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2-38 Equipment
Equipment fan shelves
In addition to the cabinet roof fans, there are equipment fan shelf assemblies
mounted in the equipment frame/bay in the interior of the equipment
compartment. Equipment fan shelves enhance equipment cooling.
Up to two fan shelves, can be mounted in each frame/bay. One NT4K0610
8-fan shelf is demonstrated (see
The NT4K0610 8-fan shelf consists of eight 4-inch, -48 V dc,
110 cubic feet per minute (CFM) fans in a 1-position mounting framework.
Each individual fan unit is thermally fused for protection against overheating.
Figure 2-26
NT4K0610 8-fan shelf
Fan alarms
The environmental control unit (ECU) generates high temperature alarms
when interior temperatures exceed 149° F (65° C) ± 2° C.
The fan equipment shelves generate a major fan fail alarm (FFA) and the front
panel red LED illuminates when at least one fan unit fails in the shelf. The fan
shelves provide connection points for fan failure alarm reporting to the ECU.
AN2016 Cabinet User Guide
Figure
Rel 1.0 Standard May 1999
2-26).
FW-15607
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