Grundfos Control MPC-Serie Installationsanleitung Seite 35

8.7.8 Secondary sensor (4.1.5)
Fig. 44 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
booster 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.
8.7.9 Clock program (4.1.6)
Fig. 45 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.
If the Multisensor function is enabled, it will have a
higher priority than the Clock program which will be
overruled.
Minimum two events are required when activating the
clock program: one to start the system and one to
stop the system.
Setting range
• Activation and setting of event.
Fig. 46 Event 1
Setting via the operating panel
• Settings > Primary controller > Clock program.
1. Enable the function.
2. Select and enable one of the ten events.
3. Select: Normal or Stop. Skip step 4 if you select "Stop".
4. Set: Setpoint, closed loop.
5. Set: Time, Hours, Minutes.
6. Select the day of week on which the settings are to be
activated.
7. Select: Enabled.
8. Repeat steps 2 to 7 if several events are to be enabled. Note:
Up to ten events can be set.
9. Press [Back].
10. Select: Enabled.
Factory setting
The function is disabled.
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