GE Industrial Solutions CPS2400U - Manual (Page 41)

CPS2400U Upstream System – 19” Product Manual CPS2400U
850028186 r04 December 2013 41
Appendix A: Operating Temperature
Measurement and Vertical Spacing
Overview
The CPS2400U has been designed for mounting in relay racks or in equipment cabinets. It is designed for use with user
provided vertical airflow cooling of at least 175 linear feet per minute over the entire flow cross-section of the shelf.
Equipment may be placed on top of the CPS2400U provided airflow is not impeded or sufficient spacing is provided. A
1U Baffle is required above the highest converter shelf; this baffle provides sufficient vertical spacing. Direct the airflow
into a 3 inch minimum space. If the spacing is less than 3 inch spacing application specific testing is required.
Operating Temperature
The CPS2400U is rated to work to 65 C in stacks of two shelves in outdoor cabinets without baffles. Note: in outdoor
cabinets where the air entering the second shelf may be heated above 65°C inlet temperature, additional airflow
beyond the 175 linear feet per minute is required. These cases require an engineered solution.
In Central Office environments when baffles are required for safety reasons, a three shelf system is rated to operate in
55°C environments.
Baffles and Fan Trays
For Central Office applications, baffles are used between every set of three Converter shelves. Fan Shelves are required
for every set of three Converter shelves. No more than 6 shelves may be located in a particular frame. Slot covers must
be used on all empty slots when more than one shelf is being cooled by a particular airflow device.
Always mount converter shelves above the fan tray that cools them.
Leave no space between the top of a fan tray and the converter shelf above it. The Fan Shelf draws air down through
whatever equipment is located directly above it. If a gap is left above a fan tray, air will be drawn into the fan tray from
the aisles rather than from the converter shelf above the fan tray. This will result in service effecting problems due to
insufficient cooling air flowing through the active converters.
The Fan Shelf forces air up through whatever equipment is located directly above it. If a gap is left above a fan tray, air
will escape into the aisles rather than flowing into the converter shelf above the fan tray. This will result in service
effecting problems due to insufficient cooling air flowing through the active converters.
Always mount a converter shelf immediately above a fan shelf or above a converter shelf stacked on a fan shelf. Any
gaps between converter shelves, or absence of slot covers, can cause service effecting problems.
Note: All unpopulated converter slots must be filled with slot fillers. For example the figure below shows a shelf with
operational converters in the first two slots and slot fillers in the remaining 10 slots:
Figure 33 Converter Slot Fillers