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3.2 Electrical connection
Carry out the electrical connection according to local
regulations.
The pump incorporates a motor-protective circuit
breaker and all control logic.
The supply voltage and frequency are marked on the
pump nameplate. For voltage tolerance, see section
. Make sure that the motor is
suitable for the power supply available at the
installation site.
All pumps are supplied with 10 m cable and a free
cable end.
3.2.1 Wiring diagrams
Single-phase pumps
The pump has a patented start function which
eliminates the need of a starting capacitor. The run
capacitor is incorporated in the pump.
Fig. 2
Wiring diagram for single-phase pumps
Do not run the pump via a frequency
converter.
DANGER
Electric shock
Death or serious personal injury
- Connect the pump to an external main
switch which ensures all-pole
disconnection with a contact separation
according to EN 60204-1, 5.3.2.
- It must be possible to lock the main
switch in position 0. Type and
requirements as specified in EN 60204-
1, 5.3.2.
Make sure there are at least 3 m free cable
above the maximum liquid level.
The classification of the installation site
must be approved according to local rules
in each individual case.
The CIU unit, if used, must not be installed
in potentially explosive environments.
On explosion-proof pumps, make sure that
an external earth conductor is connected
to the external earth terminal of the pump
using a conductor with a secure cable
clamp. Clean the surface for external earth
connection, and fit the cable clamp.
The cross section of the earth conductor
must be at least 4 mm
2
, e.g. type H07 V2-
K (PVT 90 °) yellow and green.
Make sure that the earth connection is
protected from corrosion.
DANGER
Electric shock
Death or serious personal injury
- If the power cable is damaged, it must
be replaced by the manufacturer, his
service agent or a similarly qualified
person.
Set the motor-protective circuit breaker to
the maximum current of the pump. The
maximum current is stated on the pump
nameplate.
Make sure that the pump is connected in
accordance with the instructions given in
this booklet.
DANGER
Electric shock
Death or serious personal injury
- Before installing the pump and starting it
up for the first time, check the power
cable for visible defects to avoid short
circuits.
A possible replacement of the power cable
must be carried out by Grundfos or a
service workshop authorised by Grundfos.
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