SAER Elettropompe IR Serie Manual De Empleo página 25

CONNECTING THE PIPES (Fig. )
The pump maximum working pressure can't be bigger than the PN pump nominal pressure.
WARNING!
Pipes must be suitable for the pump maximum working pressure.
The intake and delivery pipes must not transmit forces to the pumps/ electric pump due to their own weight
and/or heat expansion, at the risk of possible liquid leaks or breaking the pump. For this reason, the pipes
must be supported by anchorages and, if necessary, expansion joints must be inserted in the appropriate
WARNING! positions.
Refer to TAB.II for permissible forces and moments at pump nozzles.
Pumps don't have to transmit vibrations to the pipes, therefore insert anti-vibration couplings in delivery and, if
it is possible, in suction.
Install non return valve on the discharge side.
WARNING!
Install gate valve both in suction and discharge side.
The intake pipe must always be perfectly air tight and not positioned horizontally, but must always rise towards the pump. On the other
hand, in the case of operation under water head, the intake pipe must always slope down towards the pump. For this reason, any fitting
cones 1 must be eccentric and oriented to avoid the formation of bubbles during priming or operation.
It is a good idea to protect the pump by inserting a filter on the intake pipe; especially during the initial period of operation, the pipes
release slags capable of damaging the pump seals. The filter must have a mesh less than 2 mm and a free passage area of at least 3
times the section area of the pipe so as to avoid excessive losses of head.
To adjust the flow rate, it is a good idea to install a shutter on the delivery pipe.
The diameter of the pipe must be such that the speed of the liquid never exceeds 1,5 - 2 m/s at intake and 3 – 3,5 m/s at the delivery.
In any case, the diameter of the pipe must not be less than the diameter of the pump openings. The suction piping must be absolutely
hermetic and for the catalogue data it must have the diameters of TAB.I (pipes of smaller diameters reduce the delivery values).
After having performed the controls listed, connect the pipelines to the pump.
AUXILIARY CONNECTIONS
WARNING!
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ELECTRICAL CONNECTIONS
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CHECKS ON THE ELECTRICAL SYSTEM
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Verify the presence and proper installation of the necessary auxiliary connections.
The connection to the power grid must be done in the respect of the local and national standards of the
electric system of the place where the pump is installed.
Furthermore, respect the connection diagrams supplied with the motor and with the control panel.
Perform the earth connection before all the other connections.
Verify the correct operation of the electric equipment (control panel etc...).
Verify that the electrical system corresponds to the IEC 60204-1 standard and to the local and national
standards.
Verify:
- the existence of an earth connection,
- the presence of an omni-polar switch disconnector that can disconnect all the feeding cables to
insulate the motor in case of malfunction or small maintenance operations (the disconnection
device from the supply mains must be over-voltage III category)
- the presence of an emergency stop button.
- The presence of a residual current device (RCD) with rated residual operating current not exceeding
0,03 A.
- the presence of a thermal protection device adjusted on a maximum absorbed current not higher
than 5% the current stated in the label and with an operating time lower than 30 seconds.
The feeding cable must have adequate section in order to avoid a voltage drop greater than 3 % of the
nominal voltage and to operate within the rated temperature.
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