English (GB)
13
5.5.4 Checking the direction of rotation of the
motor
Once the motor is connected to the power supply,
determine the correct direction of rotation as follows:
1. Add a few drops of water to the shaft seal before
starting.
2. Start the motor and check the direction of rotation
by watching the motor shaft. For Grundfos SP
pumps, the direction of rotation must be counter-
clockwise.
3. Interchange two of the phase connections if the
direction of rotation is wrong. In case of motors
wound for star-delta starting, exchange U1 by V1
and U2 by V2.
5.5.5 Checking the direction of rotation of the
pump set
Once the pump is 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.
5.6 Connection of three-phase motors
5.6.1 Motors wound for direct-on-line starting
The connection of Grundfos submersible motors
wound for direct-on-line starting is displayed in the
table below and fig. 12.
Check the direction of rotation as described in
section 5.5.4 Checking the direction of rotation of the
motor.
Fig. 12 Motors wound for direct-on-line starting
The pump must not be started until the
suction interconnector has been
completely submerged in the liquid.
Mains
Cable/connection
Grundfos 4" and 6" motors
PE PE (yellow and green)
L1 U (brown)
L2 V (black)
L3 W (grey)
TM03 2099 3705
L1
PE WVU
PE
M
L3L2
3
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