Starting; Preliminary Information Before Starting - Rovatti Pompe 4ES Serie Manual De Uso Y Mantenimiento

Manuale d'uso e manutenzione
Instructions for use and maintenance
Manuel d'utilisation et d'entretien
Betriebs-und Wartungsanleitung
Manual de uso y mantenimiento
When using plastic pipeline it's necessary to support permanently the group by suitable antiwear unextendible cables (pla-
ted steel – stainless steel – polyester etc.).
Each 2-4 meter fasten the electric cables to the rising pipe using the suitable waterproof clamps (fig. 7 pos. 10). When lowering the pump in
the well, measure the insulation resistance following the notes reported on the electric motor documentation.
The installation (fig. 7) is completed when the regulating valve and the non-return valve are mounted and the electric pump is setted
in the following conditions:
- Positioned at min. 2 mt from the bottom of the well (pos. C).
- Positioned at min. 1 mt above the well suction strainer (pos. D): this is essential to ensure motor cooling (see motor cooling conditions).
- With the water dynamic level at min. 2 ÷ 2,5 mt above the suction strainer of the pump (pos. B); the dynamic level must, in any case, satisfy
the NPSH required by the pump.
Consider attentively the problems due to the seasonal dropping of water table and to the excessive pumping in comparison
with the well capacity.
7.

Starting

7.1

Preliminary information before starting

For starting operations refer also to the instructions provided by the motor manufacturer. Before starting the electric pump
carry out a final check on the hydraulic connection and on the electrical equipment and relevant ratings.
When the electric pump is installed into in particularly deep wells, the column pipe must be filled with water before running, to avoid the
risk of rotor rising during starting. If limits are observed, the electric pump will operate without vibrations or anomalous noises. Keep
the hydraulic and electric working conditions within the values shown on the plate.
Action
If the electric motor is fitted for rotating in both directions, start the
pump with gate valve slightly opened in order to check the correct
rotation according to pressure indicated on the pressure gauge
If rotation is wrong, pressure will be much lower, but the
absorbed current might be higher than foreseen. To invert
rotation in three-phase motors swap over two of the phase wires
If the electric motor is fitted for rotating in one direction only, for
the correct electric connection refer to instructions indicated on
the motor manual; even in this case starting must be done with
gate-valve slightly open
With the pump functioning, gradually open the gate-valve
until you reach the required performances, checking with an
amperometer that the current absorbed does not exceed the
value shown on the motor plate
If necessary lower the current absorbed (Amperes) below the
value shown on the motor plate, reducing the capacity by closing
the gatevalve and, afterwards, setting the protection relays
accordingly. The relay setting should never exceed the value
indicated on the motor plate
Check that the capacity obtained is complying with the cooling
conditions of electric motor. Never let pump functioning with
0 capacity (gate-valve closed) more than 2 minutes
On first startings of pump, it's necessary to check that
the pumped water is not cloudy due to sand or silt. In the
affirmative, it's necessary to reduce immediately the pump
capacity, closing the gate-valve, until the water is clear. This
situation must be obtained in a short time, max. 8-10 min.;
otherwise, to avoid heavy damages to the pump, it's necessary
to effect a further cleaning of the well using a pump suitable to
this purpose
EN
Note
Correct rotation according to pressure indicated on the pressure
gauge. If rotation is correct, the pressure gauge will indicate the
same pressure shown on the catalogue to a nearby 0 delivery.
Worthy to remind that the height between pressure gauge and
dynamic level must be added to the pressure value readable
on the pressure gauge
Never let pump functioning in wrong direction more than
3 minutes
Elettropompe sommerse da 4"
4" electric borehole pumps
Electropompes immergées 4"
Elektrounterwassermotorpumpen 4"
Bombas eléctricas sumergidas de 4"
MGES4205R2
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