Dimensioning Climate Control Equipment - Siemens SINAMICS S120 Equipment Manual

Cabinet Configuration and EMC Booksize
8.7 Information about cabinet cooling
8.7.4

Dimensioning Climate Control Equipment

Cabinet manufacturers provide calculation programs for selecting climate control equipment.
It is always necessary to know the power loss of the components and equipment installed in
the cabinet.
The physical relationship is shown in the following example.
Figure 8-20
q = thermal power that has to be dissipated through a cooling unit [W / K]
Q = power loss [W]
∆T = temperature difference between the room and cabinet interior [K]
k = thermal resistance value, e.g. sheet-steel, painted 5.5 [W / (m
A = free-standing cabinet surface area [m
Table 8-18 Example, calculating the power loss of a drive configuration
Component
CU320
Line Filters
Line reactor
Active line module 36 kW
Motor module 18 A
Motor module 30 A
Encoders
SITOP 20
Line Contactor
Total:
Assumption:
Free-standing cabinet surface area A = 5 m
Temperature difference between the room and cabinet interior ∆T = 10 K
q = (2415 [W] / 10 [Κ]) - 5.5 [W / (m
8-42
Formula to calculate the power loss
Number
1
1
1
1
2
3
5
1
1
]
2
Power loss [W]
20
90
250
666
165
290
10
53
12
2
* K)] * 5 [m ] = 214 [W/K]
2 2
Equipment Manual for Booksize Power Units
Equipment Manual, (GH2), 03/2006 Edition, 6SL3097-2AC00-0BP3
* K)]
2
Total power loss [W]
20
90
250
666
330
870
50
53
12
2,341