Siemens S5-135U/155U appendix Examples for Determining the Type of Cabinet, Cabinet Design

Installation Guidelines

!

Caution

Modules with a hard disk drive can only be used at an ambient temperature of up to 50 °C.

3.7.4Examples for Determining the Type of Cabinet

The following example shows the maximum permissible ambient temperature with various cabinet types and the same power dissipation.

Example

The following equipment configuration is given:

1	Central controller	200 W
2	Expansion units, 250 W power dissipation each	500 W
1	Load PS, 24 V/40 A, 6EV1 362-5BK00 (full load)	200 W
	Total power disspation	900 W

From Figure 3-16, with a total power dissipation of 900 W, the maximum ambient temperatures given by the table are as follows:

Cabinet Design

Closed, with natural convection and forced circulation (Curve 3)

Open with through-ventilation (Curve 2)

Closed, with heat exchanger (Curve 1)

Max. Permissible Ambient Temperature

(Operation not possible)

Approx. 33 °C

Approx. 42 °C

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