Sungrow SG3150UD-MV-US User guide

SG3150UD-MV-US/
SG4400UD-MV-USMV Grid-Connected
InverterSystem ManualSG3150_
4400UD-MV-US-SEN-Ver18-
202312M-D-000313
System Manual
MV Grid-Connected Inverter
SG3150UD-MV-US/SG4400UD-MV-US
SG3150_4400UD-MV-US-SEN-Ver18-202312

I
All Rights Reserved
All Rights Reserved
No part of this document can be reproduced in any form or by any means without the prior
written permission of Sungrow Power Supply Co., Ltd (hereinafter "SUNGROW").
Trademarks
and other Sungrow trademarks used in this manual are owned by
SUNGROW.
All other trademarks or registered trademarks mentioned in this manual are owned by their
respective owners.
Software Licenses
• It is prohibited to use data contained in firmware or software developed by SUNGROW,
in part or in full, for commercial purposes by any means.
• It is prohibited to perform reverse engineering, cracking, or any other operations that
compromise the original program design of the software developed by SUNGROW.

III
Contents
All Rights Reserved .....................................................................................................I
1 About This Manual ...........................................................................................1
1.1 Validity...........................................................................................................1
1.2 Target Group..................................................................................................1
1.3 How to Use This Manual .................................................................................1
1.4 Symbol Explanations ......................................................................................2
2 Safety Instructions ............................................................................................3
2.1 Unpacking and Inspection ...............................................................................4
2.2 Hoisting and Transportation.............................................................................5
2.3 Electrical Connection ......................................................................................5
2.4 Operation.......................................................................................................7
2.5 Operation and Maintenance ............................................................................7
2.6 Disposal ........................................................................................................9
3 Product Description ........................................................................................10
3.1 Product Introduction......................................................................................10
3.2 Product Composition ....................................................................................10
3.3 Main Internal Equipment ............................................................................... 11
3.3.1 Appearance of Inverter Unit ................................................................. 11
3.3.2 Internal Structure of Inverter Unit..........................................................12
3.3.3 Main Parts of Transformer ...................................................................13
3.3.4 Load Switch........................................................................................15
3.4 Symbol on Products......................................................................................15
4 Transport and Storage ...................................................................................17
4.1 Precautions..................................................................................................17
4.2 Transportation Requirements ........................................................................17
4.3 Storage Requirements ..................................................................................17
4.3.1 Storage Environment...........................................................................17
4.3.2 Protection During Storage....................................................................18
4.3.3 Routine Inspection for Long-term Storage .............................................18
5 Mechanical Mounting .....................................................................................19
5.1 Safety Precautions .......................................................................................19

IV
5.2 Inspection Before Installation.........................................................................20
5.2.1 Scope of Delivery................................................................................20
5.2.2 Product Inspection ..............................................................................21
5.3 Installation Environment Requirements ..........................................................21
5.3.1 Installation Site ...................................................................................21
5.3.2 Foundation .........................................................................................21
5.3.3 Installation Spacing .............................................................................22
5.4 Hoisting and Fixing .......................................................................................22
5.4.1 Preparation Before Hoisting .................................................................22
5.4.2 During Hoisting ...................................................................................23
5.4.3 Fixing.................................................................................................24
5.5 Installing Brackets ........................................................................................25
6 Electrical Connection .....................................................................................26
6.1 Precautions..................................................................................................26
6.2 Wiring Overview ...........................................................................................27
6.3 Preparation Before Wiring .............................................................................28
6.3.1 Installation Tools .................................................................................28
6.3.2 Open Product Door .............................................................................30
6.3.3 Cables ...............................................................................................30
6.3.4 Position of Cable Inlet..........................................................................31
6.3.4.1 Cable Inlet Preparation ..............................................................31
6.4 Ground Connection ......................................................................................32
6.4.1 Overview............................................................................................33
6.4.2 Grounding Flat Steel ...........................................................................33
6.4.3 Grounding Cable.................................................................................33
6.5 DC Input Connection.....................................................................................34
6.5.1 Overview............................................................................................34
6.5.2 Installing Insulation Board before Connection ........................................35
6.5.3 Procedure ..........................................................................................35
6.6 AC Side Connection .....................................................................................37
6.6.1 Inspection Before Wiring......................................................................37
6.6.2 Procedure ..........................................................................................37
6.7 Communication Connection ..........................................................................40
6.7.1 Overview............................................................................................40
6.7.2 Procedure ..........................................................................................40
6.8 Ethernet Communication...............................................................................41
6.9 External Equipment Connection.....................................................................41

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6.9.1 5KVA Power Distribution Cabinet .........................................................42
6.9.2 40KVA Power Distribution Cabinet........................................................43
6.9.3 Recommended Cables Installation ......................................................43
6.10 Check After Wiring......................................................................................44
6.10.1 Inspection ........................................................................................44
6.10.2 Locking Cabinet Door ........................................................................44
6.10.3 Fixing Cable......................................................................................45
7 Powering up and Powering down ................................................................46
7.1 Safety Instructions........................................................................................46
7.2 Powering Up Operations ...............................................................................46
7.2.1 Removing Film on Product...................................................................46
7.2.2 Removing Pressure Relief Screw .........................................................48
7.2.3 Installing Fuse in AC SPD....................................................................48
7.2.4 Adjusting De-energized Tap Changer ...................................................48
7.2.5 Opening Pressure Relief Valve.............................................................49
7.2.6 Removing Foam Part from Oil Thermometer .........................................49
7.2.7 Draining Oil from Transformer ..............................................................50
7.3 Inspection Before Powering Up......................................................................51
7.3.1 Inverter...............................................................................................51
7.3.2 PV Array.............................................................................................51
7.3.3 Checking Grid Voltage.........................................................................51
7.3.4 Transformer........................................................................................52
7.4 Powering Up Steps.......................................................................................52
7.5 Powering Down Operations ...........................................................................52
7.5.1 Planned Powering Down......................................................................52
7.5.2 Unplanned (Emergency) Powering Down..............................................53
8 O&M on WEB ..................................................................................................54
8.1 Communications Diagram .............................................................................54
8.2 Preparation Before Login ..............................................................................54
8.2.1 Login (PC) ..........................................................................................54
8.2.2 Login (Mobile Device)..........................................................................55
8.3 Login Steps..................................................................................................55
8.4 Interface Introduction ....................................................................................55
8.4.1 Homepage..........................................................................................55
8.4.2 Viewing Fault Information ....................................................................56
8.4.3 Viewing Alarm Information ...................................................................56
8.4.4 Boot/Shutdown ...................................................................................56

VI
8.4.5 Setting Initial Parameters.....................................................................56
8.4.6 Setting Operation Parameters .............................................................. 57
8.4.7 Setting System Parameters .................................................................57
8.4.8 Setting Protection Parameters..............................................................57
8.5 Modifying Password......................................................................................58
8.6 Logout .........................................................................................................58
9 Operation Mode ..............................................................................................59
9.1 Mode Change ..............................................................................................59
9.2 Operation Mode Description..........................................................................59
10 Troubleshooting ............................................................................................62
10.1 Inverter Troubleshooting .............................................................................62
10.1.1 Viewing Fault/Alarm Information .........................................................62
10.1.2 Check Method...................................................................................62
10.2 Other Faults ...............................................................................................74
11 Routine Maintenance ...................................................................................76
11.1 Safety Instructions ......................................................................................76
11.2 Maintenance Period ....................................................................................78
11.2.1 Maintenance (Once Every Three Years) ..............................................78
11.2.2 Maintenance (Every two years)...........................................................79
11.2.3 Maintenance (Once A Year)................................................................80
11.2.4 Maintenance (Every half a year to once a year)....................................81
11.3 Common Maintenance Items .......................................................................82
11.3.1 Cleaning Air Inlet of Inverter ...............................................................82
11.3.2 Cleaning Air Outlet of Inverter.............................................................83
11.3.3 Cleaning Air Inlet of Power Distribution Cabinet ...................................84
11.3.4 Cleaning Air Outlet of Power Distribution Cabinet.................................84
11.3.5 Appearance Repair............................................................................85
11.3.5.1 Erasable Traces.......................................................................85
11.3.5.2 Indelible Traces .......................................................................85
11.3.5.3 Broken Primer..........................................................................86
11.3.6 Checking Door Locks and Hinges .......................................................87
11.3.7 Checking Sealing Strips .....................................................................87
11.4 Replacing Fuse...........................................................................................87
11.4.1 Replacing DC Side Fuse ....................................................................87
11.4.2 Replacing Fuse Outside Power Distribution Cabinet.............................88
11.4.3 Replacing Fuse Inside Power Distribution Cabinet ...............................88

VII
11.5 Replacing Fans...........................................................................................89
12 Cyber Security Protocol ..............................................................................91
12.1 Password Change Requirements.................................................................91
12.2 Port Protection and Isolation........................................................................91
12.3 Network Cables and Tamper Evident Seals Inspection ..................................91
13 Cybersecurity Best Practice .......................................................................93
14 Appendix .......................................................................................................94
14.1 Technical Parameters .................................................................................94
14.2 Tightening Torques .....................................................................................96
14.3 Quality Assurance ......................................................................................96
14.4 Contact Information ....................................................................................97

1
1About This Manual
This manual describes the transportation and storage, mechanical installation, electrical
connection, power up and shutdown, web operation, troubleshooting, and maintenance of
the MV grid-connected inverter.
1.1 Validity
This manual applies to the following models:
• SG3150UD-MV-US
• SG4400UD-MV-US
This manual briefly introduce the installation and operation methods of the product.
1.2 Target Group
This manual is intended for professional technicians who are responsible for the installation,
operation, and maintenance of MV grid-connected inverters. The professional technician is
required to meet the following requirements:
• Know electronic, electrical wiring, and mechanical expertise, and be familiar with electri-
cal and mechanical schematics.
• Should be familiar with the composition and working principles of the PV system and its
front- and rear-level equipment.
• Have received professional training related to the installation and commissioning of elec-
trical equipment.
• Be able to quickly respond to hazards or emergencies that occur during installation and
commissioning.
• Be familiar with the relevant standards and specifications of the country/region where the
project is located.
1.3 How to Use This Manual
Please read this manual carefully before using the product and keep it properly at a place
for easy access.
The products and product manuals are always in the process of improvement and upgrade.
If the manual received is slightly inconsistent with the product, it may be a result of a product
version upgrade, and the actual product shall prevail. For any questions, please contact
Sungrow Customer Service.

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1.4 Symbol Explanations
To ensure the safety of the users and their properties when they use the product and to
make sure that the product is used optimally and efficiently, this manual provides users with
the relevant safety information which is marked by the following symbols. The symbols that
may be used in this manual are listed below. Please read carefully to make better use of this
manual.
DANGER indicates high-risk potential hazards that, if not avoided, may lead to
death or serious injury.
WARNING indicates moderate-risk potential hazards that, if not avoided, may lead
to death or serious injury.
CAUTION indicates a slightly hazardous situation which, if not avoided, may result
in minor or moderate injury.
NOTICE indicates potential risks that, if not avoided, may lead to device malfunc-
tions or financial losses.
NOTE indicates additional information, emphasized contents or tips to help you
solve problems or save time.
1 About This Manual System Manual

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2Safety Instructions
When installing, commissioning, operating, and maintaining the product, strictly observe the
labels on the product and the safety requirements in the manual. Incorrect operation or work
may cause:
• Injury or death to the operator or a third party.
• Damage to the product and other properties.
• Do not perform any operation on the product (including but not limited to, han-
dling, installing, powering on, or maintaining the product, performing electrical
connection, and working at heights) in harsh weather conditions, such as thun-
der and lightning, rain, snow, and Level 6 or stronger winds. SUNGROW shall
not be held liable for any damage to the device due to force majeure, such as
earthquakes, floods, volcanic eruptions, mudslides, lightning strikes, fires,
wars, armed conflicts, typhoons, hurricanes, tornadoes, and other extreme
weathers.
• In case of fire, evacuate from the building or product area and call the fire alarm.
Re-entry into the burning area is strictly prohibited under any circumstances.
• Tighten the screws with the specified torque using tools when fastening the
product and terminals. Otherwise, the product may be damaged. And the dam-
age caused is not covered by the warranty.
• Learn how to use tools correctly before using them to avoid hurting people or
damaging the device.
• Maintain the device with sufficient knowledge of this manual and use proper
tools.

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• The safety instructions in this manual are only supplements and cannot cover
all the precautions that should be followed. Perform operations considering ac-
tual onsite conditions.
• SUNGROW shall not be held liable for any damage caused by violation of gen-
eral safety operation requirements, general safety standards, or any safety in-
struction in this manual.
• When installing, operating, and maintaining the product, comply with local laws
and regulations. The safety precautions in this manual are only supplements
to local laws and regulations.
• During the product transport, installation, wiring, maintenance, etc., the materi-
als and tools prepared by users must meet the requirements of applicable local
laws and regulations, safety standards, and other specifications. SUNGROW
shall not be held liable for any damage to the product caused by the adoption
of materials and tools that fail to meet the above-mentioned requirements.
• Operations on the product, including but not limited to, handling, installing, wir-
ing, powering on, maintenance, and use of the product, must not be performed
by unqualified personnel. SUNGROW shall not be held liable for any damage
to the product resulting from operations done by unqualified personnel.
• Where the transport of the product is arranged by users, SUNGROW shall not
be held liable for any damage to the product that is caused by users them-
selves or the third-party transport service providers designated by the users.
• SUNGROW shall not be held liable for any damage to the product caused by
the negligence, intent, fault, improper operation, and other behaviors of users
or third-party organizations.
• SUNGROW shall not be held liable for any damage to the product arising from
reasons unrelated to SUNGROW.
2.1 Unpacking and Inspection
Check all safety signs, warning labels, and nameplates on products.
Ensure that the safety signs, warning labels, and nameplates are clearly visible
and not removed or covered before the product is decommissioned.
After receiving the product, check whether the appearance and structural parts of
the product are damaged, whether the transformer leaks oil, and whether the pack-
ing list is consistent with the actual ordered product. If there are problems with the
above inspection items, do not install the product and contact SUNGROW in time.
2 Safety Instructions System Manual

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2.2 Hoisting and Transportation
Risk of personal injury or device damage due to incorrect operation!
• Follow the procedure of work of heights when walking on the top of the product.
• All hoisting and transportation must comply with the relevant codes and regula-
tions of the nation/region where the project is located.
All equipment and tools used during operation must have been regularly
maintained.
Improper hoisting may cause personal injury!
• It is strictly prohibited to stand within 5m - 10m outside the operating area (i.e.,
under the boom and the hoisted machine) to avoid casualties.
• The product must be hoisted and moved by professional personnel. Before the
operation, be sure to wear personal protective equipment.
• Stop hoisting in the event of severe weather, such as heavy rain, thick fog, or
strong wind.
• When hoisting and moving the product, be aware of its size and weight and
keep the balance to prevent it from turning over or falling.
2.3 Electrical Connection
Before electrical connections, please make sure that the product is not damaged.
Otherwise, it may cause danger!
Before electrical connections, please make sure that the product switch and all
switches connected to the product are set to "OFF", and use measuring equipment
to ensure that there is no voltage at the connection. Otherwise, an electric shock
may occur!
System Manual 2 Safety Instructions

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PV modules will generate lethal high voltage when exposed to sunlight.
• Operators must wear proper personal protective equipment during electrical
connections.
• Before performing an electrical connection, be sure to disconnect the PVS and
use measuring equipment to ensure that cables are voltage-free.
• Respect the protection requirements and precautions of PV modules.
Danger to life due to a high voltage inside the inverter!
• Be sure to use special insulation tools during cable connections.
• Note and observe the warning labels on the product, and perform operations
strictly following the safety instructions.
• Respect all safety precautions listed in this manual and other pertinent
documents.
Damage to the device caused by incorrect wiring is not covered by the warranty.
• Electrical connection must be performed by professional personnel who wear
personal protective equipment.
• All cables used in the PV generation system must be firmly attached, properly
insulated, and adequately dimensioned.
Before connecting the PV module to this product, check and confirm the polarity
correctness of the PV module, and then connect it to the corresponding position of
this product.
During the installation and operation of the product, please ensure that the positive
or negative polarities of PV strings do not short-circuit to the ground. Otherwise,
an AC or DC short-circuit may occur, resulting in product damage. The damage
caused by this is not covered by the warranty.
Comply with the regulations related to the local grid during wiring.
2 Safety Instructions System Manual

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2.4 Operation
When the product is working,
• It is strictly forbidden to touch the live parts of the product. Otherwise, an elec-
tric shock may occur.
• It is strictly prohibited to disassemble any parts of the product. Otherwise, an
electric shock may occur.
• It is strictly prohibited to touch any hot parts of the product (such as the heat
sink). Otherwise, it may cause burns.
2.5 Operation and Maintenance
Risk of inverter damage or personal injury due to incorrect service!
• Before maintaining the product, be sure to disconnect the output switch of the
PVS and the load switch/disconnector of the transformer.
• After the inverter is powered off for 5 minutes, measure the voltage and current
with measuring equipment. Only when there is no voltage nor current can oper-
ators who wear protective equipment operate and maintain the inverter.
• During maintenance, be sure to check the warning labels in the product and
comply with the requirements on them.
• Even if the inverter is shut down, it may still be hot and cause burns. Operating
the inverter with protective gloves after it cools down.
The devices inside the inverter carry high voltage. Touching these devices may
lead to fatal electric shock.
• Live line measurement can only be performed by professional personnel who
know the PV system well. Before measurement, be sure to take proper protec-
tion methods (e.g., wear insulating gloves, etc.);
• During live line measurement, the operator must be accompanied by others to
ensure personal safety.
System Manual 2 Safety Instructions

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Electric shock or fire may occur due to device damage or system fault.
• Visually inspect for device damages or other hazards before the operation
• Check whether other external devices or circuit connections are in a safe state.
• Make sure the device is in a safe state before operating.
If some devices need to be replaced during operation and maintenance, please
contact SUNGROW.
Wait at least 5 minutes after the product stops running and ensure that the voltage
has dropped to within the safe voltage range, the low-voltage cabinet is connected
with the grounding cable, the transfer switch, if any, is in the grounding position,
the grounding switch, if any, is closed, and the load switch, if any, is open. After
confirming that all inspection items meet the requirements, maintain or repair the
product following the warning labels inside the product.
To avoid the risk of electric shock, do not perform any other maintenance opera-
tions beyond those described in this manual. If necessary, contact SUNGROW for
maintenance. Otherwise, the losses caused are not covered by the warranty.
If work is carried out while the device is live, insulation protection is necessary
and at least two personnel should be present at the site at the same time.
The PV plants where the inverter is located are usually located in off-city fields,
and appropriate field rescue facilities should be prepared for use in need.
To prevent misuse or accidents caused by unrelated personnel, post prominent
warning signs or demarcate safety warning areas around the device to prevent ac-
cidents caused by misuse.
2 Safety Instructions System Manual

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2.6 Disposal
Please scrap the inverter in accordance with relevant local regulations and stand-
ards to avoid property losses or casualties.
System Manual 2 Safety Instructions

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3Product Description
3.1 Product Introduction
In large and medium-sized utility power plant systems, the MV grid-connected inverter,
which contains multiple PV inverter units, transformers, and other equipment, provides a
sound solution to convert the DC power generated by PV arrays into AC power, and feed it
into the grid.
DC AC
No. Name Description
APV array Monocrystalline silicon, polycrystalline silicon, and thin
film without grounding.
B PV combiner box Combine the current of multiple PV strings and output.
CMV grid-connected
inverter
Include inverter units that convert the DC power from
the PV arrays into AC power.
Include a transformer that converts the low-voltage AC
power output by inverter units into medium-voltage AC
power.
D Grid -
3.2 Product Composition
SG4400UD-MV—US is taken as an example to introduce main devices inside the MV grid-
connected inverter. The product consists of 4 inverter units.