Grundfos MMS6, MMS8000, MMS10000 and
MMS12000 submersible motors
Before fitting the motor to a pump after a
long period of storage, lubricate the shaft
seal by adding a few drops of water and
turning the shaft.
Motors suitable for horizontal installation
CAUTION
Hot surface
Minor or moderate personal injury
‐ If the pump is used for pumping hot liq-
uids (40 to 60 °C), make sure that peo-
ple cannot come into contact with the
pump and the installation, e.g. by in-
stalling a guard.
During operation, the motor must always
be completely submerged in the liquid.
Make sure that the NPSH values of the
mounted pump are fulfilled.
Liquid temperatures/cooling
In case the stated flow velocity cannot be achieved, a flow sleeve must be installed
For 37 kW MMS6 (only PVC windings), 110 kW MMS8000 and 170 kW MMS10000, the maximum
liquid temperature is 5 °C lower than stated in the table above. For 190 kW MMS10000, 220-250 kW
MMS12000/50 Hz and MMS12000/60 Hz, the temperature is 10 °C lower than stated.
Electrical connection
DANGER
Electric shock
Death or serious personal injury
‐ Switch off the power supply before
starting any work on the product.
‐ Make sure that the power supply can-
not be accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
‐ The pump must be earthed.
‐ The pump must be connected to an ex-
ternal main switch and must be provi-
ded with means to locking it in the OFF
(isolated) position. Type and require-
ments are specified in EN 60204-1,
5.3.2
The electrical connection must be carried
out by an authorised person in accordance
with local regulations.
General
If an MS motor with temperature transmit-
ter is connected to a frequency converter,
he fuse melts and the transmitter becomes
inactive. The transmitter can no longer be
reactivated, consequently, the motor there-
after operates like one without a tempera-
ture transmitter.
To enable monitoring of the motor temper-
ature when running at frequency converter
operation, Grundfos recommends that a
Pt100 or a Pt1000 sensor be installed.
During frequency converter operation, it is
not advisable to run the motor at a fre-
quency higher than the rated frequency
(50 or 60 Hz). In connection with pump op-
eration, it is important never to reduce the
frequency (and consequently the speed) to
such a level that the necessary flow of
cooling liquid past the motor is no longer
ensured.
6
English (GB)
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