Welding System User Manual
Table Of Contents
- 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
- Major Physical or Electrical Damage is Evident
- Machine is dead - No Open Circuit Voltage output and No Wire Feed when gun trigger is pulled. No Display.
- No Open Circuit Voltage output but wire feeds normally when gun trigger is pulled. Display lights properly.
- No Open Circuit Voltage output and no wire feed when gun trigger is pulled. Display is functioning properly.
- Wire feeds but welding output is low causing wire to "stub". Welds are "cold". Machine cannot obtain full rated output of 250 amp
- The output voltage and wire feed is present continuously or pulsing when gun trigger is NOT activated.
- Output settings (voltage and/or wire feed speed) are being changed even though gun thumb switch or keypad
- No wire feed or open circuit voltage when gun trigger is pulled. The display lights up but the audio alarm and the display do not
- The audio alarm does NOT sound when a key is pressed, but display changes.
- The audio alarm does not sound when a key is pressed, and the display does NOT change.
- There is no gas flow when gun trigger is pulled. Wire feeds and weld voltage is present. The display functions properly.
- No readable message on the display. Backlight is lit indicating there is power to the machine.
- The display backlight does not function.
- The machine stops feeding wire while welding and the MOTOR OVERLOAD message appears on the display.
- No control of wire feed speed. Other machine functions are normal.
- There is no wire feed when gun trigger is pulled. Normal open circuit voltage is present.
- The arc is unstable and or "hunting".
- Weld bead is narrow or ropey. May have porosity with electrode stubbing into plate.
- The contact tip seizes in the gas diffuser.
- Section G Electrical Diagrams
F-43
TROUBLESHOOTING & REPAIR
F-43
IDEALARC SP-250
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MATERIALS NEEDED
5/16" Nut Driver
1/2" Open End Wrench
1/2" Socket wrench, universal tool, and extension
3/8" Open End Wrench
Slot head screwdriver
Wire cutters
SCR OUTPUT RECTIFIER REMOVAL
Service and repair should be performed only by Lincoln Electric factory trained per-
sonnel. Unauthorized repairs performed on this equipment could result in danger to
the technician or the machine operator and will invalidate your factory warranty. For
your safety and to avoid electrical shock, please observe all safety notes and pre-
cautions detailed throughout this manual.
If for any reason you do not understand the test procedures or are unable to perform
the tests/repairs safely, contact the Lincoln Electric service department for technical
troubleshooting assistance before you proceed.
Call (216) 383-2531 or (800) 833-9353 (WELD).
WARNING