Power Consumption And Heat Dissipation; Maximum Heat Dissipation; Thermal Loading Limitations - ADC PG-PLUS PLL-722 Manual

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Table of Contents

SCP-PLL722-010-04H

OWER

ONSUMPTION AND

The three most important power demands of an COLU on the shelf power supply are its maximum power

consumption, its maximum heat dissipation, and its maximum current drain.

and heat dissipation for the COLU, on a per slot and per shelf basis.

Maximum Heat Dissipation

The maximum heat dissipation measures the power converted into heat that is built up within the COLU. It

contributes to the total heat generated in the space around the COLU. It is used to determine the maximum number

of fully loaded COTS per bay that will not exceed the maximum allowable power dissipation density in

Watts per square foot.

In CO locations, the Maximum Heat Dissipation for open faced, natural convection-cooled mountings is limited

to 134.7 W per square foot as per Section 4.1.4 of the NEBS standard GR-63-CORE. The footprint of a standard

16-slot, 23-inch COTS is 7.042 square foot. The maximum bay dissipation is therefore limited to 948.6 W. At

80 W per COTS, this limits the number of fully loaded COTS to eleven per bay with a heat baffle above each

COTS.

This is a worst case situation in that it assumes the entire CO is subjected to the maximum power density.

Conditions other than worst case would permit increasing the number of COTS per bay without

jeopardizing the CO thermal integrity. Due to the chimney effect, ADC recommends you install one

heat-dissipating baffle between every COTS. This action would prevent exceeding the rated operating

temperature of the COLU units.

Thermal Loading Limitations

The thermal loading limitations imposed when using the COLU in a CEV or other enclosures are determined by

applying the COLU power parameters to the manufacturer's requirements for each specific housing.

PLL-722 List 1

EAT

Table 1.