Grundfos E Serie Instrucciones De Instalación Y Funcionamiento página 11

5.4.1 Preparation
Before connecting the E-pump to the mains, take the issues
illustrated in the figure below into consideration.
L1
ELCB
L2
L3
PE
Fig. 10 Mains-connected pump with mains switch, backup
fuses, additional protection and protective earthing
5.4.2 Protection against electric shock - indirect contact
Warning
The pump must be earthed in accordance with local
regulations.
As the leakage current of 11-22 kW motors is greater
than 10 mA, take extra precautions when earthing
these motors.
EN 61800-5-1 specifies that the pump must be stationary and
installed permanently when the leakage current is greater than 10
mA.
One of the following requirements must be fulfilled:
• A single protective earth conductor having a cross-sectional
2
area of min. 10 mm copper.
Fig. 11 Connection of a single protective earth conductor
using one of the conductors of a 4-core mains cable
(with cross-sectional area of min. 10 mm
• Two protective earth conductors of the same cross-sectional
area as the mains conductors, with one conductor connected
to an additional earth terminal in the terminal box.
Fig. 12 Connection of two protective earth conductors using
two of the conductors of a 5-core mains cable
Protective earth conductors must always have a yellow/green
(PE) or yellow/green/blue (PEN) colour marking.
5.4.3 Backup fuses
For recommended fuse sizes, see section
5.4.4 Additional protection
If the pump is connected to an electric installation where an earth
leakage circuit breaker (ELCB) is used as additional protection,
L1
the circuit breaker must be of a type marked with the following
L2
symbols:
L3
This circuit breaker is type B.
The total leakage current of all the electrical equipment in the
installation must be taken into account.
The leakage current of the motor in normal operation can be seen
in section 21.3 Leakage
During start and at asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.
5.4.5 Motor protection
The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).
5.4.6 Protection against mains voltage transients
The pump is protected against mains voltage transients in
accordance with EN 61800-3 and is capable of withstanding a
VDE 0160 pulse.
The pump has a replaceable varistor which is part of the transient
protection.
Over time this varistor will be worn and need to be replaced.
When the time for replacement has come, R100 and PC Tool E-
products will indicate this as a warning. See section
18. Maintenance and
5.4.7 Supply voltage and mains
3 x 380-480 V - 10 %/+ 10 %, 50/60 Hz, PE.
The supply voltage and frequency are marked on the pump
nameplate. Make sure that the motor is suitable for the power
supply of the installation site.
The wires in the terminal box 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.
2
)
Fig. 13 Mains connection
21.1 Supply
ELCB
current.
service.
Torques, terminals L1-L3:
Min. torque: 2.2 Nm
Max. torque: 2.8 Nm
voltage.
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