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3. Installation positions
3.1 Positional requirements
The pump is suitable for vertical as well as horizontal
installation, however, the pump shaft must never fall
below the horizontal plane, see fig. 3.
If the pump is to be installed horizontally, e.g. in a
tank, and there is a risk that the pump might be cov-
ered by mud, it must be installed in a flow sleeve.
Allowed
Fig. 3 Pump position
4. Electrical connection
4.1 General
The electrical connection should be carried out by an
authorized electrician in accordance with local regula-
tions.
Before starting work on the pump, make
sure that the electricity supply has been
switched off and that it cannot be acciden-
tally switched on.
The pump must be grounded.
The pump must be connected to an exter-
nal mains switch.
The supply voltage, rated maximum current and
power factor (PF) appear on the motor nameplate.
The required voltage for Grundfos submersible
MS 3/MSE 3 motors, measured at the motor termi-
nals, is –10%/+6% of the nominal voltage during con-
tinuous operation (including variation in the supply
voltage and losses in cables).
If the pump is connected to an installation where a
Ground Fault circuit breaker (GFI) is used as additional
protection, this circuit breaker must trip out when
ground fault currents with DC content (pulsating DC)
occur.
Note: The pump must never be connected to a capaci-
tor or to another type of control box than CU 300 or
CU 301.
Note: The pump must never be connected to an exter-
nal frequency converter.
6
Not allowed
Supply voltage:
1 x 90-120 V or 1 x 200-240 V –10%/+6%, 50/60 Hz.
The current consumption can only be measured accu-
rately by means of a true RMS instrument. If other in-
struments are used, the value measured will differ
from the actual value.
The SQE pumps can be connected to a CU 300 or
CU 301 control box.
4.2 Motor protection
The motor has built-in automatic thermal overload
protection and requires no additional motor protec-
tion.
4.3 Connection of motor
The motor can be connected directly to the main cir-
cuit breaker.
Start/stop of the pump will typically be done via a
pressure switch, see fig. 4.
Note: The pressure switch must be rated for the maxi-
mum amps of the specific pump.
Reduced risk of electric shock during opera-
tion of this pump requires the provision of
acceptable grounding. If the means of con-
nection to the supply connected box is
other than grounded metal conduit, ground
the pump back to the service by connecting
a copper conductor, at least the size of the
circuit supplying the pump.
Single-phase 2-wire wiring diagram
for Grundfos motors
Pressure
switch
Pump and motor
Fig. 4 Wiring diagram
Note: The pump must never be connected to a capaci-
tor or to another type of control box than CU 300 or
CU 301.
Quick disconnection
Black
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