Grundfos magna3 - MAGNA3 Performance Range; MAGNA3 D Single-Head Performance

3
Analog input
Building
Management
System/PLC
p
Building
Management
System/PLC
Function of analog input
Dierential pressure
Constant temperature
Constant curve
Constant pressure
Proportional pressure
External setpoint inuence
External sensor feedback
Example: Linear with min.
If the local setpoint is set at 4 m (100 % reference) and
the external signal input has a maximum value (10
V or 20 mA), the resulting setpoint will be 4 m. If the
signal input is reduced by 50 %, the resulting setpoint
changes accordingly in a linear manner.
From factory, the internal temperature
sensor is used for feedback.
Heat energy monitor
Di. temperature
Is automatically activated if an external
temperature sensor is installed.
This function can be used in the following control modes:
Controller settings (Kp and Ti)
From factory, the analog input function is tailored to a generic heating
system with a predened pipe length and sensor position in the system.
We recommend to use the wizard under “Assist" ”Setup, analog input”
if these predened settings are not applicable.
These operating modes are designed for the
connection of an external sensor:
Monitor the resulting setpoint under ”Status” ”Pump
performance”.
3
5
SETTINGS
The most commonly used
control mode for external
setpoint function.
5
Min.
Max.
V
1020
H
Signal input
Resulting setpoint
”Linear with min.” and ”Linear with stop”
The input signal range is between 0 and 100 % and is inuenced linearly. In ”Linear with stop”,
the pump stops if the input signal is below 10 %. If the input signal increases above 15 %, the
pump starts operating again. In ”Linear with min.”, the pump runs on the minimum curve
when the signal input is below 20 %.
The pump’s resulting setpoint will be a combination of two factors:
• The locally given setpoint, which is 100 % reference to the signal input.
• The external signal input (0-10 V or 4-20 mA).