Powermax125
Service Manual 808070
211
9 – Power Supply Component Replacement
Replacing the pilot arc IGBT
1.
Complete the following procedures:
a.
Disconnect the power and gas supply
b.
c.
d.
e.
2.
Remove the 2 mounting screws from the pilot arc IGBT. See
3.
Remove the pilot arc IGBT with its red and black wire pair from the heatsink.
4.
Clean the area where the pilot arc IGBT was mounted, using isopropyl alcohol to remove the old thermal grease from
the heatsink.
5.
Apply a 0.0762 mm (0.003 inch) layer of thermal grease, about the thickness of a sheet of paper, evenly to the pilot
arc IGBT mounting surface.
6.
Mount the pilot arc IGBT to the heatsink by hand-tightening the 2 supplied mounting screws.
7.
Step-torque the 2 mounting screws to the proper torque value as shown in
8.
Connect the supplied cable to the pilot arc IGBT terminals. The black wire connects to the top terminal (labeled “E2”
or “7”), and the red wire connects to the bottom terminal (labeled “G2” or “6”).
9.
Complete the following procedures:
a.
b.
c.
d.
Install the power supply cover
e.
Reconnect the power and gas supply.
Kit number
Description