Lincoln Electric Precision Tig 275 Svm162 B Users Manual

2015-02-09

• Master Table of Content
• Safety
• Section A - Installation
• Section B - Operation
• Section C - Accessories
• Section D - Maintenance
• Section E - Theory of Operation
• Section F - Troubleshooting and Repair
• Symptoms
  • The machine is dead. No weld output – no 115 VAC at the receptacle.
  • No welding output. The 115 VAC is present at the receptacle.
  • No output from the machine in either Stick or TIG modes. The thermal light is on.
  • The machine does not respond (no gas flow, no high frequency and no open circuit voltage) when the arc start switch or Amptrol is activated. The thermal light is not lit.
  • The machine does not have welding output in the Stick mode. The machine operates correctly in the TIG mode.
  • The machine has welding output in the Stick mode but no output in the TIG mode. ( no gas flow or high frequency).
  • The machine welds at a very low output regardless of the current control setting.
  • The machine welds at a very high output regardless of the current control setting.
  • Accessories plugged into the volt receptacle do not work.
  • The machine makes a very loud buzzing noise in DC Stick or in DC TIG modes. There is no current draw from the machine’s output terminals. (The machine is not externally loaded).
  • The machine output is intermittently lost. Gas flow and high frequency are also interrupted.
  • No gas or water flow (with optional water solenoid) when the arc start switch or Amptrol is activated in the TIG mode. All other machine functions are normal.
  • No high frequency. The machine is in the TIG mode and has normal output.
  • The High frequency is on continuously in DC TIG or shuts off in AC TIG.
  • High frequency “spark” is present but weak.
  • Poor arc starting in the DC TIG mode.
  • The high frequency “spark” is present at the tungsten electrode, but the operator is unable to establish a welding arc. The machine has a normal open circuit voltage. Refer to Technical Specifications in the Installation section.
  • When AC TIG welding, the arc is erratic and there is a loss of “cleaning” of the work piece.
  • Arc “pulsates” in AC polarity. DC TIG is OK.
  • The stick electrode “blasts-off” when touched to the work piece.
  • Variable or sluggish welding arc when welding in the Stick mode.
  • The meter does not display V (volt) or minimum current.
  • The AC wave balance control does not function properly.
  • Gas pre-flow and post-flow time is too long.
  • The meter does not display V (volt) or minimum current.
  • The meter does not light up. Other machine functions are OK.
• Section G - Electrical Diagrams