GE Industrial Solutions CPS3200U - Manual (Page 46)

CPS3200U Upstream System – 23” Product Manual CPS3200U
CC848779826 r09 December 2013 46
Appendix A: Operating Temperature
Measurement and Vertical Spacing
Overview
The CPS3200U 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 CPS3200U 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 CPS3200U 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 65C 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
55C 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.
When mounting fan trays with converter shelves, leave no space between the top of a fan tray and the converter shelf
above it. The QS930A 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 QS931A 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.
When mounting converter shelves 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 14 slots:
Figure 43 Converter Shelf with Slot Fillers