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System Fans
The 5017R-MF employs two sets of 4-cm counter-rotating fans to provide cooling.
Each fan unit is made up of two fans joined back-to-back, which rotate in opposite
directions. This counter-rotating action generates exceptional airfl ow and works to
dampen vibration levels. The fans can adjust their speed according to the heat level
sensed in the system, which results in more effi cient and quieter fan operation. Fan
speed is controlled by a setting in BIOS (see Chapter 7). Each fan in a set has its
own separate tachometer.
Note: It is very important that the chassis top cover is properly installed for the
airfl ow to circulate properly through the chassis and cool the components.
System Fan Failure
If a fan fails, the remaining fans will ramp up to full speed and the overheat/fan
fail LED on the control panel will blink on and off. Replace any failed fan at your
earliest convenience with the same type and model (the system can continue to
run with a failed fan).
Replacing System Fans (Figure 6-2)
1. Remove the chassis cover to see which fan has failed.
2. Power down the server and remove the AC power cord.
3. Detach the fan wiring then grasp the failed fan unit and lift it out of the chas-
sis.
4. Replace the failed fan with an identical 4-cm, 12 volt fan (see Appendix C).
5. Push the new fan into the vacant space in the housing making sure the ar-
rows on the top of the fan (indicating air direction) point in the same direction
as the arrows on the other fans.
6. Reposition the fan housing back over the two mounting posts in the chassis,
then reconnect the fan wires to the same chassis fan headers you removed
them from.
7. Power up the system and check that the fan is working properly and that
the LED on the control panel has turned off. Finish by replacing the chassis
cover.
Chapter 6: Advanced Chassis Setup
6-3
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