Active Scr Test - Lincoln Electric SQUARE WAVE SVM118-A Service Manual

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Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid elec-
trical shock, please observe all safety notes and precautions detailed throughout this manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical trou-
bleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353 (WELD).
TEST DESCRIPTION
The Active SCR Test will determine if the device is able to be gated "ON" and conduct cur-
rent from anode to cathode.
MATERIALS NEEDED
An SCR tester as outlined in this procedure
5/16" Nut driver
Machine Wiring Diagrams (See Electrical Diagrams section of this manual.)
SCR Test Points drawing, Figure F.20.
TROUBLESHOOTING & REPAIR

ACTIVE SCR TEST

WARNING
SQUARE WAVE TIG 355
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