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5. INSTALLATION
The pumps can operate in a vertical or horizontal position.
The maximum flow 2,6 m3/h for 50 Hz and 3,5 m3/h
ATTENTION !
for 60 Hz must be espected. Beyon there is a risk of
reversal of the sense of the hydraulic thrust and of destruction of the
pump.
5.1 Mounting
- The borehole or pumping station must be in accordance with
accepted good practice.
- Check that water infeed to the borehole or well is adequate for
the capacity of the unit.
- The unit is lowered into position using a hoist with a cable and tri-
pod, or for heavy units, with a special truck-mounted winch for
boreholes.
- To ensure that the unit never runs dry, make sure that even in per-
iods of low water the water level never falls below the discharge
port.
- Make sure that the diameter of the tube inserted into the borehole
is constant and allows the unit to be lowered freely.
- Do not lower the unit on its power cord.
- Make the electrical connections between the conductors and the
motor power cord before lowering the unit.
- In its final position, the pump must be suspended at least 0.30 m
above the bottom of the borehole or well (See FIG. 4).
- The site data plate must be fixed in the immediate vicinity of the
wellhead so that the characteristics of the installation are always-
readily available.
- Before lowering (and during lowering in a deep borehole), the insu-
lation resistance of the motor and cord must be measured several
times (at least 2 Mohm).
5.2 Hydraulic connections (See FIG. 3)
INSTALLATION DIAGRAM
1 - IMMERSON pump D3/DB3
2 - Earthing electrode
3 - Dry-running electrode
4 - High electrode
5 - Motor power cord
6 - Dynamic level (PUMP ON)
7 - Static level (PUMP OFF)
8 - Protection box (including dry running)
9 - Network supply
10 - Pressure switch
11 - Bladder vessel
12 - Isolating valve
13 - Check valve
14 - Electride cable connected with the motor
15 - Connexion between cables (item 5 -14) fixed on threaded steel
rigid pipes 1".
- In case of flexible pipe the pump has to be supported with a cable
secured to both lifting eyes located on the delivery pump housing.
- The installation of a non-return valve (13) at the outlet of the bore-
hole (between pump and installation is recommended).
- Plan a pressure gauge contactor and insulation valve at the bore-
hole or well outlet.
5.2 Electrical connections
The electrical connection and checking work must be done
by a licenced electrician and in accordance with the local
standards in force.
- Check the line power voltage.
- Use a cable meeting local standards.
The maximum cable length depends on the current rating of
the motor and the voltage drop acceptable at that length.
Maximum cable length (for direct starting)
Motor
kW
1
1-phase
0,37
50
1-230V
0,55
38
50/60Hz
0,75
30
0,37
240
3-phases
0,55
164
3-400V
0,75
133
50/60Hz
1,1
97
Weight / meter (kg/m)
Warning ! An electrical connection error would
ATTENTION !
damage the motor.
- Do not forget to earth.
- The motor must be protected by a circuit-breaker providing thermal
and magnetic protection.
Connection to single-phase motor :
a : black - b : blue - c : brown - d : yellow/green
(See Fig. 1 - 2 and diagram in starting box).
(See FIG. 1) : Single-phase motor type MP
(See FIG. 2) : Three-phase motor type T4
6. STARTING
6.1 Direction of rotation
Single-phase 230 V
No risk of inversin.
Three-phase 400 V
To determine that the unit is turning in the right direction, simply
check the discharge pressure, bearing in mind that the pressure is
highest in the right direction.
Or measure the pressure with the discharge valve closed and com-
pare it to the specified pressure.
If there is a reversal, interchange two phase wires in the box or on the
circuit-breaker.
The pressure measured at the borehole outlet with
ATTENTION !
the valve closed is the pump head at zero flow less
the height between ground level and the water level.
6.2 Notes for the first starting up
In a new borehole, during the first starting up have the pump turn
during about 10 minutes, vale very lightly opened. So we will avoid
that the borehole is not overloaded by a too quick and too strong
output and that important quantities of sand are not due to this fact
driven which would cause an important wear of the pump. So, we
can go on open slowly the valve.
6.3 Frequency of starts
To avoid that the motor abnormally overheats it is requested to obser-
ve a frequency of 20 switching n per hour at the maximum with an
interruption of 3 minutes at least.
6.4 Running with semi-opened valve
If for whatever reason, a immerged group must turn in continuous ser-
vice with a semi opened valve, it is necessary to insure a minimum
output of 10% of the output at the point of the best efficiency in order
to avoid a pointless overheating of the motor.
6.5 Running with closed valve
The pump must run only 2 minutes maximum with closed valve
because the exterior cooling flow not existe, the water inside the
pump overheats very quickly and transmits this heat to the motor and
can damage it.
8
Cable (mm2)
1,5
2,5
4
6
75
125
-
-
57
95
152
-
45
75
120
174
-
-
-
-
246
-
-
-
200
333
-
-
146
244
390
-
0,2
0,25
0,3
0,4
10
-
-
-
-
-
-
-
0,65
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