Allen-Bradley 1606-XLBRED20, Reference Manual, Page: 15 / 18

Rockwell Automation Publication 1606-RM111A-EN-P - July 2020 15
Use In a Tightly Sealed
Enclosure
When the redundancy module is installed in a tightly sealed enclosure, the
temperature inside the enclosure is higher than outside. The inside
temperature defines the ambient temperature for the redundancy module.
The following table shows values from an installation in a tightly sealed
enclosure. The power supply was placed in the middle of the box and no other
heat producer was inside the box.
Example: Redundancy for
Controls
In many cases, two power supplies are used, one for the demanding loads and
another for the controls and sensitive loads, as shown in
Figure 14 . With the
1606-XLBRED20 redundancy module, the power supply for the demanding
loads can be used as a redundant source to supply the controls, as shown in
Figure 15 . This provides a cost-effective solution to get redundant power for a
PLC or controller system.
Attributes Values and Descriptions
Enclosure
Rittal Typ IP66 Box PK 9516 100, plastic,
110 x 180 x 165 mm (4.33 x 7.09 x 6.50 in.)
Load 24V, 16 A; (=80%) load is placed outside the box
Input 2 x 24V DC, 8 A
Temperature inside enclosure
42.4 °C (108.32 °F) (in the middle of the right side of
the power supply with a distance of 2 cm [0.79 in.])
Temperature outside enclosure 23.1 °C (73.58 °F)
Temperature rise 19.3 K (34.74 °F)
Figure 14 - Non-redundant Load and Control System Figure 15 - Redundant Load and Control System
Load PS1
PLC
PS2
Load
PLC
PS1
PS2
RM