Page 2 - SAFETY; PERFORMED ONLY BY QUALIFIED INDIVIDUALS.; WARNING; ELECTRIC AND; CALIFORNIA PROPOSITION 65 WARNINGS
FOR ENGINEpowered equipment. 1.a. Turn the engine off before troubleshooting and maintenance work unless the maintenance work requires it to be running. ____________________________________________________ 1.b. Operate engines in open, well-ventilated areas or vent the engine exhaust fumes outdoors....
Page 3 - ii; ELECTRIC SHOCK can kill.
ii SAFETY ii 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 Z87. I standards. 4.b. Use suitable clothing made from dura...
Page 4 - CYLINDER may explode; iii
FOR ELECTRICALLYpowered equipment. 8.a. Turn off input power using the disconnect switch at the fuse box before working on the equipment. 8.b. Install equipment in accordance with the U.S. National Electrical Code, all local codes and the manufacturer’s recommendations. 8.c. Ground the equipment in ...
Page 5 - iv; PRÉCAUTIONS DE SÛRETÉ; PRÉCAUTIONS DE SÛRETÉ POUR
iv SAFETY iv 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 seco...
Page 6 - Please Examine Carton and Equipment For Damage Immediately
v v TThhaannkk Y Yoouu for selecting a QUALITY product by Lincoln Electric. We want you to take pride in operating this Lincoln Electric Company product ••• as much pride as we have in bringing this product to you! Read this Operators Manual completely before attempting to use this equipment. Save t...
Page 7 - TABLE OF CONTENTS
TABLE OF CONTENTS Page . Installation ..........................................................................................................Section A Technical Specifications ........................................................................................A-1,A-2 Safety Precautions .. ......
Page 8 - INSTALLATION; Max. Amps With Power Factor Capacitor; RATED INPUT - SINGLE PHASE ONLY; Amps DC
A-1 INSTALLATION PRECISION TIG 375 A-1 TECHNICAL SPECIFICATIONS-PRECISION TIG 375 (K2623-1 Export-50/60Hz) Voltage + 10% 220-230/ 380-400/415 Max. Amps With Power Factor Capacitor 119/69/63 118/68/62 110/64/59 97/56/52 88/51/47 73/42/39 48/28/25 .67 min. .8KW Duty Cycle-Applications 40% AC/DC Stick ...
Page 9 - PHYSICAL DIMENSIONS; TEMPERATURE RANGES
A-2 INSTALLATION PRECISION TIG 375 A-2 Height Width Depth Weight 31.0 in. 22.0 in. 26.0 in. 507 lbs. 787 mm 559 mm 660 mm 230 kgs. PHYSICAL DIMENSIONS 1 ALSO CALLED ‘INVERSE TIME" OR "THERMAL/MAGNETIC " CIRCUIT BREAKERS; CIRCUIT BREAKERS WHICH HAVE A DELAY IN TRIPPING ACTION THAT DECREAS...
Page 10 - SAFETY PRECAUTIONS; GRINDING
A-3 INSTALLATION PRECISION TIG 375 A-3 SAFETY PRECAUTIONS 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 ...
Page 11 - INPUT and GROUNDING CONNECTIONS
INPUT and GROUNDING CONNECTIONS 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 p...
Page 12 - WORK CABLE CONNECTION
A-5 INSTALLATION PRECISION TIG 375 A-5 Recommended Cable Sizes for Combined Lengths of Copper Work and Electrode Cables using 75 o C Wire: Machine Rating 0 to 100 Ft . 101 to 200 Ft 201 to 250 Ft 375A/40% #1 (42.4 mm2) 1/0 (53.5 mm2) 2/0 (67.4 mm2) WORK CABLE CONNECTION A 15’ (2/0) weld cable with c...
Page 13 - TIG TORCH CONNECTION
A-6 INSTALLATION PRECISION TIG 375 A-6 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 G...
Page 14 - For Gas Supply; For Gas Supply; Export models
Torch Adapter Air Cooled Torch OUTPUT (front) Panel ELECTODE AND/OR GAS OUTPUT 5/8-18 RH ELECTODE AND COOLANT IN 7/8-14 LH COOLANT OUT 5/8-18 LH ELECTODE AND/OR GAS OUTPUT 5/8-18 RH INPUT (back) Panel Two - Cable(PTA-9,-7,-26) One - Cable (PTA-26) One - Cable (PTA-9,-17) K2166-2 (Opt.) K2166-1 (Opt....
Page 15 - ROBOTIC INTERFACE CONNECTION
A-8 INSTALLATION PRECISION TIG 375 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....
Page 16 - OPERATION; PRODUCT DESCRIPTION; PIPE THAWING
B-1 OPERATION B-1 PRODUCT DESCRIPTION The Precision TIG 375 is part of a family of industrial arc welding power sources providing constant current, single range square wave AC/DC TIG (GTAW) with patented MicroStart™ II Technology, Presettable Min. and Max. Output controls, and built-in high frequenc...
Page 17 - RECOMMENDED PROCESSES AND; RECOMMENDED PROCESSES
B-2 OPERATION B-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 (re...
Page 18 - CONTROLS AND SETTINGS
B-3 OPERATION B-3 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 polarit...
Page 19 - AC BALANCE CONTROL; MINIMUM OUTPUT CONTROL AND DISPLAY SWITCH
B-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 DC+ polarity to permit "balling...
Page 20 - DIGITAL DISPLAY; SELECT; SET; enters; exit
B-5 OPERATION B-5 PRECISION TIG 375 DIGITAL DISPLAY DIGITAL DISPLAY SELECT SELECT DISPLAY DISPLAY SET SET DISPLAY DISPLAY 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 param...
Page 21 - ADVANCED PANEL CONTROLS; CAUTION
B-6 OPERATION B-6 PRECISION TIG 375 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 (normal) position, the digital meter displays t...
Page 23 - INTERNAL SET UP CONTROLS
B-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 co...
Page 26 - SETUP GUIDELINES FOR TIG WELDING; TIG WELD CYCLE CHART
B-11 OPERATION B-11 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 ...
Page 28 - RECOMMENDED ELECTRODE AMPERAGE RANGES - Precision TIG 375; SMAW Process; GTAW Process; MAKING A TIG WELD WITH AN AMPTROL
B-13 OPERATION B-13 PRECISION TIG 375 RECOMMENDED ELECTRODE AMPERAGE RANGES - Precision TIG 375 SMAW Process ELECTRODE POLARITY 3/32" 1/8" 5/32" Fleetweld 5P, Fleetweld 5P+ DC+ 40 - 70 75 - 130 90 - 175 Fleetweld 180 DC+ 40 - 80 55 - 110 105 - 135 Fleetweld 37 DC+ 70 - 95 100 - 135 145 -...
Page 29 - ACCESSORIES; OPTIONAL EQUIPMENT; FACTORY INSTALLED OPTIONS
C-1 ACCESSORIES C-1 OPTIONAL EQUIPMENT FACTORY INSTALLED OPTIONS The basic Precision TIG 375 machine is factory equipped with: • K2621-1 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 Ho...
Page 30 - MAINTENANCE; OVERLOAD PROTECTION
D-1 MAINTENANCE D-1 PRECISION TIG 375 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. To avoid receiving a high frequency shoc...
Page 31 - SERVICE PROCEDURES
D-2 MAINTENANCE D-2 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...
Page 32 - DO NOT; TROUBLESHOOTING; Local; Step 3. RECOMMENDED COURSE OF ACTION; HOW TO USE TROUBLESHOOTING GUIDE
DO NOT use a volt-ohm meter to measure output voltages in TIG mode. The High Frequency Arc Starter voltage can damage the meter. CAUTION E-1 TROUBLESHOOTING E-1 PRECISION TIG 375 If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact yo...
Page 33 - OUTPUT PROBLEMS
E-2 TROUBLESHOOTING E-2 PRECISION TIG 375 Observe all Safety Guidelines detailed throughout this manual 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 troublesho...
Page 34 - METER PROBLEMS
E-3 TROUBLESHOOTING E-3 PRECISION TIG 375 Observe all Safety Guidelines detailed throughout this manual 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 troublesho...
Page 35 - PROBLEMS
E-4 TROUBLESHOOTING E-4 PRECISION TIG 375 Observe all Safety Guidelines detailed throughout this manual 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 troublesho...
Page 36 - PRESET & OUTPUT CONTROL PROBLEMS
E-5 TROUBLESHOOTING E-5 PRECISION TIG 375 Observe all Safety Guidelines detailed throughout this manual 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 troublesho...
Page 37 - STICK WELDING PROBLEMS
E-6 TROUBLESHOOTING E-6 PRECISION TIG 375 Observe all Safety Guidelines detailed throughout this manual 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 troublesho...
Page 38 - TIG PROBLEMS
E-7 TROUBLESHOOTING E-7 PRECISION TIG 375 Observe all Safety Guidelines detailed throughout this manual 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 troublesho...
Page 39 - WIRING DIAGRAM
F-1 WIRING DIAGRAM F-1 PRECISION TIG 375 C A B B 1 0K A -B F E D C M IN IM UM D F A E A B C D E F 319 322 316C 313C 316B 315 316 317 311 312 313 318 31 3A 31 3B 8 4 1 2 3 6 5 6 321 12 11 10 9 8 6 5 4 3 1 2 6 5 4 3 2 1 2 3 4 5 7 1 314 320 311A 316A 8 7 6 5 4 3 2 1 J2 3 J2 2 7 316C 32 1 32 2 31 3 31 4...
Page 40 - DIMENSION PRINT
F-2 DIMENSION PRINT F-2 PRECISION TIG 375 L 1 1 6 6 0 X B -U F ** L O C A T IO N O F ( 4) O .2 84 B A S E M O U N T IN G H O LE S . 12 .7 7 31 .0 0 26 .0 0 1. 00 24 .0 0 ** .2 8 3. 47 20 .5 0 ** 22 .0 0 .3 0 .7 5 3. 44 T O R C H H O LS T E R 2. 11 T O R C H B O X 11 .0 0 2. 98
Page 41 - NOTES