Cooling Air Requirements And Air Opening Cross-Sections In The Cabinet - Siemens SINAMICS G130 Engineering Manual

3.6.3

Cooling air requirements and air opening cross-sections in the cabinet

The air-cooled SINAMICS G130 Chassis units and the air-cooled SINAMICS S120 units in Chassis format are forced
ventilated by integrated fans. The cooling air requirement of the units is dependent on the frame size and the output
power rating (power losses of the power section). For this reason, the air flow rate of the fans and the number of
integrated fans varies according to the frame size. In the case of power units comprising more than one power block
(frame sizes HX and JX), each power block has its own fan. When units of Chassis format are mounted inside a
cabinet, the cabinet must be provided with appropriately designed air inlet and air outlet openings of the correct
cross-section to ensure a cooling air flow sufficient to provide the required cooling effect.
To comply with the requirements of high degrees of protection, e.g. IP20 or higher, the air openings in the cabinet
must take the shape of a grid. This means that the total cross-section of the opening comprises the sum of a very
large number of small cross-sections. In order to prevent these openings from presenting excessive flow resistance
and pressure drop, the minimum cross-sectional area of each individual opening must be of the order of
²
approximately 190 mm (e.g. 7.5 mm x 25 mm or 9.5 mm x 20 mm). These boundary conditions must be fulfilled in
order to ensure that the effective flow cross-section per opening is approximately equivalent to the geometric cross-
section of the opening. This allows the total cross-section of the opening to be calculated from the sum of individual
cross-sections without necessitating the inclusion of any reduction factors.
The table below specifies the minimum required total opening cross-sections in the cabinet for cooling individual
SINAMICS power units. The total opening cross-sections given in the table refer in each case to a single power unit.
If more than one power unit is mounted in a cabinet, the total opening cross-section must be increased accordingly. If
the required openings cannot be provided in a single cabinet, the power units must be distributed among several
cabinets which must then be seperated by vertical partitions.
Air-cooled SINAMICS
drive component
SINAMICS S120 Chassis
Basic Line Modules
§ Frame size FB
§ Frame size GB
Smart Line Modules
§ Frame size GX
§ Frame size HX
§ Frame size JX
Active Interface Modules
§ Frame size FI
§ Frame size GI
§ Frame size HI/ JI
Active Line Modules
§ Frame size FX
Frame size GX
§
§ Frame size HX
§ Frame size JX
General Engineering Information for SINAMICS
Rated power
(air-cooled)
200-400kW at 400V;
250-560kW at 690V
560-710kW at 400V;
900-1100kW at 690V
250-355kW at 400V;
450kW at 690V
500kW at 400V;
710kW at 690V
630-800kW at 400V;
1000-1400kW at 690V
132-160kW at 400V
235-300kW at 400V
380-900kW at 400V;
630-1400kW at 690V
132kW at 400V
160kW at 400V;
235-300kW at 400V
380-500kW at 400V;
630kW at 690V
630-900kW at 400V;
800-1400kW at 690V
Engineering Information
Cooling air Minimum opening cross-section in cabinet
requirement
Inlet opening
(bottom)
³
[m /s]
0.17
0.36
0.36
0.78
1.08
0.24
0.47
0.4
0.17
0.23
0.36
0.78
1.08
SINAMICS Engineering Manual – November 2015
Outlet opening
(top)
² ²
[m ] [m ]
0.1 0.1
0.19 0.19
0.19 0.19
0.28 0.28
0.38 0.38
0.1 0.1
0.25 0.25
0.2 0.2
0.1 0.1
0.1 0.1
0.19 0.19
0.28 0.28
0.38 0.38
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Ó Siemens AG