Une ZHERO User manual

v.1.4.2 23/06/2021
UNE SRL
-
VIA MODENA 48/E
–
42015 CORREGGIO (RE)
-
ITALY
-
VAT No. 02513460358
-
T.+39 0522 693566 - F. [phone] - [e-mail] – www.unesrl.com

1
Summary
1. INFORMATION ABOUT THIS DOCUMENT ................................................................................................................. 4
1.1. Scope .................................................................................................................................................................. 4
1.2. Warranty and supply conditions ......................................................................................................................... 4
1.3. Symbols used ..................................................................................................................................................... 5
1.4. Symbols affixed to the frame of UNE ZHERO ..................................................................................................... 6
1.5. Glossary and definitions ..................................................................................................................................... 7
1.6. Recipient qualifications ...................................................................................................................................... 9
2. CONDITIONS OF USE ............................................................................................................................................... 11
2.1. Limitations on use ............................................................................................................................................ 11
3. UNE ZHERO CHARACTERISTICS ............................................................................................................................. 13
3.1. Overview ........................................................................................................................................................... 13
3.2. Wiring Diagram ................................................................................................................................................. 15
3.3. Technical data .................................................................................................................................................. 15
3.4. UNE ZHERO nameplate ..................................................................................................................................... 15
4. SAFETY WARNINGS ................................................................................................................................................. 16
4.1. General information .......................................................................................................................................... 16
4.2. Personal protection .......................................................................................................................................... 18
4.3. System .............................................................................................................................................................. 19
4.4. Residual risks .................................................................................................................................................... 20
4.5. Hazard reporting ............................................................................................................................................... 20
5. INSTALLATION ........................................................................................................................................................ 21
5.1. Lifting and transport ......................................................................................................................................... 21
5.2. Tools required for installation ........................................................................................................................... 23
5.3. Environmental and general installation conditions ........................................................................................... 24
5.4. UNE ZHERO Positioning.................................................................................................................................... 25
5.5. Unpacking ......................................................................................................................................................... 26
5.6. Preliminary operations before proceeding to electrical connection ................................................................. 27
5.7. General connection diagram of the machine .................................................................................................... 32
5.8. Internal overview and overview of the ZHERO panel ........................................................................................ 33
5.9. Connection description ..................................................................................................................................... 35
5.9.1. UNE ZHERO connection to the photovoltaic generator ............................................................................. 35
5.9.2. Installing or changing the batteries ........................................................................................................... 37
5.9.3. UNE ZHERO - AC Connection to the Distributor grid/Genset – “Backup” .................................................. 40
5.9.4. Connecting the production meter .............................................................................................................. 43
5.9.5. Wattmeter connection (mandatory On-grid) and USER ............................................................................. 45
5.9.6. Internet connection.................................................................................................................................... 52

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6. STARTING THE MACHINE ....................................................................................................................................... 54
6.1. Turning the system on ...................................................................................................................................... 54
6.2. Checking the correct operation of the system .................................................................................................. 56
6.2.1. UneSrlCommunication ............................................................................................................................... 57
7. SYSTEM OPERATION ............................................................................................................................................... 60
7.1. Recommendations for optimal standard use ................................................................................................... 60
7.2. Monitoring......................................................................................................................................................... 62
7.2.1. Webserver .................................................................................................................................................. 62
7.2.2. Webapp...................................................................................................................................................... 71
7.3. UNE ZHERO functions....................................................................................................................................... 82
7.3.1. “Standard” function ................................................................................................................................... 82
7.3.2. "Cyclic load" function ................................................................................................................................. 82
7.3.3. "Charge hysteresis" function ..................................................................................................................... 82
7.3.4. Photovoltaic energy management............................................................................................................. 83
7.3.5. Blackout ..................................................................................................................................................... 83
7.3.6. Power ramp ............................................................................................................................................... 83
7.3.7. Warmup, battery charging and discharging ............................................................................................... 84
7.3.8. System in stand-by .................................................................................................................................... 84
7.3.9. Funzionamento Off-grid ............................................................................................................................. 85
7.4. Security checks ................................................................................................................................................. 86
7.4.1. Insulation test ............................................................................................................................................ 86
7.4.2. Differential circuit breaker of the machine ................................................................................................ 87
8. WHAT TO DO IN THE EVENT OF A FAILURE OR ERROR .......................................................................................... 88
8.1. Low insulation resistance ................................................................................................................................. 88
8.2. String error ........................................................................................................................................................ 89
8.3. Battery error ...................................................................................................................................................... 89
8.4. Controller error .................................................................................................................................................. 90
8.5. Inverter error ..................................................................................................................................................... 90
8.6. Ethernet communication error .......................................................................................................................... 91
8.7. System bypass ................................................................................................................................................. 92
8.8. Breakdown of differential magnetothermic on board-machine ........................................................................ 92
8.9. Failure to connect to the distributor / generator network ................................................................................. 93
9. TECHNICAL SUPPORT ............................................................................................................................................. 94
10. MAINTENANCE AND UPDATE .............................................................................................................................. 96
10.1. Batteries maintenance .................................................................................................................................. 97
10.2. Controller maintenance ................................................................................................................................. 99
10.4. System update ............................................................................................................................................ 101
11. DISPOSAL ........................................................................................................................................................... 103

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12. ANNEXES............................................................................................................................................................ 104
System alarm and error table .................................................................................................................................... 104
MANUALS ATTACHED TO UNE ZHERO ........................................................................................................................ 105

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1. INFORMATION ABOUT THIS DOCUMENT
Installer Maintenance
technician
User
This manual contains important safety instructions that must be followed when using UNE ZHERO.
The original language of this document is Italian; in case of inconsistencies or doubts, please request the original
document from UNE srl.
These instructions for use are intended for all UNE ZHERO installers, maintenance technicians and users, with the
purpose of providing guidance for the correct use of the system in order to render it as efficient as possible.
These instructions are an integral part of UNE ZHERO; the product cannot be supplied without this document since
it must be available at all times to those who use the equipment.
Please keep in mind that UNE ZHERO can be used only by those who have read and understood this manual in its
entirety; if in doubt, please contact your supplier for clarification.
UNE srl shall not be liable for any damage to persons and/or property as a result of operations carried out on the
system in a manner other than that indicated in this manual.
For information on how to install UNE ZHERO, please refer to the instructions supplied with the equipment.
1.1. Scope
Installer Maintenance
technician
User
These instructions for the installation, maintenance and use of UNE ZHERO apply to all firmware versions.
You can find the firmware version of your device in your dedicated section on www.unesrl.com or in the info
section of the webapp installed on your smartphone/tablet.
This product can be used only within its intended scope, i.e. only in residential, commercial and light industrial
applications, in 230V (single-phase) 50 Hz TT and TN-S (electricity distribution networks).
For further information and questions, please contact UNE srl via the channels indicated in the contact
section.
1.2. Warranty and supply conditions
Installer Maintenance
technician
User
The warranty conditions can be found in a dedicated document supplied with the equipment; in particular, the
warranty conditions are valid only if:
 The installer and the maintenance technician respect the instructions in this manual;
 NO unauthorised operations or operations that are inconsistent with this document are performed on UNE
ZHERO;
 Any “open casing” operations to be performed on UNE ZHERO are carried out only by authorised staff;

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 NO changes are made to UNE ZHERO.
UNE srl shall NOT be held liable for any defect or malfunction resulting from improper use of the equipment;
from transport damage or damage due to particular environmental conditions; from lack of or inadequate
maintenance; from tampering or poor repair work; from installation or maintenance performed by unauthorised
persons.
Also, UNE srl disclaims all liability for damage in the event of failure to comply with the standards for proper
installation in force in the country where the machine is installed.
1.3. Symbols used
Installer Maintenance
technician
User
Thissymbol indicates a danger.
Failure to comply with the information marked with this symbol may result in a fatal
danger and cause damage to the device.
This symbol indicates caution.
Failure to comply with the information marked with this symbol may hinder the correct
execution of the work phases and prevent the optimal operation of the device.
This symbol indicates careful reading.
The recommendations marked with this symbol may facilitate the use of UNE ZHERO
and improve its performance, depending on its place of installation.
This symbol indicates an example.
Here you will find other examples of concrete circumstances.
This symbol marks a chapter intended to be read by the installers of UNE ZHERO.
This symbol marks a chapter intended to be read by the maintenance technicians of
UNE ZHERO.
This symbol marks a chapter intended to be read by the end user of UNE ZHERO.

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1.4. Symbols affixed to the frame of UNE ZHERO
Installer Maintenance
technician
User
This symbol indicates an obligation to read the manual carefully before installing
or starting using UNE ZHERO.
This symbol warns the operator about the presence of electrical hazards inside the
system.
This symbol prohibits the use of water to extinguish fires.
This symbol represents the operating range of the system; for ZHERO it extends
from -10 to + 40 °C.
This symbol indicates a danger of electric shock; before carrying out any other
operation, turn off the device and wait for the indicated time before proceeding.
This symbol indicates the degree of electrical protection of UNE ZHERO.
This symbol warns the operator about the presence of hazards associated with
hot surfaces inside the system.
This symbol indicates that the operator must consult the manual supplied with the
device.
The device contains a toroidal transformer.

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1.5. Glossary and definitions
Installer Maintenance
technician
User
The terms used throughout this document are more or less common; please refer to the definitions below:
Glossary
ELECTRICAL DEVICE
An object that absorbs electricity as part of its normal operation.
BMS
Battery Management System.
DIRECT CURRENT
Type of current produced by the photovoltaic modules, used to power the batteries.
ALTERNATING CURRENT
Type of output current produced by the inverter, that can be used in standard power
grids.
DEALER
Your UNE ZHERO supplier.
FIRMWARE
The firmware is a
program
, a sequence of
instructions
, built directly into an
electronic
component, in the broadest sense of the term (integrated circuits, electronic boards,
peripheral devices). Its purpose is to start the component and enable it to interact with
other hardware components by implementing communication protocols or
programming interfaces.
INSTALLER
The
person who, after appropriate training, has the skills and the ability to work on UNE
ZHERO.
INVERTER
An inverter is an electronic equipment that converts direct current into alternating
current.
RADIATION
In thermodynamics and
electromagnetism, radiation means the transfer of energy
between two bodies by means of electromagnetic waves; e.g. the sunlight that arrives
at the surface of the photovoltaic modules.
LED In electronics, a light-emitting diode (LED) is an optoelectronic device that uses the
optical properties of some semiconductor materials to generate light.
IΔn
Leakage current used by the residual current device
PHOTOVOLTAIC
GENERATOR
An assembly of suitably connected photovoltaic modules that provides energy to your
system.
LOCAL GRID OPERATOR
The local grid operator is the legal entity that manages the electricity distribution
network at the place of reference.
OFFGRID SYSTEM
(STAND-ALONE)
System completely independent of the national power grid, not in parallel with the
power
grid of the local distributor.
GRID-CONNECTED
SYSTEM
Traditional photovoltaic system, in parallel with the power grid of the local distributor.
ROUTINE
MAINTENANCE
System inspection intended to check its condition and restore its original operati
ng
conditions and performance. Routine maintenance is carried out at specific intervals.
EXTRAORDINARY
MAINTENANCE
Work intended to restore the condition of the system following a malfunction or
performance degradation.
PHOTOVOLTAIC MODULE
A photovoltaic module is an
optoelectronic
device consisting of photovoltaic cells, able
to convert the sunlight to which it is exposed into electricity by means of the photovoltaic
effect; photovoltaic modules are usually used as current generators in photovoltaic
systems.
MPPT
MAXIMUM POWER POINT TRACKER is an algorithm that optimises the energy input
from the modules by attempting to adapt the generator to the load by varying the
voltage/current ratio in such a way that the operating point corresponds to the maximum
power point.

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PARALLEL WITH THE
POWER GRID
Condition under which a system can supply the produced energy to the grid of the local
grid operator.
AVAILABLE POWER
The amount of power that the system can
deliver at the same time.
SPD
Surge protection device.
STANDBY
The standby mode is that condition under which electric/electronic devices do not
operate but are ready to switch from the temporary deactivated state to the operating
state.
USER
Subject
who benefits from the services offered by UNE ZHERO.
BACKUP
Function that allows in the event of a blackout by the distributor network to keep one or
more lines in your home powered.
WORKING MODE
UNE ZHERO working mode; depending on its
programming, it can be off
-
grid, on
-
grid
with backup.
PROTECTION INTERFACE
System for disconnecting the photovoltaic system in the event of network anomalies
(SPI or NS protection).
Definitions
EXPANSION
A system is considered expanded when at
least one circuit is added
INSTALLATION
Installation means the construction of a system from scratch or the complete
reconstruction of an existing system.
TRANSFORMATION
An electrical system is considered transformed if subjected to
significant changes,
such as an increase in power.
ROUTINE MAINTENANCE
Routine maintenance encompasses all maintenance operations intended to prevent
excessive wear and tear and address accidental events that can be solved by
performing operations that do not involve changing the structure of the system, in
accordance with the technical standards in force, the user manual and the
maintenance manual provided by the manufacturer.
EXTRAORDINARY
MAINTENANCE
Extraordinary maintenance encompasses all
maintenance operations that do not fall
within installation, transformation, expansion or routine maintenance, such as
replacing a part with another one with different characteristics.
SOLID — MUNICIPAL
WASTE
This category includes all the waste
resulting from human activities such as paper,
rags, plastic, cans, bottles, etc.
SPECIAL WASTE
This category includes all the waste resulting from the processing industry, from
craftwork or agricultural activities that, due to its quantity and quality cannot be
assimilated to municipal waste.
HARMFUL TOXIC WASTE
This category includes all toxic or harmful wastes, which are contaminated.
DISPOSAL
Discarding a product at the end of its life.

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1.6. Recipient qualifications
Installer
Installation, commissioning and maintenance shall be carried out only by qualified staff.
Qualified staff means staff considered fit to work on live electrical systems, in accordance with the standards
in force in the country where the device is installed, (e.g. PEI (authorised person) in the European Community)
and that has received a UNE ZHERO authorised installer certificate form UNE srl.
To receive the authorisation from UNE srl, the staff must attend a special theoretical and practical training
course that ends with an exam intended to demonstrate their skills and knowledge with regard to the structure
of the unit.
Prior to the commissioning of UNE ZHERO, the installer shall provide the user with all the information necessary
for its proper use, including:
 Instructions about the hazards associated with the use of electrical devices
 Instructions on how to use an off-grid system
 Instructions on the safe use of batteries
 Instructions on how to turn off and disconnect the system safely in the event of a failure
 Instructions on how to put the off-grid system in safe mode to prevent its reconnection
 Instructions on how to perform the maintenance and cleaning operations under his/her responsibility
 The requirement to know and observe the instructions for use and all the safety warnings
Maintenance
technician
Maintenance shall be carried out by qualified staff only.
Qualified staff means staff considered fit to work on live electrical systems, in accordance with the standards
in force in the country where the device is installed, (e.g. PEI (authorised person) in the European Community)
and that has received an UNE ZHERO authorised installer certificate form UNE srl.
To receive the authorisation from UNE srl, the staff must attend a special theoretical and practical training
course that ends with an exam intended to demonstrate their skills and knowledge with regard to the structure
of the unit.
Maintenance technicians are required to carry out the intended maintenance operations with due care, in
compliance with the state-of-the-art standards.
Access to UNE ZHERO is prohibited to persons with mitral valves or pacemakers and
to all those under the influence of alcohol or drugs.
The persons working on UNE ZHERO must wear the personal protective equipment
required by the laws in force in the country where the device is installed.