Product Guide

Product data
SQFlex
1
6
Overvoltage and undervoltage protection
Overvoltage and undervoltage may occur in case of
unstable power supply or a faulty installation.
The pump will be cut out if the voltage falls outside the
permissible voltage range. The motor is automatically
cut in when the voltage is again within the permissible
voltage range. Therefore no extra protection relay is
needed.
Note: The MSF 3 motor is protected against transients
from the power supply according to IEC 60664-1
"overvoltage category III" (4 kV). In areas with high
lightning intensity, external lightning protection is
recommended.
Overload protection
In case the upper load limit is exceeded, the motor will
automatically compensate for this by reducing the
speed. If the speed falls below 500 rpm, the motor will
be cut out automatically.
The motor will remain cut out for 10 seconds after
which period the pump will automatically attempt to
restart.
The overload protection prevents burnout of the motor.
Consequently, no extra motor protection is required.
Overtemperature protection
A permanent-magnet motor gives off very little heat to
its surroundings. In combination with an efficient
internal circulation system leading the heat away from
the rotor, stator and bearings, this fact ensures
optimum operating conditions for the motor.
As an extra protection, the electronic unit has a
built-in temperature sensor. When the temperature
rises above 185 °F (85°C), the motor is automatically
cut out. When the temperature has dropped to
165 °F (73 °C), the motor is automatically cut in again.
Maximum Power Point Tracking (MPPT)
The built-in electronic unit gives the SQFlex system a
number of advantages compared to conventional
products. One of these advantages is the built-in
microprocessor with MPPT (MPPT = Maximum Power
Point Tracking).
Thanks to the MPPT-function, the pump duty point is
continuously optimized according to the input power
available. MPPT is only available for pumps connected
to DC supply.
Wide voltage range
The wide voltage range enables the motor to operate
at any voltage from 30-300 VDC or 90-240 VAC. This
makes installation and sizing especially easy.
Built-in sand shield
The built-in sand shield prevents sand damage to the
pump and motor by slinging it out through the oval
slots located at the base of the pump end.
Reliability
The MSF 3 motor has been developed with a view to
high reliability achieved through the following features:
• carbon/ceramic bearings
• excellent starting capabilities
• various protection facilities.
Simple installation
The following features ensure simple installation of
the SQF pump:
• low weight ensuring user-friendly handling
• installation in 3", 4" or larger boreholes
• only an on/off switch is needed, which means that
no extra motor starter / starter box is necessary.
Note: Horizontal installation requires the water level
electrode to be placed above the pump to ensure the
dry-running protection.
Fig. 6 Installation of SQF pumps
Fig. 7 Horizontal installation
Ease of service
The modular pump and motor design facilitates
installation and service. The cable and the end cover
with socket are fitted to the pump with screws which
enable replacement.
TM02 2246 3901TM02 2435 3901
Allowed
Not allowed
12-24 in. (.3 to .6 m)