Connection Of Three-Phase Motors - Grundfos SP Series Installation And Operating Instructions Manual

6.6 Connection of three-phase motors

Three-phase motors must be protected. See section
6.1.2 Three-phase motors.
For electrical connection via the MP 204, see the separate
installation and operating instructions for this unit.
When a conventional motor-protective circuit breaker is being
used, the electrical connection must be carried out as described
below.
6.6.1 Motors wound for direct-on-line starting
The connection of Grundfos submersible motors wound for
direct-on-line starting appears from the table below and fig. 14.
Mains
Grundfos 4" and 6" motors
PE PE (yellow and green)
L1
L2
L3
Check the direction of rotation as described in section
6.6 Connection of three-phase
PE L1
PE U
Fig. 14 Grundfos motors - direct-on-line starting
6.6.2 Motors wound for star-delta starting
The connection of Grundfos submersible motors wound for
star-delta starting appears from the table below and fig. 15.
Connection
PE
U1
V1
W1
W2
U2
V2
Cable/connection
U (brown)
V (black)
W (grey)
motors.
L2 L3
V W
M
3
Grundfos 6" motors
Yellow and green
Brown
Black
Grey
Brown
Black
Grey
Check the direction of rotation as described in section
6.6 Connection of three-phase
PE L1
W2 U2
PE U1
Fig. 15 Grundfos motors wound for star-delta starting
If direct-on-line starting is required, the motors must be
connected as shown in fig. 16.
PE L1
W2 U2
PE U1
Fig. 16 Grundfos motors wound for star-delta starting -
direct-on-line starting
6.6.3 MS6000P Synchronous motors requiring double
cabling
PE L1
U2
PE U1 V1
Fig. 17 Grundfos MS6000P 37 kW and 45 kW
motors.
L2 L3
V2
V1 W1
M
3
L2 L3
V2
V1 W1
M
3
L2 L3
V2 W2
W1
M
11