Positional Requirements; Liquid Temperatures/Cooling; Electrical Connection - Grundfos MS Instructions Manual

Grundfos MMS6, MMS8000, MMS10000 and
MMS12000 submersible motors
Do not use motor liquid that contains oil.
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.

Positional requirements

CAUTION
Hot surface
Minor or moderate personal injury
- If the pump is used for pumping hot
liquids (40 to 60 °C), make sure that
people cannot come into contact with
the pump and the installation, e.g. by
installing 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 cannot
be accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- The pump must be earthed.
- The pump must be connected to an
external main switch and must be
provided with means to locking it in the
OFF (isolated) position. Type and
requirements 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
transmitter is connected to a frequency
converter, he fuse melts and the
transmitter becomes inactive. The
transmitter can no longer be reactivated,
consequently, the motor thereafter
operates like one without a temperature
transmitter.
To enable monitoring of the motor
temperature 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
frequency higher than the rated frequency
(50 or 60 Hz). In connection with pump
operation, 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.
Motor protection
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 cannot
be accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- The pump must be connected to
protective earth.
- Switch off the power supply before
starting any work on the product.
- Make sure that the power supply cannot
be accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- When the motor has been thermally
switched off, the motor terminals are
still live. When the motor has cooled
sufficiently, it will restart automatically.
Required settings of the motor-protective circuit
breaker
If this requirement is not met, the motor
warranty will be invalidated.
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