Chapter 3 - Hardware
0818D
User’s
Guide
3-10
Figure 3-2. Front View of I-Bus Monolithic Backplane
3.6 Backplane Cooling Fans and Blowers
For optimum cooling, the 0818D has eight 9.5 cfm fans at the bottom
of the card cage, two 23 cfm fans under the power supplies, and
three blowers located at the top of the card cage. The eight 9.5 cfm
and two 23 cfm fans are mounted on a fan tray which can be hot-
swapped (see Figure 3-3). However, the fan tray must be
immediately replaced after being withdrawn to avoid overheating. If
this is not possible, shut down the system before replacing the fans.
Figure 3-3. Fan Tray (partially withdrawn)
3.6.1 Removal of the Hot-Swap Fan Tray
Note: Removing the fan tray interrupts power to all fans.
Therefore, if the fan tray is being hot-swapped, you should have
another fan tray ready to install immediately after the first one is
removed to prevent the unit from overheating.
1. Loosen the captive Thumb Screw located on the right hand end
of the fan access cover at the bottom front of the enclosure.
2. Remove the access cover.
3. Grasp the two tray handles as shown in Figure 3-3 and slide the
fan tray out of the chassis.
3.6.2 Installation of the Hot-Swap Fan Tray
1. Carefully align the right and left hand edges of the fan tray
through the guide flanges in the chassis and slide the
replacement fan tray into the chassis and press firmly to engage
the power connectors at the rear of the chassis. If the system is
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