Methods Of Ventilation - Siemens S7-400 Installation Manual

2.7

Methods of Ventilation

Methods of Ventilation
Under extreme ambient conditions, particularly when operating the S7-400
modules in cabinets, you can use the cable duct or fan subassembly to optimize
ventilation.
There are two methods of supplying air to the modules. You draw in air either from
the back or from below. The cable duct and fan subassembly can be converted for
this purpose.
The following figure shows the ventilation when air is drawn in from the back.
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
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Supply air
Exhaust air
Modules
Cable duct or fan
subassembly
Exhaust air
Modules
Installing the S7-400
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