Electrical Connection - Grundfos CR Instructions D'installation Et D'utilisation

3.2 Electrical connection

Follow the instructions for the motor when
carrying out the electrical connections.
The electrical connection must be carried out by an
authorised electrician in accordance with local
regulations.
WARNING
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
- Connect the pump to an external main
switch close to the pump and to a
motor-protective circuit breaker or a
CUE frequency converter. Make sure
you can lock the main switch in OFF
position (isolated). Type and
requirements as specified in EN 60204-
1, 5.3.2.
Consider whether it is necessary to install
an emergency stop switch.
The operating voltage and frequency are marked on
the motor nameplate. Make sure that the motor is
suitable for the power supply on which it is used and
that the motor terminal connection is correct. You will
find a wiring diagram in the terminal box.
3.2.1 Cable entry/screwed connection
All motors are supplied without screwed cable
entries. The table below shows the numbers and
sizes of cable entry holes of the terminal box
according to the standard EN 50262.
Number and
Motor
size of cable
[kW]
entries
0.25-
2 x M20 x 1.5
0.55
0.75-
2 x M20
3.0
4.0-
4 x M25
7.5
2 x M20
11-22
4 x M40
30-45 2 x M50 x 1.5
55-75 2 x M63 x 1.5
10
Description
The holes have precast
threads and are closed
with knock-out cable
entries.
The holes are closed
with knock-out cable
entries.
The holes are closed
with knock-out cable
entries.
The holes are closed
with knock-out cable
entries.
Blanking plug.
Blanking plug.
3.2.2 Three-phase connection
Mains supply [V]
Delta
connection
220-240
50 Hz
380-415
220-277
60 Hz
380-480
1)
60 Hz motors, 0.37 - 1.1 kW: 220-277/380-440 V.
W2 U1
W1
U2
V2
V1
Fig. 10 Delta connection
U1
U2
W2
V2
W1
V1
Fig. 11 Star connection
If the motor is provided with PTC sensors or PTO
contacts, the connection must be in accordance with
the wiring diagram in the terminal box.
Connect three-phase motors to a motor-protective
circuit breaker.
Star
connection
/ 380-415
/ 660-690
1)
/ 380-480
/ 660-690
W2 U2 V2
U1 V1 W1
L L L
1
2 3
U2
W2 V2
U1 V1 W1
L L L
1
2 3