Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 31
Install the Dynamix 1444 Series Monitoring System Chapter 2
An estimate can be made of total internal power dissipation within the
enclosure. This estimate is based on maximum current load models, including
internal module power dissipation of its DC power and externally connected
power sources. This estimate can provide guidance to select an enclosure or
plan for required temperature control measures inside your enclosure.
Together with known (maximum) system heat dissipation from all used
components that are planned for your enclosure, the following approximate
equations. They are based on the use of no active method of heat dissipation
control (like fans or air conditioning). The equations can be used to calculate
either cooling surface requirement for enclosure and/or internal cabinet
temperature rise.
The system components are designed for internal enclosure surrounding air
temperatures of up to a maximum of 70 °C (158 °F) (measured 1 inch below
the main module). These designs are based on natural convection cooling and
specified air space clearances around the Dynamix 1444 series system.
Outcome of calculations can show that it is more efficient to provide a means
of cooling rather than increase cabinet size. Contact your cabinet manufacturer
for options available to cool your cabinet.
Module Type Maximum Power Dissipation
Main 9.0 W
Relay 2.3 W
4…20 mA 3.6 W
Tacho Signal Conditioning 3.0 W
Metric English
Where:
• T is the temperature difference between inside air
and outside ambient (
°C)
• Q is heat that is generated in enclosure (W)
• A is enclosure surface area (m2)
The exterior surface of all six sides of an enclosure is
calculated as follows.
A = 2dw + 2dh +2wh
Where d (depth), w (width) and h (height) are in meters.
Where:
• T is the temperature difference between inside air
and outside ambient (
o
F)
• Q is heat that is generated in enclosure (W)
• A is enclosure surface area (ft2)
The exterior surface of all six sides of an enclosure is
calculated as follows.
A = (2dw + 2dh +2wh)/144
Where d (depth), w (width) and h (height) are in inches.
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