Endress+Hauser RN22, Руководство по эксплуатации, Страница: 29 / 40

RN22 Appendix: system overview of RN Series
Hauser 29
Irrespective of whether you are using one or two RNF22 power modules, you can calculate
the maximum number of devices using the following formula and the information in the
Brief Operating Instructions:
n
modules
= I
max
/I
N
= (3.75 A)/I
N
I
N
= n
1
· I
module1
+ n
2
· I
module2
+ ...
If power feed-in is via the RNF22 power modules, power can be supplied by a single
RNB22 power supply. Alternatively, redundant power feed-in by two different power
supplies is also possible.
13.1.5 Power supply via the RNB22 system power supply and RNF22
power module (redundant)
The advantage of this version with power feed-in to the DIN rail bus connector is that a
24 V
DC
power supply does not have to be available in the cabinet. This type of power feed-
in is the best solution particularly for decentralized applications where only 230 V
AC
is
available.
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
PWR IN PWR IN
A0045544
 14 Power supply via "optional redundant" RNB22 system power supply and RNF22 power module
At a glance
• Single or redundant power feed-in via two RNB22 (2.5 A) power supplies and one
RNF22 power module
• Redundancy with total load up to 2.5 A (at 60 °C ambient temperature)
• Maximum load 3.75 A via RNF22 power module
• Can be used if 24 V
DC
power supply is not available in cabinet
• Group error message, line or short-circuit monitoring of side-by-side RLN22 NAMUR
isolating amplifiers
Power feed-in via the RNF22 power and error message module can be via one RNB22
system power supply, or via two RNB22 system power supplies (redundant configuration).
In this case it is important that both power circuits of the RNB22 are separately fused.
With this type of power supply, a maximum of 3.75 A can be fed into the DIN rail bus
connector.
Example: power feed-in via redundant RNB22 system power supply and one RNF22
power module
You wish to supply power to 15 RN22 active barriers (1-channel), 5 RN22 active barriers
(2-channel), 3 RN22 signal doublers, 12 RLN22 NAMUR isolating amplifiers (1-channel)
and 5 RNO22 output isolating amplifiers (1-channel) with an operating voltage of 24 V
DC
.
First consult the Brief Operating Instructions to determine the current consumption of the
devices. For the intrinsically safe RN22 active barriers this is 70 mA (1-channel), 130 mA
(2-channel) and 100 mA (signal doubler) per device, and 21 mA in the case of the RLN22
NAMUR isolating amplifiers (1-channel). The RNO22 output isolating amplifiers (1-
channel) each require 45 mA.