Lincoln Electric POWER MIG SVM157-A User Manual
Power mig, Service manual svm157-a
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Table of contents
Document Outline
- Master Table of Contents
- Safety Section
- Section A - Installation
- Section B - Operation
- Section C - Accessories
- Section D - Maintenance
- Section E - Theory of Operation
- Section F - Troubleshooting & Repair
- Symptoms
- Major physical or electrical damage is evident.
- The machine is dead-no open circuit voltage and no wire feed when the gun trigger is activated. The cooling fan is not...
- There is no open circuit voltage or wire feed when the gun trigger is activated. The cooling fan is...
- When the gun trigger is activated and the wire feeds normally, but there is no open circuit voltage.
- Output voltage and wire feed speed is present when the gun trigger is NOT activated.
- The machines output is low. Welds are “cold”. The weld beads are rounded or “humped” demonstrating...
- The output voltage is continuous when the gun trigger is NOT activated. The wire feed functions normally.
- There is no gas flow when the gun trigger is activated . The wire feeds and the arc voltage is present.
- The machine stops feeding wire while welding. When the gun trigger is released and pulled again, the wire feed starts.
- Rough wire feeding or the wire will not feed but the drive rolls are turning.
- No control of wire feed speed. Other machine functions are normal.
- There is no wire feed when the gun trigger is activated. Normal open circuit weld voltage is present and the gas solenoid...
- Poor arc striking with electrode sticking or blasting off.
- The arc is unstable and or “hunting”
- The weld bead is narrow or ropy. May have porosity with the electrode stubbing into the plate.
- The contact tip seizes in the gas diffuser.
- Section G - Electrical Diagrams