Application notes
PS2001-4810-0000
34
Version: 1.0
4.6
Operation on two phases
The power supply can also be used on two phases of a three-phase system. Such a phase-to-phase
connection is permissible as long as the supply voltage is below 240V+10%.
Fig. 23: Operation on two phases
Make sure that the connection cable connected to the N terminal is fused appropriately.
The maximum permissible voltage between one phase and the PE must be below 300Vac.
4.7
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 box, and there are no other heat-
generating objects in the box. The load is placed outside the enclosure.
The temperature sensor inside the enclosure 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
230Vac
230Vac
Load
48V, 8A; (=
80%
)
48V, 10A; (=
100%
)
Temperature inside
the housing
45.7°C
50.6°C
Temperature outside
the housing
24.6°C
25.6°C
Temperature
increase
21.1K
25.0K
4.8
Installation positions
Installation positions other than the input connections at the bottom and the output at the top require a
reduction of the continuous output power or a limitation of the maximum permissible ambient temperature.
The values for service life and MTBF given in this data sheet are only valid for the standard mounting
orientation.
