Hypertherm Powermax65 Mode D'emploi page 7

Replace the power board
Please refer to Figure 1 on the next page when performing the following procedure.
Remove the power board
1. Unplug the five wire connectors located at the J3, J4, J5, J6, and J7 headers on the heat sink side of the power
board.
2. Disconnect the two gate drive wire connectors (J18, J19) from the power board.
3. Remove the 3uF capacitor and the two transformer wires below it using a #3 Phillips screwdriver to remove the
three inverter IGBT screws and the screw at J30.
4. Disconnect the work lead wire using a #3 Phillips screwdriver to remove the screw at J27.
5. Disconnect the AC input wires and PFC inductor wires using a #2 Phillips screwdriver to remove the screws at J1,
J2, J13, J23, and J24.
6. Remove the four snubber resistor screws and four capacitor screws using a #2 Phillips screwdriver.
7. Disconnect the MOV subassembly from the board using a #2 Phillips screwdriver to remove the two input bridge
screws on the right.
8. Remove the remaining three input bridge screws.
9. Disconnect the output inductor wire by removing the upper left diode screw with a #2 Phillips screwdriver.
10. Remove the three remaining diode screws.
11. Disconnect the nozzle wire (black) using a #2 Phillips screwdriver to remove the pilot arc IGBT screw on the left.
12. Remove the remaining pilot arc IGBT screw.
13. Disconnect the electrode wire (red) using a #2 Phillips screwdriver to remove the screw at J29.
14. Remove the three heat sink mounting screws using a #2 Phillips screwdriver.
Note: It may be necessary to pull the top of the front panel slightly forward to remove the upper left heat
sink mounting screw from the board.
15. Remove the four board mounting screws using a #2 Phillips screwdriver.
16. Pull right hand edge of power board forward, while pushing the gate drive wires through the opening in the board,
until components on back side of board will clear the rear panel.
Note: There is silkscreen print above the opening in the board, denoting the color and orientation of the
gate drive wires, if they are accidently disconnected from the IGBT while removing the board.
17. Slide the board to the right until the wire connectors on the left edge of the board are accessible, approximately 2
inches (5.1 cm).
18. Unplug the wire connectors from the J15 and J20 power board connectors.
19. If the power supply has a CNC interface installed, unplug the wire connectors from the J21 and J33 power board
connectors.
20. Remove the power board from the power supply and set aside.
Field Service Bulletin
All manuals and user guides at all-guides.com
Powermax65/85 Power board rePlacement
(380/400V CE)
5