Grundfos Control DDD Montage- Und Betriebsanleitung Seite 47

8.7.38 Control source (4.3.20)
Fig. 92 Control source
Description
The system can be remote-controlled via an external bus
connection (option). See section
8.8 Data communication.
Select the control source, that is either CU 354 or the external
bus connection.
Setting via operating panel
• Settings > Secondary functions > Stop function > Control
source.
Factory setting
The control source is CU 354.
8.7.39 Fixed inlet pressure (4.3.22)
Fig. 93 Fixed inlet pressure
Description
The function is only used when no inlet-pressure sensor is fitted
in the system and the inlet pressure is fixed and known.
If the pressurised system has a fixed inlet pressure, it can be
entered in this display so that CU 354 can optimise the
performance and control of the system.
Setting range
A fixed inlet pressure can be set, and the function can be enabled
or disabled.
Setting via operating panel
• Settings > Secondary functions > Fixed inlet pressure.
• Select: Enabled or Disabled.
• Set: Fixed inlet pressure.
Factory setting
The function is disabled.
8.8.2 GENIbus. See also section
8.7.40 Flow estimation (4.3.23)
Fig. 94 Flow estimation
The function is not used for DDD systems.
8.7.41 Reduced operation (4.3.24)
Fig. 95 Reduced operation
Description
The function allows you to limit the number of pumps in operation,
or in DDD-E/-EC systems, to limit power consumption. The limit is
activated by a digital input.
Setting range
• Setting of digital input (8.7.26 Digital inputs
• Setting of digital output (8.7.31 Digital outputs
• Maximum number of pumps in operation.
• Maximum power consumption.
Setting via operating panel
• Settings > Secondary functions > Reduced operation > Go to
setting of digital input.
1. Select digital input.
2. Select: Reduced operation.
3. Press [Back] x 2.
4. Select: Go to setting of digital output.
5. Select digital output.
6. Select: Reduced operation.
7. Press [Back] x 2.
8. Set: "Number of pumps in operation" or "Power consumption".
Factory setting
No digital input is selected (disabled).
(4.3.7)).
(4.3.9)).
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