Grundfos MAGNA3 Installation And Operating Instructions Manual page 16

5.5.2 Digital inputs
See fig. 12, pos. 2.
The digital input can be used for external control of start/stop or
forced max. or min. curve.
If no external on/off switch is connected, the jumper between
terminals Start/Stop (S/S) and frame ( ) should be maintained.
This connection is the factory setting.
M
M
A I
Start/stop
Fig. 14 Digital input
Contact symbol
M
A
M
I
S/S
External start/stop
The pump can be started or stopped via the digital input.
Start/stop
S/S
H
S/S
H
16
S/S
On/off timer
Function
Max. curve
100 % speed
Min. curve
25 % speed
Start/Stop
Frame connection
Normal duty
Note: Factory setting with
jumper between S/S and
Q
Stop
Q
External forced max. or min. curve
The pump can be forced to operate on the max. or min. curve via
the digital input.
M
H
A
M
H
A
M
H
I
M
H
I
Select the function of the digital input on the pump control panel
or with the Grundfos GO Remote.
5.5.3 Analog input
See fig. 12, pos. 3.
The analog input can be used for the connection of an external
sensor for measuring temperature, pressure, flow or other
parameter. See fig. 17.
It is possible to use sensor types with 0-10 V or 4-20 mA signal.
The analog input can also be used for an external signal for the
control from a BMS system or similar control system. See fig. 18.
• When the input is used for the heat energy meter, a
temperature sensor must be installed in the return pipe.
• If the pump is installed in the return pipe of the system, the
sensor must be installed 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, the
sensor must be installed in the return pipe.
• If the pump is installed in the return pipe of the system, the
built-in temperature sensor can be used.
.
Max. curve
Normal duty
Q
Max. curve
Q
Min. curve
Normal duty
Q
Min. curve
Q