Sungrow SG2K5TL User manual

SG2K5_3K_4KTL-V31-UEN-Ver12-201206 Version: 1.2
SG2K5TL/SG3KTL/SG4KTL-31
PV Grid-Connected Inverter
User Manual

I
About This Manual
This manual is for the inverter SG2K5TL-31, SG3KTL-31 and SG4KTL-31. These
inverters are grid-connected, transformer-less, robust and of high conversion
efficiency. The device will bring you more profits from PV power system.
Aim
The manual contains information about the inverter, which will provide you guidelines
to connect the inverter into the PV power system and operate the inverter.
Related Documents
The manual cannot include complete information about the PV system. You will get
the additional information about other devices at www.sungrowpower.com/download
or via webpage of device manufacturer.
Target Group
The manual is targeted to technical personnel who is responsible for inverter
installation and commissioning in the PV power system and inverter owner who will
perform daily LCD operation.
How to Use This Manual
Read this manual and other related documents before any work with the inverter.
Documents must be stored carefully and available at all times.
The contents of the manual due to the product development will be periodically
updated or revised. It is probably that there are changes of manual in subsequent
inverter edition. The latest manual can be acquired via visiting the web page
www.sungrowpower.com.

II
Symbols Explanation
Important instructions contained in this manual should be followed during installation,
operation and maintenance of the inverter. And they will be highlighted by these
symbols.
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.

III
Symbols on the Inverter Body
This symbol indicates that you should wait at least 10 minutes after
disconnecting the inverter from the utility grid and from the PV input before
touching any inner live parts.
Hot surface! In order to reduce the risk of burns, do not touch device hot
surface when the device is running.
Look over the user manual before any operation onto the inverter!
The installation and service of the inverter unit can only be performed by
qualified personnel.
Do not disconnect DC connectors from the unit under load!

I
Contents
About This Manual ................................................................................................... I
1 Safety Instructions ................................................................................................. 1
IMPORTANT SAFETY INSTRUCTIONS .............................................................................................. 1
SAVE THESE INSTRUCTIONS ........................................................................................................... 1
2 Product Introduction.............................................................................................. 7
2.1 Intended Usage ................................................................................................................................ 7
2.2 Product Description .......................................................................................................................... 8
2.2.1 Product Appearance................................................................................................................. 8
2.2.2 Dimensions and Weight of Inverter .......................................................................................... 9
2.2.3 LCD Display Panel ................................................................................................................... 9
2.2.4 DC Switch............................................................................................................................... 10
2.3 Technical Description.......................................................................................................................11
2.3.1 Principle Description................................................................................................................11
2.3.2 Functions Description..............................................................................................................11
3 Workflow about Inverter .................................................................................... 13
4 Unpacking and Storage ....................................................................................... 15
4.1 Unpacking and Inspection .............................................................................................................. 15
4.2 Identifying Inverter .......................................................................................................................... 16
4.3 Delivery Contents ........................................................................................................................... 17
4.4 Storage of Inverter .......................................................................................................................... 18
5 Installing Inverter onto Wall.............................................................................. 19
5.1 Selecting Installation Location ........................................................................................................ 19
5.2 Moving Inverter to Installation Site ................................................................................................. 22
5.3 Installation Procedure ..................................................................................................................... 23
6 Electrical Connection ........................................................................................... 25
6.1 Terminals Description ..................................................................................................................... 25
6.2 Simplified Electrical Connection Diagram....................................................................................... 26
6.3 Connecting Inverter to AC Grid....................................................................................................... 27
6.3.1 AC Side Requirements ........................................................................................................... 27
6.3.2 Assembling AC Connector with Cables.................................................................................. 29
6.3.3 Connecting Inverter to AC Grid .............................................................................................. 31

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6.4 Connecting Inverter to PV Arrays ................................................................................................... 31
6.4.1 Assembling DC Cable to Connector....................................................................................... 32
6.4.2 Wiring Procedures.................................................................................................................. 34
6.5 PV System Grounding .................................................................................................................... 35
6.6 Communication Connection............................................................................................................ 36
6.6.1 Communication Types............................................................................................................ 36
6.6.2 RS485 Communication Connection ....................................................................................... 36
7 Commissioning ..................................................................................................... 39
7.1 Verify before Commissioning.......................................................................................................... 39
7.2 Commissioning Procedures............................................................................................................ 39
8 Disconnection of Inverter ................................................................................... 41
9 Troubleshooting ................................................................................................... 43
9.1 Troubleshooting of LED Indicator ................................................................................................... 43
9.1.1 Troubleshooting of LED Indicator........................................................................................... 43
9.1.2 Troubleshooting of Faults in LCD Screen .............................................................................. 44
9.2 Maintenance ................................................................................................................................... 46
9.2.1 Cleaning the Cabinet.............................................................................................................. 46
9.2.2 Cleaning the Heat Sink........................................................................................................... 46
9.2.3 Battery Maintenance .............................................................................................................. 46
10 Operation of LCD Menu................................................................................... 48
10.1 Description of Button Function...................................................................................................... 48
10.2 Operation Mode of Inverter........................................................................................................... 49
10.3 Overview of Complete LCD Menu ................................................................................................ 50
10.4 The Default Screen ....................................................................................................................... 51
10.5 Contrast Adjustment...................................................................................................................... 51
10.6 Current Running Information ........................................................................................................ 52
10.7 Historical Information .................................................................................................................... 52
10.7.1 Running Record.................................................................................................................... 52
10.7.2 Fault Record ......................................................................................................................... 53
10.8 Language Settings ........................................................................................................................ 54
10.9 Time Settings ................................................................................................................................ 54
10.10 Deviation of E-tot Adjustment...................................................................................................... 55
10.11 Load Default Settings.................................................................................................................. 56
10.12 Firmware Version ........................................................................................................................ 56
10.13 Auto-test (Only for Italy) .............................................................................................................. 57
10.14 Running Parameters Settings ..................................................................................................... 58
10.15 Protective Parameters Settings .................................................................................................. 59
10.16 Communication Parameters Settings ......................................................................................... 61

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10.16.1 Address Settings................................................................................................................. 62
10.16.2 Protocol Settings................................................................................................................. 62
10.17 Inverter Start and Stop ................................................................................................................ 63
APPENDIX .................................................................................................................. 64
Electrical Specifications........................................................................................................................ 64
Temperature Derating Curve ............................................................................................................... 66
Exclusion of Liability............................................................................................................................. 67
About Us............................................................................................................................................... 68
Contact Information .............................................................................................................................. 68

IV

1
1 Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
Inverter SG2K5TL-31, SG3KTL-31 and SG4KTL-31 have been designed and tested
strictly according to the international safety regulations. However, for electrical and
electronic equipment, safety instructions related to electrical device must be complied
with during installation, commissioning, operation and maintenance. Operation or
work performed incorrectly may result in damage to:
zThe life and well-being of the operator or a third party
zThe inverter and other properties that belong to the operator or a third party
Therefore in order to reduce the risk of personal injury, inverter damage or other
properties damage, the following general safety instructions must be read and always
kept in mind prior to any work. All detailed work-related safety warnings and notes will
be specified at the critical points in corresponding chapter.
All installation and electrical work must only be performed by qualified
personnel. They have
zbeen trained specially;
zalready completely read through and understood the manual and other
related documents;
zbeen familiar with safety requirements for electrical system.
Technical personnel mentioned above may perform the following work:

SG2K5TL/SG3KTL/SG4KTL-31 User Manual
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zInstall the inverter onto the wall
zConnect inverter into the PV power system
zConnect other devices into the PV power system
zCommission the inverter
zMaintain and service the inverter
Before Installation
There is a risk of injury due to improperly handling the device!
zAlways follow the instructions contained in the manual when moving and
positioning the inverter.
zThe weight of the equipment can cause injuries, serious wounds, or
bruising if it is not handled correctly.
During Installation
Prior to installing the inverter onto the wall, it is crucial to make certain that the inverter
is not electrically connected.
System performance loss due to bad ventilation!
The equipment requires good quality ventilation during operation. It is essential
to keep the unit upright and nothing covering the heat sink in order to ensure
that the equipment interior is well cooled down.
During Electrical Connection
Lethal voltage exists!
PV arrays will produce electrical energy when exposed to sunlight and thus can
create an electrical shock hazard.
zWiring of the PV arrays should only be performed by qualified personnel.
zPV modules should be covered by opaque materials during wiring.

Safety Instructions 1
3
All cables must be firmly attached, undamaged, properly insulated and
adequately dimensioned.
During Inverter Operation
There is a risk of inverter’s damage or personal injury!
Do not disconnect DC connectors while the inverter is under AC load! First
de-energize the equipment from dual power sources and verify that there is no
voltage present.
There is a risk of burn!
Prevent from touching device hot parts (such as heat sink) during operation.
Only LCD display panel and DC switch can be touched during inverter
operation.
Maintenance and Service
zAny malfunction that may impair inverter safety functions must be repaired
immediately before the inverter is restarted again.
zInverter contains no owner serviceable parts inside. Please contact local
authorized personnel if any service work is required.
Servicing of the device in accordance with the manual should never be undertaken in
the absence of proper tools, test equipments and the more recent revision to the
manual which is clearly and thoroughly understood.

SG2K5TL/SG3KTL/SG4KTL-31 User Manual
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There is a risk of inverter damage or personnel injury due to incorrect service
work!
Always keep in mind that inverter is power supplied by dual power source: PV
arrays and utility grid.
Before any service work, you should obey the following procedures.
zDisconnect inverter from the utility grid side first and then PV arrays;
zWait at least ten minutes for inner capacitors discharge completely;
zVerify that no voltage and current present with appropriate testing device.
Keep non-related person away!
A temporary warning sign and barrier must be posted to keep non-related
person away for any period while performing electrical connection and service
work.
Do not open the enclosure when the inverter is under voltage. There is a highly
unlikely risk of explosion in very specific cases of malfunction. The housing will protect
persons and property from such an explosion, only if it is correctly sealed.
There is a risk of inverter damage if it is improperly serviced.
Use only accessories and spare parts approved by the inverter manufacturer.
And never modify the inverter or other components of the inverter. Otherwise it
will lead to loss of any and all warranty rights.
There is a risk of inverter damage due to electrostatic discharge!
The printed circuit boards contain components sensitive to electrostatic
discharge. Wear a grounding wrist band when handling the boards. Do not
touch the boards unnecessarily during replacement.

Safety Instructions 1
5
Others
The selected country settings can be changed by qualified personnel only!
Alternation of the country settings may cause a breach of the type-certificate
marking.
All safety instructions, warning labels and nameplate on the inverter body:
zMust be clearly visible;
zMust not be removed, covered and pasted.
These regulations should also be followed:
zThe regulations related to the electricity fed into grid;
zThe safety instructions related to PV arrays;
zThe safety instructions related to other electrical device.

SG2K5TL/SG3KTL/SG4KTL-31 User Manual
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2 Product Introduction
2.1 Intended Usage
SG2K5TL-31, SG3KTL-31 and SG4KTL-31(They will be referred to as inverter
hereinafter unless otherwise specified), single-phase without transformer string
inverters, are crucial units between the PV arrays and utility grid in the small-scaled
PV power system.
Inverter is dedicated to converting direct current power generated by the PV modules
into alternating current, which conforms to parameters of local utility grid, and feeds
the alternating current into the utility grid. An example about intended usage of the
inverter is show in Fig 2-1.
Where the positive or negative terminal of PV strings needs to be grounded,
inverter cannot be connected to PV modules of this type.
Fig 2-1 Inverter Applied in the PV Power System

SG2K5TL/SG3KTL/SG4KTL-31 User Manual
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Item Description Remark
A PV strings monocrystalline silicon; polycrystalline silicon and thin-film without
grounding of protection class II
B Inverter SG2K5TL-31, SG3KTL-31 or SG4KTL-31 involved
C Metering device meter cupboard with power distribution system
D Utility grid TT, TN
Any other or additional usage is not permitted except the intended usage.
Inverter may only accept PV modules of Protection Class II as its input.
Inverter may only be connected to utility grid via distribution board. Local loads
(home appliance, lights, motor loads, etc.) can not connected between inverter
and AC circuit breaker on the distribution board.
Additionally, the unit is intended for fixed installation. Located on a part that is
not removable without impairing the operation of the unit.
2.2 Product Description
2.2.1 Product Appearance
Fig 2-2 Product Components Description
Item Name Description
1 LCD display
panel
Inverter operation data viewing and parameters configuration can be
performed on the LCD display panel.

Product Introduction 2
9
Item Name Description
2 DC switch Optional component. It is designed for safely disconnecting DC
current.
3 DC terminals There are three pairs of DC terminals between PV arrays and inverter.
4 RS485
terminals
Standard communication interface.
5 AC terminal Inverter feeds power to utility grid via this terminal.
6 Mounting ear It is used for hanging inverter onto the backplate.
7 Heat sink It is used for cooling down the unit temperature during operation.
8 Fan Only SG4KTL-31 is equipped with fan to help air ventilation.
2.2.2 Dimensions and Weight of Inverter
Fig 2-3 Dimensions of Inverter
Table 2-1 Dimensions Value
Type W(mm) H(mm) D(mm) Net weight(kg)
SG2K5TL-31 420 555 179 20
SG3KTL-31 420 555 179 20
SG4KTL-31 420 555 179 20
2.2.3 LCD Display Panel
As a friendly human-computer interaction interface, LCD display panel comprises
LED indicators, buttons and LCD display screen on inverter front panel.
zLEDs indicate the working status of the inverter
zThe current running information shown on the LCD display

SG2K5TL/SG3KTL/SG4KTL-31 User Manual
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zMalfunction records shown on the LCD display
zInverter configuration by pressing the buttons
Fig 2-4 LCD Display Panel
No. Name Description
1 LED
indicators
“RUN” and “FAULT”. Inverter working status can be known from the two
indicators. Detailed definition is shown in Table 2-2.
2 LCD
Screen
LCD screen can display the current state of inverter, current running
information, history information and parameters to be set.
3 Buttons
Navigate in the LCD menu, select values and so on. Detailed functions are
shown in Table 10-1.
Table 2-2 Description of LED Indicator
LED State Description
“RUN”: on Inverter is feeding AC power to the utility grid.
“FAULT”: off
“RUN”: off A malfunction happens;
Or a protection function is activated.
“FAULT”: on
“RUN”: off Inverter is not energized;
There is communication error between DSP and LCD.
“FAULT”: off
2.2.4 DC Switch
DC switch is designed for safely disconnecting the DC current if required.
The inverter works automatically when input and output meet the requirements. If you
want to interrupt its running or if a malfunction occurs, rotate DC switch to the “OFF”
position to stop inverter from running.