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Appendix F: Operating Temperature Measurement and
Vertical Spacing
Overview
The CPS6000 has been designed for mounting in relay racks or in equipment cabinets, where
-48V
with optional ringing power is required. It is designed for use with other equipment that require
dc
vertical airflow cooling. Equipment may be placed on top of the CPS6000 provided airflow is not
impeded or sufficient spacing is provided.
Vertical Spacing
To prevent airflow from being impeded when placed above or below a solid surface, ensure that 1U
(1.75-inch) spacing is provided to allow for vertical airflow through the unit. If a solid surface is installed
on both vertical locations, then 1U must be provided on both surfaces.
Operating Temperature
When installing CPS Shelves, it is important to determine that airflow to the rectifier will be within their
operating limits. Rectifiers that operate at 75°C must see air intake with temperatures less than or
equal to 75°C at the rectifier inlet. When using a dual or multi-shelf arrangement, the ambient intake to
the lower-most shelf and the heat gain through the shelf shall be considered while determining the air
intake temperatures of the subsequent shelves. If the air temperature is exceeding the operating
range, a baffle will have to be used.
Baffles
In conditions where the exhaust temperature of the lower shelf exceeds the operating temperature of
the next shelf, a 1U baffle shall be used to vent the exhaust and draw direct cabinet air. The cabinet air
temperature for the upper shelf should be within the operating range of the rectifiers.
A baffle shall also be used when the rectifier shelves are mounted below a distribution module or any
module where cables are being stripped and terminated. This protects the rectifiers from direct
exposure to metallic shavings and strips, and also directs the hot exhaust air away from the
distribution module.
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