Riello SIRIO HV MT K64 User manual

S
SI IR RI IO O M MT T 6 64 4 ÷ ÷ 8 80 00 0K KW W
CENTRAL INVERTER

pg. 2 / 30 0MNPV364K55ENUG Rev.00
User manual
RPS SpA
via Somalia, 20
20032 Cormano (MI)
www.riello-solartech.it
No reproduction of any part of this manual, even partial, is permitted without the manufacturer’s
authorization. The manufacturer reserves the right to modify the product described herein, in order to
improve it, at any time and without notice.

0MNPV364K55ENUG Rev.00 pg. 3 / 30
Symbols used in the manual
In this manual, some operations are highlighted by graphic symbols to alert the reader to the dangerous nature of
the operations:
DANGER
This symbol indicates the possibility of serious injury to the person
and / or substantial damage to the unit if the indicated instructions
are not followed
WARNING
This symbol indicates an important piece of information that must
be read and followed carefully.
READING
This symbol indicates an important piece of information and/or
procedures that are recommended to be read carefully.
Protective equipment to be worn
No maintenance operations must be carried out on the device without wearing the Personal
Protective Equipment (PPE) described below
Personnel involved in the installation or maintenance of the equipment must not wear clothes
with wide sleeves or laces, belts, bracelets or other items that may be dangerous, especially if
they are metallic.
Long hairs must be tied in such a way as to ensure that they are not a hazard.
The following symbols show the protective equipment that should be worn. The various items of
PPE must be selected and sized according to the nature of the hazard (particularly electrical)
posed by the equipment.
Protective footwear
Use: always
Protective eyewear
Use: always
Protective clothing
Use: always
Helmet
Use: when overhead structured are
present
Work gloves
Use: always

pg. 4 / 30 0MNPV364K55ENUG Rev.00
Definition of “operator” and “specialised technician”
The professional figure responsible for accessing the equipment for ordinary maintenance purposes is
defined by the term operator.
This definition covers personnel that know the operating and maintenance procedures for the equipment,
and that have been:
1. trained to operate in accordance with the safety standards relating to the dangers that may arise
where electrical voltage is present;
2. trained to use Personal Protective Equipment and to carry out basic first aid.
The professional figure responsible for the installation and start-up of the equipment, and for any
extraordinary maintenance, is defined by the term specialised technician.
This definition covers personnel that, in addition to the requirements listed above for a general operator,
must also:
1. have been suitably trained by the manufacturers or their representatives.
2. be aware of installation, assembly, repair and service procedures, and have a specific technical
qualification.
3. have a background of technical training, or specific training relating to the procedures for the safe
use and maintenance of the equipment.
Emergency Interventions
The following information is of a general nature.
First aid interventions
Company regulations and traditional procedures should be followed for any
first aid intervention that may be required.
Firefighting measures
Do not use water in case of fire, but only fire extinguishers that are suitable for
use with electrical and electronic equipment.
If exposed to heat or fire, some products may release toxic fumes into the
atmosphere. Always use a respirator when extinguishing a fire.
General Precautions
This manual contains detailed instructions for the use, installation and start-up of “NXE”.
Read the manual carefully before installation. The manual should be kept at hand and be consulted before
carrying out any operation on the device.
With the Unit, along with this manual, it is also supplied with:
•The “Safety and Compliance Manual”.
•The installation manual “Installation drawings" providing useful information for connecting and
installing the equipment.
•The “Display Manual” containing all of the information for monitoring the unit and for managing the
display-programmable functions.
Read the manuals carefully before installation and commissioning.
This device has been designed and manufactured in accordance with the standards for the product, for
normal use and for all uses that may reasonably be expected. It may under no circumstances be used for
any purposes other than those expected, or in any other ways than those described in this manual. Any
interventions should be carried out in accordance with the criteria and the time-frames described in this
manual.

0MNPV364K55ENUG Rev.00 pg. 5 / 30
Safety Precautions
CAUTION: Dangerous voltage can also be present inside the equipment even with the input, bypass, output
and battery switches open.
Removing the UPS enclosure by unauthorised personnel is a source of danger and may cause serious
injuries to the operator.
Read the “Safety and Compliance Manual”.
Enviromental Protection
In the development of its products, the company allocates abundant resources to analyse the environmental
issues.
All our products pursue the objectives defined in the environmental management system developed by the
company in compliance with applicable standards.
No hazardous materials such as CFCs, HCFCs or asbestos are used in this product.
When evaluating packaging, the choice of recyclable materials has been preferred.
For correct disposal, please separate and identify the type of material of which the packaging is made in the
table below. Dispose of all material in compliance with applicable standards in the country in which the
product is used
DESCRIPTION
ELEMENT
Pallet
Wood
(FOR)
Package box
Corrugated cardboard
(PAP)
Protective bag
High density
polyethylene (PE-HD)
Bubble wrap
Low density
polyethylene (PE-HD)
Disposing of the product
The UPS contains electronic cards and batteries which are considered TOXIC and HAZARDOUS waste.
When the product reaches the end of its operating life, please dispose of it in accordance with applicable
local legislation.
Disposing of the product correctly contributes to respecting the environment and personal health.

pg. 6 / 30 0MNPV364K55ENUG Rev.00
Thank you for choosing our product.
RIELLO Solar Tech. is highly specialized in the development and production of equipment for static energy
conversion. The inverters of the three-phase SIRIO series are high quality products, carefully designed and
manufactured to ensure optimum performance.
GENERAL PRECAUTIONS
This manual contains instructions for the use, installation and start-up of SIRIO inverters.
Read the manual carefully before installation. The manual should be kept close at hand
and consulted for information on using the equipment before carrying out any operation.
•The first connection to be made is the connection between the earth conductor and the
terminal with the symbol shown here:
•The inverter must not operate without an earth connection.
•The equipment must be installed and used in accordance with the instructions contained in
this document and in the manner suggested from time to time. RIELLO Solar Tech. is not
liable for defects or malfunctions resulting from improper use of the equipment, alterations
due to transport or particular environmental conditions, failure or improper servicing,
tampering or temporary repairs, and the use or installation by unqualified individuals.
•If the inverter is not used according to the manufacturer's specifications, the security
provided by the inverter could get lost.
•The operating and maintenance personnel and specialized technicians should be
adequately trained in the safe use and maintenance of the device. They should always
operate with due precaution and wear personal protective equipment (PPE).
•Maintenance must not be carried it inside the inverter when it is being powered from the
mains or the DC voltage. For maintenance switch the inverter off and open all the other
switches. Always use a multimeter to ensure that there are no dangerous voltages.
•There are dangerous voltages inside the equipment even when the input and output
switches are in the open position; trained personnel must wait around 20 minutes for the
capacitors to discharge before working on the inside of the inverter.
•The specialized technician must comply scrupulously with the following instructions for the
installation and maintenance of the inverter:
ouse insulated tools.
oobserve polarities.
oif the fuses need replacing, replace only with the same type.
othe replaced components must be disposed of in accordance with the legislation in
force in the country of installation.
•Do not deactivate the protection devices or ignore the warnings, precautions and alarms
described in this manual or those shown on data plates on the equipment.
•Promptly replace any danger signals if they should become illegible through usage.
•The inverter must be used only with all side and internal panels duly secured and with the
front door closed.
•Under no circumstances may the structure of the equipment, the devices mounted on it,
the operating sequence, etc. be modified, tampered with or altered in any way without first
consulting the manufacturers.
•All ordinary and extraordinary maintenance operations must be noted in the appropriate
register with the date, time, type of intervention, operator name and any other useful
information.

0MNPV364K55ENUG Rev.00 pg. 7 / 30
•Once the maintenance operations have been concluded, a thorough check should be
made in order to ensure that no tools and/or other materials have been left inside the
cabinet.
•In the event of faults or malfunctions, contact your local distributor or RIELLO Solar Tech.
All repair operations must be carried out by authorized technicians.
•Under no circumstances must water be used to clean the internal or external electrical
parts of the cabinet.
•Do not leave the device exposed to rain or to the elements. The device must be stored and
used in premises that comply with the environmental requirements set out in this user
manual.
Instructions for use
The purchased equipment is intended for professional use in industrial or commercial
environments. Shielded cables must be used for the connections to signal connectors.
Warning
Sale of this product is reserved for competent installers. Installation restrictions or
additional measures may be necessary in order to avoid problems.
CE Mark
The inverters of the SIRIO series come with CE marking; when used in accordance with the instructions in
this manual, they comply with the requirements of the following directives:
- LV Directive 2006/95/EC.
- EMC Directive 2004/108/EC.
No reproduction of any part of this manual, even partial, is permitted without the manufacturer’s authorization. The
manufacturer reserves the right to modify the product described herein, in order to improve it, at any time and
without notice.

pg. 8 / 30 0MNPV364K55ENUG Rev.00
Sommario
INTRODUCTION.....................................................................................................................................9
STORAGE ............................................................................................................................................10
INSTALLATION ENVIRONMENT ............................................................................................................10
PRELIMINARY OPERATIONS.................................................................................................................10
CHECKING THE PACKAGING................................................................................................................................10
POSITIONING......................................................................................................................................11
ELECTRICAL SYSTEM SETTINGS.............................................................................................................12
SYSTEM PROTECTION........................................................................................................................................12
PHOTOVOLTAIC FIELD /NETWORK CONNECTIONS..................................................................................................12
CONNECTORS FOR REMOTE COMMANDS,SIGNALLING AND COMMUNICATIONS..........................................................14
ETHERNET /USB.............................................................................................................................................17
CHECK CONNECTIONS.......................................................................................................................................17
START-UP PROCEDURE........................................................................................................................18
FUNCTIONAL CHECK............................................................................................................................19
SHUTDOWN........................................................................................................................................19
PERSONALIZATIONS............................................................................................................................19
OPERATION ........................................................................................................................................20
MAINTENANCE ...................................................................................................................................21
GENERAL CHARACTERISTICS ................................................................................................................22
INVERTER USER PANEL FUNCTIONS. ....................................................................................................26
GENERAL DESCRIPTION.....................................................................................................................................26
ALARM MESSAGES ...........................................................................................................................................27
CONTROL PANEL .................................................................................................................................29

0MNPV364K55ENUG Rev.00 pg. 9 / 30
INTRODUCTION
This document describes the features of the Three-phase Solar Converters of the SIRIO series without
isolation transformer dedicated to medium voltage connection.
The SIRIO inverter is used to transfer the energy produced by a photovoltaic generator to the three-phase
power distribution system. The MPPT (Maximum Power Point Tracking) feature ensures that the power is
drawn from the photovoltaic modules with the operating point continuously optimized in relation to the
irradiation conditions, the characteristics of the panels, their temperature and the converter
characteristics.
The system is designed to allow it to feed into the network a current with a sinusoidal waveform and
uniform power factor in all operating conditions.
The operating parameters and electrical values can be displayed locally, by means of the alphanumeric
LCD display.
The functions listed above are obtained by means of power electronic architecture of the PWM (Pulse
Width Modulation) type using semiconductors of the IGBT (Insulated Gate Bipolar Transistor) type and a
microprocessor-based control logic which can carry out all the required processing in real time.
As example the figure below shows the K500 HV MT inverter block diagram:
•EMC filters: these are used to reduce conducted radiofrequency emissions on both the
photovoltaic modules and on the AC network
•Power Module: this is the section in which the energy from the photovoltaic modules is converted
from direct current into alternating current.
•AC filter: its function is to recreate a sinusoidal current waveform by eliminating the high
frequencies generated by the inverter stage.
•Contactor: separates the inverter from the AC network during periods of non-operation.
•DC disconnector: disconnects the photovoltaic field from the inverter to allow maintenance to be
carried out on the inverter. K330 and K500 models use an automatic DC disconnector with motor.
•AC disconnect switch: disconnects the inverter from the AC network in the event of maintenance
and is triggered to protect the network in the event of an internal fault in the AC section of the
device
•Control system: this is the heart of the entire system that manages all parts of the equipment.
•Communications: for local monitoring (LCD display with touch screen) of inverter operation or
remote monitoring by means of appropriate electrical connections.
AC FILTEREMC FILTER EMC FILTER
Power Module
Control
Comm
M

pg. 10 / 30 0MNPV364K55ENUG Rev.00
STORAGE
If the inverter is not installed immediately, it should be stored with its original packaging and protected
from humidity and the elements. The storage premises should comply with the following characteristics:
Temperature: -25°C ÷ + 60°C (-13°F ÷ 140°F)
Relative humidity 5 - 95%
Recommended storage temperature is between +5°C and +40°C.
INSTALLATION ENVIRONMENT
The equipment has been designed for indoor installation. The choice of premises for installation should
comply with the points set out below:
avoid dusty environments;
ensure that the floor can support the weight of the inverter;
avoid narrow environments that could hinder normal maintenance operations;
avoid placing the device in areas exposed to direct sunlight or heat;
ensure that the ambient temperature, with inverter operating, is less than:
operating temperature: -20 ÷ +50°C
maximum temperature for 8 hours a day: + 45°C
average temperature for 24 hours: + 35°C
Relative humidity 5 -95%
N.B.: the operating temperature recommended for the lifetime of the inverter is between 10°C and 35°C.
A heat dissipation system is required to keep the temperature in the installation site within this field (the
value of the power dissipated by the inverter is shown in the section “GENERAL CHARACTERISTICS).
PRELIMINARY OPERATIONS
Checking the packaging
•Upon receipt of the inverter, check that the packaging has not been damaged during shipping.
•Check that neither of the two impact resistant devices on the packaging has turned red; if one of
them should be red, follow the instructions on the packaging.
•Care should be taken when removing the packaging in order to avoid scratching the inverter
cabinet.
•The device must be handled with care; it may be damaged if knocked or dropped.
•This technical user manual is supplied with the inverter.
The device should only be handled by appropriately trained personnel. It can be unloaded from the vehicle
and put into place by lifting the box or the wooden deck to which the equipment is secured with a fork-lift
truck. A trans pallet or fork-lift truck should be used for the permanent positioning of the equipment, in
accordance with the instructions provided below.

0MNPV364K55ENUG Rev.00 pg. 11 / 30
(1) Insert the forks of the fork-lift truck in the lower part of the device, from the front or back, and
ensure that they stick out about 30 cm on the other side. If a trans pallet is used, raise the
device only as much as is strictly necessary.
(2) Secure the device to the trans pallet or fork-lift before moving it.
Risk of overturning
In order to avoid the risk of the device overturning, ensure that it is firmly secured to the
trans pallet or fork-lift truck by means of appropriate ropes before moving it.
The cabinet should be handled with care during these operations, since knocks or drops can damage it.
Once in position, remove the packaging carefully so as not to scratch the device.
The packaging should be removed as follows:
•Cut the bands
•Carefully remove the cardboard packaging from above.
•Remove the screws securing the cabinet to the wooden base.
•If using a trans pallet, remove the device from the pallet and place it on the floor, using the same
precautions as set out in the section on Handling.
POSITIONING
Cooling air enters the inverter from underneath and through the grilles located on the front of the door
and exits through the ventilation grilles which are either at the top of the device or at the back, depending
on the size of the equipment.
The following points should be taken into account when positioning the inverter:
•leave a free space of at least one meter at the front of the equipment to allow for
maintenance operations.
•ensure a distance of at least 60 centimeters from the ceiling so as not to hinder air extraction.
•The DC and AC cables should enter from the back of the cabinet. The power and signal cables
should be connected from the front.

pg. 12 / 30 0MNPV364K55ENUG Rev.00
ELECTRICAL SYSTEM SETTINGS
System protection
Ground
The minimum size of the ground conductor is equal to the greater of:
- Half of the total cross-section of the conductors of a phase of the AC section
- Half of the total cross-section of a cable polarity DC
AC output
An automatic magneto-thermal switch is provided on the inverter AC output line. Since this switch cannot
protect the line connected to the inverter from any faults on the line, an appropriate protection device,
sized according to the table above and to the characteristics of the cable that has been laid, is provided
upstream of this switch.
IMPORTANT NOTES:
- The common mode output voltage has high frequency peak values up to ± 1100V respect to ground, then
choose appropriate cables for connecting the AC line.
- In order to reduce noise to surrounding equipment, we recommend the use of shielded cables and a
maximum length of 15 meters.
DC input
A disconnector with an appropriately sized fuse is provided on the DC input line.
OPTIONAL: K330 and K500 models are available with 6 and 8 fused input with gPV 160A fuses for both
plus and minus polarity.
Photovoltaic field / network connections
The operations described in this chapter must be carried out exclusively by trained personnel.
The first connection to be made is the earth conductor, which is indicated with the symbol:
Refer to the installation drawings for the mechanical dimensions of the inverter.
The drawings identify:
•the position of the holes in the base for the possible fixing of the equipment to the floor;
•the view of the support on the floor for the sizing of a possible structure to raise the
cabinet;
•position of the cable entry;
•the position of the inverter fans.

0MNPV364K55ENUG Rev.00 pg. 13 / 30
THE INVERTER MUST NOT OPERATE WITHOUT AN EARTH CONNECTION.
Before making the connection, open all the switches on the device and ensure that the inverter and the
lines to be connected are completely isolated from the power sources (photovoltaic field and AC power
line).
More specifically, check that:
-the line from the photovoltaic field is isolated from the field;
-the inverter disconnectors SWIN and SWOUT are in the open position;
-the DC switch Key lock is activated (K330 and K500 models)
-there are no dangerous voltages (DC and AC), by using a multimeter on both the cables and the
inverter terminals
The inverter must be connected to a three-phase AC network (no neutral conductor is required)
ungrounded (IT system)
Each inverter requires a separate LV / MV transformer or at least a dedicated winding. It is not
allowed to parallel inverters. The LV winding of the transformer is not to be earthed.
WARNING: observe the cyclical direction of the phases.

pg. 14 / 30 0MNPV364K55ENUG Rev.00
Connectors for remote commands, signalling and communications
Open the front door of the inverter to access the interface cards:
Communications card (RS232 + EPO + REMOTE CONTACTS)
B - EPO connector (emergency power off command)
If jumper B on the connector is opened, the inverter will shut down and disconnect from the distribution
grid. The inverter is factory-fitted with the EPO terminals short-circuited. With this input, in a hazardous
situation the inverter can be shut down from a remote position simply by pressing a button.
Warning: normal operation cannot be restored simply by closing the jumper. This requires an operator to
take appropriate action on the inverter control panel.
In K64, K80 and K100 the EPO command disconnects the inverter from the network, but
does not open the connection with the photovoltaic field. Dangerous voltages may still be
present in the device.
C - REMOTE
The connector comprises the following features:
1 12Vdc 80mA(max.) power supply
3 potential-free change-over contacts for alarms;
2 remote commands to block the inverter
- the connector has the following pin configuration:
RS232-1 (D)
RS232-2 (E)
EPO (B)
REMOTE (C)
GND
GND
+12V
EPO
Stop inverter non memorizzato
Faults present
Inverter blocked
Normal operation
14
13
12
11
10
9
8
7
6
5
4
3
2

0MNPV364K55ENUG Rev.00 pg. 15 / 30
- Normal operation: the inverter is connected to and supplies energy to the network; it is normal
for this signal not to be displayed, even when there are no faults or blocks, during poor irradiation
conditions (night-time) or if the AC network is not adequate.
- Inverter blocked by command or contact: the inverter has been blocked by a command or by
the triggering of a contact; specific action by the operator is required to restore operation
-Faults present: the inverter is blocked due to an internal failure
N.B. The position of the contacts as shown is with the condition present.
The contacts have a max. current flow of 0.5A at 42V.
REMOTE COMMANDS
Two commands are available:
•BLOCK INVERTER. Connect terminal 11 and terminal 12 to each other (for at least 2
seconds).(command not saved: when the contact is opened again, the inverter will resume normal
operation).
•INVERTER EMERGENCY STOP (EPO). If the jumper between terminals 13 and 14 is
opened, the inverter will block. (command saved: when the contact is opened again, the
inverter will remain in a blocked state until the command is cancelled using the command
display)
D-E RS232
2 DB9 connectors are available for RS232 connection.
The factory-set transmission protocol is the following:
9600 baud, -no parity, -8 bits, -1 stop bit.
See the diagrams below for the connection procedures.
D - DB9 female RS232-1
Use a standard cable for connection with a
computer.
See the figure for connection with a modem.
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
female
femmina
DB9
female
femmina
DB9
male
maschio
DB9
male
maschio
DB9
UPS
RS232-1
computer
Modem
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
female
femmina
DB9
female
femmina
DB9
male
maschio
DB9
male
maschio
DB9
UPS
RS232-1
INV
INV

pg. 16 / 30 0MNPV364K55ENUG Rev.00
E - DB9 male RS232-2
Use a standard cable for connection with a modem.
Use a null-modem cable for connection with a
computer (see figure).
SLOTS 1-2 , the following cards may be inserted in these slots (optional):
- RS485 board: provides an RS485 connection for connection of the inverter to remote devices.
- Netman PV: device for managing the inverter's Ethernet network, able to send information on the
status of the machine with different protocols:
• TCP / IP UDP (compatible with Sunvision software)
• HTTP (to view the status with a browser);
• FTP (for data transfer).
SYSTEM SLOT , housing in which to insert the optional RS485 card for connecting the PV Control Box
accessory. See the manual of the accessory for additional information.
Note: the use of SYSTEM SLOT prevents the use of the RS232-1 and vice versa.
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
female
femmina
db9
female
femmina
db9
male
maschio
db9
male
maschio
db9
UPS
RS232-2
Computer
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
female
femmina
DB9
female
femmina
DB9
male
maschio
DB9
male
maschio
db9
UPS
RS232-2
Modem
INV
INV

0MNPV364K55ENUG Rev.00 pg. 17 / 30
Ethernet / USB
A USB port and an Ethernet port are available on the Touch Screen for downloading historical data and
monitoring of the inverter. Refer to the specific documentation for details on possible connections.
Check connections
Once the EARTH, INPUT and OUTPUT cables have been connected and before replacing the terminal board
cover, check that:
all the input/output terminals are tightly closed;
all the fuse blocks have fuses inserted and are in the closed position;
the protection conductor is correctly connected.

pg. 18 / 30 0MNPV364K55ENUG Rev.00
START-UP PROCEDURE
Once the electrical connections have been made as indicated above and after replacing the switch cover
panel, the inverter can be started up; carry out the following operations in this order:
-open the door of the inverter to access the input switches;
-close any input/output switches located outside the inverter;
-check that the DC voltage from the photovoltaic field is within the inverter’s accepted range; also
check that the polarity is correct.
-For K64 –K250 inverters close the input and output inverter switches (the label is shown on the
switches panel: SWIN DC side disconnector, SWOUT network side switch)
-For K330 –K500 close SWOUT and remove the KEY lock of SWIN
At first start-up it is necessary to enter the country in which the inverter is installed so that the voltage and
frequency protection settings are adjusted accordingly. Press the arrow keys until the country desired is
displayed and then press on the "earth" to move to the next screen.
If the selection made is correct press the button with the checkmark to confirm the selection.
ATTENTION: the only way to change the selection made is to contact the RIELLO Solar Tech. technical
assistance office.
Once the above operations are complete, if the radiation conditions allow, the inverter will start up and
connect to the grid after a pause (which lasts from about 10 seconds to 3 minutes depending on local
regulations).
On the lower line of the panel the message NORMAL OPERATION should appear, while on the upper line
the inverter model will appear.
N.B.: In the absence of AC power the inverter is not powered and the display remains off even when there
is DC power coming from the photovoltaic modules. It is therefore necessary to supply power on the AC
side in order to switch on the inverter.
If the message "Inverter OFF" is displayed on the screen it means the inverter is "disabled". Therefore it
must be enabled with the following key sequence:
Then press to return to the main screen.

0MNPV364K55ENUG Rev.00 pg. 19 / 30
FUNCTIONAL CHECK
The correct operation of the inverter is shown on the LCD display by the normal operation message.
During irregular irradiation conditions, the inverter may switch off and display the “low irradiation”
message. Restart after an event of this kind is delayed, even when the DC voltage is sufficient, and the
countdown time to restart is shown on the display. The countdown will not take place if the voltage is
lower than the restart limit.
SHUTDOWN
This operation will cause the inverter to shut down and disconnect from the AC power grid.
Shutdown procedure:
Press to return to the main screen.
-open SWOUT, output switch;
-open SWIN, input switch and activate the Key lock if available.
Although no damage is caused to the inverter by opening the input and output disconnectors while the
inverter is switched on, it is recommended to carry out the shutdown procedure before opening the
disconnectors.
To restore normal inverter operation, perform the same operations carried out in the chapter start-up
procedure
PERSONALIZATIONS
Refer to the documentation on the website www.riello-solartech.it the customizations that can be made
from the control panel.

pg. 20 / 30 0MNPV364K55ENUG Rev.00
OPERATION
The operation of the inverter is fully automatic and does not need any user intervention. Once it has been
connected to the photovoltaic generator and the three-phase distribution grid and has been enabled, the
inverter will appropriately manage the start-up, shutdown and any other aspect of the equipment.
Once it has been enabled (which is saved even if there is no power supply), the inverter checks the
parameters of the AC network (voltage and frequency) and of the photovoltaic modules (no-load voltage);
if all the values are within the correct ranges for a suitable time (the count is shown on the display), the
conversion process will start, preceded by the connection of the inverter to the network by closing the
remote switch.
The MPPT algorithm integrated in the control system looks for the operating condition that is best suited
to the external conditions (essentially irradiation and temperature of the modules).
When the irradiation conditions are such that the power injected into the network is very low (<1%), the
control system shuts the inverter down after a few minutes and puts it into a wait state. This situation will
last until the solar radiation is sufficient to allow a new start-up and connection to the network.
In order to avoid the converter operating “in island mode”, some systems have been implemented which
can destabilize a possible condition of balance between the inverter and local loads. In the event of
electrical parameters going outside the permitted field, the inverter will activate protection devices and
disconnect from the network until the rated conditions for the AC network are restored. If these
protection devices are triggered, a pause is inserted before inverter operation can be resumed; the length
of the pause depends on local legislation.
It should be noted that, for the Italian market, these protection devices cannot replace what are known as
“interface protection devices” since current legislation imposes the presence of dedicated external
protection devices when inverter power is greater than 20KW or when more than three inverters are
connected at the same time.
The control system naturally also implements all the protection devices required to protect the converter
from external faults. Suitable protection devices against overcurrents, overvoltages and overtemperatures
inside the device are also used.
The inverter has a protection device to prevent stops due to overtemperature; when the temperature on
the power transistor radiators exceeds a first alarm threshold, the maximum inverter power is gradually
decreased from 110% to 100%. If a second alarm threshold is exceeded, the power is gradually decreased
even more so as to keep the temperature of the heat sinks within the maximum limit. With an ambient
temperature lower than 45°C and unobstructed heat sinks, the inverter can manage the rated power
without limitations.