Positioning The Pressure Sensor - Grundfos CU 301 Instrucciones De Instalacion Y Operacion

Pressure sensor
DANGER
Electric shock
Death or serious personal injury
- The total load of terminal 5, +24 VDC,
must not exceed 100 mA.
SENSOR, terminals 5, 6 and 7:
Terminals 5, 6 and 7 (SENSOR) are used for the
pressure sensor.
Sensor signals:
The sensor to be connected must give signals within
one of the following ranges:
• 0-10 V
• 2-10 V
• 0-20 mA
• 4-20 mA, factory default.
Changeover between current and voltage signals is
carried out by means of Grundfos GO Remote.
Operating relay
RELAY, terminals 8 and 9:
Terminals 8 and 9 (RELAY) are used for the
connection of an external signal transmitter (sound
or light).
The operating relay is a normally open (NO) contact
when the pump is not running, and closes while the
pump is running.
• Maximum current: 0.5 A
• Maximum voltage: 230 VAC.
POWER PUMP
PE
PE
Fig. 3 Electrical connection of the operating
relay
RM85-3021-25-1024
DC 24 V
AC 250 V 16 A
8 5
7 4
1 2
MADE IN POLAND
4080
RM85-3021-25-1024
DC 24 V
AC 250 V 16 A
8 5
7 4
1 2
MADE IN POLAND
4080

3.3 Positioning the pressure sensor

Pressure losses often cause inconvenience. CU 301
keeps the pressure constant in the place where the
pressure sensor is positioned. See fig. 4.
Fig. 4 Pressure sensor position
We recommend that the pressure sensor is
positioned as close to the point of use as possible.
Pressure sensor
Tap 2
Tap 1
7