Electrical Connection; Startup And Operation - BEDU POMPEN SD Serie Instructions Pour L'utilisation

• install a supplementary check valve, as the
pump valve does not ensure a perfect seal in the
horizontal position;
• the plant must allow for easy evacuation of the air
when starting.
6.4.4. Motor cooling
If the well (or tank) has a diameter which is
considerably greater than the pump width, it is
necessary to install a cooling flow shroud (a flow
inducer sleeve), that is an external jacket to ensure
a sufficient flow and water velocity to cool the motor
(see instruction motor).
6.4.5. Assembly of the pumps
The pumps are normally supplied with motor and pump
disconnected (except 4SD(F)(P) already assembled).
Connect the coupling and pump-motor
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suction lantern. Clean the surface to be
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coupled. Put the suction lantern of the
pump in correspondance of the motor
studs. Couple the grooved joint of the
pump to the motor shaft.
Screw in the nuts to the suction lantern, then fix
them crosswise starting from the one opposed to
the cable as shown in the figure below. The torque
recommended is 10Nm (for 4" motors).
Attach the cable to the pump with the cable guard
and place the filter on the suction lantern.
Follow separate operating instructions (if available)
of the motor.

6.5. Electrical connection

OFF
Electrical connection must be carried out only
by a qualified electrician in accordance with
local regulations. Follow safety standards.
The unit must be properly earthed (groun-ded),
also with a non-metallic delivery pipe.
Make sure the frequency and mains voltage cor-
respond with the name plate data.
The control panel must contain:
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• a device for disconnection from
the mains (switch) with a contact
separation of at least 3 mm in all
poles;
• an adequate motor protector with
curve D for the current indicated
on the name-plate;
• a capacitor for the SDM single-
phase pumps, in accordance
with the data indicated on the
motors themselves.
For use in swimming pools (not
when persons are in the pool),
garden ponds and similar places,
a residual current device with
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IΔN not exceeding 30 mA must be
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installed in the supply circuit.
For pumps with power rating
above 11 kW, it is advisable to
Electrical diagram
provide the control panel with Y/ ∆
single-phase motors
or impedance starting.
Install electrodes to protect the
pump against dry running.
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SD, SDX, SDS_Rev19 - Operating Instructions
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6.5.1. Connection of cables
Feed cables have to be chosen on the basis of
power, distance, voltage drop and temperature.
For connection of cables in the well, use thermo-
shrinking insulation sheathes or other systems used
for submerged cables.
Before lowering the motor into the well, use
appropriate instruments to measure continuity
between phases and perform an isolation test
between each single phase and the earth conductor.
6.5.2. Operation with frequency converter
Adjust the frequency converter so that the limiting
values of min. 30 Hz and max. 60 Hz will not be
exceeded.
The maximum running up time from 0 to 30 Hz and
running down time from 30 to 0 Hz for frequency-
converter operation is 1 second.

7. STARTUP AND OPERATION

7.1. Preliminary checks before start-up of the
pump
Do not start-up the device in case of damaged parts.
7.2. First starting
OFF
ATTENTION: never run the pump dry, not even
for a short trial run.
Start the pump with the gate valve regulated to
minimum aperture and wait until the delivery pipe is
completely free of air.
With a three-phase motor make sure the direction
of rotation is correct.
For this purpose, with the gate valve at half-open
aperture position, check the pressure (with the
pressure gauge) or flow rate (sight check) after
starting. Switch off power, reverse the connections of
two phases on the control panel, re-start and check
the pressure or flow rate capacity again.
The correct direction of rotation will provide a
considerably greater and easily distinguishable
pressure and delivery capacity.
Make sure the sand residue present in the water
disappeares or is minimal.
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Never start or run the pump when the gate valve
has been opened too widely.
Make sure the pump operates within its rated
limits of performance and that the rated absorbed
current is not exceeded.
Otherwise, regulate the delivery gate valve or the
setting of any pressure switches.
ATTENTION: avoid long periods of operation with
closed discharge.
7.3. Generator supply
The switching sequence is of utmost importance.
If you do not apply this correctly, both motor and
generator may be damaged.
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Therefore:
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- AIways switch the generator on and off without load!
This means:
- Starting: aiways switch the generator ON first - and
the motor afterwards!
- Stopping: always switch the motor OFF first - and
the generator afterwards!
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