Dimensioning Climate Control Equipment - Siemens Sinamics S120 Manual

Cabinet design and EMC Booksize
12.12 Notes on electrical cabinet cooling
Measures for remaining within temperature limits
1. One or more fans should be installed.
2. If necessary, the drive line-up can be operated with derating.
12.12.5

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.
q = Q - k x A x ΔT
Formula to calculate the power loss
q = thermal power that has to be dissipated through a cooling unit [W]
Q = power loss [W]
∆T = temperature difference between the room and cabinet interior [K]
k = thermal resistance coefficient [W / (m
* K))
A = free-standing cabinet surface area [m
Table 12- 31 Example, calculating the power loss of a drive configuration
Component
CU320-2
Basic Line Filter for AIM / ALM 36
kW
Active Interface Module
Active Line Module 36 kW
Motor Module 18 A
Motor Module 30 A
SMC
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 = 2469.4 W - 5.5 W / (m
780
Quantity Total power loss [W]
(including electronic losses)
1 24
1 26
1 340
1 666
2 185.4
3 309.2
5 10
1 53
1 12
K) * 5 m
2 2
* K)] (example: Painted sheet steel k = 5.5 W / (m
2
]
2
2
* 10 K = 2194.4 W
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
Total power loss [W]
24
26
340
666
370.8
927.6
50
53
12
2469.4
Booksize Power Units
2