Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 133

F-73
TABLE F.6 – NOTE: This test will NOT determine if an individual IGBT device is open.
Apply
Positive
Test
Probe to
Terminal
2/4
9
2/4
9
NOTE: K ohm = ohm reading multiplied by 1000.
NOTE: Always make sure that all four Switch Boards are changed at the same time. Never
mix an old style (different part number) Switch Board with a new style (new part
number).
TROUBLESHOOTING & REPAIR
IGBT/SWITCH BOARD TEST (G3165-1)
Apply
Negative
Test
Probe to Test
Terminal Result
12 Greater than OK
1k ohms
Less
than 1K
ohms
1/3 Greater
than 1K
ohms
Less than
1k ohms
9 Less
than 100
ohms
Greater than Open
1k ohms
2/4 Greater than OK
1k ohms
Less
than 1K
ohms
POWER WAVE 450
Repair
Conclusion Action
None
Shorted Replace
Switch
Boards
OK None
Shorted Replace
Switch
Boards
OK None
Replace
Switch
Boards
None
Shorted Replace
Switch
Boards
F-73
Next
Procedure
Continue
Snubber
Resistor
Test
Continue
Snubber
Resistor
Test
Continue
Snubber
Resistor
Test
Continue
Snubber
Resistor
Test