Lincoln Electric SVM170-A User Manuals

Table of Contents

• Master Table of Contents

  6
• Safety Section

  2
• Section A - Installation

  7
• Section B - Operation

  13
• Section C - Accessories

  23
• Section D - Maintenance

  29
• Section E - Theory of Operation

  33
• Section F - Troubleshooting and Repair

  41
• Symptoms

  44
  • Major Physical or Electrical Damage is Evident

    44
  • Machine is dead — no open circuit voltage output and no wire feed when gun trigger is pulled. The machine display may be lit.

    44
  • No open circuit voltage output but wire feeds normally when gun trigger is pulled.

    45
  • Wire feeds but welding output is low causing wire to “stub”. Welds are “cold”. Machine cannot obtain full rated output of 200 amps at 28 volts.

    45
  • The output voltage and wire feed is present continuously or pulsing when gun trigger is NOT activated.

    46
  • The output voltage is present continuously when gun trigger is NOT activated.

    46
  • No control of arc voltage. Wire feeding is normal.

    47
  • There is no gas flow when gun trigger is pulled. Wire feeds and weld voltage is present.

    47
  • The machine stops feeding wire while welding.

    47
  • No control of wire feed speed. Other machine functions are normal

    48
  • There is no wire feed when gun trigger is pulled. Normal open circuit voltage is present.

    48
  • The arc is unstable and or “hunting”.

    49
  • Weld bead is narrow or ropy. May have porosity with electrode stubbing into plate.

    49
  • The contact tip seizes in the gas diffuser.

    50
  • The welding arc is variable and sluggish.

    50
  • The arc striking is poor.

    50
• Section G - Electrical Diagrams

  99