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MASTER TABLE OF CONTENTS FOR ALL SECTIONS
v v
SQUARE WAVE TIG 275
Page
Safety...................................................................................................................................................................i-iv
Installation...............................................................................................................................................Section A
Technical Specifications ...............................................................................................................................A-2
Safety Precautions .......................................................................................................................................A-3
Input Supply Connections ............................................................................................................................A-4
Input Reconnect Procedure .........................................................................................................................A-5
User Supplied Connectors ...........................................................................................................................A-6
Output Connections......................................................................................................................................A-6
Work Cable Connection ...............................................................................................................................A-6
TIG Torch Connection ..................................................................................................................................A-7
Twist-Mate Adapter for LA-9 and LA-17 TIG Torch......................................................................................A-8
Twist-Mate Adapter for LW-18 and LW-20 TIG Torch...................................................................................A-8
Stick Electrode Cable Connection................................................................................................................A-9
Operation.................................................................................................................................................Section B
Safety Precautions .......................................................................................................................................B-2
General Description......................................................................................................................................B-3
Recommended Processes and Equipment..................................................................................................B-3
Design Features and Advantages................................................................................................................B-3
Welding Capability........................................................................................................................................B-4
Limitations ....................................................................................................................................................B-4
Controls and Settings...................................................................................................................................B-5
Welding Operation........................................................................................................................................B-6
Stick Welding................................................................................................................................................B-9
Auxiliary Power.............................................................................................................................................B-9
Accessories ............................................................................................................................................Section C
Maintenance............................................................................................................................................Section D
Safety Precautions.......................................................................................................................................D-2
Routine and Periodic Maintenance..............................................................................................................D-2
Overload Protection .....................................................................................................................................D-2
Fan As Needed (F.A.N.)...............................................................................................................................D-2
Service Procedures......................................................................................................................................D-2
Component Location and Access ................................................................................................................D-3
Spark Gap Adjustment .................................................................................................................................D-3
Theory of Operation ...............................................................................................................................Section E
General Description......................................................................................................................................E-2
Input Power Circuit.......................................................................................................................................E-2
Output Rectification, Control Board and Feedback......................................................................................E-3
High Voltage / High Frequency Circuit.........................................................................................................E-4
DC Welding Output ......................................................................................................................................E-5
AC Welding Output.......................................................................................................................................E-6
SCR Operation.............................................................................................................................................E-7
Protective Circuits ........................................................................................................................................E-8
Troubleshooting and Repair..................................................................................................................Section F
How to Use Troubleshooting Guide .............................................................................................................F-2
PC Board Troubleshooting Procedures........................................................................................................F-3
Troubleshooting Guide .................................................................................................................................F-4
Test Procedures..........................................................................................................................................F-18
Oscilloscope Waveforms ............................................................................................................................F-33
Replacement Procedures...........................................................................................................................F-42
Retest After Repair .....................................................................................................................................F-59
Electrical Diagrams................................................................................................................................Section G
Parts Manual .......................................................................................................................................P316 Series
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