Grundfos Control MPC Serie Manual De Instrucciones página 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 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. 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.