8
Installation and assembly
Before installing the frequency inverter, carefully read the whole of this manual and consult the safety
regulations in force in the country in which it will be used. The installation must be carried out by a qualified
technician.
a. Installation of the inverter:
• It must be installed in a well-ventilated area, protected from damp and direct exposure to the sun
and rain.
• Before making the electrical connections, ensure the cable used to provide power to the inverter
is not live.
• Carefully verify the electrical data indicated in the specifications plate of the inverter before con-
necting the electric current.
• The electric power cables to the inverter, and from the inverter to the pump, must be of the cor-
rect size for the nominal consumption of the motor and the length of cable required, according
to the regulations in force in the country in question. A table with the maximum recommended
lengths according to the cross-section of the electrical cable can be found below.
Secon of inverter input (mm2)Secon of inverter output (mm2)
1.5 2.5 41.5 2.5 4
Maximum distance (metres) Maximum distance (metres)
MT 2200 8 19 35 12 28 51
TT 4000 46 76 120 49 81 134
Each interface cable length should be shorter than 3 meters.
Use the appropriate cable glands to aach the cable.
Also ensure that the grid has electrical protection; a high-sensitivity dierential switch (30mA, class A for
domestic applications, class B for industrial applications) is particularly recommended.
The type B should be installed for all the residual current-operated protective or monitoring from an inverter up
to the supply voltage.
In addition to the dierential switch, it is advisable to install magneto thermal protection and a voltage
disconnect switch to control the power supply to each inverter individually.
Ground must be connected properly. If the ground is not connected, the electric show or fire might be
happened.
b. Installation of pressure units with an inverter:
The multiple pump unit must always consist of pumps that are the same and that, therefore, have the
same power and hydraulic performance. Failure to comply with this point can cause the pump system to
malfunction.
For the inverter to work, it is essential to use a pressure transducer (4-20 mA).
The location of the pressure transducer must always be as close as possible to the pump unit, as close
as possible to the membrane expander, and always aer the general retention valve of the pump unit it
is essential to install a general cut-o valve for the pump unit, aer the physical location of the pressure
transducer.
If there is more than one pressure transducer in a multiple pump unit (more than one inverter with a pressure
transducer connected), the network of interconnected inverters will decide automatically, and with prior
reliability tests of the readings of the existing transducers, which is the transducer that will be used as the
general pressure sensor for the whole group.
