Siemens Choosing and Setting up Cabinets with the S7-400, Why Cabinets are Required

Installing the S7-400

2.11Choosing and Setting up Cabinets with the S7-400

Why Cabinets are Required

With larger installations and in an environment subject to interference or pollution, you can install the S7-400 in cabinets. The requirements of UL/CSA are met, for example, by an installation in cabinets.

Types and Dimensions of Cabinets

Observe the following criteria when selecting cabinet types and their dimensions:

•Ambient conditions at the point of installation of the cabinet

•Required clearances for the racks

•Total power dissipation of components contained by the cabinet

The ambient conditions at the point of installation of the cabinet (temperature, humidity, dust, effects of chemicals, explosion hazard) govern the required degree of protection of the cabinet (IP xx). Further information on degrees of protection can be found in IEC 529 and DIN 40050.

Automation System S7-400	Hardware and Installation	2-25
A5E00850741-01