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

N L
Cs
1 2 3 4
1
Fig. 16 CSIR
N L
Cs
1 1 2 2 3 3 4 4
1
Fig. 17
CSCR

Connection of three-phase motors

Three-phase motors must be protected. See section
6.2.2 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.
6.6.4 Checking the direction of rotation
The pump must not be started until the suction
interconnector has been completely submerged in
the liquid.
When the pump has been connected to the power supply, check
the direction of rotation:
1. Start the pump and measure quantity of water and head.
2. Stop the pump and interchange two phases.
3. Start the pump and measure quantity of water and head.
4. Stop the pump.
5. Compare the two results. The connection giving the larger
quantity of water and the higher head is the correct one.
6.7 Connection of three-phase motors
Three-phase motors must be protected. See section
6.2.2 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.
Cr
6.7.1 Grundfos mMotors wound
The connection of Grundfos submersible
direct-on-line starting appears from the table below and fig. 18.
Mains
Grundfos 4" and 6" motors
PE PE (yellow and green)
L1
L2
L3
Check the direction of rotation as described in section
6.6.4 Checking the direction of
PE L1
PE U
M
3
Fig. 18 Grundfos motors - direct-on-line starting
for- direct-on-line starting
motors wound for
Cable/connection
U (brown)
V (black)
W (grey)
rotation.
L2 L3
V W
15