30
NRR 2-52, NRR 2-53, URB 55 - Installation & Operating Manual -
850646-00
Wiring diagram - NRR 2-52 level controller
27
16 17 18 19 20 21 22 23 24 25 26
28 29 30
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
24
V DC
4-20 mA
+
H
L
S
–
M 0,5
A
+
–
4-20 mA
+
–
4-20 mA
+
–
1
3
+12 V
13 14
+
–
+
–
0 - 1K
Ω
–
+
MIN
CLOSED
S
upply voltage,
fuse provided by customer
M0.5A
Analogue input 2
for feedwater flowrate (optional)
Da
ta line
for URB 55
OPEN
MAX
Actual value output X
Display of valve position
(potentiometer 0 - 1000
W
)
OUT
MIN alarm
relay output
Control valve
actuation
MAX alarm
relay output
3 s
3 s
Digital input - alarm signal
for control centre *
Analogue input 3
for steam flowrate
(optional)
= shiel
d
NRG 21-xx / NRG 26-21
NRGT 26-x
Fig. 18
* Has no impact
on control
MIN alarm
