Grundfos CRE Montage- Und Betriebsanleitung Seite 7

5.1.1 Preparation
Before connecting the E-pump to the mains, take the issues
illustrated in the figure below into consideration.
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ELCB
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PE
Fig. 2 Mains-connected pump with mains switch, backup
fuses, additional protection and protective earthing
5.1.2 Protection against electric shock - indirect contact
Warning
The pump must be earthed in accordance with
national regulations.
As the leakage current of 4 - 7.5 kW motors is > 3.5
mA, take extra precautions when earthing these
motors.
EN 50178 and BS 7671 specify the following precautions when
leakage current > 3.5 mA:
• The pump must be stationary and installed permanently.
• The pump must be permanently connected to the power
supply.
• The earth connection must be carried out as duplicate
conductors.
Protective earth conductors must always have a yellow/green (PE)
or yellow/green/blue (PEN) colour marking.
5.1.3 Backup fuses
For recommended fuse sizes, see section
5.1.4 Additional protection
If the pump is connected to an electric installation where an earth
leakage circuit breaker (ELCB) is used as additional protection,
the circuit breaker must be of a type marked with the following
symbols:
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 20.3 Leakage current.
During start and at asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.
5.1.5 Motor protection
The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).
5.1.6 Protection against mains voltage transients
The pump is protected against voltage transients by built-in
varistors between the phases and between phases and earth.
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20.1 Supply voltage.
ELCB
5.1.7 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 pump 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.
Fig. 3 Mains connection
Cable glands
Cable glands comply with EN 50626.
2 x M16 cable gland, cable diameter ∅4-∅10
•
1 x M20 cable gland, cable diameter ∅9-∅17
•
• 2 x M16 knock-out cable entries.
Warning
If the supply cable is damaged, it must be replaced
by qualified personnel.
Grid types
Three-phase E-pumps can be connected to all grid types.
Warning
Do not connect three-phase E-pumps to a mains
supply with a voltage between phase and earth of
more than 440 V.
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