Sungrow SG3425UD User guide

SG3425UD/
SG3600UDOutdoor InverterSystem
ManualSG3425UD_3600UD-SEN-
Ver14-202208M-H-002150
System Manual
Outdoor Inverter
SG3425UD/SG3600UD
SG3425UD_3600UD-SEN-Ver14-202208

I
Contents
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 Internal Devices of the Inverter.............................................................13
3.2.3 Operations on the DC and AC Side ......................................................14
4 Delivery ............................................................................................................17
4.1 Scope of Delivery .........................................................................................17
4.2 Identifying the Inverter ..................................................................................18
4.3 Checking for Transport Damages...................................................................18
4.4 Storage of the Inverter ..................................................................................18
5 Mechanical Installation ..................................................................................20
5.1 Transport .....................................................................................................20
5.2 Hoisting the Inverter......................................................................................22
5.2.1 Safety Precautions..............................................................................22
5.2.2 Hoisting..............................................................................................23
5.2.3 Fastening of Connectors......................................................................25
5.3 Foundation...................................................................................................25
5.3.1 Selection of Installation Site .................................................................25
5.3.2 Foundation Requirements....................................................................25
5.3.3 Recommended Foundation Construction Plan.......................................26
5.3.4 Other Precautions ...............................................................................27
5.4 Removing the Sealing Tapes .........................................................................28
5.5 Clearance Requirement ................................................................................28
6 Electrical Installation ......................................................................................29
6.1 Safety Instructions........................................................................................29
6.1.1 Generals Rules...................................................................................29
6.2 Preparation before Electrical Connections ......................................................31
6.2.1 Installation Tools .................................................................................31
6.2.2 Opening the Inverter Door....................................................................32
6.2.3 Opening the Cable Entries ...................................................................33
6.2.4 Checking the Cables ...........................................................................34
6.2.5 During Connection ..............................................................................34
6.3 Circuit Diagram and Cable Connection...........................................................34
6.3.1 Circuit Diagram...................................................................................34
6.3.2 Cable Specifications............................................................................35
6.4 DC Connection.............................................................................................35
6.4.1 Checking before Connection ................................................................ 35
6.4.2 DC Cable Connection..........................................................................35

III
6.5 AC Connection .............................................................................................39
6.5.1 Safety Notices ....................................................................................39
6.5.2 AC Connection Area on the Side ..........................................................39
6.5.3 AC Connection Area at the Bottom .......................................................40
6.6 Communication Connection ..........................................................................43
6.7 Ground Connection ......................................................................................43
6.8 Finishing Electrical Connection ......................................................................44
6.9 Closing the Inverter Door ..............................................................................46
7 Commissioning ...............................................................................................47
7.1 Safety Instructions........................................................................................47
7.2 Requirements of Commissioning ...................................................................47
7.3 Checking before Commissioning ...................................................................48
7.3.1 Checking the Cable Connection ...........................................................48
7.3.2 Checking the Inverter Switches ............................................................48
7.3.3 Checking PV Array ..............................................................................48
7.3.4 Checking Grid Voltage.........................................................................49
7.4 Preparation before Starting ...........................................................................49
7.5 LCD Parameter Setting .................................................................................50
7.6 Completing Commissioning...........................................................................50
8 Starting/Stopping ............................................................................................51
8.1 Starting........................................................................................................51
8.1.1 Inspection before starting.....................................................................51
8.1.2 Start Steps .........................................................................................51
8.2 Stopping ......................................................................................................52
8.2.1 Normal Stop .......................................................................................52
8.2.2 Stop in Case of Fault ...........................................................................52
9 LCD Menu Operation .....................................................................................54
9.1 LCD TouchScreen ........................................................................................54
9.2 Default Screen .............................................................................................54
9.2.1 Initialization ........................................................................................54
9.2.2 Default Screen Introduction..................................................................54
9.2.3 Backlight and Screensaver ..................................................................55
9.3 Overview of LCD Menu and Icon....................................................................55
9.3.1 Overview of Submenu and Icon............................................................55
9.3.2 Layout of the submenus.......................................................................56
9.4 Entering Password .......................................................................................57

IV
9.5 Language Setting .........................................................................................58
9.5.1 Conventional Way...............................................................................58
9.5.2 Shortcut .............................................................................................58
9.6 Setting Date and Time ..................................................................................58
9.7 Checking Running Information ......................................................................59
9.8 Checking History Information ........................................................................59
9.8.1 Checking History Event .......................................................................59
9.8.2 Checking History Data ........................................................................60
9.8.3 Checking History Fault ........................................................................60
9.8.4 Checking History Alarm ......................................................................60
9.9 Checking Present Fault Information ..............................................................60
9.10 Starting/Stopping........................................................................................61
9.11 Loading Default ..........................................................................................61
9.12 Checking Firmware Version ........................................................................62
9.13 Parameters of LCD .....................................................................................62
9.13.1 Communication Parameters...............................................................62
9.13.2 Running Parameters .........................................................................63
9.13.3 Protection Parameter.........................................................................63
10 Main Functions .............................................................................................64
10.1 Operation Mode..........................................................................................64
10.1.1 Mode Change ...................................................................................64
10.1.2 Operation Mode Description...............................................................64
10.2 Active Power Limitation...............................................................................66
10.2.1 Introduction to Active Power Limitation................................................66
10.2.2 How to Realize Power Limitation ........................................................66
10.3 Reactive Power Adjustment ........................................................................66
10.4 Low Voltage Ride Through (LVRT) ...............................................................67
10.5 High Voltage Ride Through (HVRT)..............................................................68
10.6 MPPT ........................................................................................................69
10.7 Intelligent Temperature-Control Technology ..................................................69
10.8 Insulation Monitoring Function .....................................................................70
10.8.1 Introduction.......................................................................................70
10.8.2 Simple Troubleshooting .....................................................................70
10.9 Protection Function.....................................................................................70
10.9.1 DC Over-voltage Protection ...............................................................70
10.9.2 AC Over/under-voltage Protection ......................................................70
10.9.3 Frequency Anomaly Protection...........................................................71

V
10.9.4 Islanding Protection...........................................................................71
10.9.5 Overload Protection...........................................................................71
10.9.6 Ground Protection .............................................................................71
10.9.7 Module Over-temperature Protection ..................................................71
10.9.8 Internal Over-temperature Protection ..................................................71
11 Troubleshooting ............................................................................................72
11.1 Safety Instructions ......................................................................................72
11.2 Checking Fault ...........................................................................................72
11.3 Fault and Troubleshooting on the Inverter .....................................................73
11.4 Other Fault and Troubleshooting ..................................................................84
12 Routine Maintenance ..................................................................................85
12.1 Overview....................................................................................................85
12.2 Safety Instructions ......................................................................................85
12.3 Maintenance ..............................................................................................86
12.3.1 Overview ..........................................................................................86
12.3.2 Introduction.......................................................................................86
12.3.3 Maintenance Interval .........................................................................86
12.4 Cleaning the Inverter...................................................................................90
12.4.1 Introduction.......................................................................................90
12.4.2 Cleaning Interval ...............................................................................91
12.4.3 Cleaning the Internal Dust..................................................................91
12.4.4 Cleaning the Foundation....................................................................91
12.4.5 Checking and Cleaning the Air Inlets/outlets........................................91
12.4.6 Cleaning the Surface of the Inverter....................................................92
12.4.7 Checking the Lock and Hinge.............................................................92
12.4.8 Checking the Sealing Strip .................................................................92
12.5 Painting Make-up Measures ........................................................................92
12.6 Replacing the Electrical Components ...........................................................96
12.6.1 Safety Instructions.............................................................................96
12.6.2 Replacing DC Fuses..........................................................................96
13 Appendix .......................................................................................................98
13.1 System Parameters ....................................................................................98
13.2 Tightening Torques .....................................................................................99
13.3 Exclusion of Liability..................................................................................100
13.4 Contact Information ..................................................................................100

1
1About This Manual
1.1 Validity
This manual is intended for the following product:
• SG3425UD
• SG3600UD
1.2 Content
This manual contains the following information:
Content Description
Safety
instruction
Safety instructions on the installation, operation, maintenance, and
troubleshooting of the inverter
Product
Description The appearance and internal components of the inverter
Delivery Delivery and inspection after receiving the inverter
Installation Mechanical transport, installation, and electrical connection of the
inverter
Commissioning Safety notices and commissioning process when the inverter is
powered on for the first time
Start/Stop Steps of starting and stopping the inverter internal devices during
normal maintenance or troubleshooting
Operation on
LCD Display Function and use of the inverter user interface
Functions Descriptions of the inverter main functions
Troubleshooting Simple troubleshooting of the inverter
Daily operation Instructions on and guides to the daily operation of the inverter
1.3 Target Group
This manual is for technical personnel who are responsible for the transport, installation and
other operations on the inverter. Only qualified personnel can perform the installation,
maintenance, and troubleshooting. Unauthorized persons should not perform any operation
on the inverter and should be away from the inverter to avoid potential hazards. Qualified
personnel are:

2
• 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 inverter 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.
NOTE indicates additional information, emphasized contents or tips to help you
solve problems or save time.
1 About This Manual System Manual

3
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.
Symbol Explanation
Lethal voltage inside! Do not touch!
Hot surface! Do not touch the hot surface of the device.
After the inverter is disconnected, you need to wait 5 minutes
before touching the internal conductive devices.
Protective earth. Earthing securely to ensure personal safety.
When working on the device, wear hearing protection.
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
Name For short
Inverter Inverter
Module unit/ Inverter unit Module
The foregoing devices are expressed in the abbreviation form in this document unless
otherwise specified.
System Manual 1 About This Manual

4
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.
No. Name
A PV array
B PV array combiner box
C Inverter
D Transformer
E Utility 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 5 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.
Contact the local authorized collection point.
2 Safety Instructions System Manual

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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
Control and Monitoring Window
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.
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.
LED Indicators
The working status of the inverter can be acquired through these LEDs.

11
LED Color Description
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.
Buttons
The functions of each button are shown in the table below.
Button Description
DC Turn this knob switch to disconnect/connect the DC switch
EMERGENCY STOP When an emergency occurs, the DC load break switches and AC
circuit breakers disconnect automatically after pressing the
emergency stop button.
The MAINTENANCE INTERFACE
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
Dimensions
External dimensions are shown in the figure below.
Clearance Spaces
The clearances around the inverter should be sufficient for the doors to be opened
System Manual 3 Product Description

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3.1.3 Ventilation Design
The ventilation system is designed as the cool air is drawn from the top of the inverter and
hot air is exhausted from the bottom 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