Grundfos Hydro Multi-E Montage- Und Betriebsanleitung Seite 9

6.4.5 Supply voltage
3 × 380-480 V - 10 %/+ 10 %, 50/60 Hz, PE.
The supply voltage and frequency are marked on the pump
nameplate. Make sure that the pump is suitable for the power
supply of the installation site.
The wires in the Hydro Multi-E breaker cabinet must be as short
as possible. Excepted from this is the protective earth conductor
which must be so long that it is the last one to be disconnected in
case the cable is inadvertently pulled out of the cable entry.
For maximum backup fuse, see section
ELCB
Installation in building
Fig. 10 Example of a mains-connected Hydro Multi-E with
backup fuses and additional protection
Pressure switch setting
H
Setpoint
Cut-in pressure
Pressure switch 1
Pressure switch 2
Pressure switch 3
One pump in max.
operation
Fig. 12 Functional diagram
19.1 Supply voltage.
Breaker cabinet
Two pumps in
max. operation
6.5 Emergency operation (optional)
The emergency operation feature ensures the supply of water
even if the sensor or control unit fails.
In this situation, all pumps will operate at maximum performance.
6.5.1 Connection of pressure switches
The pressure switches for emergency operation must be
connected to terminals 4, 5 and 6 of each Hydro Multi-E pump.
Stop Max.
Fig. 11 Connection of pressure switches
6.5.2 Setting of pressure switches
Figure 12 shows the following:
• relationship between cut-out, differential and cut-in pressures
• pressure switch settings
• number of pumps in emergency operation.
Three pumps in
max. operation
6 5 4 3 2
6: GND
5: +10 V
4: Setpoint input
Cut-out pressure
Differential pressure
Cut-in pressure
Q
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