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Check the direction of rotation as described in section
4.5.1 Checking of direction of rotation .
Fig. 9
L1
W2 U2 V2
U1
V1
If star-delta starting is not required, but direct-on-line starting is,
the submersible motors should be connected as shown in fig. 10.
Fig. 10
L1
W2 U2 V2
U1
V1
3
4.5.4 Connection in the case of unidentified cable marking/
connection
If it is unknown where the individual leads are to be connected to
the mains in order to ensure the correct direction of rotation, pro-
ceed as follows:
Motors wound for direct-on-line starting:
Connect the pump to the mains as is expected to be right.
Then check the direction of rotation as described in section
4.5.1 Checking of direction of rotation .
Motors wound for star-delta starting:
The windings of the motor are determined by means of an ohm-
meter, and the lead sets for the individual windings are named
accordingly: U1-U2, V1-V2 and W1-W2, see fig. 11.
Fig. 11
U1
U2
If star-delta starting is required, the leads should be connected as
shown in fig. 9.
If direct-on-line starting is required, the leads should be con-
nected as shown in fig. 10.
Then check the direction of rotation as described in section
4.5.1 Checking of direction of rotation .
L2 L3
PE
W1
PE
M
3
L2 L3
PE
W1
PE
M
V1
V2
W1W2
5. Pump installation
Before starting any work on the pump/motor, make
sure that the electricity supply has been switched off
and that it cannot be accidentally switched on.
5.1 Assembly of motor and pump
The bolts and nuts securing the straps to the pump must be tight-
ened diagonally to the torques stated in the following table:
Number of
Pump type
impellers
SP 55 / SP 90
10 to 17
The bolts holding the chambers together on pumps types SP 270,
SP 300 and SP 360 must be tightened to 60 Nm.
Make sure that the coupling between the pump and motor en-
gages properly.
When assembling the motor and the pump, the nuts must be
tightened diagonally to the torques stated in the following table:
Pump/motor
Staybolt diameter
M8
M10
M12
M14
M16
M18
Note: Make sure that the pump chambers are aligned when as-
sembly has been completed.
5.2 Fitting of submersible drop cable
Before fitting the submersible drop cable to the motor, make sure
that the cable socket is clean and dry.
To facilitate the fitting of the cable, lubricate the rubber parts of
the cable plug with non-conducting silicone paste.
Tighten the screws holding the cable to the torques stated:
MS 6000:
4.0 Nm.
MMS 6000:
10 Nm.
MMS 12000: 15 Nm.
5.3 Riser pipe
If a tool, e.g. a chain pipe wrench, is used when the riser pipe is
fitted to the pump, the pump must only be gripped by the pump
discharge chamber.
The threaded joints on the riser pipe must all be well cut and fit
together to ensure that they do not work loose when subjected to
torque reaction caused by the starting and stopping of the pump.
The thread on the first section of the riser pipe which is to be
screwed into the pump should not be longer than the threads in
the pump.
Where flanged pipes are used, the flanges should be slotted to
take the submersible drop cable and a water indicator hose, if fit-
ted.
5.4 Maximum installation depth below water level
Grundfos MS 6000:
600 m.
Grundfos MMS 6000:
200 m.
Grundfos MMS 8000:
200 m.
Grundfos MMS 10000: 200 m.
Grundfos MMS 12000: 200 m.
Straps
Torque
Bolt/nut
[Nm]
M20
180
Torque
[Nm]
18
35
60
95
145
200
83
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