Sungrow SG1100UD Series Instruction Manual

SG1100UD
Series1+X Modular
InverterOperation and Maintenance
Guide1+X Modular Inverter
Operation and Maintenance Guide-
US-SEN-Ver13-202312
Operation and Maintenance Guide
1+X Modular Inverter
SG1100UD Series
1+X Modular Inverter Operation and Maintenance Guide-US-SEN-Ver13-202312

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.

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Contents
All Rights Reserved .....................................................................................................I
1 About This Manual ...........................................................................................1
1.1 Target Group..................................................................................................1
1.2 How to Use This Manual .................................................................................1
1.3 Symbol Explanations ......................................................................................1
2 Safety Instructions ............................................................................................3
2.1 Operation.......................................................................................................4
2.2 Electrical Connection ......................................................................................4
2.3 Hoisting and Transportation.............................................................................5
2.4 Operation and Maintenance ............................................................................6
2.5 Disposal ........................................................................................................7
2.6 Symbol on Products........................................................................................8
3 System Description ..........................................................................................9
3.1 Product Introduction........................................................................................9
3.2 Internal Structure of Inverter Unit .....................................................................9
4 Powering up and Powering down ................................................................ 11
4.1 Safety Instructions........................................................................................ 11
4.2 Powering Up Steps.......................................................................................12
4.3 Powering Down Operations ...........................................................................12
4.3.1 Planned Powering Down .....................................................................12
4.3.2 Unplanned (Emergency) Powering Down .............................................13
5 WEB Interface .................................................................................................14
5.1 Preparation Before Login ..............................................................................14
5.1.1 Login (PC) ..........................................................................................14
5.1.2 Login (Mobile Device)..........................................................................14
5.2 Login Steps..................................................................................................14
5.3 Boot/Shutdown.............................................................................................15
5.4 Modifying Password......................................................................................15
5.5 Logout .........................................................................................................15
6 Troubleshooting ..............................................................................................16

IV
6.1 Inverter Troubleshooting ...............................................................................16
6.1.1 Viewing Fault/Alarm Information...........................................................16
6.1.2 Check Method ....................................................................................16
6.2 Other Faults .................................................................................................28
7 Routine Maintenance .....................................................................................30
7.1 Safety Instructions........................................................................................30
7.2 Maintenance Period......................................................................................32
7.2.1 Maintenance (Once Every Three Years)................................................32
7.2.2 Maintenance (Every two years) ............................................................33
7.2.3 Maintenance (Once A Year) .................................................................34
7.2.4 Maintenance (Every half a year to once a year) .....................................35
8 Maintaining Inverter Units .............................................................................37
8.1 Installation Tools...........................................................................................37
8.2 Removing DC Side Cables............................................................................38
8.3 Remove AC Side Cables...............................................................................39
8.3.1 Removing #1/#4 Inverter Unit...............................................................39
8.3.2 Removing #2/#3 Inverter Unit...............................................................41
8.4 Remove Connections Between Inverter Units .................................................43
9 Common Maintenance Items .......................................................................46
9.1 Clean Top Air Outlet of Inverter Unit ...............................................................46
9.2 Clean Bottom Air Outlet of Inverter Unit ..........................................................47
9.3 Replace Fuse in AC SPD ..............................................................................47
9.4 Replace IGBT Module...................................................................................48
9.5 Replace Fans...............................................................................................49
9.6 Appearance Repair.......................................................................................50
9.6.1 Erasable Traces..................................................................................51
9.6.2 Indelible Traces ..................................................................................51
9.6.3 Broken Primer.....................................................................................52
9.7 Replacing DC Side Fuse ...............................................................................52
9.8 Maintenance of Other Components................................................................53
10 Appendix .......................................................................................................55
10.1 Quality Assurance ......................................................................................55
10.2 Contact Information ....................................................................................55

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1About This Manual
This manual describes the methods for stopping, troubleshooting, and daily maintenance of
the 1+X modular inverter.
1.1 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.
1.2 How to Use This Manual
Read through the manual carefully before performing any operation on the product.
The manual may be updated and revised from time to time, however, there still might be
slight deviations from the real product or errors. In such cases, the actual product you have
purchased should take precedence. You can find the latest version of the manual at sup-
port.sungrowpower.com or reach your sales for it.
1.3 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.

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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 Operation and Maintenance Guide

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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 operate the product and cables (including but not limited to moving the
product, installing the product, operating the product and cables, powering up
the product, maintaining the product, and working at heights) in harsh weather
conditions such as lightning, rain, snow, and level 6 or stronger wind.
• 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 da-
mage 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.
• 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.

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2.1 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.
2.2 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!
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.
2 Safety Instructions Operation and Maintenance Guide

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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.
2.3 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.
Operation and Maintenance Guide 2 Safety Instructions

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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.
2.4 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 op-
erators 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.
2 Safety Instructions Operation and Maintenance Guide

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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.
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.
2.5 Disposal
Please scrap the inverter in accordance with relevant local regulations and stan-
dards to avoid property losses or casualties.
Operation and Maintenance Guide 2 Safety Instructions

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2.6 Symbol on Products
Marks Explanation
High voltage inside! Risk of electric shock by touching it!
The temperature here is beyond the acceptable range for
the human body, please do not touch it arbitrarily to avoid
personal injury.
Firmly ground the protective ground terminal to ensure
the safety of operators.
The inverter can only be maintained and overhauled after
being powered off for 5 minutes.
It is recommended to wear noise-cancellation earplugs
since the product may generate noise during operation.
It is strictly forbidden to touch the fan blades when the fan
is rotating.
Read this manual carefully before any operation on the
product.
Do not dispose of this product as household waste.
2 Safety Instructions Operation and Maintenance Guide

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3System 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 Internal Structure of Inverter Unit
Open the front door of the inverter unit cabinet to see the DC cabinet, as shown in the left
figure below. Open the back door of the inverter unit cabinet to see the AC cabinet, as
shown in the right figure below.

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* The figure is for reference only. And the actual product received shall prevail.
No. Name Description
AMaintenance switch QS2 Disconnect it before maintenance and repair.
BDC load switch QS1 Control the on/off of the DC side circuits of the
inverter.
C DC fuse -
DDC wiring copper bar -
E Fuse of AC side SPD -
FAC circuit breaker QF1 Control the on/off of the AC side circuits of the
inverter.
GAC wiring copper bar —
Maintenance switch QS2 could also be located at the bottom left corner of the AC
side. The real product may differ.
3 System Description Operation and Maintenance Guide

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4Powering up and Powering down
4.1 Safety Instructions
High voltage! Electric shock!
• Wear proper protection equipment before all operations on the device.
• Do not touch the live terminals or conductors.
• Respect all safety instructions attached on the device and described in this
manual.
• Respect all safety instructions prescribed by the manufacturer of devices con-
nected to the inverter.
Grid-connection of the inverter can be performed only after receiving approval
from the local utility grid company and by qualified personnel.
When the inverter is operating, make sure there are no flammable materials within
at least 5m around the installation site.
Local/national standards about the min. electric clearance around the inverter
should be respected.
Make sure the installation is correct and no spare parts or tools are left inside the
device.
Close the doors of the inverter and the internal devices if the commissioning pro-
cess is stopped.

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4.2 Powering Up Steps
Step 1 Turn on the maintenance switch QS2 of all inverter units and the external power supply
equipment switch (which is, the QS4 switch inside the power distribution cabinet). Then,
close the door.
Step 2 Turn on the load switch of the transformer, and close the door.
Step 3 Send a shutdown command through the WEB to shut down the inverter.
Step 4 Check and ensure that the “Access Protection Enabling” switch is off on the WEB page.
Step 5 Turn on the output switch of the upstream PVS/trunk bus.
Step 6 Set the DC knob switch to the “ON” position.
Step 7 Turn on the DC load switch QS1 inside all inverter units.
Step 8 Start up the inverter on the WEB page, and the inverter begins to work in the grid-connected
state.
For the positions of the above switches, please see "3.2 Internal Structure of
Inverter Unit"and "5 WEB Interface".
- - End
4.3 Powering Down Operations
4.3.1 Planned Powering Down
Step 1 Send a shutdown command through the WEB to shut down the inverter.
Step 2 Turn the DC knob switch to the “OFF” position.
Step 3 Turn off the output switch of the upstream PVS/trunk bus.
Step 4 Turn off the load switch of the transformer.
Step 5 Check and ensure that the DC side load switches QS1 of all inverter units are turned off.
Step 6 Turn off the maintenance switches QS2 of all inverter units.
Step 7 Check and ensure that the AC circuit breakers QF1 of all inverter units are open.
Step 8 Open the power distribution cabinet, and turn off the external power supply equipment switch
(which is, the QS4 switch inside the power distribution cabinet).
For the positions of the above switches, please see "3.2 Internal Structure of
Inverter Unit"and "5 WEB Interface".
- - End
4 Powering up and Powering down Operation and Maintenance Guide

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4.3.2 Unplanned (Emergency) Powering Down
Step 1 Press the emergency stop button on the DC side.
Upon pressing the emergency stop button, only the AC circuit breaker and DC load
switch will open. The internal auxiliary power supply and PCB board will still carry
voltage. Do not touch them!
Step 2 Turn the DC knob switch to the “OFF” position.
Step 3 Turn off the output switch of the upstream PVS/trunk bus.
Step 4 Turn off the load switch of the inverter.
Step 5 Check and ensure that the DC side load switches QS1 of all inverter units are turned off.
Step 6 Check and ensure that the maintenance switches QS2 of all inverter units are turned off.
Step 7 Check and ensure that the AC circuit breakers QF1 of all inverter units are open.
Step 8 Turn off the external power supply equipment switch (which is, the QS4 switch inside the
power distribution cabinet).
For the positions of the above switches, please see "3.2 Internal Structure of
Inverter Unit".
- - End
Operation and Maintenance Guide 4 Powering up and Powering down

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5WEB Interface
5.1 Preparation Before Login
5.1.1 Login (PC)
Step 1 To connect the PC to the product, connect the network cable to the network port of the PMD
switch.
Step 2 Configure the IP address of the PC. Set the IP address of the PC to the same network seg-
ment as the NET1 address of the smart unit board.
Default IP address of the NET1 port: 12.12.12.12.
Default IP address of the NET2 port: 14.14.14.14.
- - End
5.1.2 Login (Mobile Device)
Step 1 Enable WiFi on the mobile device (such as a mobile phone), search for the hotspot, such as
SG-xxx (xxx represents the device SN), and enter the password. The password is
ESPWifi@123.
Step 2 Open a browser on the mobile phone and enter the address (11.11.11.1) or domain (sungrow.
net) to access the WEB interface.
- - End
5.2 Login Steps
Step 1 Enter the server address to enter the homepage as a visitor by default.
PC:
• NET1 port, URL: 12.12.12.12.
• NET2 port, URL: 14.14.14.14.
Mobile device:
URL:11.11.11.1.
Step 2 Click and select the desired language in the upper right corner of the interface.
Step 3 Click to enter the login interface.