Sungrow SG3125HV-20 User guide

SSGG33112255HHVV--2200//SSGG33440000HHVV--
2200TTuurrnnkkeeyy SSttaattiioonnSSyysstteemm
MMaannuuaallSSGG33112255HHVV__33440000HHVV--2200--
SSEENN--VVeerr111122--220022000077
SG3125HV_3400HV-20-SEN-Ver112-202007
SG3125HV-20/SG3400HV-20
TTuurrnnkkeeyy SSttaattiioonn
SSyysstteemm MMaannuuaall

I
CCoonntteennttss
1 About This Manual ....................................................................................... 1
1.1 Validity ......................................................................................................... 1
1.2 Content........................................................................................................ 1
1.3 Target Group................................................................................................ 1
1.4 Symbols Explanation.................................................................................... 2
1.5 How to Use this Manual................................................................................ 3
1.6 Terminology................................................................................................. 3
2 Safety Instructions ...................................................................................... 4
2.1 Intended Usage............................................................................................ 4
2.2 Important Safety Instructions........................................................................ 4
2.2.1 General Safety Rules .......................................................................... 5
2.2.2 Manual Storage.................................................................................. 5
2.2.3 PV Arrays Hazards.............................................................................. 6
2.2.4 Ground Fault Protection...................................................................... 6
2.2.5 Live Line Measurement....................................................................... 6
2.2.6 Measuring Instrument......................................................................... 6
2.2.7 Volt-free Operations ........................................................................... 7
2.2.8 ESD Protection ................................................................................... 7
2.2.9 LCD Parameter Setting ....................................................................... 7
2.2.10 Sand and Moisture Protection........................................................... 7
2.2.11 Symbols on the Device Body............................................................. 7
2.2.12 Safety Warning Signs ....................................................................... 8
2.2.13 Daily Operation and Maintenance ..................................................... 8
2.2.14 Disposal of Waste............................................................................. 8
2.2.15 Manual Description........................................................................... 9
3 Product Description .................................................................................. 10
3.1 Overall Design of the Inverter...................................................................... 10
3.1.1 Inverter Views................................................................................... 10
3.1.2 Mechanical Parameter...................................................................... 11
3.1.3 Ventilation Design............................................................................. 12
3.2 Interior Design of the Inverter...................................................................... 12

II
3.2.1 Internal Components ........................................................................ 12
3.2.2 Cable Entry Design ........................................................................... 13
3.2.3 Internal Devices of the Inverter.......................................................... 15
3.2.4 Operations on the DC and AC Side.................................................... 16
4 Delivery ......................................................................................................... 19
4.1 Scope of Delivery....................................................................................... 19
4.2 Identifying the Inverter................................................................................ 20
4.3 Checking for Transport Damages ............................................................... 20
4.4 Storage of the Inverter................................................................................ 21
5 Mechanical Installation ............................................................................ 22
5.1 Transport ................................................................................................... 22
5.2 Hoisting the Inverter ................................................................................... 23
5.2.1 Safety Precautions ........................................................................... 23
5.2.2 Hoisting............................................................................................ 24
5.2.3 Fastening of Connectors................................................................... 25
5.3 Foundation................................................................................................. 26
5.3.1 Selection of Installation Site .............................................................. 26
5.3.2 Foundation Requirements................................................................. 26
5.3.3 Recommended Foundation Construction Plan .................................. 27
5.3.4 Fixing the Inverter ............................................................................. 28
5.3.5 Other Precautions............................................................................. 28
5.4 Clearance Requirement.............................................................................. 29
5.5 Removing Sealing Tapes............................................................................ 29
6 Electrical Installation ................................................................................ 30
6.1 Safety Instructions...................................................................................... 30
6.1.1 Generals Rules ................................................................................. 30
6.2 Preparation before Electrical Connections .................................................. 32
6.2.1 Installation Tools............................................................................... 32
6.2.2 Cable Crimping................................................................................. 33
6.2.3 Parts for Cabling............................................................................... 33
6.2.4 Opening the Inverter Door................................................................. 35
6.2.5 Opening the Cable Entries ................................................................ 35
6.2.6 Checking the Cables......................................................................... 35
6.2.7 During Connection............................................................................ 35
6.3 Circuit Diagram and Cable Connection ....................................................... 36
6.3.1 Circuit Diagram................................................................................. 36

III
6.3.2 Cable Specifications......................................................................... 36
6.4 DC Connection........................................................................................... 37
6.4.1 Checking before Connection............................................................. 37
6.4.2 DC Cable Connection ....................................................................... 37
6.5 AC Connection........................................................................................... 39
6.5.1 Safety Notices.................................................................................. 39
6.5.2 AC Cable Connection........................................................................ 40
6.6 Ground Connection.................................................................................... 43
6.7 Communication Connection ....................................................................... 45
6.8 External Power Supply Connection............................................................. 46
6.9 Finishing Electrical Connection................................................................... 47
7 Disconnecting and Reconnecting the Syetem ................................. 48
7.1 Power Connection Point Overview.............................................................. 48
7.2 Disconnecting the System.......................................................................... 48
7.2.1 Disconnecting the Inverter ................................................................ 49
7.2.2 Disconnecting the MV Transformer ................................................... 50
7.2.3 Disconnecting the PV Combiner Box ................................................. 50
7.3 Reconnecting the System........................................................................... 50
7.3.1 Reconnecting the MV Transformer.................................................... 51
7.3.2 Reconnecting the PV Combiner Box.................................................. 51
7.3.3 Reconnecting the Inverter ................................................................. 51
8 Commissioning ........................................................................................... 53
8.1 Safety Instructions ..................................................................................... 53
8.2 Requirements of Commissioning................................................................ 54
8.3 Checking before Commissioning................................................................ 54
8.3.1 Checking the Cable Connection ........................................................ 54
8.3.2 Checking the Inverter Switches......................................................... 54
8.3.3 Checking PV Array............................................................................ 54
8.3.4 Checking Grid Voltage...................................................................... 55
8.4 Preparation before Starting ........................................................................ 56
8.5 Starting the Device..................................................................................... 56
8.6 LCD Parameter Setting............................................................................... 56
8.7 Completing Commissioning........................................................................ 56
9 Starting/Stopping ...................................................................................... 58
9.1 Starting ...................................................................................................... 58
9.1.1 Inspection before starting ................................................................. 58

IV
9.1.2 Start Steps........................................................................................ 58
9.2 Stopping .................................................................................................... 59
9.2.1 Normal Stop ..................................................................................... 59
9.2.2 Stop in Case of Fault......................................................................... 59
10 LCD Menu Operation ............................................................................. 61
10.1 LCD TouchScreen.................................................................................... 61
10.2 Default Screen ......................................................................................... 61
10.2.1 Initialization..................................................................................... 61
10.2.2 Default Screen Introduction ............................................................ 61
10.2.3 Backlight and Screensaver ............................................................. 62
10.3 Overview of LCD Menu and Icon .............................................................. 62
10.3.1 Overview of Submenu and Icon ...................................................... 62
10.3.2 Layout of the submenus ................................................................. 63
10.4 Entering Password................................................................................... 64
10.5 Language Setting..................................................................................... 65
10.5.1 Conventional Way .......................................................................... 65
10.5.2 Shortcut ......................................................................................... 65
10.6 Setting Date and Time ............................................................................. 65
10.7 Checking Running Information ................................................................. 66
10.8 Checking History Information .................................................................. 66
10.8.1 Checking History Event .................................................................. 66
10.8.2 Checking History Data ................................................................... 67
10.8.3 Checking History Fault ................................................................... 67
10.8.4 Checking History Alarm ................................................................. 67
10.9 Checking Present Fault Information ......................................................... 67
10.10 Starting/Stopping................................................................................... 68
10.11 Loading Default...................................................................................... 68
10.12 Checking Firmware Version ................................................................... 69
10.13 Parameters of LCD................................................................................. 69
10.13.1 Communication Parameters ......................................................... 69
10.13.2 Running Parameters..................................................................... 70
10.13.3 Protection Parameters .................................................................. 80
11 Main Functions ........................................................................................ 89
11.1 Operation Mode....................................................................................... 89
11.1.1 Mode Change................................................................................. 89
11.1.2 Operation Mode Description ........................................................... 89
11.2 Active Power Limitation............................................................................ 91

V
11.2.1 Introduction to Active Power Limitation............................................ 91
11.2.2 How to Realize Power Limitation ..................................................... 91
11.3 Reactive Power Adjustment ..................................................................... 92
11.4 Low Voltage Ride Through (LVRT) ............................................................ 93
11.5 High Voltage Ride Through (HVRT) ........................................................... 93
11.6 Temperature Derating .............................................................................. 94
11.7 MPPT....................................................................................................... 94
11.8 Intelligent Temperature-Control Technology ............................................. 95
11.9 Insulation Monitoring Function.................................................................. 95
11.9.1 Introduction .................................................................................... 95
11.9.2 Simple Troubleshooting .................................................................. 95
11.10 Protection Function................................................................................ 96
11.10.1 DC Over-voltage Protection .......................................................... 96
11.10.2 AC Over/under-voltage Protection ................................................ 96
11.10.3 Frequency Anomaly Protection..................................................... 96
11.10.4 Islanding Protection...................................................................... 96
11.10.5 Overload Protection...................................................................... 97
11.10.6 Ground Protection ........................................................................ 97
11.10.7 Module Over-temperature Protection............................................ 97
11.10.8 Internal Over-temperature Protection............................................ 97
12 Troubleshooting ....................................................................................... 98
12.1 Safety Instructions.................................................................................... 98
12.2 Checking Fault ........................................................................................ 98
12.3 Fault and Troubleshooting on the Inverter ................................................. 99
12.4 Other Fault and Troubleshooting ............................................................ 110
13 Routine Maintenance ........................................................................... 111
13.1 Safety Instructions.................................................................................. 111
13.2 Maintenance.......................................................................................... 112
13.2.1 Introduction .................................................................................. 112
13.2.2 Maintenance Interval .................................................................... 112
13.3 Cleaning the Inverter .............................................................................. 116
13.3.1 Introduction .................................................................................. 116
13.3.2 Cleaning Interval........................................................................... 116
13.3.3 Cleaning the Internal Dust ............................................................. 116
13.3.4 Cleaning the Foundation............................................................... 117
13.3.5 Checking and Cleaning the Filter .................................................. 117

VI
13.3.6 Cleaning the Surface of the Inverter .............................................. 118
13.3.7 Checking the Lock and Hinge ....................................................... 118
13.3.8 Checking the Sealing Strip ............................................................ 118
13.4 Painting Make-up Measures................................................................... 118
13.5 Replacing the Electrical Components ..................................................... 122
13.5.1 Safety Instructions........................................................................ 122
13.5.2 Replacing DC Fuses ..................................................................... 122
14 Appendix .................................................................................................. 126
14.1 System Parameters................................................................................ 126
14.2 Tightening Torques................................................................................. 127
14.3 Exclusion of Liability ............................................................................... 128
14.4 Contact Information ............................................................................... 128

1
1 About This Manual
1.1 Validity
This manual is intended for the following product:
•SG3125HV-20
•SG3400HV-20
1.2 Content
This manual contains the following information:
CCoonntteenntt DDeessccrriippttiioonn
Safety
instruction
Safety instructions on the installation, operation, maintenance, and
troubleshooting of the Turnkey Station
Product
Description The appearance and internal components of the Turnkey Station
Delivery Delivery and inspection after receiving the Turnkey Station
Installation Mechanical transport, installation, and electrical connection of the
Turnkey Station
Commissioning Safety notices and commissioning process when the Turnkey
Station is powered on for the first time
Start/Stop Steps of starting and stopping the Turnkey Station internal devices
during normal maintenance or troubleshooting
Operation on
LCD Display Function and use of the Turnkey Station user interface
Functions Descriptions of the Turnkey Station main functions
Troubleshootin-
gSimple troubleshooting of the Turnkey Station
Daily operation Instructions on and guides to the daily operation of the Turnkey
Station
1.3 Target Group
This manual is for technical personnel who are responsible for the transport, installation
and other operations on the Turnkey Station. Only qualified personnel can perform the
installation, maintenance, and troubleshooting. Unauthorized persons should not

2
perform any operation on the Turnkey Station and should be away from the Turnkey
Station to avoid potential hazards. Qualified personnel are:
•Equipped with certain electrical wiring and mechanical knowledge and familiar with
electrical and mechanical principle diagram
•Familiar with the construction and working principle of the PV grid-connected power
generation system
•Familiar with the construction and working principle of the Turnkey Station upstream
and downstream equipment
•Trained especially in the installation and commissioning of electrical devices
•Capable of coping with the dangerous and emergency situations during the
installation and commissioning
•Familiar with the country/regional standards and specifications
•Familiar with this manual
1.4 Symbols Explanation
This manual contains important safety and operational instructions that must be
accurately understood and respected during the installation and maintenance of the
equipment.
To ensure the optimum use of this manual, note the following explanations of the
symbols used.
DANGER indicates a hazard with a high level of risk which, if not avoided, will
result in death or serious injury.
WARNING indicates a hazard with a medium level of risk which, if not avoided,
could result in death or serious injury.
CAUTION indicates a hazard with a low level of risk which, if not avoided, could
result in minor or moderate injury.
NOTICE indicates a situation which, if not avoided, could result in equipment or
property damage.
1 About This Manual System Manual

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NOTE indicates additional information, emphasized contents or tips to help
you solve problems or save time.
The symbols below may be found on the electrical parts of the inverter. Make sure to
read the following symbols and fully understand them before installing the equipment.
SSyymmbbooll EExxppllaannaattiioonn
Lethal voltage inside! Do not touch!
Hot surface! Do not touch the hot surface of the device.
Protective earth. Earthing securely to ensure personal safety.
1.5 How to Use this Manual
Read this manual and other related documents before transporting and installing the
inverter. Documents must be stored at hand and available at all times.
All rights reserved including the pictures, markings and symbols used. Any reproduction
or disclosure, even partially, of the contents of this manual is strictly forbidden without
prior written authorization of Sungrow.
The contents of the manual will be periodically updated or revised due to the product
development. It is probably that there are changes of manual in the subsequent module
edition.
1.6 Terminology
NNaammee FFoorr sshhoorrtt
Turnkey Station Inverter
Module unit/ Inverter unit Unit
Intelligent power distribution
cabinet Intelligent PMD or PMD
The foregoing devices are expressed in the abbreviation form in this document unless
otherwise specified.
System Manual 1 About This Manual

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2Safety Instructions
2.1 Intended Usage
The inverter, designed and manufactured by Sungrow, is mainly applied to large-and-
medium PV power station. The inverter can meet the requirements of modular design
and quick installation for large-and-medium PV power station and can ensure the long-
term, reliable, and safe feed-in operation.
The PV power generation system with the inverter is shown in the following figure.
NNoo.. NNaammee
A PV Array
B PV Array Combiner Box
CInverter
D Transformer
EUtility Grid
Installation of the inverter not in compliance with the description in this manual
or installation or modification of the device without authorization from Sungrow
may lead to personal injuries or device damages and may void pertinent
warranty claims from Sungrow.
2.2 Important Safety Instructions
Read the safety instructions carefully before installing the inverter. Refer to
corresponding manuals for the safety instructions on the internal devices.

5
2.2.1 General Safety Rules
Touching the terminals or contactors connected to the grid may lead to electric
shock!
•Do not touch the terminals or conductors connected to the grid.
•Respect all safety instructions on the grid connection.
Lethal voltages are present inside the device!
•Pay attention to and follow the warning signs on the device.
•Respect all safety instructions in this manual and other pertinent documents.
Electric shock or fire may occur due to device damage or system fault.
•Visually inspect the inverter for device damages or other hazards.
•Check if the external devices and circuit connections are safe.
•Only operate the device when it is safe to do so.
All installations and operations on the inverter must be in full accordance with
the national and local regulations and standards.
2.2.2 Manual Storage
Product manuals are an indispensable part of the product. Important information about
the transport, installation, maintenance, and troubleshooting of the inverter is included in
this manual. All the descriptions in this manual, especially those safety-related items,
must be complied with. Read all the instructions thoroughly prior to performing any
operation work on the inverter.
•Transport, install, maintain, and service the inverter strictly following the descriptions
in this manual. Device damage, personal injury, or property loss be caused if
otherwise.
•This manual and relevant documents should be available for relevant persons at all
times.
System Manual 2 Safety Instructions

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2.2.3 PV Arrays Hazards
DC high voltage! Electric shock hazards!
When exposed to sunlight, PV array will produce voltage, which is very high in
large-scale power station
Death from burning and electric shock due to touching the PV array.
During installation, maintenance, and troubleshooting of the device, ensure that:
•The inverter is disconnected from the PV array.
•Necessary warning signs are in place to prevent inadvertent reconnection.
2.2.4 Ground Fault Protection
If a ground fault occurs in the PV system, some parts that are supposedly
voltage-free may carry lethal voltage. Accidental touch may cause serious
damage. Make sure there is no system ground fault before performing
operation and take proper protective measures.
2.2.5 Live Line Measurement
High voltages are present inside the device. Death can result from burning and
electric shock due to touching the live components of the inverter. During live
line measurement,
•use suitable protective equipment, for example, dielectric gloves, and
•accompanied by other persons.
2.2.6 Measuring Instrument
The instrument for measuring the electrical parameters should meet the following
requirements:
•The instrument for measuring the electrical parameters should be a high-
quality instrument with sufficient measuring range.
•Make sure the connection and use of the instrument are correct to avoid arc
and other dangerous situations.
•Use suitable protective equipment, for example, dielectric gloves during live
line measurement.
2 Safety Instructions System Manual

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2.2.7 Volt-free Operations
Perform operations on the inverter only when all devices inside the inverter are
completely voltage-free.
•Avoid any inadvertent re-connections.
•Verify that no voltage or current is present with appropriate measurement instrument.
•Ground and short-circuit whenever necessary.
•Cover possible live parts to avoid inadvertent touch.
•Ensure sufficient escape room.
•After the inverter stops, wait at least 10 minutes before operating it.
•Ensure that the inverter is completely voltage-free.
2.2.8 ESD Protection
Devices may be damaged irreversibly by electrostatic discharge (ESD).
•Avoid unnecessary touching of the PCB.
•Observe all the ESD-related safety instructions. Wear proper personal
protective equipment (PPE) such as wrist strap.
2.2.9 LCD Parameter Setting
Some settable parameters on the LCD are closely related to the operations of the
inverter and internal devices. Thereforethese parameters can only be set with reliable
evaluation of the system.
•Improper parameter setting may impair the functionality of the device.
•Only qualified personnel can set the parameters.
2.2.10 Sand and Moisture Protection
Do not open doors of the inverter on sandstorm, thunderstorm, strong wind or hail days
or when the ambient humidity is above 95%.
2.2.11 Symbols on the Device Body
Symbols on the device contain important information on safe operations of the inverter
and its internal devices. Do not tear or damage them!
System Manual 2 Safety Instructions

8
Do not damage or tear the symbols.
•All symbols on the device body must be clearly legible.
•Replace the symbols once any damage or illegibility is detected.
2.2.12 Safety Warning Signs
During transport, installation, maintenance, and troubleshooting of the inverter, keep
unauthorized persons away.
•Post warning signs near the inverter upstream and downstream switches to prevent
inadvertent connection.
•Place necessary warning signs or barriers near the on-site operation areas.
2.2.13 Daily Operation and Maintenance
Make sure the doors of the inverter are closed and locked during daily operation to
prevent internal devices from damages caused by rain or rodents.
Regularly check and maintain the inverter and internal devices to ensure long-term and
reliable operation of the inverter.
Take proper insulation protection measures during live line operation. At least
two persons are required until the operation is performed.
Proper field rescue facilities are required since most PV stations are installed in
places far away from the urban areas.
Take the followings into consideration during daily operation and maintenance:
•The nameplate is found on the inverter body. It contains important parameter
information of the devices. Protect the nameplate during all operations.
•Heating components may exist inside the inverter. When the device stops, the
heating components may be still hot. Wear proper gloves when working on them.
•Maintain the cooling fans inside the inverter only when the fans stop rotating.
•Wear proper PPE, such as safety glasses, safety footwear, and safety gloves, if
necessary.
•Necessary auxiliary measures are recommended to ensure personal and device
safety.
2.2.14 Disposal of Waste
When the inverter has come to the end of its service life, it cannot be disposed of
together with household wastes. Some inside components can be recycled while some
components can cause environmental pollution.
2 Safety Instructions System Manual

9
Contact the local authorized collection point.
2.2.15 Manual Description
For user convenience, there are a large number of pictures in this manual.
These pictures are indicative only. For details about the device, refer to the
actual product you receive.
Keep this manual at a convenient place near the device for future reference
during installation, operation, maintenance, and troubleshooting of the device.
All the descriptions in this manual are based on the standard inverter, and the
actual product you receive may differ. If necessary, specify your requirements
when placing the order.
This manual may not cover all possible situations. Should a specific problem
not explained in this manual occur, contact Sungrow.
System Manual 2 Safety Instructions

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3Product Description
3.1 Overall Design of the Inverter
3.1.1 Inverter Views
VViieeww DDeessccrriippttiioonn
Front view.
Front of the inverter. A pair of doors are equipped.
Back view.
Back of the inverter. A pair of doors are equipped.
Left view
Left of the inverter. A pair of doors are equipped.
Right view
Right side of the inverter.
CCoonnttrrooll aanndd MMoonniittoorriinngg WWiinnddooww
The Control and Monitoring window is located on the front door of the inverter.
As shown in the figure below, the LED indicators are at the upper part, the color liquid
crystal (LCD) touchscreen is at the middle part, and the emergency stop button is at the
lower part.

11
The LEDs at the upper side of the Control and Monitoring Window: POWER indicates
the power-on state; OPERATION indicates the proper operation of the inverter; FAULT
indicates a fault condition.
LLEEDD IInnddiiccaattoorrss
The working status of the inverter can be acquired through these LEDs.
LLEEDD CCoolloorr DDeessccrriippttiioonn
POWER Green The control circuit power supply is supplying power.
OPERATI-
ON
White Inverter is in stop mode.
Green Inverter is in grid-connected run mode.
Yellow Inverter is in alarm run mode.
FAULT Red A fault occurs and has not been removed.
The indicator will be off when the fault is cleared.
EEMMEERRGGEENNCCYY SSTTOOPP BBuuttttoonn
When an emergency occurs, the DC and AC circuit breakers are disconnected
automatically after pressing the emergency stop button.
After the fault is removed, release the emergency stop button with the specific key, and
then manually start the inverter. Start the inverter by referring to the "7.3.3.2 Restarting
the Inverter".
TThhee MMAAIINNTTEENNAANNCCEE IINNTTEERRFFAACCEE
The cover plate of the LCD can only be opened with the key. Remove the key and store
it properly after use.
3.1.2 Mechanical Parameter
DDiimmeennssiioonnss
External dimensions are shown in the figure below.
WWiiddtthh HHeeiigghhtt DDeepptthh
2991mm 2591mm 2438mm
System Manual 3 Product Description

12
CClleeaarraannccee SSppaacceess
The clearances around the inverter should be sufficient for the doors to be opened
3.1.3 Ventilation Design
The ventilation system is designed as the cool air is drawn from the bottom of the
inverter and hot air is exhausted from the top of the inverter.
3.2 Interior Design of the Inverter
3.2.1 Internal Components
The figure below shows the top view of the major electrical components inside the
inverter:
3 Product Description System Manual