Appendix: system overview of RN Series
RN22
28
Hauser
Device (24 V
DC
)
Current consumption per device
(mA)
Number of devices
Total current consumption
(mA)
RN22 signal doubler
100
0
0
RLN22 1-channel
21
0
0
RLN22 2-channel
35
3
105
RNO22 1-channel
45
0
0
RNO22 2-channel
85
0
0
Imax: 400 mA
7
385
The total current consumption of 385 mA is less than the maximum permitted current of
400 mA. The fuse to be connected in series upstream from the power-supplying isolating
amplifier should have a maximum rated current of 500 mA. To guarantee that the fuse
trips in the event of a short-circuit, the 24 V
DC
power is supplied in this example by an
RNB22 power supply of 24 V
DC
2.5 A.
With this type of power feed-in, it is important to note that the maximum number of
devices is very limited and that short-circuit and line break detection is not possible. Short-
circuit and line break detection is provided by the power supply solution described in the
next section.
13.1.4 Power supply via RNF22 power and error message module
This version is particularly well suited for a larger number of isolating amplifiers mounted
side by side, e.g. in new installations. In addition, error monitoring can be implemented
with this solution.
1.1 1.2
2.1 2.2
3.1 3.2 3.3
1.1 1.2
3.1 3.2
4.1 4.2
1.1 1.2
2.1 2.2
3.1 3.2
4.1 4.2
1.1 1.2
2.1 2.2
3.1 3.2
4.1 4.2
1.1 1.2
3.1 3.2
4.1 4.2
5.1 5.2
1.1 1.2
2.1 2.2
3.1 3.2
4.1 4.2
5.1 5.2
1.1 1.2
2.1 2.2
3.1 3.2
4.1 4.2
5.1 5.2
6.1 6.2
1.1 1.2
2.1 2.2
3.1 3.2
4.1 4.2
5.1 5.2
A0045543
13
Power supply via RNF22 power and error message module
At a glance
• 24 V
DC
power supply available in the cabinet
• Maximum current consumption of connected RN devices (total current consumption
Imax < 3.75 A)
• Redundant power feed-in possible via two power supplies
• Group error message, line or short-circuit monitoring of side-by-side RLN22 NAMUR
isolating amplifiers
RNF22 power modules are particularly suitable for supplying power to RNx22 devices.
Here, a total current of 3.75 A can be realized. These modules also offer the additional
advantage of integrated error evaluation. A power supply failure or fuse error is signaled
by a relay contact and indicated by a flashing LED. The power feed-in can be redundant if
required. The diodes integrated in the device ensure the separation of the power supplies
used for power feed-in. In addition, mechanical redundancy is also possible by using two
power supply terminals. The power supply terminal(s) are each fused by an integrated 5 A
fuse.