Nastec NERA Series User manual

NERA solar submersible pumps
Installation and Operating Manual

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Index
1. Introduction to the NERA solar submersible pumps range .......................................................................................... 3
2. Safety Instructions ........................................................................................................................................................3
3. Stocking conditions ....................................................................................................................................................... 3
4. Packing content............................................................................................................................................................. 4
5. General technical features............................................................................................................................................ 4
6. Pump installation .......................................................................................................................................................... 4
6.1 Installing pump in the well.....................................................................................................................................5
6.2 Installing the pump in a solar pumping system ......................................................................................................5
6.3 Pump cable............................................................................................................................................................. 6
6.4 Water level sensing................................................................................................................................................. 7
7. Troubleshooting............................................................................................................................................................8

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1. Introduction to the NERA solar submersible pumps range
NERA are a 4” submersible solar pumps for clean water composed by:
three phase permanent magnet motor with wet rotor and canned type resin filled stator.
Stator on-board inverter.
Multi stage pump entirely made of AISI 304 stainless steel (centrifugal models)
Helical rotor pump (helical rotor model)
NERA pumps are fed by DC voltage with wide margins of operating voltage (70-190 VDC).
In the application with photovoltaic panels, the MPPT algorithm maximizes, for various conditions of irradiation and
temperature, the electric power obtained from the panels thus the amount of water extracted.
Pump speed is adjusted in relation to solar irradiation. When solar irradiation increases, pump will run faster thus
pumping more water. When solar irradiation decreases (clouds moving or different hours of the day) pump will
reduce its frequency and so delivery but it continues pumping till solar irradiation reaches the minimum value
necessary for working.
2. Safety Instructions
The manufacturer strongly suggests to reading carefully this operation manual before using and installing its
products
Any operation (installation, maintenance and repair) must be carried out by trained, skilled and qualified personnel.
Failure to observe and follow the instruction of this manual may result fatal in dangerous electric shock.
The unit must be connected to the power supply by a switch granting the
complete visual disconnection (separation) from the line before any operation.
Disconnect the unit from the power supply before any operation.
NERA and pump system must be grounded properly before any operation.
Do not start the pump for any reason if not completely immersed in water.
Avoid any shock or serious impact during transportation.
Damages due to transportation, incorrect installation, or improper use of the device will null and void the warranty.
The manufacturer cannot be held responsible for any damage to people and/or property due to improper use of
its products.
3. Stocking conditions
Store the product on its packaging in a dry and well ventilated environment within a temperature range from -20 ° C
to 50 ° C.
If the pump remains in stock for more than a year is recommended to disassemble the rotating parts and test their
functionality. It 'also need to power the electric pump (without running the motor) to allow charging of electrolytic
capacitors of the inverter module.
If the pump has already been put into operation and is then placed in storage, the minimum storage temperature is
4 ° C. Alternatively you need to add anti-freeze fluid.

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4. Packing content
Packing includes:
NERA submersible pump with 2,5 meters flat cable length.
Cable junction kit.
Operating Manual.
5. General technical features
NERA PUMP
Max. temperature of pumped liquid
35 °C (92 °F)
Min. speed of water flow on motor case
0.2 m/s
Characteristics of pumped liquid
clean, non-corrosive, non-explosive, free of particles and
fibers, with a maximum sand content of 50 g/m3
Grade of protection
IP68
Used Materials
Pump and motor body in AISI 304
Cable
Flat cable ACS –KTM - WRAS approved
Supply Voltage
70 –190 VDC
Max input power
800 W
CERTIFICATIONS
CE
6. Pump installation
Entire installation procedure must be performed verifying that pump is not connected to
the power supply.
Pump can be installed both vertically and horizontally,
but the outlet should never be below the horizontal
line. Minimum head of 10% than max pump head
must be granted.
If the pump is not installed in a well, to grant a proper
cooling, a cooling sleeve must be used; doing so the
minimum speed of the pumped liquid has to be
granted.
Check the packing immediately upon delivery and check for damage and/or missing parts;
in either cases immediately notify the supplier.

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6.1 Installing pump in the well
To reduce noise transmission it is advised to use plastic pipes.
The pump must always be secured in the well through a special rope attached to loop on the pump head.
It is recommended not to drop the pump in the well by using the electric cable, its integrity must be preserved in all
operations. In this regard it is recommended to fix the cable on cable support or on the pipe.
During operation the pump suction must always remains at least 1.5 meters below the dynamic water level.
Do not drop the pump in the well by using the electric cable
Make sure about the electric cable integrity during all the operations.
Ensure the pump in the well with a stainless steel rope to be fixed to the
hole in the pump head
6.2 Installing the pump in a solar pumping system
All protections of overload, overvoltage and dry running protection are integrated into the on board inverter.
It is recommended anyway to install the DC switch to start and stop the pump and to ensure a proper disconnection
between the pump and panels during maintenance.

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6.3 Pump cable
NERA pumps are equipped, in their standard configuration, with 2,5 meter flat cable length.
It is necessary to respect polarity !
Not respecting the polarity causes irreparable pump failure
If the distance between the pump and the power supply is longer than the supplied cable it is necessary to make a
junction performed by the special kit supplied as standard.
The cable section for additional power conductors must be calculated considering the maximum allowed power loss.
           
󰇟󰇠

S: wire section [mm^2]
: specific resistance = 0,018 [Ω mm^2/m]
L: cable length [m]
P1: pump electrical power [W].
V: voltage at maximum power.
∆P: allowed power loss [%]. It is recommended not to exceed 3%.

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6.4 Water level sensing
To make the junction is necessary to follow carefully the instructions inside the kit.
At the time of joining and electrical connection is essential to maintain the
correspondence between the cables.
After cable joining and placed the pump in the well you must perform, before
connecting to power supply, a test of insulation: join together the two power cables
and, applying a voltage of 500V, an insulation resistance from the ground higher than
100 Mohm must be verified. Join together the two signal cables and, applying a voltage
of 500V, an insulation resistance from the ground higher than 100 Mohm must be
verified.
WATER LEVEL SENSOR
Water level sensing is based on
variation of measured
impedance. Keep it clean and
not in direct contact with pipes
in order to grant its function.

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7. Troubleshooting
If the pump, after the installation and power supply connection, doesn’ t provide any water please verify:
correct wiring.
voltage conditions (70 –190 VDC).
enough power available (solar irradiance).
water presence: if pump during operation runs dry, an alarm occurs and pump will stop. Every 5 minutes
pump will attempt to restart the operation after 5 minutes.

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DECLARATION OF CONFORMITY
In according with:
Machine Directive 2006/42/EC
EMC Directive 2004/108/CE
Low Voltage Directive 2006/95/EC
We Nastec srl, Via della Tecnica, 8, 36024, Mossano, Vicenza, Italy, declare that NERA solar pumps conform to the
following regulations:
EN 55011 Class A
EN 60335-1, EN60335-2-41
Ing. Marco Nassuato
Operation Manager

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NOTE
Copyright NASTEC srl
Nastec reserves the right to modify informations in this manual without any notice.
Nastec srl, Via della Tecnica, 8, 36024, Mossano, Vicenza, Italy, Tel. [phone], Fax [phone], www.nastec.eu,
[email protected]
Watertorque Group
Address: Lot 1 Brand Highway Muchea WA 6501
Phone: [phone]
Email: [email protected]