Italtecnica NETTUNO 3P-13A User manual

EN
Rel. 3.2 EN-CZ 03 /2017
Owner’s manual
3P –13A
Nettuno
3P –9A
3P –6A
Návod k obsluze
CZ

2
CAUTION
The manufacturer guarantees this product for a period of 24 months as of the date of sale; if returned, the device must be accompanied by
this handbook, with the installation date entered on the last page.
The guarantee is forfeited in the event of the following: the device is tampered with, disassembled or damaged due to mishandling and/or
incorrect installation; the device is put to any other use than the one it was intended for; the device is installed in unsuitable environmental
conditions or connected to a non-compliant electrical system.
The manufacturer cannot be held responsible for any kind of damage to people and/or things ensuing from failure to install the necessary
electrical safety devices upstream of the device, or as a result of unprofessional installation.
The installation and servicing of this device must be performed by specially trained personnel with the ability to understand the entire
contents of this owner’s manual.
For all operations required to be carried out with the cover removed, the device must be disconnected from the power supply.
Even though there should not be any reason to remove the board, if you do so, remember that some of its parts remain live for a few
minutes after the unit has been disconnected from the mains.
The manufacturer cannot be held responsible for any kind of damage to people and/or things ensuing from the failure of any internal safety
devices to intervene, with the exception of compensation for the device itself if still under guarantee.
This equipment complies with the ROHS 2011/65/EC directive.
The symbol of the crossed out bin means that to safeguard the environment the equipment cannot be disposed of with other
household waste at the end of its lifecycle.
The equipment and packaging must be disposed of according to the local regulations.
OVERALL SIZE - DIMENSIONS –IDENTIFICATION
READ THIS HANDBOOK CAREFULLY BEFORE INSTALLING OR STARTING THE DEVICE.

3
DESCRIPTION
Nettuno is an electronic device, employing inverter-based technology, which controls electric pump stopping and starting functions.
Thanks to the particular type of technology used, it can modulate the frequency (Hz) of the motor’s input current to adjust the speed
(rpm) according to the water demand by the system.
This way, the value of the pressure reaching the user appliances is maintained constant all the time and the motor's absorption is always
proportional to the actual system requirements, resulting in notable energy savings over time.
SPECIFICATIONS
NETTUNO 3P-13A
NETTUNO 3P-9A
NETTUNO 3P-6A
Power mains supply:
three-phase, 400Vac ±10% - 50/60Hz
Motor output
three-phase, 400Vac
Maximum motor power
7.5 kW –10 HP
5.5 kW –7.5 HP
3.7 kW –5 HP
Maximum motor phase current
13 A (rms)
9 A (rms)
6 A (rms)
Cooling
Forced air ventilation
Air
Analogue inputs
4÷20mA (pressure sensor) + 0÷10V (aux.)
Digital inputs
3 inputs (enable, error, 2nd set point )
Digital outputs
2 programmable relays (24V –2A max.)
Degree of protection
IP 44
Weight
6.430 Kg
Dimensions
213x263x191 mm
Type of action
1.Y (according to EN 60730-1)
Operating ambient temperature
+0° C to +40° C
+0° C to +45° C
FEATURES
Constant pressure due to electric pump speed regulation
Energy savings due to less pump absorption
Gradual pump start and stop reduces hammering
Protection against dry running in the event of water shortage during intake
Automatic reset in the event of dry running, with autonomous clearing of error condition
Efficient leakage monitoring to protect pump in the event of repeated restarts
Anti-seize function
Intelligent overload cut-out management for a longer duration of the inverter
Digital display of pressure, current, voltage and frequency
Operation/error status signalling via LEDs and on-screen alerts
Auxiliary inputs and outputs for remote control and status signalling
Possibility of interfacing more devices as part of the pressurisation units (two to eight)
PROTECTIONS
Dry running
Overpressure
Power supply under-voltage
Power supply over-voltage
Unbalanced load
Output terminal short circuit
Amperometric sensor on motor output
Internal overheating in inverter (ambient temperature and IGBT temperature)
Significant leakage with continuous motor pump restarts
EMC
This product has been tested according to the standards stated in the EC declaration of conformity in one of the typical conditions of use,
using shielded cables both on input and output (motor cable 15 metres, without auxiliary connections). However, experience has shown
that significant variations in the level of EMC disturbance can occur when the type and length of cable used is changed, as well as their
position, type of motor used etc.
If other equipment is subject to disturbance, contact the manufacturer to assess additional solutions to reduce electromagnetic
disturbance.

4
INSTALLATION
DEVICE FIXTURE:
Nettuno is supplied with a special fixing bracket to enable mounting directly on a wall, or the option of fixture to a horizontal pipe using
the optional kit.
On both wall-mounted and pipe-mounted versions, ensure that fixture is secure and that the pipe or wall is sufficiently strong to
withstand the weight of the device.
Always install indoors, in an area protected against dust and water. Nettuno must be installed at a higher point than the pump to avoid the
risk of immersion in the event of flooding.
The device must never be installed in confined spaces that can reduce ventilation and therefore cooling of the inverter.
WALL MOUNTING
Nettuno can be mounted on a wall or other flat surface by means of the bracket and screws supplied. For simple installation of the
product, proceed as described below.
1) Fix the bracket to the wall by means of the 4 screws 2) Pre-assemble the fixing screws on the rear side of Nettuno,
supplied. Check to ensure correct horizontal alignment. leaving a space of at least 3mm under the screw heads.
3) Fit Nettuno onto the bracket, passing the 4) Tighten the rear screws fully down on Nettuno.
screw heads on the larger holes and then slide
downwards.

5
PIPE-MOUNTING
Nettuno can be mounted onto a horizontal pipe by means of a kit of fixing collars (optional, to be ordered separately). 4 different collar
sizes are available, as shown in the diagram below.
For simple installation of the product, proceed as described below.
1) Fix the bracket to the pipe by means of the “U-shaped” hooks and 2) Ensure that the bracket is securely fitted on the pipe and cannot
4 bolts supplied. See fig. 6 for selection of the holes. rotate.
3) Pre-assemble the fixing screws on the rear side of 4) Insert Nettuno onto the bracket, passing the
Nettuno, leaving a space of at least 3 mm under the screw heads on the larger holes and then slide
screws. downwards.
PIPE MOUNTING KIT
CODE
DESCRIPTION
KIT-TUBO114
Kit for fixture on pipes of 1” ¼
KIT-TUBO112
Kit for fixture on pipes of 1” 1/2
KIT-TUBO200
Kit for fixture on pipes of 2”
KIT-TUBO212
Kit for fixture on pipes of 2” 1/2

6
5) Tighten the rear screws fully down on Nettuno. 6) The bracket is designed for fixture of various sizes of “U-shaped” hooks,
refer to the diagram to select the correct version.
HYDRAULIC CONNECTION
The 4÷20mA pressure sensor must be connected to the system delivery, preferably far from areas subject to turbulence (bends, bypasses,
branches, etc.) to ensure optimal stability of the measured signal.
It is a compulsory requirement to install an expansion tank with a capacity of at least 2-5 litres to ensure correct shutdown of the pump
and limit restarts caused by any small leakages which are common in most systems.
The pre-charge value of the tank must be suitable for the pressure values set. This will also help to keep the operation constant in
applications where water requirements are modest (e.g. for washing machines, toilet flushing systems, etc.).
The system must also be equipped with a non-return valve to prevent the return of fluid to suction at the time of pump shutdown. In the
case of multiple installations, it is recommended to install a valve on suction for each pump.
CAUTION: when the pump stops, the conduits are still pressured so a valve must be opened to bleed the system before any work is
carried out.
INSTALLATION IN PUMPING UNITS WITH MULTIPLE PUMPS:
Nettuno can be used to create pressurisation units with a maximum of 8 pumps, each controlled by an inverter. The inverters are
connected by means of a RS 485 serial connection. Each inverter is assigned an address, from 1 to 8, for identification in the serial bus.
To reduce costs, there is no need to install a pressure sensor for each inverter; a single transducer is sufficient, connected to any one of
the inverters (the address of the device hosting the pressure sensor must be configured on the software of each inverter). Also any
auxiliary 0-10 V control or digital input signal must be connected to a single device. Serial communication deals consists in sharing the
data of the pressure sensor and digital inputs among the various connected inverters.
RS 485
PRESSURE SENSOR
RS 485
DIGITAL INPUTS
(FLOAT, TIMER, ETC.)
ADDRESS 1
ADDRESS 2
ADDRESS 8
2” ½
1” ¼
1” ½
2”

7
ELECTRICAL CONNECTION:
CAUTION:
- all wiring up must be carried out by specially trained personnel
- an incorrect motor connection could result in damage to the device or the pump motor.
- failure to comply with what is stated in this paragraph may cause serious damage to things and/or serious injuries to people,
and the manufacturer declines all responsibility.
- if the power supply cable or the cable between Nettuno and the electric pump is damaged, only the manufacturer of the device,
its appointee or equally qualified personnel can replace it; this is to prevent risks to things and people.
Fit the electric wires into the relative wire clamps, making sure the correct assembly order is maintained for all the components. Secure
the threaded nuts tightly enough to prevent the wires being pulled or turned from the outside.
Use cable clamps in metal for connection of the power line and those in plastic for connection of any I/O (auxiliary inputs and outputs).
The metal plates located in the vicinity of the cable clamps can be used
to connect the shielding of the cables and thus ensure correct continuity
of the shielding itself with the heat sink.
POWER INPUT
MOTOR
OUTPUT
AUXILIARY
INPUTS/OUTPUTS
SHIELDING
CONNECTION

8
LINE CONNECTION
Power supply: three-phase 400 Volt 50/60Hz.
The electrical system to which the equipment is connected must comply with the safety regulations in force and must therefore be
equipped with:
- an automatic magnetothermic switch with high breaking capacity and with a trigger current proportional to the capacity of the pump
installed
- earthing with total resistance in conformity with local standards and in any case never over 100Ω
If the device is used in swimming pools, fountains or garden ponds, an automatic differential switch of the “A” type (with IΔn=30mA)
must always be fitted.
The system comprising Nettuno and an electric pump is considered a “fixed system”; it is therefore advisable to make arrangements to
prevent the device being disconnected from the power line it was originally connected to and mistakenly reconnected to another source
of power not equipped with the electrical protection required.
Always install, upline of the inverter, a device that ensures omnipolar disconnection from the mains with a contact opening gap of at
least 3 mm.
Before making the electrical connection, the cables must be prepared with special crimp terminals (fork-type). The terminals must be
crimped by specially trained personnel, using proper crimping tools.
After inserting the cable in the metal cable clamp, coil the three power cables (U,V,W) around the ferrite core supplied, as shown in the
images below. This preparation is essential to reduce electromagnetic disturbance. The earthing wire must not be wound around the
ferrite core, but connected directly to the terminal board.
Connect the earthing wire to the corresponding terminal. Then proceed with the connection of the device power wires to the terminal
board marked with the letters U, V, W as shown in the image below.
The recommended cable section is 2.5mm2.
The type of wire must be selected according to the conditions of use (domestic, dry or wet).
W
V
U
U
V
W
POWER SUPPLY
TERMINAL
BOARD

9
ELECTRIC PUMP CONNECTION
Before making the electrical connection, the cables must be prepared with fork-type crimp terminals. The crimp terminals (fork-type)
must be crimped by specially trained personnel, using proper crimping tools.
After inserting the cable in the metal cable clamp, connect the motor cables to the terminal board marked with the letters U’,V’,W’ as
shown in the image below. Then proceed with connection of the earthing wire to the corresponding terminal.
The device is fitted with an output short circuit protection.
The recommended cable section is 2.5mm2for cable lengths from 2 to 30 metres. Longer
cables, though admissible, have not been tested according to the EMI/RFI standards and
must be evaluated by the manufacturer.
The type of wire must be selected according to the conditions of use (domestic, dry or wet,
indoor or outdoor installation).
Where an excessive cable length (over 30 metres) is used, it is recommended to insert a
dV/dT filter to limit peak current voltage and for motor, especially windings, longevity.
Also observe the installation limits as declared by the manufacturer of the electric pump
connected to Nettuno.
AUXILIARY INPUT AND OUTPUT CONNECTIONS
CAUTION: The remote connections are insulated from the network power by a “reinforced” type insulation (reinforced
insulation according to EN 60730-1). Therefore it is recommended to make electrical connections with a type of cable that
guarantees double or reinforced insulation, using insulated voltage-free contacts for the digital inputs.
Insert the cables of the auxiliary devices via the central cable clamps in
plastic. Use the relative cable guides to keep wiring tidy.
Nettuno has various auxiliary connections located on the I/O board. The following diagram identifies the various connections.
MOTOR OUTPUT
TERMINAL
BOARD
CABLE
GUIDE
CABLE CLAMPS FOR
AUXILIARY INPUTS
4÷20mA PRESSURE
SENSOR
0-10V ANALOGUE
INPUT
DIGITAL RELAY OUTPUTS
SERIAL PORT
RS 485
SERIAL PORT
RS 485
DIGITAL INPUTS

10
4÷20mA PRESSURE SENSOR
An external pressure sensor (optional, code no. TRPR-016-420MA) with 4÷20mA signal
can be connected to Nettuno to obtain a closed loop pressure control system. The speed of
the electric pump is regulated according to the effective demands of the system to maintain
constant pressure.
The power supply voltage of the sensor is 10Vdc. The use of 2-wire transducers is
recommended, connected as shown in the diagram alongside (red wire +, black wire -).
The sensor cable shielding, if present, can be connected to the GND terminal to reduce
interference on the sensor signal itself.
The device is compatible with pressure sensors with a scale from 0-6Bar to 0-16Bar, or
from 0-100 PSI to 0-250 PSI.
0-10V ANALOGUE INPUT
Nettuno operation can also be controlled via a 0-10V analogue signal. The speed of the pump
is regulated according to the voltage value on input, considering that 0V corresponds to 0 Hz
and 10V corresponds to the set maximum nominal frequency of the pump (50 or 60Hz). The
pump is stopped when the control voltage value corresponds to a frequency value below the
parameter set as the stop frequency (factory setting 35 Hz).
DIGITAL INPUTS
Nettuno has 3 digital inputs, assigned with the following functions:
-I.1 = input for dual set point ; if the function is activated via the menu, the inverter
uses the second pressure set point value as reference for operation at constant
pressure, when the contact is switched between terminal C (common) and input I.2.
This can be used to control a different operating pressure value during operation.
-I.2 = input for external enabling; if the function is activated via the menu, the
inverter only starts up if the contact is switched between terminal C (common) and
input I.1. This can be used for connection of a float, timer etc.
-I.3 = input for error; if the function is activated via the menu, the inverter blocks
the motor when the contact is switched between terminal C (common) and input I.3.
The message "external error" then appears on display. This can be used for an
external block signal, for example from a flooding sensor or float.
The three digital inputs can all be configured via the software as NO or NC; if the input is set
to OFF their functioning is completely ignored.
Refer to the parameter settings section for further details.
DIGITAL OUTPUTS
Two digital relay outputs are available for signalling operation status. The relays can be
configured via the software independently, to perform one of the following functions:
-error signalling
-pump running signal
-control of an electric pump at fixed speed, connected directly to the mains via a
power relay
Refer to the parameter settings section for further details on configuration of the digital
outputs.
RED
BLACK
+10V
0V (GND)
SIGNAL

11
RS 485 SERIAL CONNECTION
Up to a maximum of 8 inverters can be connected to the RS 485 serial port to create multiple pump
pressurisation units.
There are two terminal boards on each device for the serial connection, to enable cascade connections
of multiple inverters, as shown in the figure alongside.
A non-shielded cable with a section of 4x0.5mm2is recommended for this connection.
To make the connection, connect the terminals “+”, “-“, “A” and “B” of one device to the same
terminals of the next device, and continue in the same way until all inverters are connected in the
same communication bus.
No special terminal at the end of the bus is necessary.
CAUTION: after connecting the devices to one another, they should be assigned an individual
number to identify their address in the serial bus. Each device must be assigned a different
number; otherwise, if several devices have the same address, the serial communication will
overlap with loss of transmitted data.
Therefore, before closing the external cover, use the red dip switch on the I/O board to set the
specific serial address of each device.
All devices are supplied with the address set to "1" as a factory
setting, and therefore set up for use as a single unit. If used in a
serial connection, a different address must be set for each connected
inverter.
To set the serial address, lift the white lever of the dip switch
corresponding to the number to be assigned, and lower all the other
levers. For example, to set address "2", set the dip switch as shown
in the figure below:
The serial address value set via the dip switch on the I/O board must subsequently be entered in the
software of each device on initial activation.

12
INTRODUCTION TO PROGRAMMING:
KEY DESCRIPTION
Left-hand arrow: this scrolls back through the menu pages
Right-hand arrow: this scrolls forwards through the menu pages
On-Off/Reset: this switches the device from stand-by to operation mode and
resets the unit in the event of alarms and/or faults.
“+” key: this increases the value of the parameter currently shown on the display;
“+” key: this decreases the value of the parameter currently shown on the display;
“AUTOSET”: this starts the self-setting procedure for the stop frequency function
INITIAL CONFIGURATION FOR SINGLE DEVICE INSTALLATION
In the case of single installations, power up the device and follow the instructions for initial configuration as described below.
On initial activation, a welcome screen is displayed and when any key is pressed, a guided configuration procedure is started up,
enabling the entry of the main parameters required for standard operation.
Modify the value of parameters using the keys + and –then confirm the entry by pressing the central
key to move to the next parameter. The parameters to be configured are displayed in the following order:
Parameter 2.0 –Serial address: in the case of single installations with a single pump, leave this value
at 1. If a pressurisation unit with multiple pumps is installed, set the number of the device in the serial
bus from 1 to 8. The value must correspond to the setting of the dip switch on the I/O board, as explained
in the previous paragraph. Each device must have a different serial address number to be distinguished
from the others.
Parameter 2.1 –Pressure sensor serial address: in the case of single installations with a single pump,
leave this value at 1. If a pressurisation unit with multiple pumps is installed, set the number of the
device to which the pressure sensor and any other auxiliary inputs are connected.
The value must be the same for all devices as only one pressure sensor transmits the signal to all
inverters.
Parameter 1.0 –Motor current: set the rated motor current as stated on the pump electrical data plate.
In the case of multiple installations with several pumps, the value must be set for each inverter, as the
pumps may have different characteristics.
Parameter 0.0 –Pressure set point : set the constant pressure value that the inverter must maintain in
the system. The pump rotation regime is varied according to the flow rate demand of the system, to
maintain pressure at the set value.
Parameter 0.1 –Pump start-up DeltaP: set the value of the negative Delta with respect to the set point
pressure for pump start-up. For example, if the set point is 2.5 and the DeltaP is 0.3 bar, the pump starts
up at values below 2.2 bar.
Parameter 0.2 –Dry running pressure: set a minimum pressure value, below which the dry running
protection device trips due to lack of water. In the case of pump operation at maximum speed, if the
pressure in the system falls below this value, the inverter shuts down the motor after a set delay interval.
To ensure correct operation of this protection device, the settable value must never be higher than the set start-up pressure (obtained
from the difference between the set point and the DeltaP values described above). Operation of the protection device should be tested
after installation. Also take into account the water column on outlet, if present.
Welcome
push any key
2.0 Serial
Address 1
1.0 Motor rated
current 0.5A
0.0 Pressure
setpoint 3.0 BAR
0.1 DeltaP
startpump 1.0
BAR
0.2 Dry running
press 0.5 BAR
2.1 Press.sensor
ser.address 1

13
At the end of the configuration procedure the display shows the main operation screen. The device is set
to standby, and therefore with the motor stopped.
Press the central key to exit standby status and start the pump.
CONFIGURATION FOR MULTIPLE INSTALLATIONS
In the case of installation with multiple pumps, great care must be taken on initial start-up, to ensure that the addresses of all devices are
set correctly and to avoid serial communication errors.
The initial configuration procedure is shared among devices only for the common parameters (e.g. operating pressures), while the
independent parameters (such as the serial address and maximum motor current) are set individually on each device.
On activation, when the welcome screen is displayed; press the central key on all connected devices and then proceed with setting
the serial addresses, taking care to ensure that the set value corresponds to the value set via the dip switch on the I/O board (each
inverter must have a different address).
Confirm entry of the serial address on all devices by pressing the central key on each inverter.
On each Nettuno, set the motor current absorption value and confirm the value by pressing the central key on each device.
WAIT A FEW SECONDS UNTIL ONE OF THE DEVICES IS SET AS MASTER (illumination of blue light) then continue
setting the parameters exclusively via the keypad of the MASTER device; the set values will be shared and transmitted
automatically to the other connected inverters
REGULATION OF STOP FREQUENCY (AUTOSET FUNCTION)
After setting up the system for normal conditions of use (pump fully primed, no air present, correct direction of rotation), if the pump
does not stop automatically on closure of the utilities, the autoset function may be started up to automatically calculate the stop
frequency value.
To start the autoset procedure:
1) switch the inverter to standby by pressing the central key
2) open one of the valves to completely discharge all pressure from the system
3) press and hold the “Autoset” key for 5 seconds
4) close each valve on delivery and press the central key to start the autoset function
5) wait until the device starts the motor and attempts to calculate the correct value of the stop
frequency on the basis of the characteristics of the pump and the set operating pressure
6) if the outcome is positive, the confirmation screen is displayed. Press the central key again to return
to the main operation screen
7) if the autoset procedure fails, when the device is unable to determine the correct stop frequency, the
relative error screen is displayed. Attempt to repeat the procedure after verifying correct operation
of the pump and correct entry of the set point value. If the outcome is still unsuccessful, adjust the
parameters "Minimum frequency" and "Stop frequency” manually as explained in the next section.
0.0 BAR 0 Hz
Stand-by
2.5 BAR 40Hz
Running
2.5 BAR 0 Hz
Stand-by
AUTOSET Close
delivery
AUTOSET pending
0.0BAR 30 Hz
AUTOSET Complete
Correctly!
AUTOSET not
Completed-Error

14
MAIN MENU STRUCTURE
The main menu shows the operational values of the system: pressure, current frequency of the motor, input voltage, output current of the
motor and internal temperature of the inverter. It is also possible to select the language.
DESCRIPTION OF THE PARAMETERS AND SCREEN PAGES
MAIN MENU:
These screen pages are accessible when the device is on. To change pages, press the right and left keys as required.
Main screen page: when Nettuno is operating correctly, the first line of the display shows the
instantaneous pressure detected by the system and the current frequency of the motor. The lower line of
the display shows the current status of the inverter (Operation/Stand-by/Slave). From here, it is possible
to scroll through the main menu using the arrows, or put the system in "Stand-by" by pressing the central
"on-off" key. In the case of multiple installation with several pumps, simply adjust the master device to switch all connected inverters to
stand-by status.
When Nettuno is in stand-by, the pump will not start up even if the pressure drops below the value set.
To quit stand-by, press the central key again.
Voltage and temperature screen: this menu screen enables the user to view the voltage on inverter
input and the internal ambient and IGBT power module temperatures. The values of these temperatures
contribute to the intelligent power management, which limits the value of the maximum frequency of the
motor when the pre-alarm thresholds are reached.
Currents screen: this screen displays the phase currents of the motor. The value of the output current to
the motor may differ from the value of the input current as the inverter modulates both frequency and
voltage.
Language:The language used for the menus and the alarm messages can be selected by the user. Use
keys + and –to modify the parameter value.
INSTALLER PARAMETERS:
These parameters are present in hidden screens and normally should only be modified during the installation and set-up phases.
To access these pages switch the device to Stand-by and keep the “+” and “-“ keys pressed together
for 5 seconds. On entry to the hidden menu, use the“<<” and “>>” keys to scroll the pages and the
“+” and “-“ keys to change the parameters. To return to the main page press the central key.
The parameters are divided into 4 groups:
-group 0 : pressure parameters
-group 1 : motor parameters
-group 2 : multiple operation parameters
-group 3 : input/output parameters
-group 4 : times
2.5 BAR 0 Hz
Stand-by
Vin = 380V
Tm=24°C Ta=30°C
U(A) V(A) W(A)
0.0 0.00.0
Language
English
2.5 BAR 40 Hz
Running
2.5 BAR 0 Hz
Stand-by
Vin = 380V
Tm=24°C Ta=30°C
U(A) V(A) W(A)
0.0 0.0 0.0
Language
English
2.5 BAR 0 Hz
Stand-by

15
GROUP 0 - PRESSURE PARAMETERS
0.0 –Pressure set point: this parameter enables entry of the device set point. It is a constant pressure
value required by the system (maximum pressure). During its operation, Nettuno adjusts the electric
pump revs to adapt them to the actual demand from the utilities, therefore maintaining a constant system
pressure.The set value must be below the maximum delivery pressure of the pump, to ensure specific
modulation of the pump itself and consequent energy savings.
0.1 - Pump start-up Delta P: this parameter sets the the negative pressure delta compared to the pump
start-up set point. On opening of any type of utility, the pump will not start-up until the system pressure
has fallen below the set point by a value equal to the delta set in this parameter. After the motor is started
up, the rotation speed is controlled to maintain the pressure value as close as possible to that set in the
pressure set point parameter. The minimum differential settable between Pmax and Pmin is 0.3 Bar, with the recommended value being
at least 0.5 Bar.
0.2 –Dry running pressure: set a minimum pressure value, below which the dry running protection
device trips due to lack of water. In the case of pump operation at maximum speed, if the pressure in the
system falls below this value, the inverter stops the motor. To ensure correct operation of the protection
device, the settable value must never be higher than the set start-up pressure (obtained from the
difference between the set point and the deltaP values described above). Operation of the protection device should be tested after
installation. Also take into account the water column on outlet, if present.
0.3 - Limit pressure: this parameter sets the limit for the over-pressure protection to intervene.
Tripping of the over-pressure protection stops operation of the inverter until it is reset by the user.
0.4 –Pressure 2 set point: this parameter enables entry of the secondary set point of the device. When
the I/O board input is closed externally, the pressure value set in this parameter becomes the new set
point , according to which Nettuno regulates the revs of the electric pump (see also parameter 3.1).
0.5 - Immediate stop Delta P: this parameter sets the positive pressure delta compared to the set point
for immediate shutdown of the pump. During normal operation, when the valves close, the pump stops
after a time set in the parameter "stop delay". In any event, if the system pressure exceeds the Pmax
value of a delta greater than the value set in this parameter, the pump will stop immediately to avoid
overpressure which may damage the system.
0.6 - Unit of measurement: select the unit of measurement in BAR or PSI
0.7 –Sensor full scale: this defines the full scale of the connected pressure sensor. It is compatible with
pressure sensors from 0-6 bar up to 0-16 bar or from 0-100 PSI up to 0-250 PSI, with current signal
4÷20mA.
GROUP 1 : MOTOR PARAMETERS
1.0 –Motor current: this parameter enables entry of the maximum current absorbed by the electric
pump in routine conditions, to enable shut-down of the motor in the event of excessive absorption.
Shutdown occurs also if the current is unbalanced between phases by more than 25% with respect to the
set maximum value.
The trip time of the current overload safety device is inversely proportional to the entity of the overload in progress; therefore, a slight
overload will lead to a more delayed trip time while a more significant overload will accelerate the trip time.
1.1 - Direction of rotation: this screen enables the user to invert the direction of rotation of the electric
pump without modification to the electric motor wiring. To modify the direction of rotation of the
motor, use keys "+" and "-"; the direction indicated by the arrow has a purely indicative value and does
not reflect the actual sense of rotation, which must be verified by the installer.
1.2 - Minimum frequency: this parameter defines the minimum frequency at which the pump is started
up and defines the end of the ramp for shutdown. For three-phase pumps a value of 25Hz is advised.
Also consult the information supplied by the manufacturer of the electric pump to determine at what
minimum frequency value the connected electric motor can operate.
0.0 Pressure
setpoint 3.0 BAR
0.1 DeltaP start
pump 1.0 BAR
0.2 Dry Running
Press. 0.5 BAR
0.3 Over press.
Limit 16.0 BAR
0.4 Pressure set
point2 3.0 BAR
0.5 DeltaP stop
immed. 1.5 BAR
0.6 Measurement
unit BAR
0.7 Pres.Sens.
Scale 16.0 BAR
1.0 Motor rated
Current 0.5A
1.1 Motor rotat.
Direct -->
1.2 Minimum
Freq. 25 Hz

16
Stop frequency: this parameter defines the minimum frequency value, below which the motor is
stopped. During regulation, if the set point pressure value is reached and the motor frequency is below
this value, the inverter attempts to stop the pump (the motor frequency is decreased to the value set in
parameter 1.2 Minimum Frequency). If all utilities are closed and the pressure remains constant despite
the reduction in rotation speed, the pump is stopped correctly. If the pump does not stop, try to increase this value. Otherwise, in case of
continuous pump cycling, try to lower the stop frequency value. To enable correct execution of the shutdown ramp, the stop frequency
must be at least 5 Hz above the set minimum frequency in parameter 1.2.
Nominal motor frequency:depending on which motor is running, it is possible to select the maximum
inverter output frequency (50 or 60 Hz). Caution: an incorrect selection of the maximum frequency may
cause damage to the pump; consult the manufacturer's technical data carefully.
Switching frequency: set the frequency of inverter switching. The selectable values are 3, 5 and 10
kHz. Higher switching frequency values may reduce the noise of the inverter and allow a more fluid
regulation of the motor but may cause increased temperatures in the electronic board, an increase in
electromagnetic disturbances and potential damage to the electric motor (especially with long cables).
Low switching frequency values are recommended for medium-large pumps, where there is a long distance between the inverter and
motor or high ambient temperatures.
Frequency correction: this parameter enables entry of a deviation, positive or negative, of the
maximum frequency compared to the set nominal value. It may be useful to set a negative deviation
(down to –5Hz) where a limit to the maximum power of the electric pump is wanted and to avoid
possible overload. A positive increase (up to +5Hz) may instead be necessary when a slightly higher
electric pump performance is required. While no particular precautions exist in lowering the maximum frequency, its increase must be
carefully evaluated after having consulted the manufacturer of the electric pump and taking into consideration the maximum current
supported by the inverter and the electric motor.
GROUP 2 : MULTIPLE OPERATION PARAMETERS
2.0 –Serial address: in the case of single installations with a single pump, leave this value at 1. If a
pressurisation unit with multiple pumps is installed, set the number of the device in the serial bus from 1
to 8. The value must correspond to the setting of the dip switch on the I/O board, as explained in the
paragraph on electrical connections. Each device must have a different serial address number to be
separate from the others.
2.1 –Pressure sensor serial address: in the case of single installations with a single pump, leave this
value at 1. If a pressurisation unit with multiple pumps is installed, set the number of the device to
which the pressure sensor and any other auxiliary inputs are connected.
The value must be the same for all devices to ensure that only one pressure sensor transmits the signal to
all inverters.
2.2 –Auxiliary pump: Nettuno can be connected to an auxiliary pump at fixed speed via one of the
relays on the I/O board. The auxiliary pump is started up when the maximum frequency is reached and
the pressure is below the set point. To enable the auxiliary pump function, proceed as follows:
- deactivate multiple operation by setting parameter 2.5 to OFF
- set parameters 3.4 or 3.5 to “AUX” to associate the auxiliary pump function with one
of the output relays.
2.3 –Partner activation delay: this defines the delay before Nettuno activates the auxiliary pump or
requests intervention of a partner inverter when the maximum frequency is reached. Increase this delay
interval if too many consecutive start-ups occur at close intervals of the auxiliary pump or partner
inverters in the case of high speed pressure transients in the system. Reduce the parameter to increase
the speed of intervention of the partner device or pilot pump on increase of water demand.
2.4 –Timed master changeover: when using pressurisation units with multiple pumps, it is possible to
implement timed master changeover, where, together with pump shutdown, the master is also changed
over every 60 minutes of continuous operation. In this way, in systems where collection is continuous
and the stop condition for all pumps is never reached, the correct changeover of master devices is still
guaranteed.
2.5 - Multiple mode activation: set this parameter to OFF to disable Nettuno for multiple mode
operation with several inverters. In this case the device, though powered, is not involved in multiple
mode operation and therefore does not become a master device or intervene as a partner device.
However, if no master is present for 15 seconds, the device starts operating as a new master and takes
control of the system. This function can be used if, on systems with multiple pumps, the user wishes to
assign one as a reserve pump, activated only in the event of a fault of all other inverters. This parameter should be set to OFF also if the
user wishes to use the auxiliary pump function via one of the relays of the I/O board, as this function is not compatible with multiple
mode function.
1.3 Stop motor
freq. 31 Hz
1.4 Motor rated
freq. 50 Hz
1.5 Switching
freq. 5 KHz
1.6 Frequency
corr. 0 Hz
2.1Press. Sensor
ser.address 1
2.0 Serial
Address 1
2.2 Auxiliary
pump OFF
2.3 Partner act.
delay 2.0 sec
2.4 Timed master
Swapping OFF
2.5 Booster
mode funct. ON

17
2.6 - Reduced threshold value: when a partner device is set in operation to assist the master device in
maintaining the set point pressure, the activation frequency is initially reduced to the set value (as a
percentage of the nominal value) in this parameter. In this way, both the partner and master devices can
operate in a balanced way, close to the maximum output point of the pump. When intervention of the
partner device at the reduced threshold value is not sufficient to guarantee the set pressure value, the partner device is then set to operate
at the maximum nominal frequency.
GROUP 3 : INPUT/OUTPUT PARAMETERS
3.0 - Motor control source: this parameter defines the control source for calculating the motor
frequency. These options are available:
PRES (pressure): operation proceeds on the basis of the pressure read by the sensor
4-20mA
MAN (manual): the motor is started up via the keypad of Nettuno and the speed can be adjusted using
the keys “+” and “-“.
0-10V (analogue input): regulation is based on the signal from the analogue input of the I/O board.
The frequency is calculated considering that 0V corresponds to 0Hz and 10V corresponds to the
maximum motor frequency. When the value calculated by the analogue sensor is below the stop
frequency (parameter 1.3), the pump is stopped.
3.1 - Input of set point 2: enables the input for the secondary set point. This contact can be set to NO
or NC mode. When this input is switched, the active pressure set point for regulation becomes parameter
0.4.
3.2 - Permissive input: sets the input for an external permissive. This contact can be set to NO or NC
mode. The pump is only started when the input is in the correct status.
3.3 - Error input: sets the input for an external error. This contact can be set to NO or NC mode. The
pump is stopped and an error message appears on display when the input changes status. This can be
used for connection of an external float, or flooding sensor.
3.4 - Relay 1 function: defines the function associated with the output relay 1. The admissible settings
are:
OFF: relay disabled
AL: alarm output; the relay is switched in the event of an error
P.ON: pump ON, the relay is switched when the pump is running
AUX: auxiliary pump; the relay is used for control of an auxiliary pump
3.5 - Relay 2 function: defines the function associated with the output relay 2. The settings are identical
to those described for parameter 3.4
2.6 Reduced
freq. Value 80%
3.0 Command
Source PRES
3.1 Set-point 2
input OFF
3.2 Ext.Enable
input OFF
3.3 Ext. error
Input OFF
3.4 Function
of relay 1 OFF
3.5 Function
of relay 2 OFF

18
GROUP 4 : TIMES
4.0 –Pump stop delay: defines the delay before stopping the pump when the pressure is the same as
the set point and the frequency is below the stop frequency.
4.1 –Automatic reset time: if a temporary absence of water on intake is detected during operation of
the electric pump, Nettuno will shut off power to the motor to avoid it being damaged. On this screen it
is possible to set how many minutes the device will remain stopped before carrying out an automatic
restart to check for the availability of water on intake. If the attempt is successful, Nettuno will
automatically exit from the error condition and the system resumes normal operation; if this is not the case, another attempt will be
carried out after the same time interval. The maximum settable interval is 240 minutes (recommended value is 30 min).
Automatic reset test no.: this parameter sets the number of attempts that Nettuno will perform to
resolve a stop condition due to dry running. Once this limit has been exceeded, the system shuts down
and the user’s intervention is required. If this value is set to zero, the auto-reset function is switched off.
The maximum number of attempts allowed is 20.
Total automatic reset: when set to ON, the automatic reset function is active for any error, in addition
to dry-running, detected by the system. Caution: the automatic and uncontrolled reset of some errors (for
example, overload) could over time cause damage to the system and to Nettuno. Always take great care
when using this function.
ADVANCED PARAMETERS:
The advanced parameters are accessible only to the technical assistance service. For access to these parameters, it is necessary to contact
the re-seller, a technical assistance centre or the manufacturer.
The following table lists the advanced parameters for reference when technical assistance is required.
REF.
PARAMETER
DESCRIPTION
DEFAULT SETTING
7.0
Vboost
Voltage boost at 0Hz
5%
7.1
Dry run delay
Time delay before activation of the protection due to lack
of water
30
7.2
Max. start-ups per
hour
Activation or deactivation of the control on the number of
start-ups per hour (leak checks)
OFF
7.3
Anti-seizure
protection
Activation or deactivation of the control that enables start-
up of the pump after 24 hours of downtime.
OFF
7.4
Dead time
Dead time PWM setting
20*125ns
7.5
Int. constant (Ki)
PID controller integrative constant
10
7.6
Prop. constant (Kp)
PID controller proportional constant
15
8.0
Last error recorded
Last error occurred log
0
8.1
Power supply timer
Inverter power supply time
0
8.2
Motor timer
Electric pump operation time
0
8.3
Motor start-ups
Pump start-up counter
0
8.4
Rel. Software
Release of software
/
9.0
Max. amb. temp.
Maximum ambient temperature
80
9.1
Max. mod. temp.
IGBT module maximum temperature
85
9.2
Reduction index on
At
Frequency reduction index on ambient temperature
1
9.3
Reduction index on
Mt
Frequency reduction index on module temperature
1
9.4
Fan stop delay
Fan shutdown delay after pump stop
10
9.6
Vin min.
Minimum power supply voltage threshold
9.7
Vin max
Maximum power supply voltage threshold
9.9
Variable debug
Debug variable selection for process value display
0
4.0 Pump stop
delay 4.0 sec.
4.1Autom. Reset
Time 30 min
4.2 Autom.
reset tests 5
4.3 Reset all
Errors OFF

19
ALARMS
In the event of system anomalies or malfunctions, one of the following screens will appear on Nettuno display. Each error is coded with
the letter "E" followed by a number from 0 to 13. The number which appears in brackets represents the number of recurrences of each
error. To reset an alarm, after having resolved the cause, it usually sufficient to press the central "reset" key or interrupt the electrical
power supply for a few seconds.
E0 –Low voltage: indicates that the power supply voltage is too low. Check the input voltage value
E1 –High voltage: indicates that the power supply voltage is too high. Check the input voltage value
E2 - Short Circuit: This message will appear on the screen when a short circuit is detected on inverter
output; this may occur following incorrect connections of the electric motor, damage to the electrical
insulation in the wires connecting the electric pump to the device or a fault in the pump's electric motor.
When this error appears, the electrical system should be checked as soon as possible by skilled
personnel. The error may only be removed by disconnecting the equipment from the electrical power source and resolving the cause of
the fault. Attempting to restart the inverter in the presence of a short-circuit in output may cause serious damage to the equipment and be
a source of danger to the user.
E3 - Dry running: this message appears when the system is stopped following a pump intake water
shortage. If the auto-reset function has been enabled, Nettuno will carry out automatic attempts to check
for the availability of water. To clear the error status, press the central “reset” key.
E4 –Ambient temperature:the error appears if the maximum internal ambient temperature of the
inverter is exceeded.Check the conditions of operation of the inverter.
E5-IGBT module over temperature: the error appears if the maximum temperature of the IGBT
module of the inverter is exceeded. Check operating conditions of the inverter, and in particular the
cleanliness of the forced air ventilation system, the current absorption of the pump and the ambient
temperature. If necessary, attempt to reduce the switching frequency.
E6-Overload: this alarm is displayed when electric pump absorption exceeds the maximum set current
as entered in the Imax value: this may occur following intensive use of the electric pump, continuous
restarts at close intervals, problems with the motor windings, or following problems with the electrical
connection between the motor and Nettuno. If this alarm trips frequently, arrange for the system to be
checked by the installer.
E7 –Load not balanced: this alarm may occur if the phase currents of the motor are unbalanced by
more than 25 % of the nominal value.
E8-serial error: this alarm may occur where there is an internal serial communication on Nettuno.
Contact the technical assistance.
E9-Pressure limit: the alarm intervenes when the maximum set pressure threshold has been exceeded.
If the error appears repeatedly, check the setting of the "P limit" parameter. Also check other conditions
which may have caused an overpressure (for example, partial freezing of the fluid).
E10-External error: this alarm will be displayed if, after setting the external error function on the
auxiliary I/O board, the I/O input contact is closed.
E11-Number of maximum starts/hour: this error appears if the maximum number of admissible start-
ups per hour has been exceeded. Check for the presence of any leaks in the system. Check pre-loading
of the expansion tank.
E0 Input voltage
Low ( 0)
E1 Input voltage
high ( 0)
E2 Output Short
circuit ( 0)
E3 Pump dry
Running ( 0)
E4 Ambient over
temp. ( 0)
E5 Module over
Temp ( 0)
E6 Motor over
Load ( 0)
E7 Unbalanced
Load ( 0)
E8 Internal ser.
Error ( 0)
E9 Over pressure
Error ( 0)
E10 External
error ( 0)
E11 Max.starting
hour ( 0)

20
E12- Error 12V: an anomaly has been detected in the internal low voltage power supply circuit. Have
the manufacturer check the device.
E13-Pressure sensor error: the pressure sensor has detected an incorrect value. Check or replace the
pressure sensor.
POSSIBLE MALFUNCTIONS:
The pump does not stop
The stop frequency is too low; increase this value or run the self adjusting procedure.
The expansion tank does not have the correct pre-load value; check.
When one of the cocks in the system is opened, the pump does not start, or there is a few seconds delay before it starts
The set “pump start-up DeltaP” is too high. Try to reduce the DeltaP value.
Ensure that the system is not set to standby; press the central key if necessary.
Check correct operation of the external permissive contact (if configured).
When the water flow is extremely low, the pump does not operate normally
The stop frequency is too high; try to lower the value to ensure more uniform operation also at low flow rates.
When the cocks are closed, the pump stops but restarts a few seconds later and there is no leakage from the system
The “pump start-up DeltaP” value is too low; increase.
The expansion tank does not have the correct pre-load value; check.
The device often signals 'dry running'
The pump intake pipe drains when the system is not used for some time, thereby preventing it priming the next time it is started. If there
is a foot valve fitted, check its seal.
The dry running protection pressure value has not been set correctly; correct the value.
The device often signals 'high or low voltage'
The power supply voltage may not comply with the device specifications; have it checked by qualified personnel.
The device overheats and the over-temperature protection intervenes
The forced air cooling system on the heatsink fins may be blocked; check correct operation and condition (cleanliness).
The switching frequency is too high for the power of the pump used; reduce the value.
The ambient temperature is too high for use of this device.
The pump turns at maximum speed but with poor performance
The connection of the pump is incorrect; check the electrical wiring.
The pump turns in the opposite direction; check the direction of rotation.
When more water is required by the system, the pressure drops
This is a normal condition which is due to the fact that the device is unable to force the pump beyond its capacity curve. As a result, once
a certain flow rate is exceeded, the pressure is no longer offset as the pump is already running at the highest number of revolutions
allowed. In these cases, a pump with higher performance levels should be installed.
The pressure signal is not correct or the devices are not communicating correctly, or multiple masters are present at the same
time.
Some inverters connected on the serial bus may have the same address; check settings of the parameter "serial address" and settings of
the dip switch on the I/O board for each device.
Check the serial connection between the devices.
E12 12V supply
Error ( 0)
E13 Press.sensor
error ( 0)