Lincoln Electric LN-9 SVM127-A User Manual
Ln-9 wire feeder, Svm127-a, Service manual
SVM127-A
November, 1996
Safety Depends on You
Lincoln arc welding equipment
is designed and built with safety
in mind. However, your overall
safety can be increased by
proper installation. . . and
thoughtful operation on your
part. DO NOT INSTALL,
OPERATE OR REPAIR THIS
EQUIPMENT WITHOUT READ-
ING THIS MANUAL AND THE
SAFETY PRECAUTIONS CON-
TAINED THROUGHOUT. And,
most importantly, think before
you act and be careful.
SERVICE MANUAL
World’s Leader in Welding and Cutting Products Premier Manufacturer of Industrial Motors
Sales and Service through subsidiaries and Distributors Worldwide
22801 St. Clair Ave. Cleveland, Ohio 44117-1199 U.S.A. Tel. (216) 481-8100
For use with machines having Code Numbers: 9134, 9842, 9958, 10316, 10327
LN-9 Wire Feeder
RETURN TO MAIN INDEX
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