User Guide

English (US)
38
8.11.4 Analog input
See fig. 40, pos. 3.
You can use the analog input for the connection of an external
sensor for measuring temperature or pressure. See fig. 51.
You can use sensor types with 0-10 V or 4-20 mA signal.
You can also use the analog input for an external signal for the
control from a building management system or similar control
system. See fig. 52.
• When the input is used for the heat energy monitor, install a
temperature sensor in the return pipe.
• If the pump is installed in the return pipe of the system, install
the sensor in the flow pipe.
• If the constant-temperature control mode has been enabled
and the pump is installed in the flow pipe of the system, install
the sensor in the return pipe.
• If the pump is installed in the return pipe of the system, you
can use the internal temperature sensor.
You can change the sensor type, 0-10 V or 4-20 mA, on the
operating panel or with Grundfos GO.
Fig. 49 Analog input for external sensor, 0-10 V
Fig. 50 Analog input for external sensor, 4-20 mA
In order to optimize the pump performance, you can use external
sensors in the following cases:
Fig. 51 Examples of external sensors
For further details, see section 13.4 External sensors.
Fig. 52 Examples of external signal for the control via BMS or
PLC
Analog input on twin-head pumps
For redundancy purposes, the analog input can be used
concurrently on the slave pump head. As long as the master is
powered up, the input on the slave will be ignored. However, in
the event of power loss on the master, the analog input of the
slave will take over. When the master pump head is back on, the
master takes over and controls the system.
TM05 3221 0612TM05 2948 0612
Function or control mode Sensor type
Heat energy monitor Temperature sensor
Constant temperature Temperature sensor
Proportional pressure Pressure sensor
signal
sensor
Vcc
24V
I N
signal
sensor
Vcc
24V
I N
signal
sensor
Vcc
I
24V
I N
TM06 7237 3416
Pos. Sensor type
1
Combined temperature and pressure sensor,
Grundfos type RPI T2.
1/2" connection and 4-20 mA signal.
2
Pressure sensor, Grundfos type RPI.
1/2" connection and 4-20 mA signal.
TM05 2888 0612
24V IN
Vcc
Signal
1
2
24V
BMS
PLC