Soft Pressure Build-Up (4.3.3) - Grundfos CONTROL MPC Installation And Operating Instructions Manual

System with flow switch
Make the following additional settings:
1. Mark Go to setting of digital input with
press . Now the display Digital inputs (4.3.7) appears.
2. Select the digital input where the flow switch is connected with
or , and press
3. Mark Flow switch with
.
An open contact indicates low flow.
Note
System with flowmeter
Make the following additional settings:
1. Mark Go to setting of analog input with
press . Now the display Analog inputs (4.3.8) appears.
2. Select the analog input where the flowmeter is connected, and
set up the input for the flowmeter by selecting Flow rate.
3. Return to Stop function by pressing
4. Mark Stop limit with
5. Set the value with or
Factory setting
The function is activated in booster applications with the settings
in the table.
On/off band: 25 %
Min. flow rate: 30 % of the nominal flow rate of one pump
The function is deactivated in all other applications.

11.7.24 Soft pressure build-up (4.3.3)

Fig. 64 Soft pressure build-up
Description
This function is typically used in booster applications and ensures
a smooth start-up of systems with for instance empty pipes.
Start-up takes place in two phases. See fig. 65.
1. Filling phase.
The pipework is slowly filled with water. When the pressure
sensor of the system detects that the pipework has been filled,
phase two begins.
2. Pressure build-up phase.
The system pressure is increased until the setpoint is
reached. The pressure build-up 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.
or , and
.
or , press and return with
or , and
twice.
or .
, and save with .
H [m]
1. Filling phase
Filling time
Fig. 65 Filling and pressure build-up phases
Setting range
• Activation of the function.
• Setting of pump speed.
• Setting of number of pumps.
• Setting of filling pressure.
• Setting of maximum filling time.
• Setting of warning or alarm + stop.
• Setting of ramp time for the pressure build-up phase.
Setting via control panel
1. Mark the Settings menu with
2. Mark Secondary functions with
3. Mark Soft pressure build-up with
.
4. Mark Speed with or
5. Set the value with or
6. Mark Number of pumps with
7. Set the value with or
8. Mark Filling pressure with
9. Set the value with or
10. Mark Max. time with
11. Set the value with or
12. Mark Warning or Alarm + stop with
.
13. Mark Ramp time with
14. Set the value with or
15. Mark Activated, and press
Factory setting
The function is deactivated.
2. Pressure build-up phase
Time [sec]
Ramp time
or , and press
or , and press
.
, and save with .
or .
, and save with .
or .
, and save with .
or .
, and save with .
or , and press
or .
, and save with .
.
.
39