18 Rockwell Automation Publication 1606-RM055A-EN-P - December 2016
Basic Power Supply 5 A
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 allowed as long as the supplying voltage is
below 240V
+10%
.
Figure 21 - Operation on Two Phases
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 such situations, the
inside temperature defines the ambient temperature for the power supply.
The following measurement results can be used as a reference to estimate the
temperature rise inside the enclosure.
The power supply is placed in the middle of the box; no other heat producing
items are inside the box.
•Enclosure
– Rittal Type IP66 Box PK 9516 100
–Plastic
– 110 x 180 x 165 mm (4.33 x 7.09 x 6.50 in)
•Input
– 230V AC
Attribute Case A Case B
Load
(1)
(1) Load is placed outside the box.
24V, 5 A 24V, 4 A (=80 %)
Temperature inside the box
(2)
(2) In the middle of the right side of the power supply with a distance of 1 cm.
41.5 °C (106.7 °F) 38.9 °C (102 °F)
Temperature outside the box 24.4 °C (75.9 °F) 24.2 °C (75.6 °F)
Temperature rise 17.1K 14.5K
240V
+10%
max.
Fuse
L2
L1
L3
L
N
PE
Power Supply
AC
DC
internal
fuse
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