Proportional Pressure (4.1.7) - Grundfos Control DDD Montage- Und Betriebsanleitung

Setting range
• Activation and setting of event.
Fig. 51 Event 1
Setting via operating panel
• Settings > Primary controller > Clock program.
1. Enable the function in display 4.1.6.
2. Select and enable one of the ten events in displays 4.1.6.1 to
10.
3. Select: Normal or Stop.
(Skip step 4 if you select "Stop".)
4. Set the following:
• "Setpoint offset,remote sensors" for "Automatic adaptation"
mode
• "Setpoint, closed loop" for "Manual adaptation" mode and
"Disabled".
5. Set: Time: Hours, Minutes.
6. Select the day(s) of week on which the settings are to be
activated.
7. Press [Back].
8. Repeat steps 2 to 7 if several events are to be enabled. You
can set up to ten events.
Factory setting
The function is disabled.

8.7.9 Proportional pressure (4.1.7)

Fig. 52 Proportional pressure
Description
With this function the setpoint is automatically adapted to the
actual flow rate to compensate for flow-dependent dynamic
losses.
Proportional pressure works in two different ways, depending on
the selected operation mode. See below:
Disabled
Disable the function to maintain a constant pressure at the
pumping station.
If this function is disabled, data from remote sensors
will not be used.
Automatic adaptation
This function automatically optimises the proportional-pressure
curve using the logged pressure data from the remote sensors
and ensures a constant pressure at consumers or critical points.
The pressure at the pumping station will vary depending on the
usage-pattern at the critical points.
The system pressure is automatically adjusted when a change in
the water requirement is registered at the pumping station. The
controller ensures that a change of system characteristics at
critical points results in a changed curve characteristic based on
the logged data received daily from the remote sensors. The
system changes the proportional-pressure control curve by
maximum ± 0.2 bar per day to ensure stable pressure throughout
the system.
It may thus take several days for a change, for instance in the
water distribution network or consumption pattern, to take full
effect.
Set the required minimum pressure if automatic adaptation is
enabled. This will ensure a minimum outlet pressure at the
pumping station. See fig. 52.
Adaptation takes place within a given performance area
depending on the pump and system characteristics. See fig. 54.
Fig. 53 Simplified model of water distribution network
1
2
3
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