Sungrow SG1250UD User manual

SG1250UD_SG1500UD-V21-IEN-Ver12-201910
SG1250UD/SG1500UD
Outdoor Central Inverter
Installation Manual

Contents
1About This Manual....................................................................1
1.1 Validity .........................................................................................................1
1.2 Brief Introduction .........................................................................................1
1.3 Target Group................................................................................................2
1.4 How to Use This Manual .............................................................................2
1.5 Symbol Explanation.....................................................................................2
2Safety Instructions ...................................................................4
2.1 Intended Use...............................................................................................4
2.2 Safety Use Description................................................................................4
2.2.1 Manual Storage...................................................................................5
2.2.2 Staff Requirements .............................................................................5
2.2.3 Labels on the Inverter .........................................................................5
2.2.4 Warning Label Setting.........................................................................5
2.2.5 Emergency Escape Route ..................................................................6
2.2.6 PV Array Protection.............................................................................6
2.2.7 Electrical Connection ..........................................................................6
2.2.8 Measuring Instrument .........................................................................6
2.2.9 Voltage-free Operation........................................................................7
2.2.10 ESD Protection..................................................................................7
2.2.11 Moisture Protection...........................................................................7
2.2.12 Disposal of Waste.............................................................................7
2.2.13 Others ...............................................................................................7
3Delivery......................................................................................9
3.1 Scope of Delivery ........................................................................................9
3.2 Nameplate Identification..............................................................................9
3.3 Inverter Storage.........................................................................................10
4Product Description ...............................................................11
4.1 Exterior Description...................................................................................11
4.1.2 Inverter Appearance..........................................................................11
4.1.3 Ventilation Design .............................................................................12
4.1.4 Cable Entry Design...........................................................................13

4.2 Main Circuit Diagram.................................................................................14
5Installation Design................................................................. 15
5.1 Selecting Installation Location.................................................................. 15
5.1.1 Basic Requirements......................................................................... 15
5.1.2 Requirements for Installation Environment...................................... 15
5.1.3 Requirements for Foundation and Clearance.................................. 15
5.2 Installation Environment Design............................................................... 15
5.2.1 Irradiation Requirements.................................................................. 15
5.2.2 Air Requirement ............................................................................... 15
5.2.3 Foundation requirements................................................................. 16
5.2.4 Clearance Requirement................................................................... 17
5.2.5 Cable Trench Design........................................................................ 18
5.2.6 Ventilation Requirements................................................................. 18
5.2.7 Others............................................................................................... 19
5.3 Cable Routing Requirement..................................................................... 19
5.4 Cable Fastening and Protection............................................................... 20
5.4.1 Cable Fastening............................................................................... 20
5.4.2 Cable Protection............................................................................... 20
6Mechanical Installation.......................................................... 21
6.1 Transport .................................................................................................. 21
6.1.1 Precautions ...................................................................................... 21
6.1.2 Transport.......................................................................................... 22
6.2 Installation ................................................................................................ 23
7Electrical Connection............................................................ 25
7.1 Safety Instructions.................................................................................... 25
7.1.1 General Safety Rules....................................................................... 25
7.1.2 Five safety Rules.............................................................................. 25
7.2 Installation Tools and Spare Parts............................................................ 26
7.3 Cable Connection..................................................................................... 26
7.4 Preparation Before Electrical Connection ................................................ 26
7.4.1 Opening the Front Door ................................................................... 26
7.4.2Removing the Protective Grid.......................................................... 26
7.4.3 Check Connection Cable ................................................................. 27
7.4.4 Cable Connection Precautions ........................................................ 27
7.5 Cable Entry Holes..................................................................................... 27
7.6 Overview of the Connection Area............................................................. 28
7.7 Cable Requirements................................................................................. 28

7.8 DC Side Cable Connection .......................................................................29
7.8.1 Cable Check......................................................................................29
7.8.2 Cable Connection Area.....................................................................30
7.8.3 DC Side Cable Connection...............................................................31
7.9 AC Side Cable Connection........................................................................32
7.9.1 Safety Precautions............................................................................32
7.9.2 Cable Routing ...................................................................................32
7.9.3 Cable Connection..............................................................................33
7.10 Grounding Connection.....................................................................35
7.10.1 Description of Grounding Terminal..................................................36
7.10.2 Grounding of the Shielding Layer of Communication Cable...........36
7.11 Communication Cable Connection..................................................36
7.11.1 Introduction .....................................................................................36
7.11.2 RS485 Communication Solution.....................................................36
7.11.3 Ethernet Communication Solution ..................................................39
7.12 Supply Modes..................................................................................40
7.12.1 Introduction .....................................................................................40
7.12.2 Internal Power Supply.....................................................................41
7.12.3 External Power Supply (Optional)...................................................41
7.13 Closing the Cable Entrance.............................................................41
7.14 Installation Checklist........................................................................42
8Commissioning.......................................................................43
8.1 Commissioning Requirements ..................................................................43
8.2 Check Before Commissioning...................................................................43
8.2.1 Cable Connection Check ..................................................................43
8.2.2Inverter Check...................................................................................43
8.2.3 PV Array Check.................................................................................44
8.2.4 Grid Voltage Check...........................................................................44
8.3 Preparation for Starting .............................................................................45
8.4 Starting......................................................................................................45
8.5 LCD Parameter Setting.............................................................................45
8.6 Commissioning Completion.......................................................................46
9Appendix .................................................................................47
9.1 Technical Parameters................................................................................47
9.1.1 Electrical Parameters........................................................................47
9.1.2 Mechanical Parameters ....................................................................47
9.1.3 System Parameters...........................................................................47

9.1.4 Display and Communication .............................................................48
9.2Exclusion of Liability................................................................................. 48
9.3 Contact Information.................................................................................. 48

1
1 About This Manual
1.1 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.
1.2 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 installation of the inverter.
System introduction
Introduces the scope of delivery, identification method, storage method, inverter
structure, and electrical features and principles.
Installation design
Introduces the system configuration design, installation environment design, cable
routing design, and installation procedure of the inverter.
Installation process and inspection
Describes mechanical installation, electrical installation, communication connection,
and inspection method after installation.
Commissioning guides
Introduces precautions during inverter commissioning and operation processing of the
commissioning.
Others
Introduces the technical data of the inverter, exclusion of liability, and contact
information.

1 About This Manual Installation Manual
2
1.3 Target Group
This manual is intended for persons who perform installation and other operations on the
inverter. The readers should have some professional knowledge of electronics, electrical
wiring, and machinery, and are familiar with electrical and mechanical schematic diagrams.
1.4 How to Use This Manual
Read this manual carefully before installing the device. Keep this manual and other product
component information together to ensure ease of access. In addition to this manual, the
following documentations are provided:
Inverter operation manual (in the scope of delivery)
All rights reserved including the pictures, symbols, and identifiers used in this manual. Any
reproduction or disclosure, even partially, of the contents of this manual is strictly prohibited
without prior written authorization of Sungrow.
1.5 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.

Installation Manual 1 About This Manual
3
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 IP65, 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
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.
Death from electric shock due to touching the live components!
Do not touch the live components of the inverter or connected the utility grid.
Observe all safety regulations.
Lethal high voltage inside!
Follow the warning symbols on the product.
Observe the safety instructions described in this manual and other related
documents.

Installation Manual 2 Safety Instructions
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Electric shock or fire due to device damage or system fault!
Visually inspect whether the device is damaged or at other potential risks before
performing operations.
Check whether other external devices or circuit connections are safe.
2.2.1 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.
2.2.2 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.
2.2.3 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 legible at all times.
Immediately replace the damaged or blurred labels.
2.2.4 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 Safety Instructions Installation Manual
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2.2.5 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.
2.2.6 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.
2.2.7 Electrical Connection
Electrical connection must be performed in accordance with the circuit diagram and the
description in this manual.
Configuration of the PV arrays and technical parameters such as grid level and
frequency must conform to technical data of the inverter.
Connect the inverter to the gird only after an approval is received from the local
power supply company and technical persons have finished the installation.
All electrical connections must comply with national/local standards.
Perform cable connections strictly according to the wiring identifications inside
the device.
2.2.8 Measuring Instrument
During electrical connection, commissioning, or the like, use related electrical measuring
instrument to ensure that the electrical parameters meet requirements.
Use quality measuring instruments with sufficient measuring range. Do not use a
conventional multimeter.
Ensure that the measuring instrument is correctly connected and used to avoid
the electrical arc and other hazards.
Take protective measures (such as wearing insulated gloves) during live line
measurement.

Installation Manual 2 Safety Instructions
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2.2.9 Voltage-free Operation
Perform operations on the inverter only after ensuring it is completely voltage-free.
Ensure that the inverter cannot be powered on accidentally.
Ensure that the inverter interior is completely voltage-free.
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.
Wait at least 15 minutes after the inverter stops to perform operations on the inverter.
2.2.10 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.
2.2.11 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.
2.2.12 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.
2.2.13 Others
Wear suitable protective equipment (for example safety goggles, earplugs, dielectric gloves,
insulating shoes) when transporting or installing 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 transportation,
installation, and commissioning. For any problems not described in this
manual, please contact Sugrow.

2 Safety Instructions Installation Manual
8
For user convenience, a large number of pictures are provided in this manual.
These pictures are indicative only. For details, please refer to the actual
product.

9
3 Delivery
3.1 Scope of Delivery
A
D F
B
E
C
Item
Description
Quantity
Note
A
Inverter
1
-
B
Key
1
-
C
Documents
1
Includes installation manual, operation
manual, delivery inspection report,
certificate, and warranty card, etc.
D
Bolts for DC cable
connection
32
M12×40
E
Grounding screw
assembly
20
M6×16
F
Bolts for AC cable
connection
8
M16×45
Note: The foregoing specification and quantity are based on the inverter of standard
configuration, and the product actually received may differ.
3.2 Nameplate Identification
The user can identify the inverter via the nameplate. The nameplate is attached to the
upper left corner of the inverter back panel, and the nameplate includes information such
as the model, serial number, main technical parameters, logo of certification authority, and
place of origin.

3 Delivery Installation Manual
10
The nameplate includes important parameter information on the inverter, and it
should be protected during transport, installation, maintenance, troubleshooting,
and other operations. Do not damage or tear it!
3.3 Inverter Storage
If the inverter is not to be installed or commissioned immediately upon reception, it should
be stored as described in this chapter. The inverter should be packed and stored in a
well-ventilated, dry, and tidy room. In addition, observe the following requirements:
Place the inverter in its original package with the desiccant inside.
The ground is flat and suitable for the weight of the packed inverter.
The storage environment should be well-ventilated, dry, and without any poundings.
Ambient temperature: -40℃to +70℃; and relative humidity: 0~95% without
condensation.
Take precautions to protect the device against damage due to harsh environment such
as shock cooling, shock heating, and collision.
Inspect the inverter regularly, at least once a week generally. Check the package for
completeness and replace it immediately when necessary.
Unpack and check the inverter in powered on state if it has been stored more than half
a year.
The inverter must be packed during storage!
No outdoor storage or direct exposure to sunlight!
No tilting or stacking!
Open the cabinet door and check the inverter thoroughly to ensure the
completeness and intactness before installing the inverter stored for a long
time. Install the inverter only after it has been tested by qualified personnel.

11
4 Product Description
4.1 Exterior Description
Mechanical dimensions
Height
Depth (D)
Width (W)
(H)
Fig. 4-1 Mechanical dimensions of the inverter
Width (W)
Height (H)
Depth (D)
2,150mm
2,120mm
850mm
Weight
The inverter weights about 1,900kg.
4.1.2 Inverter Appearance
The face and main external components of the inverter are shown in the figure below.
A
E
B
C
D
EE
Fig. 4-2 Appearance of the inverter
Note: The figure takes the standard inverter as an example, and the actual product may
differ.

4 Product Description Installation Manual
12
Item
Name
Description
A
LED indicator
Includes power indicator "POWER", operation indicator
"OPERATION", and fault indicator "FAULT"
B
LCD touchscreen
Displays the data and executes control commands
C
Emergency stop button
Can be used to disconnect the AC side power supply
immediately in case of emergency
D
Start/Stop switch
Used to start/stop the inverter
E
Lock
A total of three, used to open and close the front doors of
the inverter
The AC/DC switch is used to start/stop the device only. Any damages caused by
operations other than described in this manual shall void warranty claims.
4.1.3 Ventilation Design
Cooling air comes into the inverter from the bottom air inlets and hot air goes out of the
inverter from the top air outlets.
Figure
Description
Air volume
A
Front view
Air outlets are designed
on the top, shown by A.
Exhaust air rate:
A+B=4400m3/h
B
CC
Rear view
Air outlets are designed
on the top, shown by B.
Air inlets are designed at
lower parts, shown by
C.
Supply air rate:
C=5500m3/h

Installation Manual 4 Product Description
13
Figure
Description
Air volume
D
Right view
Heat exchangers are
designed on the right
side of the inverter for
heat exchange, shown
by D.
-
4.1.4 Cable Entry Design
Bottom cable entry
For standard inverter, all cables come into or go out of the inverter from the bottom.
Cable entry positions and dimensions are shown in the figure below (in mm).
A B
600
220
995
215
Fig. 4-3 Bottom cable entries
A
B
DC cable entry
AC cable entry

4 Product Description Installation Manual
14
4.2 Main Circuit Diagram
PV array converts the solar energy into DC energy and then sends it to the inverter DC
input side after upstream combining. The DC energy is converted to AC energy through the
inverter. Main circuit diagram inside the inverter is shown in the figure below by using 16
inputs as the example.
DC1+
DC1-
DC8+
DC8-
DC
EMC
filter
AC
filter
AC
EMC
filter
DC circuit
breaker Module
AC contactor AC circuit
breaker
DC SPD
AC SPD
L1
L2
L3
DC1+
DC1-
DC8+
DC8-
DC
EMC
filter
AC
filter
AC
EMC
filter
DC circuit
breaker Module
AC contactor AC circuit
breaker
DC SPD
N1（Left side ）
N2（Right side ）