Ambient Temperature - Beijer Electronics X2 control 12-B2 Installation Manual

NOTE
Ferrite cores that are snapped onto the shielded cabling may remove minor
disturbances. Large ferrite pieces that are snapped onto unshielded cabling and
where the wires go 2-4 times around the cores are approximately 5-25 times more
efficient.

7.4. Ambient Temperature

The maximum ambient temperature for the HMI panel is provided in the specifications. The ambient
temperature refers to the temperature in the device cabinet which cools the HMI panel's electronics.
Top
50 °C inside
Operator
Power
panel
Power
30 °C outside Middle
45 °C inside
Power
Bottom
40 °C inside
In most cases, the ambient temperature for the HMI panel is significantly 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 the cabinet is considerably higher than the temperature increase that would be expected. All
electronics are sensitive to heat. The lifespan of an electrolytic capacitor is cut in half with an 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
Installing a fan inside the cabinet evens out the temperature, while moving air provides considerably
better cooling than still air.
Install the fan so that it sits in a cooler area and blows cold air against the HMI panel. If the fan
is mounted at the top and sucks warm air upwards, the ambient temperature of the fan becomes
higher, resulting in a shorter lifespan.
An approximate value of the net power consumption for the HMI panel can be calculated by
multiplying the supply voltage with the current drawn by the HMI panel. This is assuming that all
supplied power is transformed to heat.
Beijer Electronics, MAEN223
Axial fan
120 x 120 mm
Airflow
2
per °C.
25
Additional Installation Tips
2023-09