Grundfos MS Instructions

English (GB)
4
Cable sizing
Control of single-phase MS402
Checking the direction of rotation of the pump
set
Frequency converter
Motor installation
In case of unintended flow of water through a non-
energized pump, there is a risk that the moving parts
of the pump and the motor will start rotating, thereby
generating voltage over the terminals. The size of
the voltage depends on the speed of rotation.
Consequently, the motor terminals must be
considered as live until proven otherwise.
Removing and fitting the cable guard
Assembly of pump set on site
Fitting the pump to the motor
Submersible motor cables are
dimensioned for submersion in the liquid,
and will not necessarily have sufficient
cross-section to be in air.
Single-phase MS402 submersible motors
below 1.1 kW incorporate motor protection
that cuts out the motor in case of
excessive winding temperatures while the
motor is still supplied with voltage. Allow
for this when the motor forms part of a
control system.
The pump must not be started until the
suction interconnector has been
completely submerged in the liquid.
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.
To enable monitoring of the motor
temperature, Grundfos recommends that a
Pt100 or a Pt1000 be installed.
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
- Make sure that motor cable ends are
not live before starting any work on the
product.
- Make sure that the power supply cannot
be accidentally switched on.
Once the cable guard is fitted, make sure
that the pump chambers are aligned.
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.
- Do not lower or lift the product by
means of the motor cable.
WARNING
Crushing of hands
Death or serious personal injury
- When the motor is to be assembled with
the pump at the borehole, make sure to
use suitable pipe clamps.
- Stay clear of the wire and cable while
placing the motor in the borehole.
WARNING
Crushing of feet
Death or serious personal injury
- When the motor is to be assembled with
the pump at the borehole, make sure to
use suitable pipe clamps.
- Stay clear of the wire and cable while
placing the motor in the borehole.
WARNING
Sharp element
Death or serious personal injury
- When mounting the facilitating pipe,
wear personal protective equipment to
avoid cutting on sharp edges.
WARNING
Crushing of hands
Death or serious personal injury
- Make sure to use suitable pipe clamps.
- Stay clear of the wire and cable while
placing the motor in the borehole.
WARNING
Crushing of feet
Death or serious personal injury
- Make sure to use suitable pipe clamps.
- Stay clear of the wire and cable while
placing the motor in the borehole.
Be careful not to bend or damage long
pump sets when moving them from
horizontal to vertical positions.

Grundfos MS Specifications

General

Degree of protection	IP68
Insulation class	F
Max Liquid Temperature	40 °C
Rated power - P2	0.37 kW to 2.2 kW
Power frequency	50 Hz or 60 Hz
Power	0.37 kW to 2.2 kW
Housing Material	Stainless steel
Impeller Material	Stainless steel
Weight	Varies by model