Saci E-MOTION MT2-11A Manual De Instalación, Uso Y Mantenimiento página 28

EMOTION MT2-11A
EMOTION TT3-11A
- Also ensure that the grid has electrical protection; a high-sensitivity differential switch (30 mA, class A for domestic
applications, Class B for industrial applications) is particularly recommended.
- In addition to the differential switch, it is advisable to install magnetothermal protection and a voltage disconnect
switch to control the power supply to each frequency converter individually.
b) Installation of pressure units with a frequency converter:
- 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 frequency converter 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 after the general retention valve of the pump unit It is essential to install
a general cut-off valve for the pump unit, after the physical location of the pressure transducer.
- If there is more than one pressure transducer in a multiple pump unit (more than one frequency converter with a
pressure transducer connected), the network of interconnected frequency converters 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.
- If the designated transducer functions erroneously, the set of frequency converters will decide to automatically
change the principal transducer for another that provides more precise readings. The rest of the transducers will
remain on standby ready to be used when required.
Section of frequency converter input (mm
1.5 2.5
Maximum distance (metres)
8 19
46 76
) Section of frequency converter output (mm
2
4 1.5
Maximum distance (metres)
35 12
120 49
26
ENGLISH
)
2
2.5 4
28 51
81 134