Example: Selecting A Cabinet - Siemens SIMATIC S7-300 Hardware And Installation Manual

Configuring
5.7

Example: Selecting a cabinet

Introduction
The sample below clearly shows the maximum permitted ambient air temperature
at a specific power loss for different cabinet designs.
Assembly
The following device configuration should be installed in a cabinet:
• 1 central device 150 W
• 2 expansion modules, each with 150 W
• 1 load power supply unit, 200 W under full load
This results in a total power loss of 650 W.
Power loss dissipated
The diagram in the figure below shows guide values for the permitted ambient air
temperature of a cabinet with the dimensions 600 mm x 600 mm x 2,000 mm,
depending on power loss. these values only apply if you maintain the specified
installation and clearance dimensions for racks (rails).
5-14
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02