Sungrow SG30KU User manual

SG30KU_SG36KU-UEN-Ver10-201403 Version: 1.0
User Manual
SG30KU/SG36KU
PV Grid-Connected Inverter

I
About This Manual
This manual is for the inverters SG30KU and SG36KU. These inverters are
grid-connected, transformer-less, robust and of high conversion efficiency. The
device will bring you profit 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 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 the 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 will be periodically updated or revised due to the
product development. 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 the following 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 5 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 the hot
surface when the device is running.
Look over the user manual before any operation on the inverter!
The installation and service of the inverter unit can only be
performed by qualified personnel.

IV
Contents
1Safety Instructions...................................................................1
1.1 IMPORTANT SAFETY INSTRUCTIONS..............................................................1
1.2 Arc Fault Detection (AFD)...................................................................................5
2Product Introduction ...............................................................6
2.1 Intended Usage......................................................................................................6
2.2 Product Description..............................................................................................7
2.2.1 Product Appearance ................................................................................................7
2.2.2 Dimensions of Inverter............................................................................................8
2.2.3 LCD Display Panel......................................................................................................8
2.2.4 DC Switch .....................................................................................................................9
2.3 Technical Description........................................................................................ 10
2.3.1 Principle Description.............................................................................................10
2.3.2 Functions Description ..........................................................................................11
2.3.3 Derating.....................................................................................................................12
3Installation Flow.....................................................................14
4Unpacking and Storage .........................................................16
4.1 Unpacking and Inspection.............................................................................. 16
4.2 Available Versions............................................................................................... 17
4.3 Identifying Inverter............................................................................................ 18
4.4 Delivery Contents............................................................................................... 19
4.5 Storage of Inverter ............................................................................................. 20
5Mechanical Installation .........................................................21
5.1 Selecting Installation Location...................................................................... 21
5.2 Moving Inverter to Installation Site ............................................................. 23
5.3 Installing the Inverter........................................................................................ 24
5.3.1 Installing on Concrete Wall.................................................................................25
5.3.2 Installing on Metal Frame....................................................................................26

V
5.3.3 Installing on the Floor .......................................................................................... 28
5.3.4 Horizontally Installing .......................................................................................... 29
6Electrical Connection.............................................................31
6.1 Connection Conduit Entries............................................................................ 32
6.2 Combiner Unit Description ............................................................................. 33
6.3 Connecting Inverter to AC Grid .....................................................................35
6.3.1 AC Side Requirements.......................................................................................... 35
6.3.2 Grid Connection ..................................................................................................... 35
6.4 Connecting Inverter to PV Arrays.................................................................. 38
6.4.1 PV Inputs Configuration ...................................................................................... 39
6.4.2 PV Connection Procedures................................................................................. 41
6.5 Grounding the Inverter.....................................................................................43
6.5.1 Grounding System Overview............................................................................. 43
6.5.2 Second Protective Earth Terminal.................................................................... 44
6.6 Communication Connection .......................................................................... 45
6.6.1 Communication Overview.................................................................................. 45
6.6.2 Communication System ...................................................................................... 46
6.6.3 RS485 Communication Connection................................................................ 48
6.6.4 Configurable Dry Contact................................................................................... 50
6.6.5 RS485-NET Converting Card (Optional)......................................................... 50
7Commissioning ......................................................................51
7.1 Inspection before Commissioning ...............................................................51
7.2 Commissioning Procedure..............................................................................51
8Disconnecting, Dismantling and Disposing the Inverter ....54
8.1 Disconnecting the Inverter ............................................................................. 54
8.2 Dismantling the Inverter..................................................................................55
8.3 Disposing the Inverter ......................................................................................57
9Troubleshooting and Maintenance ......................................58
9.1 Troubleshooting..................................................................................................58
9.1.1 Troubleshooting of LED Indicator.................................................................... 58
9.1.2 Arc Fault Detection Self-test Fault ................................................................... 59

VI
9.1.3 DC Arc Fault..............................................................................................................59
9.1.4 Troubleshooting of Faults in LCD Screen ......................................................59
9.2 Maintenance ........................................................................................................ 64
9.2.1 Routine Maintenance ...........................................................................................64
9.2.2 Maintenance Instruction ..................................................................................... 65
9.3 Contact Sungrow Service ................................................................................ 68
10 Operation of LCD Display ......................................................69
10.1 Description of Button Function..................................................................... 69
10.2 Inverter Menu Structure................................................................................... 70
10.3 Main Screen.......................................................................................................... 71
10.4 Adjust Contrast.................................................................................................... 72
10.5 Detailed Running Information....................................................................... 73
10.6 History Records ................................................................................................... 74
10.6.1 Running Information Records.........................................................................74
10.6.2 Fault Records .........................................................................................................74
10.7 Start and Stop Inverter ..................................................................................... 75
10.8 Input Parameter Settings Password............................................................. 75
10.9 System Parameters Setting............................................................................. 76
10.9.1 Time Setting...........................................................................................................76
10.9.2 Energy Deviation Adjustment.........................................................................76
10.9.3 Load Default ..........................................................................................................77
10.9.4 Firmware Version..................................................................................................77
10.10 Running Parameters Setting .......................................................................... 78
10.10.1 Main Menu of Run-param..............................................................................78
10.10.2 Reactive Power Regulation............................................................................ 79
10.10.3 Save P/Q-set ........................................................................................................79
10.11 Protective Parameters Setting ....................................................................... 80
10.12 Communication Parameters Setting........................................................... 83
10.13 Advanced Parameters Setting ....................................................................... 83
10.13.1 PVS Detect Settings..........................................................................................83
10.13.2 AFD Settings........................................................................................................84

VII
11 Appendix ................................................................................86
11.1 Technical Data......................................................................................................86
11.2 Grid Over-/Under-voltage Parameter.......................................................... 88
11.3 Grid Over-/Under-frequency Parameter.....................................................88
11.4 P-Q Curve............................................................................................................... 88
11.5 Automatic Power Derating..............................................................................89
11.5.1 Temperature-related Power Derating.......................................................... 89
11.5.2 Input Voltage-related Power Derating ........................................................ 90
11.6 Exclusion of Liability ..........................................................................................91
11.7 About Us ................................................................................................................92

1
1 Safety Instructions
1.1 IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS. This manual contains important instructions for
SG30KU and SG36KU inverter that shall be followed during installation and
maintenance of the inverter.
The SG30KU and the SG36KU have been designed and tested strictly according to
the international safety regulations. As electrical and electronic equipment, safety
instructions related to them must be complied with during installation,
commissioning, operation and maintenance. Incorrect operation or work may result
in damage to:
yThe life and well-being of the operator or a third party
yThe inverter and other properties that belong to the operator or a third party
Therefore, the following 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
ybeen trained specially;
yalready completely read through and understood the manual and other
related documents;
ybeen familiar with safety requirements for electrical system.
Technical personnel mentioned above may perform the following work:
yInstall the inverter onto the wall
yConnect the inverter into the PV power system
yConnect other devices into the PV power system
yCommission the inverter
yMaintain and service the inverter

1 Safety Instructions User Manual
2
Before Installation
There is a risk of injury due to improperly handling the device!
yAlways follow the instructions contained in the manual when moving and
positioning the inverter.
yThe weight of the equipment can cause injuries, serious wounds, or bruise
if improperly handled.
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.
yWiring of the PV arrays should only be performed by qualified personnel.
yPV modules should be covered by opaque materials during wiring.
All cables must be firmly attached, undamaged, properly insulated and
adequately dimensioned.

User Manual 1 Safety Instructions
3
During Inverter Operation
Do not open the enclosure when the inverter is under voltage. There is an unlikely
but possible risk of explosion in very specific cases of fault. The housing will protect
persons and property from such an explosion, only if it is correctly sealed.
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
There is a risk of inverter damage or personnel injury due to incorrect
service work!
Always keep in mind that the inverter is power supplied by dual power
source: PV arrays and utility grid.
Before any service work, you should obey the following procedures.
yDisconnect inverter from the utility grid side first and then PV arrays;
yWait at least ten minutes until the inner capacitors discharge completely;
yVerify that no voltage or current present with appropriate testing device.
Keep unrelated 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.
yAny fault that may impair the inverter safety functions must be repaired
immediately before the inverter is restarted.
yInverter contains no owner serviceable parts inside. Please contact local
authorized personnel if any service work is required.

1 Safety Instructions User Manual
4
Servicing of the device in accordance with the manual should never be
undertaken in the absence of proper tools, test equipment or more
recent revision of the manual which is clearly and thoroughly
understood.
There is a risk of inverter damage if it is improperly serviced.
Use only accessories and spare parts approved by the inverter
manufacturer. Never modify the inverter or other components of the
inverter. Otherwise it will cause loss of any or 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. Avoid
unnecessary touch with the boards during replacement.
Others
The selected country settings can be changed by qualified personnel only!
Unauthorized modification to country settings should be prohibited.
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:
yMust be clearly visible;
yMust not be removed, covered and pasted.

User Manual 1 Safety Instructions
5
These regulations should also be followed:
yThe regulations related to the electricity fed into grid;
yThe safety instructions related to PV arrays;
yThe safety instructions related to other electrical device.
1.2 Arc Fault Detection (AFD)
According to the 2011 National Electric Code (NEC) and 2013 Canadian Electric Code
(CEC), if the DC voltage of a photovoltaic system is higher than 80V and the system
is on a building or its DC conductors enter a building, it must be equipped with a
special device that can detect a DC arc fault and interrupt the circuit. This
functionality is commonly referred to as a DC AFDI.
The inverter assures to detect the arc fault defined by UL1699B.
The DC ARC-Fault circuit is for series arcing faults or a type 1 device.
The SG30KU and SG36KU inverter’s DC Arc Fault Detection (AFDI) function is based
on the Digital Signal Processor (DSP).
The DC AFD module performs a self-test every time the inverter is started-up or you
can manually activate AFD function on the LCD screen, the result will show on the
LCD screen, which can only be pass or fail. If it fails, the corresponding fault code will
be displayed and the inverter will not connect to the grid. If it passes, the inverter
connects and operates normally.
If a DC arc fault is detected during normal operations, the inverter will disconnect
from the AC grid. The DC arc fault is displayed on the inverter’s LCD screen and the
inverter is powered off until the fault is manually removed.

6
2 Product Introduction
2.1 Intended Usage
SG30KU and SG36KU (They will be referred to as inverter hereinafter unless
otherwise specified) which are a 3-phase string inverter without transformer, are
crucial unit between the PV strings and utility grid in the 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 it into the utility grid. The intended usage of the inverter is illustrated in
Fig. 2-1.
Fig. 2-1 Application of the inverter of the PV Power System
Item Description Note
A PV strings Monocrystalline silicon; polycrystalline silicon and
thin-film without grounding of protection class II
B Inverter SG30KU, SG36KU
C Metering device Mter cupboard with power distribution system
D Utility grid 4W-Y Grid or 3W-Δ Grid
Any other or additional usage is not permitted except the intended usage.
Inverter may only accept PV modules with 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.) cannot be 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.

User Manual 2 Product Introduction
7
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 via the LCD display panel.
2 Connection
openings
Connection openings with plastic threaded plugs for
connecting conduits.
3 Handles The handles are designed for holding the unit when
transporting, installing or servicing.
4 Second PE
Terminals Second protective earth terminals as specified in EN 50178.
5 Air outlet Exit of hot air during the inverter operation.
6 Mounting ear It is used for hanging inverter onto the backplate.
7 Fans There are four fans to perform controlled forced-air cooling.
8 DC switch During normal operation it is in “ON” state. It can shut down
the inverter immediately in “OFF” position.
9 Air inlet Entrance of cool air.
10 AC switch Serviced as an automatic overcurrent device.

2 Product Introduction User Manual
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2.2.2 Dimensions of Inverter
Fig. 2-3 Outline Dimensions of Inverter (unit: mm)
2.2.3 LCD Display Panel
As a human-computer interaction interface, LCD display panel comprises LED
indicators, buttons and LCD display screen on the front panel of the inverter.
yLEDs indicate the working status of the inverter
yThe current running information shown on the LCD display
yFault records shown on the LCD display
yInverter configuration by pressing the buttons
Fig. 2-4 LCD Display Panel

User Manual 2 Product Introduction
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Tab. 2-1 LCD Display Panel Description
No. Name Description
1 LED
indicators
“RUN” and “FAULT”. Inverter current state can be known from the
two indicators. Detailed definition is shown in Tab. 2-2.
2 Buttons
Navigate in the LCD menu, set values and so on. Detailed
function is shown in Tab. 10-1.
3 LCD
screen
LCD screen can display current state of inverter, current running
information, history information and parameters to be set.
Tab. 2-2 Description of LED Indicator Status
LED Status Description
“RUN”: on; Inverter is feeding AC power to the utility grid.
“FAULT”: off
“RUN”: off; A fault happens;
or protection function triggers.
“FAULT”: on
“RUN”: off; Inverter is not energized;
or there is a communication error between DSP and LCD.
“FAULT”: off
2.2.4 DC Switch
DC switch is designed for safely disconnecting the DC input current if required.
The inverter works automatically when input and output meet the requirements.
Rotating DC switch to the “OFF” position will immediately cut off the flow of DC
current.
Rotate the DC switch to the“ON”position, before restarting the inverter.

2 Product Introduction User Manual
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2.3 Technical Description
2.3.1 Principle Description
The principle design of transformer-less and grid-connected inverters are illustrated
below.
They are equipped with MPPTs for two DC inputs to ensure that the maximum
power can be utilized even in different PV modules installation conditions.
Inversion circuit converts DC power into AC power, which will be fed into the utility
grid via five core terminals. Protective circuits are designed to guarantee inverter
safe operation and human safety.
A DC switch is integrated for safe disconnection of DC current. The inverter provides
standard interface RS485 for communication. Inverters are also provided running
records display and parameters configuration via human-computer interface – LCD
display panel.
Fig. 2-5 Main Circuit Diagram of SG30KU and SG36KU
*Image shown here is indicative only. Actual product you receive may differ.