Siemens SINAMICS G130 Operating Instructions Manual page 26

Cabinet design and emc

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Cabinet air conditioning

5.2 Ventilation

Figure 5-2

Devices must not be operated in an "air short circuit", since this can damage equipment or

cause it to fail.

The pull of the fan causes negative pressure to build up at the ventilation openings in the

cabinet doors. The pressure is dependent on the volume flow rate and the hydraulic cross-

section of the openings.

The air, which blows out of the top of the device, accumulates under the top cover/hood,

resulting in overpressure.

The difference between the overpressure at the top of the cabinet and the negative pressure

at the bottom creates a flow of air (air short circuit). This can vary in strength depending on

the cross-section of the door and cover openings, as well as the volume flow rate of the air.

Abluft

Air guidance for Power Module, frame size HX, JX

Cabinet design and EMC

Operating Instructions, 03/2013, A5E00427629A

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