Hypertherm Powermax105 Service Manual - Manual (Page 244)

Power SuPPly ComPonent rePlaCement
9-46
powermax
105 Service Manual
Replace the inverter Igbt module
Complete the instructions below while referring to the applicable figure:
• 200-600 V CSA heat sink components on page 9-50
• 230-400 V CE, 380 V CCC/230-400 V CE heat sink components on page 9-51
• 380 V CCC/400 V CE heat sink components on page 9-52
1. Remove the four mounting screws from the inverter IGBT module.
2. Remove the thermal sensor and set it aside.
3. Remove the inverter IGBT module from the heat sink.
4. Clean the area where the inverter IGBT module was mounted, using isopropyl alcohol to remove the old thermal
grease from the heat sink.
5. Apply a thin coat (3 mils, approximately the thickness of a sheet of paper) of thermal grease evenly to the inverter
IGBT module mounting surface.
Replace the pilot arc Igbt
Complete the instructions below while referring to the applicable figure:
• 200-600 V CSA heat sink components on page 9-50
• 230-400 V CE, 380 V CCC/230-400 V CE heat sink components on page 9-51
• 380 V CCC/400 V CE heat sink components on page 9-52
1. Remove the two mounting screws from the pilot arc IGBT.
2. Remove the pilot arc IGBT from the heat sink.
3. Clean the area where the pilot arc IGBT was mounted, using isopropyl alcohol to remove the old thermal grease
from the heat sink.
4. Apply a thin coat (3 mils, approximately the thickness of a sheet of paper) of thermal grease evenly to the pilot arc
IGBT mounting surface.
5. Orient the pilot arc IGBT correctly and mount it to the heat sink by gently tightening the two supplied screws.
6. Alternately step torque the two mounting screws to the proper torque value as shown in the applicable figure.
7. Connect the supplied cable to the pilot arc IGBT terminals. The black wire connects to the top terminal (labelled
"E2" or "7") and the red wire connects to the bottom terminal (labelled "G2" or "6").