EBARA SB3 Use And Maintenance Instruction Manual page 6

6.2. LIMITS OF USE
Well
arthesian depth DN 80 mm (3").
clean water or lightly charged, max temperature 25°C;
Liquid
sand content 40 g/m3.
continuous or intermittent max. 20 starts/hour well
Service
GB
distributed. Max voltage drop 3% on nominal data voltage.
7. INSTALLATION, DISMANTLING
AND TRANSPORT
7.1. GENERAL ARRANGEMENTS FOR INSTALLATION
ATTENTION
• The well must be right, without sand or sediments, if not
provide to bleed it.
• Before plunging the group check the sense of rotation of
the motor: it must be anticlockwise looking from the shaft
exit side. For water cooled motors also control the topping-
up of the liquid according to the motor manufacturer's
instructions.
• Handle the pump (12) carefully, don't hurt it and don't
make it fall. Apply safety and accident-prevention rules in
force in the building yards when screwing piping (9) and
getting down the group. Be careful to avoid overtunings
that could hurt persons and plants.
• Tighten the threads of the discharge piping; for safety
purposes it is better to execute some spot-welding at the
coupling level. With plastic piping use proper connections.
• Anchor the group with resistant, antioxidant cables (8),
suitable to bear the weight of the machine with discharge
piping full of water.
• When getting down the pump, link the electric cables to
the discharge piping, fix them with plastic hose clamps
(each 3 mt.), be careful: don't damage them and NEVER
use them to uphold the group.
• If the diameter of the well is quite bigger than the electropump,
it is better to install another jacket, external to the motor;
this is to grant that the cooling water speed is ≥ 0,1 m/s.
• Place the electropump keeping it away from the bottom of
the well (X); this is to avoid a bad cooling due to sediments:
the dynamic level (A) of the well must not influence its
work.
• Equip the installation with electrical protections and
automatic level controls (3) (see chap.8 ELECTRICAL
CONNECTION).
• Always install, at least, one non-return valve (6) at the
surface to protect the pump against water hammers due
to the plant before the valve.
The horizontal installation of the group must be specified to
the order, bearing in mind that: the pump axis must be 0,5
m over the bottom, the air of the plant could easily evacuate,
an external non-return valve must be installed.
7.2. MOTOR COUPLING
• Check the free rotation of the motor-pump and the
cable condition, if not fitted, block the connector into
its seat with a proper key (5 Kgm). Clean the surfaces
to be coupled.
• Keep out the suction screen and cable protection, put
the suction head of the pump in correspondence of the
6
motor prisoners and cable cross; couple the grooved
joint of the pump to the motor shaft, then fix it with nuts
as standard ( 3 Kgm).
• Make sure that a clearance exists on pump joint by
using a screw-driver appealing to the motor, reassemble
the suction screen and cable protection and insert the
motor cable in its own seat.
7.3. DISMANTLING
In order to handle and dismantle the electropump you should:
a) take off the power supply;
b) uncouple the discharge and suction piping (if any) if
too long or bulky;
c) loosen the screws, if any, holding the electropump on
the supporting surface;
d) hold the feeding cable, if any;
e) lift the electropump with suitable means according to
its weight and dimensions (to be seen on the plate).
7.4. TRANSPORT
The electropump is packed in a carton or, depending on
its weight and dimensions, it is fixed on a wooden pallet;
however, transport does not present many difficulties.
In any case, check the total weight imprinted on the box.
8. ELECTRICAL CONNECTION
8.1. PROTECTIVE DEVICES
• ALL THE CONNECTIONS MUST BE EXECUTED
ACCORDING TO THE LAW BY A QUALIFIED TECHNICIAN.
• ALL THE ELECTRICAL MASSES MUST BE CONNECTED
TO THE EARTH OF THE PLANT ACCORDING TO
THE ELECTRICAL STANDARDS IN FORCE IN YOUR
COUNTRY: THE INSTALLER SHALL BE THE SOLE
RESPONSIBLE FOR IT.
• FOR THE THREE-PHASE AND SINGLE-PHASE TYPES,
WE RECOMMEND INSTALLING A HIGH SENSITIVE
DIFFERENTIAL SWITCH (0.03 A).
After installing the unit check again the feeding cable
following the CABLE CONNECTION instructions and
connect it to the control panel (1) that must be fitted,
according to the actual rules, with:
• An omnipolar device for switching-off/separation of
the net (minimum opening contacts 3 mm).
• A protection against short circuits (Am fuse) and
magnetothermics, rated in compliance with the
current plate.
• Possible devices against: lack of phases, electric
dissipations, lack of water, atmospheric discharges
and functioning-failure indicators.
IMPORTANT: ALL THE ELECTRIC MASSES MUST
BE CONNECTED TO THE EARTH OF THE PLANT.
8.2. CABLE CONNECTION
• Joint the motor cable to the line cable (10) with high
insulating system (thermotightening or dielectric resin).
Choose the standard feeder (2) according to: voltage,
power, length, type of service (insulation ≥ 1kV).
• When finishing the cable connection, before plunging
the electropump, verify the followings by using suitable
instruments: the CONTINUITY among phases, between
the earth conductor and motor mass, the INSULATION
between phases and earth.