Grundfos Control MPC Montage- Und Betriebsanleitung Seite 35

8.6.8 Secondary sensor (4.1.5)
Secondary sensor
Description
The function is designed for optimising the constant-pressure
control, where there is a high dynamic friction loss. The function
enables the possibility of placing a primary sensor on the critical
point in the system.
The sensor needs to be hardwired back to the controller, and will
act as primary sensor hence utilising the normal Setpoint setting.
The Secondary sensor is then the "local" sensor placed on the
system manifold close to the control cabinet.
In case of a fault on the Primary sensor, the Secondary sensor
will automatically take over using its specified Setpoint. The
difference between the setpoint of the Primary sensor and the
Secondary sensor is equal to the total pressure losses between
the two sensors at maximum flow.
Setting range
• Enabled or Disabled function
1. Setting of analog input
2. Setting of Measured value from secondary sensor
3. Setting of Setpoint
Setting via the operating panel
• Settings > Primary controller > Secondary sensor
1. Enable the function.
2. Define the analog input used for Secondary sensor.
3. Define Measured value from secondary sensor.
4. Define Setpoint for Secondary sensor operation.
8.6.9 Clock program (4.1.6)
Clock program
Description
With the function, you can set setpoints and day and time for their
activation. You can also set day and time for stop of the system.
If the clock program is disabled, the setpoint of the program will
remain active.
Minimum two events are required when activating the
clock program: one to start the system and one to stop the
system.
If the Multisensor function is enabled, it will have a higher
priority than the Clock program which will be overruled.
Setting range
• Activation and setting of event.
Event 1
Setting via the operating panel
• Settings > Primary controller > Clock program.
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