The SQFlex from Grundfos are submersible drilling pumps designed to pump
agua Water supply systems based on renewable energy.
 
Grundfos Pump Head Graph
 
Dry run protection
The SQF pump is protected against running dry to
to prevent damage to the pump. dry running
the protection is activated by a water level electrode placed
on the motor cable 0.3 - 0.6 m above the pump,
depending on the type of pump.
The water level electrode measures the contact
Resistance to sleeve the motor through the water. When
the water level falls below the water level electrode, the
the pump will be cut off. The pump will automatically connect
again 5 minutes after the water level is above the water
level electrode
Fig. 2 Vertical installation
Fig. 3 Horizontal installation
High efficiency
The MSF 3 motor is a permanent magnet motor
(PM motor) with higher efficiency within the
power range compared to a conventional asynchronous
engine.
In addition to this, the segmented motor stator
contributes considerably to high efficiency.
The MSF 3 engine is further characterized by
a high locked-rotor torque even with low power supply.
Overvoltage and undervoltage
protection
Overvoltages and undervoltages can occur in case of
unstable power supply or faulty installation.
The pump will shut off if the voltage drops outside of the
allowable voltage range. The motor is automatically
cut off when the voltage is back within the allowable
voltage range. Therefore, an additional protection relay is not needed.
necessary.
Note: The MSF 3 motor is protected against transients
of the power supply according to EN/IEC 61000-4-5
(6kV). In areas with high lightning intensity, external
Lightning protection is recommended.
overload protection
In case the upper load limit is exceeded, the motor
automatically compensate for this by reducing the
speed. If the speed drops below 500 min-1, the engine
be cut off automatically.
The engine will remain off for 10 seconds, after which
period, the pump will attempt to automatically restart.
Overload protection prevents the motor from burning out.










































 
Overtemperature protection
A permanent magnet motor emits very little heat to
its surroundings. In combination with an efficient
internal circulation system that directs heat away from
rotor, stator and bearings, this fact ensures
optimal engine operating conditions.
As additional protection, the electronic unit has a
temperature sensor. When the temperature rises above
+85 °C, the motor is automatically switched off. when the
temperature has dropped to +75 °C, the engine is
it cuts off automatically again.
maximum power point
(MPPT)
The built-in electronic unit gives the SQFlex system
a number of advantages compared to conventional
products. One of these advantages is the integrated function
microprocessor with MPPT (MPPT = Maximum Power
point tracking).
Thanks to the MPPT function, the duty point of the pump is
continuously optimized according to input power
available. MPPT is only available for connected pumps
to the DC supply.
wide voltage range
The wide voltage range allows the motor to run at
any voltage from 30-300 VDC or 90-240 VAC. East
makes installation and sizing especially easy.
reliability
The MSF 3 engine has been developed in order to
high reliability which is achieved through the following
features:
• carbon/ceramic bearings
• excellent starting capabilities
• various protection facilities.
Facility
The following features ensure easy installation of the
SQF pump:
• Low weight that guarantees easy handling.
• Installation in 3", 4" or larger wells.
• Only one on/off switch is needed, which means that
no additional motor starter/jump box is needed.
• SQF is available with cord and plug.
Note: Horizontal installation requires the water level
electrode to be placed min. 0.3 to 0.6 m above the
pump to ensure protection against running dry.










































 
 
 
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