Installing the S7-400

Table 2-1 provides an overview of the most common types of cabinet. You will also find the principle of heat removal, as well as the estimated, maximum achievable power loss removal and the degree of protection.

Table 2-1 Cabinet types

Open Cabinets

Closed Cabinets

 

 

 

 

 

Through-ventilatio

Increased

Natural convection Forced circulation

Forced circulation

n by natural

through-ventilation

using fan

using heat

convection

 

subassembly,

exchanger,

 

 

enhanced natural

external ventilation

 

 

convection

inside and outside

Heat removal

Increased heat

Heat removal only

Heat removal only

Heat removal

primarily by natural

removal through

through the

through the

through exchange

thermal

increased air

cabinet wall; only

cabinet wall.

between heated

convection, small

movement

low power

Forced ventilation

internal air and

portion via the

 

dissipation

of the internal air

cold external air.

cabinet wall

 

permissible. Heat

results in improved

The increased

 

 

accumulation

heat removal and

surface of the

 

 

usually occurs in

prevention of heat

folded-area

 

 

the top of the

accumulation.

sectional wall of

 

 

cabinet.

 

the heat

 

 

 

 

exchanger and

 

 

 

 

forced circulation

 

 

 

 

of internal and

 

 

 

 

external air permit

 

 

 

 

good heat output.

 

 

 

 

 

Degree of

Degree of

Degree of

Degree of

Degree of

protection IP 20

protection IP 20

protection IP 54

protection IP 54

protection IP 54

Typical removable power dissipation under the following boundary conditions:

Cabinet size 2200 x 600 x 600 mm

Difference between external and internal temperature of the cabinet: 20° C (for other temperature differences, you must refer to the temperature characteristics of the cabinet manufacturer)

up to 700 W

up to 2700 W (1400 W with very fine filter)

up to 260 W

up to 360 W

up to 1700 W

2-26

Automation System S7-400

Hardware and Installation

 

A5E00850741-01

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Siemens S7-400 installation manual Open Cabinets Closed Cabinets