Noise - salmson Alti-Nexis V Serie Manuel D'installation Et Mise En Service

Depending on the requirement and the type of
control, the control device switches the pumps on,
switches them in, or switches them off. If pumps
with built-in frequency converters are used, the
speed of one or more of the pumps is changed
until the control parameter settings are achieved
(a more precise description of the control mode
and the control process is given in the installation
and operating instructions for the control device).
The total delivery volume of the system is distrib-
uted over several pumps. This has the big advan-
tage that the system output is adapted very
precisely to the actual demand and the pumps are
operated in the most favourable performance
range in each case. This design delivers a high level
of efficiency and an economical energy consump-
tion for the system.
The first pump that starts up is called the base-
load pump. The remaining pumps needed to reach
the system operating point are called peak-load
pump(s). If the system is configured to supply
drinking water according to DINb1988, one pump
must be designated as a standby pump, i.e.bat
maximum extraction, one pump is always decom-
missioned or on stand-by. To ensure that all the
pumps are used equally, the control unit cycles the
pumps continuously, i.e. the order of switching on
and the allocation of the base load/peak load or
standby pump functions change regularly.
The diaphragm pressure vessel (total content
approx. 8 litres) which can be installed as a retrofit
kit accessory option on systems with Nexis advens
pumps) performs a certain buffering function on
the pressure sensor and prevents oscillation of the
control system when switching the system on and
off. It also guarantees low water extraction (e.g.
for very small leaks) from the storage volume at
hand without switching on the base-load pump.
This reduces the switching frequency of the
1 pump
2 pumps
3 pumps
4 pumps
(*) Values for 50 Hz (fixed speed) with tolerance of +3 dB(A)
Lpa = workplace-related emission level in dB(A)
Installation and operating instructions Alti-Nexis V/-Nexis VE/-Nexis advens
0,37 0,55 0,75
56 57 58
59 60 61
61 62 63
62 63 64
pumps and stabilises the operating status of the
pressure boosting system.
CAUTION! Risk of damage!
To protect the mechanical seal or slide bearing,
do not allow the pumps to run dry. If the pumps
run dry they may develop leaks.
Various kits are offered as accessories for direct
connection to the public water mains as protec-
tion against low water level (WMS)b(14) (Fig.b6a
and 6b). Each kit incorporates a built-in pressure
switchb(22). This pressure switchbmonitors the
supply pressure and if the pressure is low it sends
a switching signal to the control device.
An installation point for this purpose is provided as
standard at the inlet manifold pipe.
In the case of an indirect connection (system sep-
aration through non-pressurised break tank), a
level-dependent signal transmitter must be pro-
vided and installed in the break tank as a dry-run-
ning protection device.
For existing onsite tanks, the Salmson range offers
various signal transmitters for retrofitting (e.g.
float switches WA65 or low water electrodes with
level relays).
WARNING! Health hazard!
Only materials that have no adverse effects on
the quality of the water may be used for drink-
ing water systems!

6.4 Noise

Pressure boosting systems are supplied with dif-
ferent types of pumps and a variable number of
pumps, as listed under point 5.1. No specific over-
all noise level can therefore be listed here for all
variants of pressure boosting systems.
In the following overview, pumps of the standard
series Multi V/Nexis V up to a maximum motor
power of 37 kW are taken into account without
frequency converters:
Nominal motor power (kW)
1,1 1,5 2,2
58 58 62
61 61 65
63 63 66
64 64 68
3 4 5,5
63 68 69
66 71 72
68 73 74
69 74 75
English
7,5
69
72
74
75
37