Sungrow SG1250UD User manual

SG1250UD_1500UD-V13-OEN-Ver11-201807
SG1250UD/SG1500UD
Outdoor Central Inverter
Operation Manual

I
Contents
1About This Manual....................................................................1
1.1 Preface........................................................................................................1
1.2 Validity .........................................................................................................1
1.3 Brief Introduction .........................................................................................1
1.4 Target Group................................................................................................1
1.5 How to Use This Manual .............................................................................2
1.6 Symbol Explanation.....................................................................................2
2Safety Instructions ...................................................................4
2.1 Intended Use...............................................................................................4
2.2 Safety Use Description................................................................................4
2.3 Operation Precautions.................................................................................5
2.3.1 Manual Storage...................................................................................5
2.3.2 Staff Requirements..............................................................................5
2.3.3 Labels on the Inverter .........................................................................6
2.3.4 Warning Label Setting.........................................................................6
2.3.5 Emergency Escape Route ..................................................................6
2.3.6 PV Array Protection.............................................................................6
2.3.7 Live Line Measurement.......................................................................6
2.3.8 Measuring Instrument .........................................................................6
2.3.9 LCD Parameter Setting.......................................................................7
2.3.10 ESD Protection..................................................................................7
2.3.11 Moisture Protection...........................................................................7
2.3.12 Maintenance and Service .................................................................7
2.3.13 Disposal of Waste.............................................................................8
2.3.14 Others ...............................................................................................8
3Product Description .................................................................9
3.1 Inverter Appearance....................................................................................9
3.1.1 Appearance.........................................................................................9
3.1.2 LED Indicators.....................................................................................9
3.1.3 LCD Touchscreen..............................................................................10
3.1.4 Emergency Stop Button ....................................................................10
3.1.5 Start/Stop Switch...............................................................................11

II
3.2 Communication System.............................................................................11
3.2.1 RS485 Communication.....................................................................11
3.2.2 Ethernet.............................................................................................11
4Start & Stop ............................................................................ 13
4.1 Starting...................................................................................................... 13
4.1.1 Inspection Before Starting................................................................ 13
4.1.2 Starting Steps................................................................................... 13
4.2 Stopping.................................................................................................... 14
4.2.1 Normal Stopping............................................................................... 14
4.2.2 Stopping in Case of Fault................................................................. 14
5Operating Mode...................................................................... 16
5.1 Mode Switching ........................................................................................ 16
5.2 Mode Description...................................................................................... 16
6LCD Menu Operation............................................................. 19
6.1 LCD Touchscreen..................................................................................... 19
6.2 Default Screen.......................................................................................... 19
6.2.1 Default Screen Introduction.............................................................. 19
6.2.2 Backlight and Screensaver .............................................................. 20
6.3 Overview of LCD Menu and Icon ............................................................. 20
6.3.1 Overview of Submenu and Icon....................................................... 20
6.3.2 Layout of the submenus................................................................... 20
6.4 Entering Password ................................................................................... 21
6.5 Language Setting ..................................................................................... 22
6.6 Date and Time Setting.............................................................................. 22
6.7 Real-time Data Checking.......................................................................... 22
6.8 Power Yields Checking............................................................................. 23
6.9 History Information Checking ................................................................... 25
6.10 History Record Checking................................................................ 25
6.11 Present Fault Information Checking............................................... 26
6.12 Starting/Stopping the Inverter ......................................................... 26
6.13 Energy Output Deviation Adjustment.............................................. 26
6.14 Load Default ................................................................................... 27
6.15 Firmware Version Checking............................................................ 27
7Parameters of LCD................................................................. 29
7.1 Communication Parameters..................................................................... 29
7.1.1 RS485 Serial Port Parameter Setting .............................................. 29
7.1.2 Ethernet Parameter Setting.............................................................. 29

III
7.2 Running Parameters .................................................................................30
7.3 Protection Parameter ................................................................................34
8Inverter Functions ..................................................................39
8.1 Perfect Control Strategy............................................................................39
8.2 Active Power Limitation.............................................................................39
8.2.1 Active Power Limitation Introduction.................................................39
8.2.2 How to Realize Power Limitation ......................................................40
8.3 Reactive Power Adjustment ......................................................................40
8.4 Low Voltage Ride Through........................................................................41
8.5 High Voltage Ride Through .......................................................................42
8.6 Over-frequency Derating Function............................................................43
8.7 Temperature Derating................................................................................43
8.8 Maximum Power Point Tracking................................................................44
8.9 Intelligent Temperature-Control Technology..............................................45
8.10 Anti-PID Effect Function (Optional) .................................................45
8.10.1 Introduction to PID Effect................................................................45
8.10.2 PID Power Supply Mode Function Setting......................................45
8.10.3 PID Repair.......................................................................................46
8.11 Insulation Monitoring Function.........................................................46
8.11.1 Introduction .....................................................................................46
8.11.2 Simple Troubleshooting ..................................................................46
8.12 Grid Self-Establishment and Debugging .........................................47
8.13 Deep Standby Function ...................................................................47
8.14 Protection Function..........................................................................47
9Routine Maintenance..............................................................50
9.1 Safety Instructions.....................................................................................50
9.1.1 Safety Rules......................................................................................50
9.1.2 Five Safety Rules..............................................................................50
9.2 Maintenance and Interval..........................................................................50
9.3 Filter Checking and Cleaning....................................................................52
9.4 Replacement of the Electrical Components..............................................53
10 Troubleshooting......................................................................54
10.1 Fault Checking.................................................................................54
10.2 Fault and Troubleshooting of LED...................................................55
10.3 Fault and Troubleshooting on the LCD screen................................55
10.4 LCD Display Alarm Information and Troubleshooting .....................58
10.5 Other Faults.....................................................................................61

IV
11 Appendix ................................................................................ 62
11.1 Technical Parameters..................................................................... 62
11.2 Exclusion of Liability ....................................................................... 64
11.3 Contact Information ........................................................................ 64

1
1 About This Manual
1.1 Preface
Dear customers, thank you for using the outdoor central inverter developed and
manufactured by Sungrow Power Supply Co. Ltd. We sincerely hope that this product can
meet your needs and welcome any comments on the performance and functions of the
product. Your feedback helps us continue to improve the quality of our products.
1.2 Validity
This manual is valid for the following device types:
SG1250UD
SG1500UD
For ease of description, the foregoing products are referred to as "the inverter" hereinafter.
1.3 Brief Introduction
This manual is valid for the outdoor central inverters SG1250UD/SG1500UD (referred to as
the inverter hereinafter) and contains the following information:
Safety instructions
Describes the safety precautions on the operation and maintenance of the inverter.
Product description
Describes the composition, structure, functions, and operation modes of the inverter.
Use
Introduces the inverter operations and use of HMI
Routine maintenance
Introduces the daily maintenance of the inverter and the replacement of the accessories.
Troubleshooting
Introduces the potential faults and troubleshooting of the inverter.
Others
Introduces the technical data of the inverter, exclusion of liability, and contact information.
1.4 Target Group
This manual is intended for persons who perform operation and maintenance on the

1 About This Manual Operation Manual
2
inverter. Readers should have certain electrical knowledge and familiar with electrical
principles and electrical components.
1.5 How to Use This Manual
Read this manual and other related documents carefully before any work on the inverter.
Documents must be stored carefully and available at all times. Additional documents are
also available to the users:
Installation Manual (in the scope of delivery)
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.
For user convenience, there are a large number of pictures in this manual.
These pictures are indicative only. For details about the device, please refer to
the actual product you receive.
1.6 Symbol Explanation
This manual contains important safety and operational instructions that must be accurately
understood and followed during the installation and maintenance of the equipment.
To ensure optimum use of this manual, note the following explanations of 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.

Operation Manual 1 About This Manual
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Always beware of the warning symbols on the device, including:
Symbols
Explanations
Risk of electric shock!
Hot surface!
Connection point for earth conductor
Protective conductor terminal

4
2 Safety Instructions
2.1 Intended Use
The outdoor central inverter developed and manufactured by Sungrow converters the DC
current from the PV array into the AC current. The AC current can be fed into the MV grid
after processed by external boosting transformer. With the ingress of protection IP54, the
inverter can be installed outdoors.
The external transformer boosts the voltage output from the inverter to the grid-compatible
voltage, so that the inverter is connected to the grid. For specific transformer technical
requirements, refer to the Connection Requirements for Medium-voltage Transformers.
An example of intended usage of the inverter is shown below.
ABCDE
Fig. 2-1 PV grid-connected power generation system
Item
Name
A
PV array
B
Combiner box
C
Inverter
D
Boosting transformer
E
Utility grid
Install the inverter as described in this section and do not install or alter the
inverter without authentication. Otherwise, safety accidents or device damage
can be caused. Sungrow shall hold no liability for the consequences.
2.2 Safety Use Description
Read the safety instructions carefully before installing the inverter. Refer to corresponding
manuals for the safety instructions on the internal devices.
Shock Hazard!
Death resulting from burns and electric shock upon touching the inverter live
components.
Do not touch the live components of the inverter or the utility grid.
Observe all safety regulations.

Operation Manual 2 Safety Instructions
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The enclosure of the inverter may contain high voltage conductors. To avoid the
risk of electric shock,
do not perform any action or operation which is not included in the operating
instructions unless you are qualified to do so; and
disconnect the inverter completely and wait until the device is de-energized,
before working on it, and ensure that the device will not be accidentally
energized.
Lethal Voltage!
Damage to the inverter may result in death by electric shock or fire! Only work on
the inverter, when
it is safe to do so; and
no damage is visibly apparent!
After maintenance and service work to the inverter, power on the inverter
following the procedures described in this manual.
2.3 Operation Precautions
2.3.1 Manual Storage
Manuals are indispensable parts of the product.
Important information about operations on the inverter is included in this manual. Read this
manual carefully before performing any operations.
Operate the inverter strictly following the description in this manual. Otherwise, device
damage, personal injury or death, and property loss can be caused.
Keep this manual properly to ensure that it is available at all times.
After operation or maintenance, no manual or paper should be left inside the inverter
cabinet.
2.3.2 Staff Requirements
Only professional electricians or qualified persons can perform operations on the
product.
The operators should be familiar with the whole PV power generation system and
operating principles.
The operators should be familiar with the Installation Manual and Operation Manual of
the product.
The operators should be familiar with the national/local standards and regulations.

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2.3.3 Labels on the Inverter
Warning symbols on the inverter enclosure and in its interior contain important safety
information. Do not tear or damage them!
Nameplates located in the back panel and inner side of the front door include important
parameter information on the product. Do not tear or damage them!
Ensure that the labels on the device are clear at all times.
Immediately replace the damaged or blurred labels.
2.3.4 Warning Label Setting
To avoid accidents caused by unauthorized persons, respect the followings during
installation, routine maintenance or troubleshooting of the inverter:
Place eye-catching warning labels on upstream and downstream switches of the
inverter to avoid accidents due to inadvertent reconnection.
Place warning boards or safety warning tape around the operation area.
Remove the keys and keep them properly after maintenance or troubleshooting.
2.3.5 Emergency Escape Route
To ensure personal safety in case of accidents, respect the following requirements:
Ensure that the escape route is freely accessible throughout any operation process.
Never block or lock the emergency route.
2.3.6 PV Array Protection
Voltage is present between positive and negative polarities once the PV arrays are
exposed to sunlight. The voltage is extremely high for a large scale PV plant. Electrical
shock or even death can result from inadvertent touching.
High voltages are present between the positive and negative polarities of the PV
arrays!
Ensure the inverter has been disconnected from the PV array.
Place an eye-catching warning label at the disconnection point, to avoid
inadvertent reconnection.
2.3.7 Live Line Measurement
Lethal electrical shock from inadvertent touch due to high voltage present in the
device. During live line measurement,
Take protection measures (for example, wear insulation gloves)
Accompanied by someone else to ensure personal safety.
2.3.8 Measuring Instrument
During electrical connection, commissioning, or the like, use related electrical measuring
instrument to ensure that the electrical parameters meet requirements.

Operation Manual 2 Safety Instructions
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Use high-quality measurement devices that meet the on-site requirements.
Ensure that the measuring instrument is correctly connected and used to avoid
the electrical arc and other hazards.
2.3.9 LCD Parameter Setting
Some settable parameters on the LCD are closely related to the operation of the inverter.
Therefore, these parameters can only be set after reliable evaluation of the system and
inverter
Inappropriate parameter setting may impair the functionality of the inverter!
Only authorized qualified persons can set the parameters.
2.3.10 ESD Protection
The components can be damaged due to touching the PCB or other components
sensitive to ESD or performing incorrect operations.
Avoid unnecessary touch to the PCB.
Respect the ESD protection standards, for example, wear a wrist strap.
2.3.11 Moisture Protection
Moisture penetration may damage the inverter!
Do not open the inverter door when the relative humidity is above 95%.
Do not service or maintain the device in rainy or damp days.
2.3.12 Maintenance and Service
Wait at least 15 minutes after the inverter stops to maintain or service the inverter.
Before any service work, observe the following procedures:
Ensure that the inverter cannot be powered on inadvertently.
Ensure that the interior of the inverter is completely voltage-free by using a multimeter.
Perform necessary grounding and short circuit connection.
Use the insulation clothing to cover and insulate the possible live components adjacent
to the operation area.
Ensure that the emergency escape route is freely-accessible throughout the operation
process.

2 Safety Instructions Operation Manual
8
Cable connection terminal corresponding to the self-powered circuit breaker Q1
of the inverter still carry voltages when the AC side of the inverter is connected to
the grid and the following operations are performed:
Press down the emergency stop button
Disconnect the AC circuit breaker of the inverter
Disconnect the switch of the boosting transformer during troubleshooting to
ensure personal safety.
2.3.13 Disposal of Waste
When the inverter is on the end of its service life, it cannot be disposed of as household
wastes. Please contact the local authorized collection point.
2.3.14 Others
The inverter must be operated according to national/local standards or
regulations.
Only service the device when it is voltage-free!
At least two persons are required for maintenance or troubleshooting. Do not
perform operations until the device is discharged completely.
Take the following protection or emergency measures according to onsite requirements:
Wear suitable protective equipment (for example safety goggles, earplugs, dielectric
gloves, insulating shoes) when maintaining or servicing the device.
The inverter is generally installed in places far away from the urban, and therefore, take
corresponding emergency aid measures according to requirements.
Take necessary auxiliary measures to ensure personal and device safety.
The inverter described in this manual is of standard configuration. If necessary,
specify your requirements when placing an order. For product details, refer to
the actually received device.
This manual cannot cover all possible conditions during operation,
maintenance, and troubleshooting. For any problems not described in this
manual, please contact Sugrow promptly.

9
3 Product Description
3.1 Inverter Appearance
3.1.1 Appearance
The face and main external components of the inverter are shown in the figure below.
A
E
B
C
D
E
E
Note: The figure takes the standard inverter appearance as an example, and the actual
product may differ.
Item
Name
Description
A
LED indicator
Separately, power indicator "POWER", operation
indicator "OPERATION", and fault indicator "FAULT"
B
LCD touchscreen
Displays the data and execute control commands
C
Emergency stop button
Can be used to disconnect the AC side power supply
immediately in case of emergency
D
Start/Stop button
Used to start/stop the inverter
E
Lock
A total of three, used to open and close the front doors of
the inverter
In addition to the standard configuration, DC/AC meter is optional. The meter can be
an energy meter or voltage meter. Specifically, refer to the actually received device.
3.1.2 LED Indicators
There are three LED indicators at the upper side of the inverter AC cabinet: POWER,
OPERATION, and FAULT.
These indicators indicate operation status of the inverter. Description of these LED
indicators is as follows.
LED
Color
Description
POWER
Green
The control circuit power supply is supplying power.
OPERATION
White
Inverter is in stop mode.
Green
Inverter is in feed-in operation mode.
Yellow
Inverter is in alarm run mode*.
FAULT
Red
A fault occurs and has not been removed.
The LED will be off when the fault is cleared.

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Possible LED combinations and the meaning are listed in the following table:
LED status
Description
POWER OPERATION FAULT
All the three indicators
are on
POWER OPERATION FAULT
POWER OPERATION FAULT
“POWER”is on
POWER OPERATION FAULT
POWER OPERATION FAULT
“POWER”is on
“OPERATION”is green
POWER OPERATION FAULT
POWER OPERATION FAULT
“POWER”is on
“OPERATION”is
yellow
POWER OPERATION FAULT
POWER OPERATION FAULT
“POWER”is on
“FAULT”is on
POWER OPERATION FAULT
POWER OPERATION FAULT
All LEDs are off
POWER OPERATION FAULT
3.1.3 LCD Touchscreen
The LCD touchscreen can display inverter running information, and users can use it to
implement the following functions:
Start or stop the inverter
Display real-time operating data
Display current faults and fault records
Adjust the running parameters
View history records
3.1.4 Emergency Stop Button
The inverter will be disconnected from the external power supply immediately when the
emergency stop button is pressed down.
Electrical shock hazards!
The pressing of the emergency stop button in no way implies that no voltage is
present in the electrical connection terminals inside the inverter.
Lethal voltages are present inside the inverter.
Use the emergency stop button to stop the inverter only in a time of crisis.
Improper or frequent use of the emergency stop button may lead to inverter
damages. Pressing the button with current carrying will lay great stress to the
pertinent parts of the inverter.
When you push this button, the inverter will disconnect immediately from the power module
and the button will be locked. You can restart the inverter by rotating the button clockwise to
unlock it. The inverter will be restarted when the AC and DC side grid connection
requirements are met.

Operation Manual 3 Product Description
11
3.1.5 Start/Stop Switch
The inverter can only start when the start/stop switch is put in the “start” position.
When you put the switch in the "stop" position, the inverter will stop through a stop
command sent to the control DSP.
3.2 Communication System
3.2.1 RS485 Communication
Logger
The inverter can communicate with Logger via the RS485 standard serial port. Logger
can monitor the communication of single or multiple inverters.
33 3
Inverter
Logger
Fig. 3-1 Logger Collects Data through RS485
PC
Inverter communicates with PC via RS485/RS232 converter. Insight is used to monitor
the communication of single or multiple inverters.
Inverter
33 3
RS485/232 Converter
PC
Fig. 3-2 PC collects data through RS485 Bus
Logger + PC
One or more inverters communicate with PC via Logger. Insight is used to monitor the
communication.
Inverter
33 3
Logger
PC
Fig. 3-3 Logger & PC Collect Data through RS485 Bus
3.2.2 Ethernet
The inverter provides the Ethernet communication as standard configuration.
Single inverter communication
If there is only one inverter, you can connect the RJ45 port of the inverter to the RJ45 port
of the PC directly. Insight is used to monitor the communication.

3 Product Description Operation Manual
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Inverter
3
PC
Fig. 3-4 Ethernet communication of one inverter
Multiple inverters communication
If there is more than one inverter, the Ethernet switch is required for communication.
Insight is used to monitor the communication.
Ethernet Switch
Inverter
3
3
3
PC
Fig. 3-5 Ethernet communication of multiple inverters
The details of Logger and Insight can be obtained by visiting the website at
www.sungrowpower.com. Download the latest product information when
necessary.

13
4 Start & Stop
4.1 Starting
4.1.1 Inspection Before Starting
After maintenance or troubleshooting, the inverter needs to be started. Check the
following items before starting the devices:All connections are done by strictly following
the installation manual and circuit diagram.
The coverings of the internal devices are fixed and secured.
The cabinet door is closed.
The emergency stop button is released and the Start/Stop switch is in the "Stop"
position.
Turn theAC Switch and the DC Switch to the "OFF" position.
Make sure, via suitable instruments, that there is no ground fault of the PV modules.
Measure the DC andAC current with multimeter to check if they fulfill the inverter
startup conditions and there is no overvoltage hazard.
After longtime storage, a thorough and professional test is necessary before
starting the inverter.
4.1.2 Starting Steps
When the abovementioned conditions are fulfilled, proceed as follows to start the inverter:
Step 1Open the inverter cabinet door, close the AC switch, and close the cabinet door.
Step 2Connect all inverter upstream switches.
Step 3Open the inverter cabinet door, turn the DC Main Switch to the "ON" position, and close the
cabinet door (close all the 16 DC switches in turns even if there are less than 16 inputs
connected to the DC cabinet on site).
Step 4Turn the Start/Stop switch to the "START" position.
Step 5Inverter starts.
After startup, the inverter will automatically check if parameters of the DC and AC side meet
the grid-connection requirements. If so and the set time has been reached, the inverter will
turn to the OPERATION mode and feed the generated AC current to the grid.
The inverter needs no manual control during normal operation.
Keep the door closed and locked. Store the keys of the door by appointed
personnel.

4 Start & Stop Operation Manual
14
4.2 Stopping
Inverter stops during normal maintenance and service work or when a fault occurs.
4.2.1 Normal Stopping
Proceed as follows to stop the inverter during normal maintenance and service work:
Step 1Stop the inverter through the stop instruction on the LCD.
Step 2Turn the inverter Start/Stop switch to the "STOP" position.
Step 3Open the inverter cabinet door, turn the AC Switch to the "OFF" position, and close the
cabinet door.
Step 4Disconnect the inverter downstream switches.
Step 5Open the inverter cabinet door, turn the DC Switches to the "OFF" position, and close the
cabinet door.
Step 6Disconnect the inverter upstream switches.
Step 7Disconnect external power supply source if the inverter is in external power supply mode.
Step 8The inverter stops.
During normal operation, disconnection of AC or DC main switch is strictly
forbidden. Otherwise, the switch can be damaged and the inverter may also be
damaged.
4.2.2 Stopping in Case of Fault
Proceed as follows to stop the inverter when a fault or emergency occurs:
Step 1Press down the emergency stop button or turn the start/stop switch to the “STOP” position.
Step 2Open the inverter cabinet door, turn the AC Switch to the "OFF" position, and close the
cabinet door.
Step 3Disconnect the inverter downstream switches.
Step 4Open the inverter cabinet door, turn the DC Switches to the "OFF" position, and close the
cabinet door.
Step 5Disconnect the inverter upstream switches.
Step 6Disconnect external power supply source if the inverter is in external power supply mode.
Step 7The inverter stops.
The Start/Stop switch and emergency stop button can be used only in case of
emergency or fault. Normally, stop the inverter according to the stop
instructions on the LCD.
Press down the emergency stop button immediately in case of emergency to
take quick response.