Soft Pressure Build-Up (4.3.3) - Grundfos Control DDD Montage- Und Betriebsanleitung

Factory setting
The function is disabled.

8.7.24 Soft pressure build-up (4.3.3)

Fig. 74 Soft pressure build-up
Description
The function ensures a smooth startup of systems with for
instance empty pipes.
Startup takes place in two phases. See fig. 75.
1. Filling phase
The pipes are slowly filled with water. When the pressure
sensor of the system detects that the pipes have been filled,
phase two begins.
2. Pressure build-up phase
The system pressure is increased until the setpoint is
reached. The pressure buildup takes place over a ramp time.
If the setpoint is not reached within a given time, a warning or
an alarm can be given, and the pumps can be stopped at the
same time.
H [m]
1. Filling phase
Filling time
Fig. 75 Filling and pressure buildup phases
Setting range
• pump speed
• number of pumps
• filling pressure
• maximum filling time
• warning or alarm + stop
• ramp time for the pressure buildup phase.
Setting via operating panel
• Settings > Secondary functions > Stop function > Soft
pressure build-up.
1. Select and set:
• Speed
• Number of pumps
40
2. Pressure build-up
phase
Time [s]
Ramp time
• Filling pressure
• Max. time.
2. Select: Warning or Alarm + stop.
3. Set: Ramp time.
4. Select: Enabled.
Factory setting
The function is disabled.
8.7.25 Emergency run (4.3.5)
Fig. 76 Emergency run
Description
If enabled, this function will keep the pumps running regardless of
warnings or alarms. The pumps run according to a setpoint set
specifically for this function.
In case of sensor fault, both main and standby
pumps will run at 100 % speed.
Setting range
• Setting of digital input (8.7.26 Digital inputs
• Setting of digital output (8.7.31 Digital outputs
• Setting of setpoint for Emergency run.
Setting via operating panel
• Settings > Secondary functions > Stop function > Emergency
run > Go to setting of digital input.
1. Select digital input.
2. Select: Emergency run.
3. [Back] x 2.
4. Select: Go to setting of digital output.
5. Select digital output.
6. Select: Emergency run.
7. [Back] x 2.
8. Set: Setpoint, emergency run.
When this function has been set as described above,
you can also enable it via the display
operating mode (2.1.1).
(4.3.7)).
(4.3.9)).
System