Lincoln Electric INVERTEC SVM129-B - Manual (Page 101)

TROUBLESHOOTING & REPAIR
F-63 F-63
INVERTEC® STT® & STT® II
SWITCH BOARD REPLACEMENT (continued)
ELECTRIC SHOCK can
kill.
• With input power ON, there
are high voltages in the
machine. Do not reach
into the machine or touch
any internal part.
8. With the machine connected for 440/460 volt
operation and the proper input voltage
applied, turn on input power to the machine.
9. With the output free of a load, check open cir-
cuit voltages of the output. Voltage should be
85 VDC maximum.
10. Remove input power. Then remove the
5-amp fuses from the input supply fuse hold-
ers.
11. Install 20-amp fuses and test under load.
NOTE: A resistive-type grid load bank is recom-
mended.
14. Perform Retest After Repair.
WARNING
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