12
NRS 2-50, NRS 2-51 - Installation & Operating Manual -
819179-05
In the control cabinet: Wiring the level switch
Wiring diagram for level switch NRS 2-51
5
Supply voltage connection
24 V DC
with 0.5A semi-delay fuse provided on site
6
Level electrode NRG 21-..; NRG 26-21
Max. three NRS/NRR 2-5.. units can be connected. (connection in parallel).
7
Level transmitter NRGT 26-., 4-20 mA, with shield connection in terminal box.
Max. three NRS/NRR 2-5.. units can be connected (series connection).
8
Central earthing point (CEP) in control cabinet
9
MIN output contact, off delay 3 seconds
0
MAX output contact, off delay 3 seconds
a
Pump output contact
b
Actual value output 4-20 mA
Key
5
7
9
8
a
0
6
NRS 2-51
Fig. 4
0.5A
(semi-
delay)
b
MIN
MIN
MAX
MAX
b
5
9
a
0
0.5A
(semi-
delay)
8
continued
