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5.2 Installation specifications: WARNING
Deep well.Make sure that the motor remains at least 2-3 meters above the bottom of the well.
To ensure correct cooling, the well's drawing filters must always be below the position occupied by the motor.
Check whether there are variations to the dynamic level in the well due to seasonal falling of groundwater levels or if the pump rating is too high for
the dynamic characteristics of the actual well.
Tank.
GB
Correct installation of the unit will include a pressure accumulator.
The limitations given for boosters will also apply if the unit is installed horizontally.
Booster.
Make sure that the pipes and air exhausts in the installation allow air pockets to be eliminated.
If the unit is installed horizontally, the motor must always remain immersed in the water even when not used. Always check that filling is complete if
this is not the case (consult section 5.1 'Preliminary inspections' for the relative procedure).
The suction pressure must never be more than 10 bar.
WARNING The minimum water flow speed around the motor should be guaranteed, on its whole length, through suitable installation conditions in
well or using a cooling sleeve.
5.3
Mechanical connections:
Proceed as described below if the motor must be assembled on the pump:
1) thoroughly clean the mating surfaces.
2) fix the motor in the vertical position and make sure that it is stable;
3) if installed, remove the strainer and filter from the suction casing of the pump;
4) lift the pump vertically and, after positioning it on the same axis as the motor and setting it in the correct angular position, slowly lower it, inserting
a screwdriver through the hole in the filter housing and into the milled part so as to mesh- the splined shaft and coupling more easily. In the
absence of a hole in the filter housing, turn the coupling with a tool in the shape of a drive shaft or using a screwdriver on the first impeller, taking
care not to chip it;
5) tighten the nuts evenly using the plate, when present, to close the cable routing zone and fit the filter back in place if used;
6) lock the Defender in place with the O-Rings, when present. If the motor has a second cable outlet at 90°, replace one of the Defenders with a
second plate to close the cable routing zone, when present;
7) fit the strainer back in place;
8) arrange the power cables under the protecting cable guard/s.SFlb
5.4
Electrical connections and relative information:
The electrical connections must be made by qualified personnel in strict compliance with all the installation regulations in force in the
country of use (standard CEI 64-8 in Italy) and as shown in the circuit diagrams in the manual and attached to the control panels.
All the yellow-green earth conductors must be connected to the earthing circuit of the installation before the other conductors are
connected, while they must be the last to be removed when the motor is electrically disconnected.
The free ends of the cables must never be immersed in water or wetted in any other way.
Insulation resistance measuring procedure:
Make sure that the motor cables are not connected to the electricity main;
Check the conditions of the cables;
If the environment is damp, clean the end of the power cable at the point in which it will be connected to the clamp of the test instrument;
If the motor has an output with 3 power cables, connect one of the terminals of the instrument (Megger) to the ends of one of the motor's power
cables and the second to the motor casing. If the motor has an output with 6 power cables, connect one of the terminals of the instrument to the
beginning and to the end of the same phase (e.g. : V1-V2) and the second to the motor casing;
Perform the insulation measurement test considering the following parameters: Max. test time 60 sec. Temperature 20°C. Test voltage 500V DC (a
long test time at high voltage can damage the motor winding wire insulation). If during the test the measured value is ≥ 500 Hohm for standard
green wire /PPC winding, ≥ 10 Hohm for PE2+PA winding, the motor winding can be considered electrically insulated and the test can also be
interrupted before 60 sec
After measuring, the phases must be briefly connected to earth so as to reset their potential;
If the motor has an output with 6 power cables, proceed by testing the other two power phases (e.g. : W1-W2; U1-U2);
Cable connection.
Connect the supply and earth cables as described in detail in Calpeda's specific technical instructions and then measure the
insulation resistance of the connection: minimum value with 500 V D.C. test voltage: 5MΩ, in air; 2MΩ in water.
If low insulation values persist in the presence of junctions between motor cables and power cables (risers), cut the junctions and
repeat the tests directly on the three motor cables as indicated above.
Cables in addition to the standard one supplied with the electric pump must not possess inferior characteristics (contact Calpeda
S.p.A. or check the type of standard cable in the sales catalogue).
The connection must withstand the maximum pressure to which it will be subjected, (e.g. the pressure exercised by the static level
of the water in the well) and the alternating temperatures caused by the work phases.
WARNING Poorly made connections can easily damage the motor and/or the supply cable. Consult pages 71 to 74 for details about the section of
the cable to use for the feeder conductors.
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