Lincoln Electric Ln 9 Svm127 A Users Manual Svm127a

2015-02-09

• Master TOC
• Safety
• Section A Installation
• Section B Operation
• Section C Accessories
• Section D Maintenance
• Section E Theory of Operation
• Section F Troubleshooting & Repair
• Symptoms
  • No wire feed when gun trigger is activated. The digital meter does NOT light. The drive rolls do not turn.
  • No wire feed when gun trigger is activated. The digital meter DOES light but reads zero in both (set and ....
  • The wire feed "coasts" when the gun trigger is released. The inter-lock switch is OFF.
  • No wire feed when gun trigger is activated. The drive rolls do not turn. The digital meter does light ....
  • The wire feeds when the gun trigger is activated, but there is no arc voltage.
  • The SET speed is adjustable and steady. The actual speed is uncontrollable. The meter displays the ....
  • The SET speed is adjustable and steady. The actual speed reading is incorrect, erratic, or zero.
  • The SET speed is erratic or not adjustable over entire range of control. The actual speed is also erratic ....
  • The wire continues to feed with the gun trigger open, and the wire is electrically "hot." The interlock ....
  • The wire feeds when the interlock switch is in the "ON" position. No welding or gun trigger activation.
  • With the interlock switch in the "ON" position, the wire feed stops when the gun trigger is released.
  • The SET voltage is erratic or not adjustable over the entire range of control. The actual voltage is also ....
  • The field fuse (F101), located on the power PC board, repeatedly fails.
  • Circuit breaker (5 amp) repeatedly trips when the gun trigger is activated.
  • Circuit breaker (5 amp) trips when power is applied to the LN-9. Gun trigger is NOT activated.
  • The 1/8 amp fuse on the voltage PC board repeatedly fails.
  • The LN-9 shuts down while welding. Upon retriggering, the gun the unit will weld again for a period of ....
  • 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.
  • The SET and actual speed meter readings match within a few IPM, but both are in error.
  • SET speed and actual speed meter readings do NOT match within a few IPM. One or both readings may be erratic.
  • SET volts and actual volts readings match within a few tenths of a volt while welding. However, both readings are inaccurate.
  • The actual volts reading does NOT match the SET volts reading within few tenths of a volt while welding.
  • The output voltage is too low to start the weld.
  • Voltage seems to be too high or the arc flares at the start of weld. Welding is good.
  • The arc voltage appears to rise too slowly or stubs or blasts at the start of a weld. Once started the welding is good.
• Section G Electrical Diagrams