Hypertherm Powermax65 Mode D'emploi page 12

Powermax65/85 Power board rePlacement
Install new power board
1. Position left edge of power board on a slight angle toward the front end panel, so the previously removed wire
connectors will reach their intended locations.
2. If the power supply has a CNC interface installed, plug the respective wire connectors into the J21 and J32 power
board connectors.
3. Plug respective wire connectors into J1, J2, J3, J4, J5, J12 and J20 power board connectors.
4. Slide the power board into the mounting position while routing the gate drive wires through the two openings in the
board.
Note: Make certain all power board connection wires (ten wires with metal ring terminals) are
positioned in front of the power board.
5. Install the four board mounting screws using a #2 Phillips screwdriver to tighten to 10 in-lbs (11.5 kg cm).
6. Install the three heat sink mounting screws using a #2 Phillips screwdriver to tighten to 15 in-lbs (17.3 kg cm).
Note: It may be necessary to pull the top of the front panel slightly forward to install the upper left heat
sink mounting screw.
7. Connect the electrode wire (red) to J28 using a #2 Phillips screwdriver to tighten the screw to 20 in-lbs
(23.0 kg cm).
8. Install the two pilot arc IGBT screws, securing the nozzle wire (black) to the board with the left screw. Use a
#2 Phillips screwdriver to tighten both screws to 20 in-bs (23.0 kg cm).
Note: All screw mounting holes which secure a wire to the power board, except for J28, have a yellow
silkscreen outline on the board depicting the placement of the ring terminal.
9. Install the four diode screws, securing the output inductor wire to the board with the upper left screw. Use a
#2 Phillips screwdriver to tighten all four screws to 20 in-lbs (23.0 kg cm).
10. Install the six snubber resistor screws using a #2 Phillips screwdriver to tighten to 15 in-lbs (17.3 kg cm).
11. Verify that the gray dot on each capacitor is visible through the two viewing holes. Start the four capacitor screws
by hand, then use a #2 Phillips screwdriver to tighten to 20 in-lbs (23.0 kg cm).
12. Connect the top snubber resistor wire to J13 using a #2 Phillips screwdriver to tighten the screw to 20 in-lbs
(23.0 kg cm).
13. Install the two input bridge screws, securing the remaining snubber resistor wire with the upper input bridge screw.
Tighten both screws to 20 in lbs (23.0 kg cm).
14. Connect the work lead at J26 using a #3 Phillips screwdriver to tighten the screws to 30 in lbs (34.6 kg cm).
15. Secure the 3uF capacitor on the left and the longer transformer wire to the board using the three inverter IGBT
screws. Use a #3 Phillips screwdriver (Powermax85) to tighten the screws to 30 in lbs (34.6 kg cm). Use a
#2 Phillips screwdriver to tighten the screws to 20 in-lbs (23.0 kg cm) on a Powermax65.
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Field Service Bulletin