Use in a tightly sealed enclosure
When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure is higher than outside. In this case, the temperature inside the enclosure is considered the ambient temperature for the power supply.
In the following test arrangement, the device is placed at the center of the enclosure, and there are no other heat-generating objects in the enclosure. The load is placed outside the box.
The temperature sensor inside the box is placed at the center of the right side of the power supply at a distance of 1 cm.
The following measurement results can be used as a reference to estimate the temperature rise within the enclosure.
| Case A | Case B |
|---|---|---|
Housing size | 180x180x165mm Rittal housing, protection class IP66 PK 9519 100, plastic | 180x180x165mm Rittal housing, protection class IP66 PK 9519 100, plastic |
Input voltage | 3x 400Vac | 3x 400Vac |
Load | 24V, 8A; (=80%) | 24V, 10A; (=100%) |
Temperature inside the housing | 48.4°C | 54.7C |
Temperature outside the housing | 24.5°C | 24.9°C |
Temperature increase | 23.9K | 29.8K |