Replacing the inverter igbt module – Hypertherm Powermax125 Service Manua User Manual
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Powermax125 Service Manual 808070
9 – Power Supply Component Replacement
Replacing the inverter IGBT module
1. Complete the following procedures:
a. See Disconnect the power and gas supply on page 166.
b. See Remove the power supply cover on page 172.
c. See Remove the component barrier on page 173.
d. See Remove the DSP board on page 203.
e. See Remove the power board on page 205.
2. Remove the 4 mounting screws from the inverter IGBT module. See Figure 76 on page 215.
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 Figure 76 on
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. See Install the power board on page 206.
b. See Install the DSP board on page 203.
c. See Install the component barrier on page 173.
d. See Install the power supply cover on page 172.
e. Reconnect the power and gas supply.
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