21
9.5 Hydro-Unit MCMF
ATTENTION
See factory settings 3-2-2-1
The Hydro-Unit MCMF 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 20: Specific parameter settings MCMF
9.6 Hydro-Unit PumpDrive 2 Eco
ATTENTION
See factory settings 3-2-2-1
Figure 15: 1 pump operation, 1 pump variable
Figure 16: 2 pump operation, 2 pump variable
Figure 17: 3 pump operation, 3 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 fixed all
3-4-3-1 Communication Danfoss VLT 2800
Danfoss MicroDrive
Danfoss AquaDrive
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
3-4-3-5-3 No flow step 1
3-4-3-9 VFD Ramp-Up 3
3-4-3-10 VFD Ramp-Down 3
3-4-3-11 VFD min. frequency 30
3-4-3-12 VFD max. frequency 160
3-4-3-13 P nominal of VFD 1500 See VFD
3-4-3-14 U nominal of VFD 400 See VFD
3-4-3-15 F nominal of VFD 50/60
3-4-3-16 I nominal of VFD 4 See VFD
3-4-3-17 RPM nominal of VFD 2880 See motor name
plate
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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