Application notes
PS1061-2410-0000
30
Version: 1.0
4.5
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 240 V+10 %.
Fig. 15: Operation on two phases
Make sure that the conductor connected to the N terminal is fused appropriately.
The maximum permissible voltage between one phase and the PE must be below 300 Vac.
4.6
Use in a tightly sealed enclosure
When the power supply is installed in a tightly sealed enclosure, the temperature inside the housing is higher
than outside. In this case, the temperature inside the housing is considered the ambient temperature for the
power supply.
The power supply is positioned at the center of the housing. There are no other heat-generating elements in
the housing
The temperature sensor in the housing is positioned at the center on the right side of the power supply with a
distance of 1 cm.
The following measurement results can be used as reference for estimating the temperature rise inside the
housing.
Case A
Case B
Housing size
180 mm x 180 mm x 165 mm
Housing Rittal, protection class
IP66 PK 9519 100, plastic
180 mm x 180 mm x 165 mm
Housing Rittal, protection class
IP66 PK 9519 100, plastic
Input voltage
230 Vac
230 Vac
Load
24 V, 8 A; (=
80 %
)
24 V, 10 A; (=
100 %
)
Temperature inside the housing
45.3 °C
50.2 °C
Temperature outside the housing
21.0 °C
21.0 °C
Temperature increase
24.3 K
29.2 K
