Siemens S7-400 installation manual Open Cabinets Closed Cabinets

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