Grundfos Control MPC-Serie Installationsanleitung Seite 46

Setting via the operating panel
• Settings > Secondary functions > Pilot pump.
1. Enable pilot pump
– Set: Changeover to pilot pump
– Set: Time hysteresis
– Set: Changeover to main pump
– Set: Time hysteresis.
2. Set: Pressure band cut-in.
Factory setting
The function is disabled.
8.7.26 Soft pressure build-up (4.3.3)
Fig. 73 Soft pressure build-up
Description
The function is typically used in pressure-boosting applications
and ensures a smooth startup of systems with for instance empty
pipes.
The soft pressure build-up program will be disabled if
the multisensor function is activated.
Startup takes place in two phases. See fig. 74.
1. Filling phaseThe 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 phaseThe 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. 74 Filling and pressure buildup phases
46
2. Pressure build-up phase
Time [s]
Ramp time
Setting range
• Pump speed
• Number of pumps
• Filling pressure
• Maximum filling time
• Warning or Alarm + stop
• "Ramp time" for "Pressure build-up phase".
Setting via the operating panel
• Settings > Secondary functions > Soft pressure build-up.
1. Select and set:
• Speed
• Number of pumps
• Filling pressure
• Max. time.
2. Select: Warning or Alarm + stop.
3. Set: Ramp time.
4. Select: Enabled.
Factory setting
The function is disabled.