Lincoln Electric Ln 8 Svm132 A Users Manual Svm132a

2015-02-09

• Master Table of Contents
• Safety
• Section A - Installation
• Section B - Operation
• Section C - Accessories
• Section D - Maintenance
• Section E - Theory of Operation
• Section F - Troubleshooting and Repair
• Symptoms
  • No wire feed or arc voltage when the gun trigger is activated. The drive rolls do not turn. The LN-8 appears “dead”.
  • The wire feeds when the gun trigger is activated but there is no arc voltage.
  • The wire continues to feed with the gun trigger open, and the wire is electrically “hot”. The interlock switch is in the “off” position.
  • With the interlock switch (S2) in the “ON” postion, the wire feed stops when the gun trigger is released.
  • The circuit breaker (5 amp) repeatedly trips when the gun trigger is activated.
  • The circuit breaker (5 amp) trips when power is applied to the LN-8. Gun trigger is NOT activated.
  • The 1/2 amp fuse on the relay board repeatedly fails.
  • The drive motor thermostat “opens” while welding.
  • The wire feed speed cannot be controlled. The motor runs and feeds wire but the speed cannot be changed regardless of control setting.
  • The wire feed “coasts” when the gun trigger is released.
  • The wire feeds normally and welds but the solenoid is not operating.
  • When the gun trigger is activated the wire “backs up” instead of feeding forward.
  • When the gun trigger is activated, the drive rolls turn but the wire will not feed or wire feeding is rough.
  • The welding arc is variable or “hunting”.
  • Poor arc striking with sticking or “blast offs”. The weld bead may also be ropey and display weld porosity.
• Section G - Electrical Diagrams