Grundfos Hydro Multi-E Montage- Und Betriebsanleitung Seite 8

6.3.3 Motor protection
The Hydro Multi-E requires no external motor protection.
The motors incorporate thermal protection against steady
overload and stalled condition.
6.3.4 Protection against mains voltage transients
The Hydro Multi-E is protected against mains voltage transients
in accordance with EN 61800-3.
6.3.5 Supply voltage
3 × 400/230 V - 10 %/+ 10 %, 50/60 Hz, N, 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. 7 Example of a mains-connected Hydro Multi-E with
backup fuses and additional protection
6.4 Electrical installation, Hydro Multi-E with
three-phase pumps
Fig. 8 Hydro Multi-E with three-phase pumps
Fig. 9 Hydro Multi-E with single-phase CME pumps
The user or the installer is responsible for the
installation of correct earthing and protection
Note
according to local regulations. All work must be
carried out by trained personnel.
Warning
Never make any connections in the Hydro Multi-E
breaker cabinet or in the terminal box of each
individual pump unless the power supply has
been switched off for at least 5 minutes.
8
18.1 Supply voltage.
Breaker cabinet
6.4.1 Protection against electric shock - indirect contact
Warning
The Hydro Multi-E must be earthed and protected
against indirect contact in accordance with local
regulations.
Protective earth conductors must always have a yellow/green
(PE) colour marking.
As the leakage current of 4 to 5.5 kW motors is
> 3.5 mA, these motors must be connected to
Note
especially reliable/sturdy earth connections.
The leakage current of the Hydro Multi-E can be found in section
19.2 Leakage current.
EN 50178 and BS 7671 specify the following:
Leakage current > 3.5 mA
The Hydro Multi-E must be stationary and installed permanently.
Furthermore, it must be connected permanently to the power
supply.
The earth connection must be carried out as duplicate
conductors.
6.4.2 Additional protection
If the Hydro Multi-E is connected to an electric installation where
an earth leakage circuit breaker (ELCB) is used as additional
protection, this circuit breaker must be of the following type:
• It is suitable for handling leakage currents and cutting-in with
short pulse-shaped leakage.
• It trips out when alternating fault currents and fault currents
with DC content, i.e. pulsating DC and smooth DC fault
currents occur.
For these booster systems an earth leakage circuit breaker type
B must be used.
This circuit breaker must be marked with the following symbols:
When an earth leakage circuit breaker is
selected, the total leakage current of all the
Note
electrical equipment in the installation must be
taken into account.
The leakage current of the Hydro Multi-E can be found in section
19.2 Leakage current.
6.4.3 Motor protection
The Hydro Multi-E requires no external motor protection.
The motors incorporate thermal protection against steady
overload and stalled condition.
6.4.4 Protection against mains voltage transients
The Hydro Multi-E is protected against mains voltage transients
in accordance with EN 61800-3.
ELCB