Hypertherm Powermax65 Service Manual Rev.1 - Manual (Page 204)

Component ReplaCement
6-22
powermax
65/85 Service Manual
Replace the power board (200 – 600V CSA)
Refer to the figure on the next page when performing the following procedure.
Remove the old power board (200 – 600V CSA)
1. Unplug the five wire connectors located at the J1, J2, J3, J4, and J5 headers on the heatsink side of the power
board.
2. Disconnect the three gate drive wire connectors (J17, J18, and J19) from the power board.
3. Disconnect the PFC temperature sensor connector (J16) from the power board.
4. Remove the 3uF capacitor on the left and the longer transformer wire using a #3 Phillips screwdriver (Powermax85)
to remove the three inverter IGBT screws. Use a #2 Phillips screwdriver to remove the screws on the Powermax65.
5. Disconnect the remaining transformer wire using a #2 Phillips screwdriver to remove the screw at J29.
6. Disconnect the work lead wire using a #3 Phillips screwdriver to remove the screw at J26.
7. Remove the 3uF capacitor on the right and the two PFC inductor wires below it using a #3 Phillips screwdriver to
remove the three PFC IGBT screws and the screw securing the shorter PFC inductor wire.
8. Disconnect the snubber resistor wires using a #2 Phillips screwdriver to remove the screw at J13 and the two input
bridge screws.
9. Remove the six snubber resistor screws and four capacitor screws using a #2 Phillips screwdriver.
10. Disconnect the output inductor wire by removing the upper left diode screw with a #2 Phillips screwdriver.
11. Remove the three remaining diode screws.
12. Disconnect the nozzle wire (black) using a #2 Phillips screwdriver to remove the pilot arc IGBT screw on the left.
13. Remove the remaining pilot arc IGBT screw.
14. Disconnect the electrode wire (red) using a #2 Phillips screwdriver to remove the screw at J28.
15. 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 power board.
16. Remove the four board mounting screws using a #2 Phillips screwdriver.
17. Pull the right-hand edge of the power board forward, while pushing the gate drive wires through the two openings in
the board, until the components on the back side of the board clear the rear panel.
Note: Silkscreen printing above the opening in the board denotes the color and order of the gate drive wires.
The printing is “BLK” (black), “RED” (red), “BLK” (black), “RED” (red) from left to right.
18. 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).
19. Unplug the wire connectors from the J12 and J20 power board connectors.
20. If a CNC interface is installed on the power supply, unplug the wire connectors from the J21 and J32 power board
connectors.
21. Remove the power board from the power supply and set aside.