Electrical Connection; Cable Entry/Screwed Connection; Three-Phase Connection - Grundfos CR Serie Instrucciones De Instalación Y Funcionamiento

7. Electrical connection

The electrical connection must be carried out by an authorised
electrician in accordance with local regulations.
Warning
Connect the CR pump to an external mains switch
placed close to the pump and to a motor-protective
circuit breaker or a CUE frequency converter. Make
sure you can lock the mains switch in OFF position
(isolated). Type and requirements as specified in EN
60204-1, 5.3.2.
Warning
Before removing the terminal box cover and before
removing or dismantling the pump, make sure that
the power supply has been switched off and that it
cannot be accidentally switched on.
Consider whether it is necessary to install an
Caution
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 will be used and the motor terminal connection
is correct. You will find a wiring diagram in the terminal box.

7.1 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 (standard EN 50262).
Motor Number and size
[kW] of cable entries
0.25 - 0.55 2 x M20 x 1.5
0.75 - 3.0 2 x M20
4.0 - 7.5 4 x M25
2 x M20
11-22
4 x M40
30-45 2 x M50 x 1.5
55-75 2 x M63 x 1.5
12
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

7.2 Three-phase connection

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. 15 Delta connection
U1
U2
W2
V2
W1
V1
Fig. 16 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.
Mains supply [V]
Star connection
/ 380-415
/ 660-690
1)
/ 380-480
/ 660-690
W2 U2 V2
U1 V1 W1
L
L L
1 2 3
W2 U2 V2
V1
U1 W1
L
L L
1 2 3