Lincoln Electric SVM141-A - Manual

Lincoln Electric SVM141-A

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Table of Contents:

  • Page 2 – SAFETY; WARNING; CALIFORNIA PROPOSITION 65 WARNINGS; The Above For Diesel Engines
  • Page 3 – ii; ELECTRIC SHOCK can kill.
  • Page 4 – iii
  • Page 5 – iv; PRÉCAUTIONS DE SÛRETÉ
  • Page 6 – MASTER TABLE OF CONTENTS FOR ALL SECTIONS; Page; RETURN TO MAIN INDEX
  • Page 7 – TABLE OF CONTENTS; Installation
  • Page 8 – INSTALLATION; TECHNICAL SPECIFICATIONS - Square Wave TIG 275; For all Stick, DC TIG and Balanced AC TIG; INPUT - SINGLE PHASE ONLY; Power; PHYSICAL DIMENSIONS
  • Page 9 – SAFETY PRECAUTIONS; The frame of the welder must be grounded.
  • Page 10 – INPUT SUPPLY CONNECTIONS; Connect the terminal marked (at the base of the
  • Page 11 – circuit breakers. Choose an input; Technical Specifications page at; INPUT RECONNECT PROCEDURE; S I N G L E
  • Page 12 – WORK CABLE CONNECTION; Cable Sizes for Combined Lengths of Copper
  • Page 13 – TIG TORCH CONNECTION
  • Page 15 – Examine the strain relief boot and TIG adapter for; Work Cable
  • Page 16 – NOTES
  • Page 17 – Operation
  • Page 18 – OPERATION
  • Page 19 – GENERAL DESCRIPTION
  • Page 20 – WELDING CAPABILITY
  • Page 21 – Trimmer Potentiometers - Allows the meters to be; calibrated in the field.; Digital Ammeter - The ammeter displays actual; CONTROLS AND SETTINGS
  • Page 22 – Maintenance Section for more; WELDING OPERATION; TIG WELDING; TABLE B.1 TYPICAL CURRENT RANGES FOR TUNGSTEN ELECTRODES
  • Page 23 – RECOMMENDED POLARITY
  • Page 24 – Hold the Arc Start Switch down until an arc is; HAND AND FOOT AMPTROL OPERATION; ADVANCED TIG WELDING FEATURES; AC WAVE BALANCE AND AUTO BALANCETM
  • Page 25 – 0 HERTZ DOMESTIC MACHINES
  • Page 27 – Accessories
  • Page 28 – OPTIONAL ACCESSORIES; K814 - Arc Start Switch; Cooler Mounting Bracket; K1622-3 - Twist Mate Adapter Kit for LA26 Torch; Lead; ACCESSORIES
  • Page 29 – Maintenance
  • Page 30 – • Only qualified personnel should per-; OVERLOAD PROTECTION; MAINTENANCE
  • Page 31 – SPARK GAP ADJUSTMENT; RIGHT SIDE VIEW OF MACHINE
  • Page 33 – Theory of Operation; FIGURE E.1 - SQUARE WAVE TIG 275 BLOCK LOGIC DIAGRAM
  • Page 34 – THEORY OF OPERATION; FIGURE E.2 – MAIN TRANSFORMER AND INPUT POWER
  • Page 35 – SCR; FIGURE E.3 – OUTPUT RECTIFICATION, CONTROL BOARD AND FEEDBACK
  • Page 36 – FIGURE E.4 – HIGH VOLTAGE / HIGH FREQUENCY CIRCUIT
  • Page 37 – FIGURE E.5 – DC WELDING OUTPUT; DC WELDING OUTPUT; CHOKE
  • Page 38 – AC WELDING OUTPUT; FIGURE E.7 – AC WELDING OUTPUT
  • Page 39 – SCR OPERATION; FIGURE E.9 – SCR OPERATION
  • Page 40 – PROTECTIVE CIRCUITS; THERMAL PROTECTION
  • Page 41 – Test Procedures
  • Page 42 – HOW TO USE TROUBLESHOOTING GUIDE; TROUBLESHOOTING & REPAIR; CAUTION; The
  • Page 43 – PC BOARD TROUBLESHOOTING PROCEDURES
  • Page 44 – Observe Safety Guidelines; TROUBLESHOOTING GUIDE; detailed in the beginning of this manual.; OUTPUT PROBLEMS; Reconnect; Make sure the input power; T1 Transformer
  • Page 45 – Make sure the polarity switch is; Check the current control R1 for
  • Page 47 – Check the electrode cable and; Check the current control for
  • Page 48 – Check the current control for
  • Page 49 – Check and replace if necessary.
  • Page 50 – TIG WELDING PROBLEMS
  • Page 51 – If the machine is in a highly dirty; Replace if defective.
  • Page 52 – The spark gap may be too; If helium shielding gas is being
  • Page 53 – Technical Specifications in the
  • Page 54 – STICK WELDING PROBLEMS
  • Page 55 – FUNCTION PROBLEMS; The displays will read “000” until
  • Page 56 – One of the display meters is blank.
  • Page 57 – The AC wave balance control is
  • Page 58 – HIGH FREQUENCY CIRCUIT DISABLE PROCEDURE; TEST DESCRIPTION; This procedure takes approximately 8 minutes to perform.; HIGH VOLTAGE IS STILL PRESENT IN THE HIGH FREQUENCY CIRCUIT.
  • Page 59 – FIGURE F.1 – SPARK GAP ASSEMBLY; PROCEDURE
  • Page 60 – This procedure takes approximately 15 minutes to perform.
  • Page 61 – T1 MAIN TRANSFORMER TEST; FIGURE F.2 – PLUG J8 LOCATION ON CONTROL BOARD; TEST PROCEDURE; Remove main supply power to the machine.
  • Page 62 – If all of the secondary voltages are correct, the; Main
  • Page 63 – T1 TRANSFORMER VOLTAGES; TO
  • Page 64 – This procedure takes approximately 10 minutes to perform.
  • Page 65 – FIGURE F.3 – GAS SOLENOID LOCATION; High Frequency Circuit
  • Page 66 – This procedure takes approximately 12 minutes to perform.
  • Page 67 – STATIC SCR TEST; FIGURE F.4 – PLUG J1 LOCATION ON CONTROL BOARD; Remove main supply power to the TIG 275
  • Page 68 – SCR Bridge
  • Page 69 – DESCRIPTION; This procedure takes approximately 20 minutes to perform.
  • Page 70 – ACTIVE SCR TEST; FIGURE F.6 – PLUG J1 LOCATION ON CONTROL BOARD
  • Page 71 – FIGURE F.7 – ACTIVE SCR TEST SETUP
  • Page 72 – FIGURE F.8 – SCR GATE LOCATIONS
  • Page 73 – SCOPE SETTINGS; NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM; AC TIG MODE
  • Page 74 – DC TIG MODE
  • Page 75 – AC STICK MODE
  • Page 76 – DC STICK MODE
  • Page 77 – TYPICAL OUTPUT VOLTAGE WAVEFORM - MACHINE LOADED
  • Page 82 – This procedure takes approximately 25 minutes to perform.
  • Page 83 – HIGH VOLTAGE TRANSFORMER REMOVAL; FIGURE F.9 – SECONDARY LEADS AT HIGH FREQUENCY STARTER BOARD; REMOVAL PROCEDURE
  • Page 84 – FIGURE F.10 – HIGH VOLTAGE TRANSFORMER MOUNTING INSULATORS; REPLACEMENT PROCEDURE
  • Page 85 – This procedure takes approximately 40 minutes to perform.
  • Page 86 – SCR BRIDGE ASSEMBLY REMOVAL AND REPLACEMENT; FIGURE F.11 – RECEPTACLE/CIRCUIT BREAKER LEADS; Remove input power to the TIG 275 machine.; FIGURE F.12 – FAN MOTOR BRACKET ASSEMBLY MOUNTING
  • Page 87 – FIGURE F.13 – SCR BRIDGE CONNECTIONS; Remove plug J1 from the control board. Also
  • Page 89 – This procedure takes approximately 60 minutes to perform.
  • Page 90 – POLARITY SWITCH REMOVAL AND REPLACEMENT; FIGURE F.14 – NAMEPLATE REMOVAL
  • Page 91 – FIGURE F.15 – POLARITY SWITCH CONNECTIONS
  • Page 92 – FIGURE F.16 – POLARITY SWITCH WIRING DIAGRAM
  • Page 93 – Replacement Procedure
  • Page 94 – This procedure takes approximately 2 hours to perform.
  • Page 95 – MAIN TRANSFORMER AND OUTPUT CHOKE ASSEMBLY; FIGURE F.17 – PLUG J8 LOCATION ON CONTROL BOARD; SCR Bridge Assembly Removal
  • Page 96 – FIGURE F.18 – TRANSFORMER CONNECTIONS; Figure
  • Page 97 – FIGURE F.19 – POLARITY SWITCH CONNECTIONS
  • Page 98 – Reassembly Procedure; SCR Bridge Assembly
  • Page 99 – RETEST AFTER REPAIR; Maximum Idle Amps
  • Page 102 – ELECTRICAL DIAGRAMS
  • Page 110 – I D E N T I F I C A T I O N
  • Page 111 – Notes
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SVM141-A

November, 1998

Safety Depends on You

Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However,
your overall safety can be in-
creased 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.

SERVICE MANUAL

For use with machine code numbers: 10523 & 10525

Square Wave TIG 275

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Summary

Page 2 - SAFETY; WARNING; CALIFORNIA PROPOSITION 65 WARNINGS; The Above For Diesel Engines

SAFETY i i SQUARE WAVE TIG 275 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...

Page 3 - ii; ELECTRIC SHOCK can kill.

SAFETY ii ii SQUARE WAVE TIG 275 ARC RAYS can burn. 4.a. Use a shield with the proper filter and cover plates to protect your eyes from sparks andthe rays of the arc when welding or observingopen arc welding. Headshield and filter lensshould conform to ANSI Z87. I standards. 4.b. Use suitable clothi...

Page 4 - iii

SQUARE WAVE TIG 275 FOR ELECTRICALLYpowered equipment. 8.a. Turn off input power using the disconnect switch at the fuse box before working onthe equipment. 8.b. Install equipment in accordance with the U.S. National Electrical Code, all local codes and the manufacturer’srecommendations. 8.c. Ground...

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