Lincoln Electric LN-8 SVM132-A User Manual
Ln-8 semiautomatic wire feeder, Service manual svm132-a
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Table of contents
Document Outline
- 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