Grundfos CRE Montage- Und Betriebsanleitung Seite 10

• 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. 8 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.
5.2.3 Backup fuses
For recommended fuse sizes, see section
5.2.4 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 21.3 Leakage current.
During start and at asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.
5.2.5 Motor protection
The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).
5.2.6 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
19. Maintenance and service.
10
21.1 Supply voltage.
ELCB
5.2.7 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.
Torques, terminals L1-L3:
Min. torque: 2.2 Nm
Max. torque: 2.8 Nm
Fig. 9 Mains connection
Cable glands
Cable glands comply with EN 50626.
1 x M40 cable gland, cable diameter ∅16-∅28
•
1 x M20 cable gland, cable diameter ∅9-∅17
•
2 x M16 cable gland, cable diameter ∅4-∅10
•
• 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.
5.2.8 Start/stop of pump
The number of starts and stops via the mains voltage
Caution
must not exceed 4 times per hour.
When the pump is switched on via the mains, it will start after
approximately 5 seconds.
If a higher number of starts and stops is desired, use the input for
external start/stop when starting/stopping the pump.
When the pump is switched on via an external on/off switch, it will
start immediately.