Lincoln Electric LN-9 SVM127-A User Manual
Ln-9 wire feeder, Svm127-a, Service manual
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Table of contents
Document Outline
- 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