10 Powermax45/45 XP Field Service Bulletin 807990
Powermax45/45 XP Snubber Resistor Replacement Kit
Reinstall the power board (400 V CE and 480 V CSA)
The following procedure applies to 400 V CE and 480 V CSA power boards. Please refer to Figure 4 on page 5 and
Figure 5 on page 6 when performing this procedure.
1. Before reinstalling the power board, spread a thin layer of thermal compound (included in the parts kit) 2 mm thick
(about the thickness of a sheet of paper) on all the IGBTs and the input bridge diode (or diodes).
Note: Remix the compound if the material separates.
2. Line up the holes for the capacitor screws with the capacitors; the pressure relief vents should be visible from the
two notches in the power board.
3. Push the power board straight in.
4. Replace the 4 heat sink assembly screws and torque them to 23.0 kg cm (20 inch-pounds).
5. Replace the 3 retaining screws and the four snubber resistor screws. Torque these screws to 17.3 kg cm
(15 inch-pounds).
6. Reconnect the 3 white wires from the ON/OFF switch to J1, J2, and J3. Torque them to 23.0 kg cm
(20 inch-pounds)
7. Replace the 2 screws that attach the IGBTs and the screw that attaches the input bridge diode to the heat sink. The
torque setting for these screws is 23.0 kg cm (20 inch-pounds). (If you are reinstalling an older 400 V CE power
board, use the 2 screws to reattach the 2 input bridge diodes to the heat sink.)
8. Replace the 4 capacitor screws and torque them to 23.0 kg cm (20 inch-pounds). Be sure to reattach the black wire
to the left-most screw.
9. Reconnect the wires to the transformers and inductors at J13, J14, J15, J16, J17, J18, J19, and J20 and the work
lead ring terminal at J21. Torque them to 23.0 kg cm (20 inch-pounds).
10. Replace the connectors at J10, J12, and J22 and the connectors at J4, J5, and J6.
11. Reconnect the ribbon cable from the control board to the power board at J8.
Continue with the procedure on the next page.
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