Grundfos CU 362 Instrucciones De Instalación Y Funcionamiento página 10

4.4.2 Two pumps with five float switches
Figure Two pumps with five float switches
used as safety float switches, i.e. for high level (DI2, CU 362) and for dry running (DI1, CU 362). The last three float switches are used to start
and stop the pumps, i.e. "Start 1" (DI9, IO 351B), "Start 2" (DI8, IO 351B) and "Stop" (DI3, CU 362). A pressure sensor (AI2, CU 362) has
been installed in the discharge line close to the pipe junction.
Two pumps with five float switches
Float switch Unit/module
Float switch 5 CU 362
Float switch 4 IO 351B-1
Float switch 3 IO 351B-1
Float switch 2 CU 362
Float switch 1 CU 362
Sensor Unit
Pressure sensor CU 362
10
shows an example of a two-pump installation controlled by five float switches. Two float switches are
DI
AI
CU 362
AO
DO
Signal (terminal)
DI2 (12), GND (13)
DI8 (44), GND (47)
DI9 (46), GND (47)
DI3 (14), GND (13)
DI1 (10), GND (11)
Signal (terminal)
AI2 (54), +24 V (50), GND (58)
AI2 (54), +24 V (50), GND (58)
DI2 (12), GND (13)
DI8 (44), GND (47)
DI9 (46), GND (47)
DI3 (14), GND (13)
DI1 (10), GND (11)
Description
High level
Start 2
Start 1
Stop
Dry running
Description
Discharge pressure measurement