212
Powermax125
Service Manual 808070
9 – Power Supply Component Replacement
Replacing the inverter IGBT module
1.
Complete the following procedures:
a.
Disconnect the power and gas supply
b.
c.
d.
e.
2.
Remove the 4 mounting screws from the inverter IGBT module. See
3.
Remove the thermal sensor and set it aside.
4.
Remove the inverter IGBT module from the heatsink.
5.
Clean the area where the inverter IGBT module was mounted, using isopropyl alcohol to remove the old thermal
grease from the heatsink.
6.
Apply a 0.0762 mm (0.003 inch) layer of thermal grease, about the thickness of a sheet of paper, evenly to the
inverter IGBT module mounting surface.
7.
Mount the inverter IGBT module to the heatsink by hand-tightening the 4 supplied mounting screws, using the longer
brass screw to capture the ring terminal of the thermal sensor between the screw head and the upper left mounting
hole of the inverter IGBT module.
8.
Step-torque the 4 mounting screws in a diagonal sequence to the proper torque value as shown in
9.
Connect the supplied gate drive cables to the inverter IGBT module terminals, as follows:
a.
On the left side:
Attach the black wire from one cable to the “G2” or “6” terminal.
Attach the red wire from the same cable to the “E2” or “7” terminal.
b.
On the right side:
Attach the black wire from the other cable to the “E1” or “5” terminal.
Attach the red wire from the same cable to the “G1” or “4” terminal.
10.
Complete the following procedures:
a.
b.
c.
d.
Install the power supply cover
e.
Reconnect the power and gas supply.
Kit number
Description