22
The Hydro-Unit Megacontrol is equipped with multiple
variable frequency drives. 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 21: Specific parameter settings Megacontrol
Figure 18: 1 pump operation, 1 pump variable
Figure 19: 2 pump operation, 2 pump variable
Figure 20: 3 pump operation, 3 pump variable
Parameter Value
3-1-1-3-1 Pressure kPa
3-3-1 Number of pumps 1
2
3-3-2 Inlet Switch
3-3-3 Discharge VFD fixed all
3-4-2-1 Sensor press. 4 mA See pressure trans-
mitter
3-4-2-2 Sensor press. 20 mA See pressure trans-
mitter
3-4-2-3 Pumps ON sensor fail 1
3-4-2-4 Max power Limitation of the maxi-
mum power / maxi-
mum system load (1
pump is 100%)
3-4-3-1 Communication PumpDrive 2
3-4-3-2 Proportional const. 3
3-4-3-3 Integral time. 0.9
3-4-3-4 Differential time. 0
3-4-3-5-1 No flow bandwidth
0-1000 kPa
6
0-2500 kPa 16
3-4-3-5-2 No flow time 16
3-4-3-5-3 No flow step 3
3-4-3-5-4 No flow max. power 100
3-4-3-9 VFD Ramp-Up Depends on motor
size
3-4-3-10 VFD Ramp-Down Depends on motor
size
3-4-3-11 VFD min. frequency 30 Hz
3-4-3-12 VFD max. frequency 50/60 Hz
3-4-3-13 P nominal of VFD Motorpower W
3-4-3-14 U nominal of VFD 400 V
3-4-3-15 F nominal of VFD 50/60 Hz
3-4-3-16 I nominal of VFD Imax motor (by correct
Fand U) / Imax VFD
3-4-3-17 RPM nominal of VFD RPM at the correct F
3-5-1 Set point 400
3-5-3 Bandwidth With pressure vessel
10 kPa / Without pres-
sure vessel 20 kPa
3-5-4 Accumulation press. 30 kPa
3-5-5 Max.set point See pressure class
3-5-11 High pressure alarm See pressure class
3-5-13 Low pressure alarm 100 kPa
3-6-1 Opt. pump starts/h 30
3-6-2 Min. run time 10
3-6-3 Min. run time corr. 0
3-6-8 RDP delay Default 30 s
Float-level control 1 s
Parameter Value
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