GE Industrial Solutions CPS6000 - Manual (Page 209)

CPS6000 –48V Indoor/Outdoor Power Shelf
Issue 21 January 2008
209
Appendix F: Operating Temperature
Measurement and
Vertical Spacing
Overview
The CPS6000 has been designed for mounting in relay racks or in equipment cabinets, where
-48Vdc with optional ringing power is required. It is designed for use with other equipment
that require 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.