20
9.4 Hydro-Unit MCF
ATTENTION
See factory settings 3-2-2-1
The Hydro-Unit MCF is equipped with one variable
frequency drive. If the Hydro-Unit is rotation-
controlled, the required system pressure is sensed by
a pressure sensor on the outlet side of the
installation. An integrated adjustable PID-controller in
the software of the Megacontrol ensures that the
system pressure remains constant by successively
switching on or off one or more (whether or not)
rotation-controlled pumps with delay. A pump is only
switched on when 100% or respectively 0% of the
speed has been reached.
Table 19: Specific parameter settings MCF
Figure 12: 1 pump operation, 1 pump variable
Figure 13: 2 pump operation, 1 pump variable
Figure 14: 3 pump operation, 1 pump variable
Parameter Value
3-3-1 Number of pumps 1
2
3
4
5
6
3-3-2 Inlet Switch
Pressure
Level / valve ON-OFF
Level / valve prop.
3-3-3 Discharge VFD change-over
3-4-3-1 Communication Analog 0-20 mA /
4-20 mA
3-4-3-2 Proportional const. 3
3-4-3-3 Integral const. 0.9
3-5-1 Set point .... kPa
3-5-3 Bandwidth 10
3-5-4 Accumulation press. 30 kPa
3-5-13 Low pressure alarm 100 kPa
3-6-1 Opt. pump starts/h 30
3-6-2 Min. run time 1 s
3-6-3 Min. run time corr. 0 s
3-6-8 Run-dry delay Default 30 s
Float/level control 1 s
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