENTION German WARNUNG Portuguese ATENÇÃO Japanese Chinese Korean Arabic...
- Page 45 Spanish PRECAUCION French ATTENTION German WARNUNG Portuguese Japanese Chinese Korean Arabic WARNING AVISO DE ATENÇÃO...
- Page 46 • 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...