Troubleshooting & repair – Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B User Manual
Page 134
F-74
F-74
IGBT/SWITCH BOARD TEST (Continued)
TABLE F.6
(Continued)
TROUBLESHOOTING & REPAIR
POWER WAVE 450
Apply
Apply
Positive
Negative
Test
Test
Probe to
Probe to
Test
Repair
Next
Terminal
Terminal
Result
Conclusion
Action
Procedure
12
1/3
Less than
OK
None
Continue
100 ohms
Greater Open
Replace
Snubber
than 1K
Switch
Resistor
ohms
Boards
Test
1/3
12
Greater
OK
None
Continue
than 1K
ohms
Less than
Shorted
Replace
Snubber
1k ohms
Switch
Resistor
Boards
Test
12
401/403
Greater
OK
None
Continue
405/407
than 1K
ohms
Less than
Shorted
Replace
Snubber
1k ohms
Switch
Resistor
Boards
Test
401/403
12
Less than
OK
None
Continue
405/407
100 ohms
Greater
Open
Replace
Snubber
than 1K
Switch
Resistor
ohms
Boards
Test
9
402/404
Less than
OK
None
Continue
406/408
100 ohms
Greater
Open
Replace
Snubber
than 1K
Switch
Resistor
ohms
Boards
Test
402/404
9
Greater
OK
None
Continue
406/408
than 1K
ohms
Less than
Shorted
Replace
Snubber
1k ohms
Switch
Resistor
boards
Test
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).