The inverter electronics are convection cooled. The primary equipment used for
this function consists of a fan tray located in a plenum within the inverter. The
PM electronics are isolated, and heat is transferred to the plenum airflow via a
large heatsink.
The PM fan tray is modular and holds four smart fans that operate together
and also provide redundancy; the inverter will operate to full power with four fans
operating and will enter a power derating mode under failure of any fan.
These fans are protected by air filters at the plenum air inlet and outlet.
The order of fan is shown in Figure 5-15.
Follow the warning "FXX" to replace the fan which was broken.
Refer to Figure 5-16 and follow the steps outlined below:
1.Remove four screws that secure inlet filter cover to case.
Check filter condition on this step and clean it if necessary.
For fan maintenance, continue to do following steps.
2.On the right side, remove two screws for each fan tray.
3.On the right side, unplug fan power connectors for each fan.
(To release snap-fit, press location A and location B from both side .)
4.Pull fan tray out from PM chassis.
To disassemble fan , remove four screws that secure it to fan tray.
To reassemble reverse the order of the above procedure and tighten screws to
torque values indicated in Figure 5-16.
5.4.2 Power Module (PM) Fan Tray
73
Maintenance
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