Beijer-electronics iX T12C EN Manual de usuario descargar pdf (Pagina 29)

Additional Installation Tips

7.4 AmbientTemperature

The maximum ambient temperature for the operator panel is provided in the

speciﬁcations. The ambient temperature refers to the temperature in the device

cabinet which cools the operator panel’s electronics.

Operator

panel

Power

30 °C outside

To p

50 °C inside

Bottom

40 °C inside

Middle

45 °C inside

Airflow

Axial fan

120 x 120 mm

Inmostcases,theambienttemperaturefortheoperatorpanelissigniﬁcantly

higher than the device cabinet’s ambient temperature.

If the cabinet is tall and there are a number of heat-generating devices, the

temperature at the top of t he cabinet will be considerably higher than the

theoretical temperature increase th at would be expected. All electronics are

sensitivetoheat. Thelifespanofanelectrolyticcapacitoriscutinhalfwithan

8-10 °C increase in temperature. A 15-20 °C temperature increase results in a

quarter of the lifespan etc.

Rittal has a good program for estimating the anticipated average temperature in

the cabinet as well as a large program for controlling the temperature in the device

cabinet.

An enamel-coated steel cabinet has a radiant heat value of 5.5 W/m

and degrees

Installing a fan inside the cabinet will even out the temperature, while moving air

provides considerably better cooling than still air.

Install the fan so that it sits in the cooler area and blows cold air against the operator

panel. If the fan is mounted at the top and sucks warm air upwards, the fan’s

ambient temperature will be higher, resulting in a shorter lifespan.

The operator panel’s loss effect = supply voltage x c urrent. Virtually no power goes

to external users and no loss effects due to inputs.

BeijerElectronics, MAEN082D

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Beijer-electronics iX T12C EN Manual de usuario Pagina 29