Hypertherm Powermax105 Service Manual - Manual (Page 246)

Power SuPPly ComPonent rePlaCement
9-48
powermax
105 Service Manual
Replace the damper resistor
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
1. Remove the two mounting screws from the damper resistor.
2. Remove the damper resistor from the heat sink.
3. Clean the area where the damper resistor 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 damper
resistor mounting surface.
5. Orient the damper resistor 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.
Replace the snubber resistor
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 appropriate snubber resistor.
2. Remove the snubber resistor from the heat sink.
3. Clean the area where the snubber resistor 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 snubber
resistor mounting surface.
5. Orient the snubber resistor 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. Tighten the two supplied standoffs, in the threaded holes of the snubber resistor, to 11.5 kg cm (10 in.-lbs).