Sunways ST 30 User Manual

User Manual

Sunways Inverter

ST 30

english

EN

Sunways AG

Photovoltaic Technology

Max-Stromeyer-Str.160

78467 Konstanz, Germany

Phone: [phone]

Fax: [phone]

EMail: [e-mail]

Internet: www.sunways.de

This user manual may only be reprinted or copied in whole or in part with the express, written approval of
Sunways AG. Any type of reproduction, distribution or storage on data carriers in any form and of any kind
not authorised by Sunways AG represents a violation of the applicable copyright laws and will be prosecuted.
We reserve the right to make technical changes which serve to improve the unit or increase the safety
standard, without prior notice.

Publisher responsible for the content: Sunways AG

This user manual contains products and product names which are registered trademarks. The mention of
products and product names is used only for information purposes and does not represent product misuse.
The passages referring to these products in this user manual do not represent original documentation of the
respective product.

I

Introduction

Thank you for choosing a Sunways Solar Inverter from ST series! You have now an innovative, high-quality
product with unique features and consistently high efficiency.

ST Solar Inverters are grid-connected, transformer-less and robust. These devices will bring more profits from
your PV power system.

This user manual contains instructions for using ST 30 inverter. It will help you familiarise yourself with the
functionality of the unit and will provide you the guidelines to operate and connect the inverter into the PV
power system.

The manual is targeted to technical personnel responsible for inverter installation and commissioning in the
PV power system. It also provides the necessary information to perform daily LCD operation.

Read the manual and other related documents before performing any work on the inverter. Documents must
be stored carefully and be always available.

The contents of the manual will be periodically updated or revised due to product development. It is probable
that there are changes of manual in subsequent inverter editions. The latest manual version can be acquired
at Sunways AG web site, www.sunways.de. There, it is also available the additional information about the PV
system and other devices.

II

Important safety instructions

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.

This symbol indicates an immediate danger which will result in death, injury or
serious damage if the applicable safety regulations are not followed.

This symbol indicates an immediate danger with a medium level of risk which, if not
avoided, could result in death or serious injury.

This symbol indicates an immediate danger with a low level of risk which, if not
avoided, could result in minor or moderate injury.

This symbol indicates a situation which, if not avoided, could result in equipment or
property damage.

This symbol indicates important additional information, emphasized contents or
tips which contribute to a better understanding of the inverter and help to solve
problems and save time.

Symbols on the Inverter Body

This symbol indicates it is necessary to 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 the hot surface when
the device is running.

III

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.

Do not disconnect DC connectors from the unit under load!

IV

Introduction.........................................................................................................................I

1 Safety Instructions..........................................................................................................1

2 Product Introduction ......................................................................................................4

2.1 Intended Usage ............................................................................................................................... 4

2.2 Product Description......................................................................................................................... 5

2.3 Technical Description ...................................................................................................................... 7

3 Installation Flow ...........................................................................................................10

4 Unpacking and Storage................................................................................................11

4.1 Unpacking and Inspection ............................................................................................................ 11

4.2 Identifying Inverter ....................................................................................................................... 11

4.3 Delivery Contents .......................................................................................................................... 12

4.4 Storage of Inverter........................................................................................................................ 12

5 Installing Inverter onto Wall........................................................................................14

5.1 Selecting Installation Location ..................................................................................................... 14

5.2 Moving Inverter to Installation Site ............................................................................................. 16

5.3 Installing the Inverter ................................................................................................................... 16

6 Electrical Connection....................................................................................................19

6.1 Simplified Electrical Connection Diagram.................................................................................... 19

6.2 Terminals Description.................................................................................................................... 19

6.3 Connecting Inverter to AC Grid.................................................................................................... 20

6.4 Connecting Inverter to PV Arrays................................................................................................. 23

6.5 Grounding the Inverter................................................................................................................. 27

6.6 Communication Connection ......................................................................................................... 29

7 Commissioning..............................................................................................................33

7.1 Inspection before Commissioning ................................................................................................ 33

7.2 Commissioning Procedure ............................................................................................................ 33

8 Disconnecting, Dismantling and Disposing the Inverter ..........................................35

8.1 Disconnecting the Inverter ........................................................................................................... 35

8.2 Dismantling the Inverter............................................................................................................... 35

8.3 Disposing the Inverter................................................................................................................... 35

9 Troubleshooting and Maintenance.............................................................................36

9.1 Troubleshooting............................................................................................................................ 36

9.2 Maintenance.................................................................................................................................. 40

9.3 Contact Sunways Service............................................................................................................... 43

10 Operation of LCD Display ..........................................................................................44

10.1 Description of Button Function .................................................................................................. 44

10.2 Inverter Menu Structure ............................................................................................................. 45

10.3 Main Screen ................................................................................................................................. 46

10.4 Adjust Contrast............................................................................................................................ 47

10.5 Detailed Running Information ................................................................................................... 47

10.6 History Records............................................................................................................................ 48

10.7 Start and Stop Inverter................................................................................................................ 49

10.8 Input Parameter Settings Password ........................................................................................... 49

10.9 System Parameters Setting ......................................................................................................... 50

10.10 Running Parameters Setting..................................................................................................... 51

10.11 Protective Parameters Setting .................................................................................................. 54

10.12 Communication Parameters Setting ........................................................................................ 57

V

10.13 Special Settings for Italy............................................................................................................ 57

11 Appendix ........................................................................................................................................ 63

11.1 Technical Data ............................................................................................................................. 63

11.2 Terminals and Cables .................................................................................................................. 64

11.3 Exclusion of Liability.................................................................................................................... 65

1

1 Safety Instructions

Important Satefy Instructions - SAVE THESE INSTRUCTIONS

The ST 30 has been designed and tested strictly according to the international safety regulations. As electrical
and electronic equipment, safety instructions must be complied with during installation, commissioning,
operation and maintenance. Incorrect operation or work may result in damage to:

 The life and well-being of the operator or a third party

 The 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 been trained specially;

 They have already completely read through and understood the manual

and other related documents;

 They are familiar with safety requirements for electrical system.

Technical personnel mentioned above may perform the following work:

 Install the inverter onto the wall

 Connect the inverter into the PV power system

 Connect other devices into the PV power system

 Commission the inverter

 Maintain and service the inverter

Before Installation

There is a risk of injury due to improperly handling the device!

 Always follow the instructions contained in the manual when moving and

positioning the inverter.

 The 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. Do not cover the heat sink to ensure that the equipment
interior is well cooled down.

2

During Electrical Connection

Lethal voltage exists!

PV arrays will produce electrical energy when exposed to sunlight and thus can
create an electrical shock hazard.

 Wiring of the PV arrays should only be performed by qualified personnel.

 PV modules should be covered by opaque materials during wiring.

All cables must be firmly attached, undamaged, properly insulated and adequately
dimensioned.

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 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 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 then 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

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.

 Disconnect inverter from the utility grid side first and then PV arrays;

 Wait at least ten minutes until the inner capacitors discharge completely;

 Verify that no voltage and current are 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.

3

 Any malfunction that may impair the inverter safety functions must be

repaired immediately before the inverter is restarted.

 Inverter contains no owner serviceable parts inside. Please contact local

authorized personnel if any internal service work is required.

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.

Other

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:

 Must be clearly visible;

 Must not be removed, covered or pasted.

These regulations should also be followed:

 The regulations related to the electricity fed into grid;

 The safety instructions related to PV arrays;

 The safety instructions related to other electrical device.

4

2 Product Introduction

2.1 Intended Usage

ST 30 which is a 3-phase string inverter without transformer is a 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.

Inverter CANNOT be connected to the PV modules, the positive or negative
terminal of which needs to be grounded.

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 ST 30

C Metering device meter cupboard with power distribution system

D Utility grid TT, TN-C, TN-S, TN-C-S.

If the PV system exceeds the capacity of one inverter, it is possible to make a multiple connection of several
inverters into the PV system. Each inverter has to be connected to an appropriate section of PV inputs. On the
AC side they are connected in parallel to the 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.

5

2.2 Product Description

2.2.1 Product Appearance

6

7

8

9

3

3

O

F

F

O

N

1

2

3

3

5

4

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
terminals

They are DC input terminals, AC output terminal and RS485
communication terminal.

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.

2.2.2 Dimensions of Inverter

Fig. 2-3 Outline Dimensions of Inverter (unit: mm)

6

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.

 LEDs indicate the working status of the inverter

 The current running information shown on the LCD display

 Malfunction records shown on the LCD display

 Inverter configuration by pressing the buttons

Fig. 2-4 LCD Display Panel

No. Name Description

1 LED indicators

“RUN” and “FAULT”. Inverter current state can be known from the two
indicators. Detailed definition is shown in Table 2-2.

2 Buttons

Navigate in the LCD menu, set values and other. Detailed function is
shown in Table 10-2.

3 LCD screen

LCD screen can display current state of inverter, current running
information, history information and parameters to be set.

Table 2-1 LCD Display Panel Description

LED Status Description

“RUN”: on;

“FAULT”: off

Inverter is feeding AC power to the utility grid.

“RUN”: off;

“FAULT”: on

A malfunction happens;

or protection function triggers.

“RUN”: off;

“FAULT”: off

Inverter is not energized;

or there is a communication error between DSP and LCD.

Table 2-2 Description of LED Indicator Status

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.

Rotate the DC switch to the “ON” position, before restarting the inverter.

7

2.3 Technical Description

2.3.1 Principle Description

The principle design of transformer-less and grid-connected inverter is illustrated in Fig. 2-5.

PV strings input voltage is transmitted to DC BUS via Boost circuit. Inverter is 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 with running records display and parameters configuration via
human-computer interface –LCD display panel.

Fig. 2-5 Main Circuit Diagram of Inverter

2.3.2 Functions Description

Inverter functions can be grouped as the following:

 Conversion function

Inverter converts the direct current power into alternating current power, which conforms to the grid
requirement of its installation country.

 Data storage and display

Inverter stores essential data including running information and fault records, and displays them on
integrated LCD display.

 Parameters configuration

Inverter provides various parameters configuration for optimal operation.

 Communication interface

Standard RS485 interface for connecting other monitoring devices into the PV system is included.

 Protection functions

 Reverse polarity protection
 Short circuit protection

 Insulation resistance to ground surveillance

 Inverter output voltage surveillance

 Inverter output frequency surveillance
 Residual current protection

8

 DC component of AC output current surveillance
 Anti-islanding phenomena protection

 Ambient temperature surveillance

 DC over-voltage protection

 Over current protection
 Power module over-temperature protection

2.3.3 Derating

Derating the output power is a way to protect the inverter from overload and potential malfunctions.
Inverter’s derating function can be activated in the following scenarios:

 PV input overload

 Grid voltage too low

 Temperature too high (Inner temperature and power modules temperature)

 Power limit setting on the inverter LCD display or remote dispatch

 Grid frequency too high (when the Country selection is “DE” or “IT”)

PV Overload Derating

When the PV input power exceeds the defined Max DC Input Power (32 kW), the inverter will reduce the
power evenly to the maximum limit and keep the output power at nominal value.

Fig. 2-6 PV Overload Derating

Power Limit Setting

User may allocate output power value of the inverter via LCD control panel or the remote dispatch from the
grid company. Under this kind of power derating, the operating states will display on the LCD screen.

Over-temperature Derating

Power modules over-temperature may result from high ambient temperature, poor ventilation or fault of
fans. Over-temperature derating may protect the inverter as well as the power modules against damage.

 When the modules temperature exceeds an upper limit, the inverter start to gradually derating until

the temperature decreases to normal range.

9

 When the inner temperature exceeds an upper limit, the inverter start to gradually derating until the

temperature decreases to normal range. .

The deration lower limitation is about 33%.

If both the modules temperature and the inner temperature exceed the limit, the
actual derating power value will be the smallest one.

Grid Under-voltage Derating

Once the grid voltage is in the defined range of Vgrid (Vmin…215V), the inverter will decrease the power
output.

P[Vmin…215V] = Pn × (Vgrid / 230V)

Fig. 2-7 Grid Under-voltage Derating

10

3 Installation Flow

Fig. 3-1 Shows the installation flow of inverter for installer. Please follow these procedures.

Unpacking and Inspection

Read User Manual

Mounting the Inverter

Electrical Connection

Check before Commissioning

Commissioning

Start

Success?

End

Troubleshooting

Yes

No

1

Install Immediately

Storage

2

Mounting Location Selection

4

3

5

6

7

8

Yes

No

Moving Inverter

9

10

Fig. 3-1 Installation Flow Chart

Order Description Reference Chapter

1 Unpacking and inspection Section 4.1

2 Read this manual, especially the section on “safety instruction” Chapter 1

3 Store the inverter unit if not install immediately Section 4.4

4 Choose the best installation site Section 5.1

5 Moving the inverter to installation site Section 5.2

6 Install the inverter against the chosen wall Section 5.3

7

Electrical connections include DC, AC, ground and communication
(optional) connection

Section 6.3...6.6

8 Examine before commissioning Section 7.1

9 Start up inverter and configure corresponding parameters Section 7.2

10 Troubleshooting Section 9.1

Table 3-1 Description of Installation Flow

11

4 Unpacking and Storage

4.1 Unpacking and Inspection

The unit is thoroughly tested and strictly inspected before delivery. Damage may still occur during shipping.

 Check the packing for any visible damage upon receiving.

 Check the inner contents for damage after unpacking.

 Check the completeness of delivery contents according to the inner packing list.

If there is visible damage to the packaging or the inner contents, or if there is something missing, contact the
unit dealer.

Do not dispose of the original packaging. It will be the best choice to store the inverter by re-using the
original packaging.

Fig. 4-1 Packaging for Inverter ST 30

4.2 Identifying Inverter

A nameplate is attached to one side of the inverter and the carton respectively. It provides information on
type of inverter, along with the most important specifications, marks of certification institutions, website and
serial number which is available and identified by Sunways.

Fig. 4-2 Inverter Nameplate (The image is only indicative. Actual product may differ)

12

Icon Description

Don’t dispose of the inverter with the household waste.

Refer to the corresponding instructions.

TUV mark of conformity.

The inverter is in compliance with directives of TUV.

CE mark of conformity.

The inverter is in compliance with directives of CE.

Table 4-1 Description of Icons on the Nameplate

4.3 Delivery Contents

A B C D

Fig. 4-3 Delivery Contents

Item Name Description

A Inverter unit ---

B Backplate It is used for mounting inverter onto the wall.

C Inverter cap It is for inverter’s better weather-proof function.

D Documents

Include quality certificate, packing list, product test report and quick
installation guide

E Expansion bolts Six units. It is used for fastening backplate onto concrete wall.

F Fastener set Six units. It is used for fastening backplate onto metal frame.

G Fix screws 2 M4×16 screws to fix the inverter to the backplate.

H DC connectors Ten pairs. PV input cables must be equipped with the connector.

I

Waterproof
plugs

Four pairs. Seal the unused DC terminals with the waterproof plugs.

4.4 Storage of Inverter

Where the inverter may not be installed immediately or inverter needs to be stored under certain condition,
store the unit as the following indications:

 The unit must be packed into original carton and desiccant must be put inside. If the original packaging

is not available, an equivalent carton which is able to support the unit weight and size can be used.

 The packing should be sealed by adhesive tape.

 The unit must be stored in a clean and dry place to protect against dust and moisture.

 The storage temperature should be always between -25°C and 60°C.

 The recommended number of stack layers is not more than 4.

13

 It is very important to keep the packing away from chemicals. Otherwise it will lead to corrosion.

 During the storage time, periodically check any visible damage by rats and other rodents. Replace the

packaging if necessary.

 The packaging should be kept upright.

 After long term storage, local installer or Sunways should perform a comprehensive test before

connecting the inverter into PV power system.

14

5 Installing Inverter onto Wall

5.1 Selecting Installation Location

Selecting an optimal installation location for the inverter is decisive for its operating safety as well as its
expected efficiency and service life.

 Take the load capacity of the wall into account. The wall

(such as concrete wall and metal structure) should be
strong enough to hold the weight of the inverter over a
long period of time.

 Install the unit where is accessible to install, electrical

connect or service.

 Do not install the unit on a flammable material wall.

 Do not install the inverter where flammable materials or

flammable gas are close to the unit installation.

 Install the unit at eye level to operate buttons easily and

read display.

 Install the inverter vertically with upside up for good heat

dissipation.

15

 Never install the inverter horizontally, with a forward tilt, with a backward tilt or with upside

down.

 The inverter unit with IP65 can be installed indoors or

outdoors.

 The ambient temperature should range from -25°C to

60°C.

 The relative ambient humidity should never exceed 95%.

Moisture may result in corrosion and damage to the inner
electronic components.

 Avoid exposing inverter to direct sunlight or rain or snow to extend its service life despite the

IP65 protection degree. Exposure to the sun may cause additional internal heating which will
cause power reducing. Shaded site of the building is preferred.

Snow
accumulation

Direct rain fallDirect sunlight

 Take enough space for convection into consideration during installing multiple inverters. It is

suggested to position the multiple inverters in a staggered way if necessary.

1000mm1000mm

600mm

1000mm 60 0mm

600mm

600mm

Cool air

Hot air

16

 Do not install the inverter in a closed cabinet.

Otherwise, the inverter will not operate
normally. It is necessary to make sure that hot
air will be discharged by forced ventilation.

 Do not install the inverter where children can

reach.

 Do not install the inverter in living area. Noise

can be produced during running of inverter,
which may affect your daily life.

5.2 Moving Inverter to Installation Site

If the inverter is to be installed, remove the unit from the packaging and move it to the chosen installation
site. During the moving process, the following instructions should be obeyed.

 Always remember the weight of the inverters.

 Grasp the equipment handles by both hands by means of handles.

 Move the unit with the help of others or the lifting device.

 Do not release the equipment unless it has been secured to the wall firmly.

5.3 Installing the Inverter

Inverter is installed onto the wall by means of backplate enclosed in the packaging. If you don’t use the
supplied backplate, you may drill holes (refer to its dimension below).

Fig. 5-1 Backplate Dimensions (mm)

There are supplied two sets of stainless fasteners, to attach the backplate to concrete wall and to a metal
frame.

Fig. 5-2 Dimensions of Expansion Bolt Set for Concrete Wall (mm)

17

Fig. 5-3 Dimensions of Fastener Set for Metal Frame (mm)

5.3.1 Installing on Concrete Wall

Step 1 Remove backplate and fasteners from the packaging.

Step 2 Place the backplate onto the chosen concrete wall and adjust it until it is in a horizontal position.

Step 3 Mark the positions to drill holes using the backplate as template.

Step 4 Drill holes according to the marks made before.

In order to avoid electrical shock or other injury, inspect existing electronic or
plumbing installations before drilling holes.

Step 5 Attach the backplate to the wall firmly with the supplied expansion bolt set. The torque for

fastening the nut is 35 Nm.

Step 6 Assemble the cap onto the inverter for better weatherproof function.

Step 7 Lift up the inverter above the backplate and then slide down to make sure that the recesses on the

back of the inverter fit perfectly together with the backplate.

Step 8 After fitting the inverter to the backplate, fasten it with two M4×16 screws.

18

5.3.2 Installing on Metal Frame

Step 1 Remove backplate and fasteners from the packaging.

Step 2 Choose the best installation site according to above requirements. Place the backplate onto the

chosen metal frame and adjust it until it is in a horizontal position.

Step 3 Mark the positions to drill holes by using the backplate as template.

Step 4 Drill 6 holes at the marks made before. If the shape of the metal frame doesn’t fit the holes on the

backplate, re-drill holes on the backplate at appropriate position according to the chosen frame.

In order to avoid electrical shock or other injury, inspect existing electronic or
plumbing installations before drilling holes.

Mark positions Drill holes

Step 5 Fasten the backplate against the metal frame with bolts and nuts. The dimensions of fasteners

used in the following diagram are recommended. The torque for fastening the nut is 35 Nm.

F

D

A

B

C

Install backplate E

Step 6 Assemble the cap onto the inverter for better weatherproof function.

Step 7 Lift up the inverter above the backplate and then slide down to make sure that the recesses on the

back of the inverter fit perfectly together with the backplate.

Step 8 After fitting the inverter to the backplate, fasten the inverter to the backplate with two M4×16

screws.

Item Description Remark

A

Hexagonal socket
nut

M10

B Spring washer -

C Washer -

D Hexagonal bolt M10*45

E Metallic wall -

F Backplate -

19

6 Electrical Connection

Once the inverter is firmly attached to the appropriate location, it can be connected to the PV power system.

Installation shall comply with local regulations and technical rules and relevant standards and instructions.

Improper operation during the wiring process can cause fatal injury to the operator
or unrecoverable damage to the inverter. Only qualified personnel can perform the
wiring work.

Prior to any electrical connection, keep in mind that inverter has dual power supplies. It is mandatory for
technical personnel to wear personal protective equipment: helmet, footwear and gloves during the electrical
work.

6.1 Simplified Electrical Connection Diagram

Connecting inverter to the existing PV system includes connecting inverter to the local grid and to PV arrays.
There may be communication connection for monitoring inverter operation if necessary.

All electrical connection should follow the wiring rules and standards.

To PV array

To 230V

grid

Fig. 6-1 Simplified Electrical Connection Diagram

6.2 Terminals Description

All electrical terminals and cable openings of the ST 30 are located at the connection cabinet as Fig. 6-2.

No. Description No. Description

1 DC switch 7 Second PE terminal

2 DC SPD 8 DC connection circuit board

3 Configuration circuit board 9 PV input terminals

4 Cooling Fan 10 Communication cable glands

5 AC connection circuit board 11 AC cable gland

6 AC connection terminal block and PE terminal -

20

Fig. 6-2 Connection Cabinet Description

6.3 Connecting Inverter to AC Grid

6.3.1 AC Side Requirements

Only after receiving prior approval from the local grid company as required, should
you connect the inverter to the grid.

Prior to connecting to the utility grid, verify whether the grid voltage and frequency are within the range of
inverter output parameters, referred to “Appendix”. Otherwise consult local grid company for solution.

AC Side Circuit Breaker

An independent three or four-pole circuit breaker (minimum size value 50 A) for each inverter must be
installed at the output side to ensure that the inverter can be securely disconnected.

There are some points that are not allowed for the inverter:

 It is not allowed to use the same circuit breaker for several inverters.

 It is not allowed to connect loads between inverter and circuit breaker.

Residual Current Device

With an integrated universal current-sensitive residual current monitoring unit inside, the inverter is able to
distinguish the fault currents from normal capacitive leakage currents. The inverter will disconnect from
mains as soon as a fault current of more than limit value has been detected.

However if an external RCD or residual current breaker is mandatory, the switch must trigger at a failure
current of 300 mA or higher.

21

Requirements of Multiple Inverters in Parallel Grid Connection

If several inverters are operated in parallel connection to grid, different requirements should be obeyed.

 Scenario 1:

Several inverters are operated in parallel connection to
the three-phase Low Voltage grid.

Requirements:

The sum of all inverters in parallel connection is limited to 34.

See technical information “System Impedance and Stability Recommendation for
Multiple String Inverters in Large PV Power Plant” at Sunways website for more
detailed information

 Scenario 2:

Several inverters are operated in parallel connection to low-voltage side of MV transformer. The high-voltage
side of MV transformer is connected to the Middle Voltage Grid.

Requirements:

 The sum of all inverters in parallel grid connection is limited to 34.

 The rate voltage on the low-voltage side of transformer must meet the inverter output electrical

specification. A neutral point is necessary and must lead outwards as neutral conductor.

The low-voltage side of the transformer must be Y-type.

1MW transformer with a short-circuit impedance less than 6% is recommended.

As mentioned in the scenarios above, the total number of inverters is always less
than or equal to 34. If there are inverters more than the limited value, inverters may
not operate normally.

6.3.2 Grid Connection

An AC terminal block inside the connection cabinet is used for the five-wire grid connection (L1, L2, L3, N, PE)
of the inverter. And feed-in power is always three-phase via the AC terminal.

AC Cable Requirements

Consider the following facts when select AC cables specifications and types:

22

 The grid impedance of the AC cable must correspond to the specification to avoid unintended

disconnection from the grid or derating of the output power.

 Voltage drop and other consideration may use the larger size cables. Avoid power loss in cables of more

than 1% of nominal inverter rating.

 Withstand ambient temperature;

 Layout type (inside wall, underground, free air etc.);

 UV resistance.

Connecting Inverter to AC Grid

Danger to human life due to high voltage existing inside the inverter!

Make sure that all the DC and AC cables to the inverter are not live before you start
the electrical work.

Do not turn on the AC side circuit breaker until all inverter electrical connections
have completed.

Connect the inverter exclusively to TN or TT mains as the following procedures:

Step 1 Disconnect AC circuit breaker and prevent it from reconnection

inadvertently.

Step 2 Loose the six screws on the lower connection cabinet.

Step 3 Strip off AC cables as the following indication.

For flexible cables (stranded wires), use cold pressing terminal lugs (plastic sleeves).

No. Description Remark

A Protective layer

Accepted cable external diameter ranges from 22 mm to
27 mm.

B Length of insulation to be stripped off 16 mm

C Insulation layer -

D Cross section of AC cables Recommendation value: 10 mm² (7 AWG)

23

The maximum accepted cable external diameter ranges from 22 to 27 mm, whereas
each individual terminal of the terminal board accepts a cable with cross-section of
up to 16 mm².

Step 4 Insert AC cables through cable gland from outside.

Step 5 Fix all cables ends to the corresponding terminals using a cross screwdriver according to markings

on the block.

 Observe the pin assignment of AC terminal block. If a phase wire is

connected to the “PE” terminal, it may permanently destroy the
inverter.

 Please avoid squeezing the cable insulation layer into the AC terminal.

Improper connection may damage the inverter.

Step 6 Screw cap nut tightly onto the cable.

6.4 Connecting Inverter to PV Arrays

Lethal voltage exists!

PV arrays produce electrical energy when exposed to light and thus can create an
electrical shock hazard. Cover the PV arrays with opaque materials and then
perform the wiring. Wiring should only be performed by qualified personnel.

Make sure that the maximum input-ground capacity of the inverter is less than
(0,12 uF/kW)*30 kW, otherwise the inverter will not function properly.

Before connecting the PV arrays to the inverter, make sure that the impedances
between the positive terminal of the PV string and Earth and the impedances
between the negative terminal of the PV string and Earth are larger than 1 MOhm.

ST 30 inverter has two PV input areas DC1 input and DC2 inut, each owning its MPP tracker. The two PV inputs
can be configured in independent mode or parallel mode.

24

There is a risk of inverter damage! The following requirements should be met;
otherwise they will lead to loss of any and all warranty rights.

 Make sure that the maximum short circuit current of total DC input is

less than inverter allowable limit.

 Make sure that the maximum open voltage of each string is less than

1000 V. Voltage over 1000 V can damage the inverter.

6.4.1 PV Configuration Mode- Independent Mode

For independent mode, the two PV inputs work independently, each with its own MPPT. Therefore the two
PV inputs can be different with each other, including different PV module types, different numbers of
connected in PV string, different tilt angles or orientation angle of PV modules.

As shown in the following diagram, inverters should choose independent mode due to different orientation
angle between the two PV inputs.

To make sure maximum DC power can be utilized, PV strings connected to
individual input area should have a homogeneous structure, including the same
type, the same number, identical tilt and identical orientation.

Prior to connecting inverter to PV inputs, the following electrical specifications must be met:

Total DC Power Limit for
Inverter

DC Power Limit for
each Input

Open-circuit Voltage
Limit for Each Input

Maximum Current Limit
for each MPPT Input

32 kW 16 kW 1000 V 40 A

You should take the negative open-circuit voltage temperature coefficient of PV module into consideration
when designing the PV string.

6.4.2 PV Configuration Parallel Mode

For parallel mode, the PV inputs can be configured in parallel inside the connection cabinet.

All PV strings connected to the ST 30 have a homogenous structure, including the same type, the same
number, identical tilt and identical orientation.

As shown in the following diagram, the ST 30 may choose parallel mode due to no difference between the
two PV inputs.

25

Prior to connecting the ST 30 to PV inputs, the following electrical specifications must be met simultaneously:

Total DC Power Limit for
Inverter

Open-circuit Voltage Limit for Each
Input

Maximum Current Limit for total
MPPT Input

32 kW 1000 V 80 A

You should also take the negative open-circuit voltage temperature coefficient of PV module into
consideration when designing the PV string.

6.4.3 Configuration of PV Connection Mode

PV configuration mode of the ST 30 can be performed by a switch on the configuration circuit board.

 Independent mode: turn the switch ON.

 Parallel mode: turn the switch OFF.

6.4.4 PV Connection Procedures

DC cables from PV strings should be equipped with DC connectors. Sunways provides corresponding plug
connectors in the scope of delivery for quick connection of PV inputs. Pairs of MC4 DC connectors are supplied
in the scope of delivery.

To maintain IP65 weatherproof function of inverter, only the supplied DC
connectors or the connectors of the same protection class can be used.

DC Cable Requirements

Cross-section Area
Range

Outer cable
diameters

Max. Withstand Voltage

Max. input current for each
PV string

4...6 mm² 6…9 mm 1000 V 10 A

The input current of each input channel should be less than 10 A, otherwise the
fuse may blow out.

26

DC Cable Connection Procedures

Make sure that all the DC and AC cables to the inverter are not live before you start
the electrical work.

Step 1 Strip off 7 mm insulation layer from all DC cables.

Step 2 Assemble cable ends with crimp contacts by crimping pliers.

Step 3 Lead cable through cable gland.

Step 4 Insert the crimp contact into the insulator until it snaps into

place. Then pull gently to check if it is correctly engaged.

Step 5 Screw the cable gland to front insulator with tightening

torque 2.5…3 Nm.

For further assembly and connection instruction, please visit the webpage of the
device manufacturer.

Step 6 Check the connection cable of PV string for the correct

polarity.

Step 7 Disconnect the DC switch.

Step 8 Configure PV configuration mode via jumper cables according to actual PV conditions. If parallel

PV configuration mode is selected, you should connect DC1+ to DC2+ and DC1- to DC2- on the DC
connection circuit board with jumper cables of cross-section not less than 6 mm² (10 AWG) as the
diagram shows. The existing cable connections are not displayed in the diagram.

27

Step 9 Plug the positive and negative DC connectors into PV

terminals underneath the connection cabinet until it locks
clicking into place

Step 10 Connect other PV strings following the above-mentioned

procedures.

Step 11 Seal the unused DC terminals with MC4 compatible

terminal caps.

6.5 Grounding the Inverter

Because of the transformer-less design of the inverter, the DC positive pole and DC
negative pole of the PV arrays are not permitted to be grounded.

6.5.1 Grounding System Overview

All non-current carrying exposed metal parts of the equipment and other enclosures in the PV power system
should be grounded (e.g., PV arrays frame and inverter enclosure).

Where there is only one inverter in the PV power system, connect “PE” cable to the installation ground.

Where there are multiple inverters in the PV power system, connect “PE” cables of all inverters and mounting
frame of PV arrays to the same copper bus bar. In this way, it will establish equipotential connection.

28

Fig. 6-3 Grounding for Inverter

6.5.2 Second Protective Earth Terminal

The inverter is equipped with second protective earth terminal in accordance with EN 50178.

Second PE Terminal

There is a second PE terminal on one side of the inverter, for PE connection.

Fig. 6-4 Second PE Terminal

Second PE Connection

Fig. 6-5 Connection of the Second PE Connection

*The connection parts are not included in the scope of delivery.

Item Description Remark

A Screw M4×12mm

B Lock washer -

C Washer -

D Cable socket -

E Yellow-green cable 6 mm² (9AWG)

29

6.6 Communication Connection

6.6.1 Communication Overview

The inverter operation information can be transferred via its integrated RS485 interface to a PC or to data
logging device.

RS485 is the standard communication choice for inverter.

There are communication terminals (RS485) at the bottom of the inverter. And there apply two optional
connection terminals on the configuration circuit board: RS485 A/B terminal blocks and RJ45 plug in
terminals.

If a terminating resistor is necessary switch on the 120 Ω terminating resistor switch. A terminating resistor
will be connected between the communication cables of the inverter.

Fig. 6-6 Communication related devices on the Configuration Circuit Board

Before communication connection, prepare communication cable and RJ45 plug.

RS485 cable requirements to ensure quality of communication:

 Twist-pair type cable

 Twist-pair type shielding Ethernet cable

A converter such as RS485-232 converter, which converts 485 to 232 signal, is
needed between inverter and PC.

6.6.2 Communication System

For Single Inverter

Where there is only one inverter, a RS485 cable enables connection between inverter and data logging device.

* Resistor necessary if not included in the end device

30

Communication Connection (RS 485 A/B bus or RJ 45)

Inverter

RS 485 A/B bus RJ 45

Terminating Resistor

Single one

Only out.

Only out.

Yes

For Multiple Inverters

Where there is more than one inverter, all inverters can be connected to data logging device in daisy chain.
The first and last inverters in the chain must be terminated with a resistor of 120 Ω. The shielding layer of
RS485 cable should be single-point grounded.

The maximum number of inverters connected in the daisy chain depends on converter, data logging device
and other factors. Please refer to the manual of the converter or data logging device.

* Resistor necessary if not included in the end device

Communication Connection (RS 485 A/B bus or RJ 45)

Inverter

RS 485 A/B bus RJ 45

Terminating
Resistor

Inverter 1

Only out

Only out

Yes

Inverter 2…n-1

In and Out

In and Out

No

Inverter n (with
Data Logging
Device)

In and Out

In and Out

No

31

Inverter n (without
Data Logging
Device)

Only in

Only in

Yes

6.6.3 RS485 Communication Connection

RS485A/B Bus Connection

Step 1 Lead shielding RS485 twist-pair type cable through communication cable gland to the

configuration circuit board.

Step 2 Trip off the insulating layer of the communication cables. Connect the cables to the RS 485 bus

terminal blocks.

Step 3 According to the position of the inverter (refer to the prior section), repeat step 1…2 to connect

the other RS485 cables.

Step 4 Pull cables outwards to confirm whether they are fastened firmly.

Step 5 According to the position of the inverter (refer to the prior section) switch ON or OFF the

terminating resistor.

Step 6 Tighten the tread-lock sealing lock. Block off the vacant terminals to protect the inverter’s internal

from dust and moisture.

Step 7 If there is no other connection procedure, recover and fix the front cover of the connection

cabinet.

Step 8 Now perform RS485 communication connection as the diagram shown above. Connect the other

end of cable to other devices. Communication terminal definition is referred to device manual.

Step 9 Verify the communication connection and configure the communication parameters.

If there is more than one inverter to communicate with a PC or a data logger, it is
crucial to configure the communication parameters of each inverter. See “10.12
Communication Parameters Setting”.

Data logging Device and RS485-232 converter are optional parts.

32

RJ45 Connection

Step 1 Lead shielding Ethernet cable through communication cable gland to the configuration circuit

board.

Step 2 Use the Ethernet crimper to crimp the cables and connect cables to RJ45 plug according to TIA/EIA

568B.

Step 3 Connect the RJ45 plug into the RS485 in/RS485 out terminal on the configuration circuit board.

Step 4 According to the position of the inverter (refer to the prior section), repeat step1…3 to connect the

other RS 485 Ethernet cables to the RS485 out/RS485 in terminal on the configuration circuit board.

Step 5 Pull cables outwards to confirm whether they are fastened firmly.

Step 6 Tighten the tread-lock sealing lock. Block off the vacant terminals to protect the inverter from

internal dust and moisture.

Step 7 According to the position of the inverter (refer to the prior section) switch ON or OFF the terminating

resistor.

Step 8 If there is no other connection procedure, recover and fix the front cover of the connection cabinet.

Step 9 As for the wires which connect to the logging devices, use the Ethernet wire stripper to strip the

insulation layer and connect the RS485 A and B cables (3 and 6) to data logging device or RS 485-232
converter. Communication terminal definition is referred to the device manual.

Step 10 Verify the communication connection and configure the communication parameters.

If there is more than one inverter to communicate with a PC or a data logger, it is
crucial to configure the communication parameters of each inverter. See “10.12
Communication Parameters Setting”.

Data logging Device and RS485-232 converter are optional parts.

33

7 Commissioning

Commissioning is a critical part for a well-installed PV system, which can protect against fires, injury and
electrical shock.

7.1 Inspection before Commissioning

Before starting the inverter, you should check the following items should be checked for requirements.

1. Inverter unit is accessible for operation, maintenance and service.

2. Re-check that the inverter is firmly installed onto the wall.

3. Space for ventilation is well provided for one or more inverters.

4. Nothing is left on the top of the inverter unit.

5. Inverter and accessories are correctly connected.

6. Cables are routed in safe place or protected against mechanical damage.

7. Specification of AC circuit breaker is reasonable.

8. Terminals not used underneath the inverter are sealed.

9. Warning signs & labels are suitably affixed and durable.

7.2 Commissioning Procedure

If all checking items mentioned above meet the requirements, follow the next procedures to start up the
inverter for the first time.

At chapter”10.1 Description of Button Function”, there are described the multiple functions of the buttons.

Step 1 Close external AC circuit breaker.

Step 2 Rotate DC switch to “ON” position.

Suppose there are sufficient sunlight and enough DC power. PV
arrays initialize and supply DC power to inverter. The LCD display is
activated to check the validity first. If there is a defect on the
display, contact Sunways.

Step 3 Language selection screen will appear. Perform language settings

with the right two buttons. Detailed button functions can be
referred to “10.1 Description of Button Function”. Press ▼ to
choose language. Confirm the settings by Pressing OK.

Step 4 Configure time according to the local time. Time setting is very

important, which directly affects data logging. Press ► to move
cursor and Press ▼ to scroll up time value. Confirm the settings by
Pressing OK.

Step 5 Select the country code according to the installation country of the

inverter. Each country code represents corresponding local
protective parameters that have been preset before delivery.
Before country setting, there is warning screen.

34

Step 6 Press ▼ to choose country code. Confirm the settings by Pressing

OK.

Refer to “10.11 Protective Parameters Setting” for country code explanation. If the inverter is installed where
the country code is not included, please choose item “Other” and manually set the protective parameters.

If the country code is not set correctly during commissioning, reset the protective
parameters as explained in “10.11 Protective Parameters Setting”. There may be
faults if otherwise.

Step 7 Configure grid code on the display. Press ▼ to select grid code.

Confirm the selection by Pressing OK. Where, LV indicates Low
Voltage Grid Code; MV indicates Middle Voltage Grid Code.

Step 8 When choose MV, Press ► to enter the LVRT function selection,

Press ▼ to switch on or off the LVRT function and Press OK to
confirm the selection.

If the Country selected does not have the “Grid codes” directives, this configuration
will not affect the following procedures.

However, you may select the MV to enable/disable the LVRT function regardless of
the country selected

Step 9 After configuring the Grid Code, there will be a “Pro-param” type

selection screen and then corresponding sub-menu will come up. For
detailed information, please refer to “10.11 Protective Parameters
Setting”.

Step 10 After configuring all parameters, there will be a “setting

confirmation” screen. Check whether all above-mentioned
parameters are correct.Confirm by Pressing OK. Cancel by Pressing
ESC and reset.

Step 11 Step 11 Inverter will enter into startup process. Observe status of

LED indicators and the LCD main screen. If inverter‘s commissioning
succeeds, the “RUN” indicator will be lit and “RUN” will be displayed
on the “State” area

If inverter commissioning fails, the “FAULT” indicator will be lit and “fault” will occur on the display. Press ▼
to view “current fault” information. Remove the existing malfunction and then repeat starting up inverter as
the above procedures.

35

8 Disconnecting, Dismantling and Disposing the Inverter

8.1 Disconnecting the Inverter

For maintenance work or any service work, inverter must be switched off. In normal operation, switching off
is not necessary.

In order to disconnect the inverter from the AC and DC power sources, you should proceed with the following
procedures. Otherwise you will be exposed to lethal voltages or the inverter will be damaged.

1. Disconnect the external AC circuit breaker and prevent it from connecting again.

2. Turn off the upstream DC circuit break or cover the PV arrays with opaque materials. Rotate DC switch

at the side of inverter to the “OFF” position.

Please strictly follow the sequence of the above procedures. Otherwise it will lead
to unrecoverable inverter damage.

3. Wait about ten minutes until the capacitors inside the inverter have discharged.

4. Loose the six screws on the lower connection cabinet and then remove the lid.

5. Measure AC voltage to ground at the AC terminal to confirm AC output of inverter at the AC circuit

breaker is voltage free.

6. Loose screws to remove AC cables.

7. Disconnect DC cables from the inverters.

8.2 Dismantling the Inverter

Refer to Chapter 5 and Chapter 6 to dismantle the inverter in reverse steps.

If the inverter will be reinstalled in the future, please refer to “4.4 Storage of
Inverter” for a proper conservation.

8.3 Disposing the Inverter

Users should take the responsibility for the disposal of the inverter.

Some parts and devices in the inverter, such as LCD display, batteries, capacitors,
may cause environment pollution. Users must comply with the related local
regulations to avoid causing pollution.

36

9 Troubleshooting and Maintenance

9.1 Troubleshooting

9.1.1 Troubleshooting of LED Indicator

See “Table 2-1 LCD Display Panel Description” for definition of LED states.

Type of fault Troubleshooting

LED indicators
and LCD screen
cannot be lit

1. Disconnect AC side circuit breaker.

2. Rotate DC switch to the “OFF” position.

3. Check the polarity of DC input.

“RUN” indicator
goes out

1. Disconnect AC side circuit breaker.

2. Rotate DC switch to the “OFF” position.

3. Check the correctness of electrical connection of inverter. See “6 Electrical
Connection”.

4. Check whether DC input voltage exceeds the inverter start voltage of inverter.

5. If all above conditions are OK, please contact with Sunways Technical Hotline.

“Fault” indicator
is lit

1. A fault is not removed yet.

2. Perform troubleshooting in according to fault type in LCD screen. See “9.1.2
Troubleshooting of Faults in LCD Screen”.

3. If it cannot be solved, please contact Sunways Technical Hotline.

9.1.2 Troubleshooting of Faults in LCD Screen

When faults occur, “Fault” state will be shown on the main screen. Press ▼ to view multiple “current fault”
information pages.

Fault Code Description Troubleshooting

0002

The grid voltage has
exceeded inverter
allowable upper limit.

1. Check the grid voltage.

2. If the grid voltage exceeds the permissible range of inverter
protective parameters, ask utility grid company for solution.

3. If the grid voltage is within the permissible range, contact the
Technical Hotline

0003

Inverter has checked
that the
instantaneous sample
value of the grid
voltage exceeds the
allowable limit for
some time.

1. This is a short-term fault due to grid condition. Wait a moment
for inverter recovery.

2. If the fault remains, please contact the Technical Hotline

0004

The grid voltage has
fallen below inverter’s
allowable lower limit.

1. Check the grid voltage.

2. If the grid voltage exceeds the permissible range of inverter
protective parameters, ask utility grid company for solution.

3. If the grid voltage is within the permissible range, contact the
Technical Hotline

0005

The grid voltage is too
low.

1. This is a short-term fault due to grid condition. Wait a moment
for inverter recovery.

2. If the fault remains, please contact the Technical Hotline

37

Fault Code Description Troubleshooting

0006

The AC output current
exceeds inverter
protective limit.

1. The inverter will resume if the output current falls below the
protective value.

2. If the fault remains, please contact the Technical Hotline

0007

Inverter has checked
AC overcurrent
temporarily.

The inverter will self-recover after a few seconds.

0008

The grid frequency
has exceeded inverter
allowable upper limit.

0009

The grid frequency
has fallen below
inverter allowable
lower limit.

1. Check the grid frequency.

2. If the grid frequency exceeds the permissible range of inverter
protective parameters, ask utility grid company for solution.

3. If the grid frequency is within the permissible range, contact the
Technical Hotline

0010 Islanding

1. Check whether AC circuit breaker is triggered.

2. Check whether AC cables are all firmly connected.

3. Check whether grid is not on service.

4. If all conditions are OK and this malfunction still occurs in the
LCD screen, contact the Technical Hotline

0011

The DC component of
AC current has
exceeded inverter
limit.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0012

Inverter has detected
that there is a failure
current.

1. Check the PV strings for ground fault.

2. If the fault occurs repeatedly, contact the Technical Hotline

0013

Inverter has checked
that the grid is
abnormal

1. Wait a moment for grid recovery.

2. If the grid parameters exceed the permissible range of inverter
protective parameters, ask utility grid company for solution.

3. If the grid frequency is within the permissible range, contact the
Technical Hotline

0014

The average grid
voltage over 10
minutes is not within
the permissible range.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0015

Grid impedance has
exceeded inverter
limit

1. Check AC cables for appropriate size.

2. Wait a moment for inverter recovery.

3. If the fault occurs repeatedly, contact the Technical Hotline

0016

The AC output
overloads.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0017

The inverter has
checked that there is
unbalance between
the three phase
voltages.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0019

The bus voltage is
temporarily high.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0020

The bus voltage is
high.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

38

Fault Code Description Troubleshooting

0021

Inverter has checked
that there is
overcurrent of PV1
input.

Check the layout and the wiring of PV1 input.

0022

Inverter has checked
that there is
overcurrent of PV2
input.

Check the layout and the wiring of PV2 input.

0023

PV configuration
mode has changed
during inverter
running.

Check the PV input configuration mode and restart the inverter
when necessary.

0024

Inverter has checked
the deviation of
neutral point voltage.

1. Inverter will recover if the deviation value falls below the
protective limit.

2. If the fault occurs repeatedly, contact the Technical Hotline

0025

Inverter has checked
out the unbalance of
neutral point voltage
temporarily.

1. Inverter will recover if the deviation value falls below the
protective limit.

2. If the fault occurs repeatedly, contact the Technical Hotline

0026

There is high Bus
fluctuation voltage.

1. This is a short-term fault. Wait a moment for inverter recovery.

2. If the fault still exists, please contact the Technical Hotline

0027

The DC current is not
balanced between the
two PV inputs for
parallel PV
configuration mode.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0028

Inverter has checked
the reverse polarity of
PV connection.

1. Disconnect inverter.

2. Reconnect PV strings.

0036

The temperature of
module is too high

0037

The ambient
temperature is too
high

1. Check whether AC output power exceeds norminal power too
much.

2. Check whether fans work normally and whether there are some
abnormal fans. Please replace broken fan, in necessary.

3. Clean air grills of outlet.

4. If the fault still exists, please contact the Technical Hotline

0038

The inverter has
checked that there is a
fault of relay.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0039

The insulation
resistance is low.
(ISO-flt)

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0040 IGBT saturation

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0041

There is a fault with
sampling channel.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0042 Current imbalance. If the fault occurs repeatedly, contact the Technical Hotline

0043

The ambient
temperature falls
below -25°C

Disconnect inverter to stop. Wait for ambient temperature to rise
above -25°C and then start inverter again.

39

Fault Code Description Troubleshooting

0044

There is a fault with
DC/AC inversion
circuit

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0045

There is a fault with
PV1 boost circuit.

0046

There is a fault with
PV2 boost circuit.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0047

The PV configuration
mode set on the
display is not in
accordance with the
configuration in the
connection cabinet.

1. Disconnect inverter.

2. Re-select PV configuration mode and re-connect PV strings. For
more detailed information please refer to “6.4 Connecting
Inverter to PV Arrays”.

0048

Phase-R current
sampling channel
fault.

0049

Phase-S current
sampling channel
fault.

0050

Phase-T current
sampling channel
fault.

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0051

Hardware
Overvoltage/
Overcurrent
protection

1. Wait a moment for inverter recovery.

2. If the fault occurs repeatedly, contact the Technical Hotline

0070 Fans are defective. Disconnect inverter and remove the broken fan.

0072 Fault with DC SPD It is necessary to replace the DC SPD. Contact the Technical Hotline

0073 Fuse has blown out

Disconnect inverter and replace the fuses. Contact the Technical
Hotline

0074

Communication fault
of LCD

A fault has occurred in the internal communication of the
inverter. However, the inverter continues feeding into the grid.
Contact the Technical Hotline

0075

Solar irradiation is not
sufficient for inverter
operation.

Wait for higher irradiation.

If this recurs at medium irradiation, check the PV system design
and correct the connection of PV inputs.

0076 PV1 overload

Check the PV system design and correct the connection of PV1
inputs.

0077 PV2 overload

Check the PV system design and correct the connection of PV2
inputs.

40

9.2 Maintenance

9.2.1 Routine Maintenance

Items Methods Period

Save data

Save the running data, parameters and log to a disk or a
file.

Refer to the manuals of the data logging devices.

Once a month

General state
of system

Visual check any damage or deformation of the inverter.

Check any abnormal noise during the running of the
inverter.

Check each parameter of inverter operation.

Check if the temperature of the housing is normal. Monitor
the system using the thermal imager.

Every 6 months

System clean

Check the temperature and dust of the inverter. Clean the
inverter enclosure.

Check the humidity and dust of the environment.
Meanwhile check whether the filter function of the air
inlet is ok. Clean the air inlet and outlet, when necessary.

Six months to a year (it
depends on the dust
contents in air.)

Electrical
connection

Check whether cable connections are loose. Tighten the
loose connections.

Check whether there is injury in the cables, especially the
surface in contact with metal.

Check whether the wrap belt of the connection terminals is
strip-off.

Six months after
commissioning and then
once or twice a year.

Fans

Check whether there is crack of the fan blade

Check whether there is any abnormal noise of the fan
turning.

Clean or replace the fans.

Once a year

Devices check

Check the fuses and the DC SPD.

Replace the fuse.

Contact Sunways to order new DC SPDs.

Every 6 months

Safety
function

Check the LCD stop and emergency stop circuit of the
system.

Simulate shutdown and check stop signal communication.

Check the warning labels, and replace them if necessary.

Once or twice a year

Software

Software optimization.

Check the setting of every parameter.

Once or twice a year

41

9.2.2 Maintenance Instruction

Fan Maintenance

There are four fans at the side of the inverter for active cooling during running operation. If the fans are dirty
or out of work, the inverter may not be cooled down well and its efficiency may accordingly decrease.
Therefore it is necessary to clean the dirty fans or replace the broken fans as the following indications.

 Disconnect the inverter from the grid first and then PV arrays before

any maintenance work.

 Lethal voltage still exists in the inverter. Wait for at least ten minutes

and then perform the maintenance work.

 Fans maintenance work may only be performed by qualified

electricians.

1. Disconnect the AC circuit breaker.

2. Turn off the upstream DC circuit break or cover the PV arrays with opaque materials. Rotate DC switch

at the side of inverter to the “OFF” position.

3. Wait for at least ten minutes.

4. Disconnect all electrical connection in the reverse procedures in the “6 Electrical Connection”.

5. Lift up the inverter over the backplate with the help of others and then remove it from the wall.

6. Place the inverter onto the platform.

7. Loosen the screws as the right diagram shown.

8. Disassemble the metal plate slightly.

9. Release the locking part of four connectors by pressing on the

ribbing of the locking hooks and pull outwards.

42

10. Remove fans from the inverter.

11. Clean the dirty fans with soft brush or vacuum cleaner. Replace the broken fans if necessary.

12. Re-assemble the fans onto the inverter.

13. Connect the four connectors and fasten them with cable ties.

14. Assemble the plate by fastening the four screws.

15. The inverter can be work again.

Replacing the String Fuses

In case of damage, it is necessary to replace the blown string fuses due to overcurrent. Proceed as follows:

1. Disconnect AC circuit breaker.

2. Turn off the upstream DC circuit break or cover the PV arrays with opaque materials. Rotate DC switch

at the side of inverter to the “OFF” position.

3. Wait for at least ten minutes.

4. Disconnect the DC cables from the inverter.

5. Open the inverter as described in section “8 Disconnecting, Dismantling and Disposing the Inverter”.

6. Observe the string fuse assignment and check the fuse conductivity using the multimeter. A

non-conductive fuse indicates a fault in the affected string.

7. Have the installer of the PV generator check the affected string and order the fuse for the defective

string fuse of the same specification from Sunways.

8. Remove the blown string fuse.

9. Insert the new fuse into the fuse holder.

10. Close the inverter and startup the inverter again.

Clean Air Inlet and Outlet

A huge amount of heat is generated with the running of the inverter. The inverter adopts a controlled
forced-air cooling method. Check whether there is anything blocking the air inlet and outlet to maintain
good ventilation. Clean the air inlet and outlet with soft brush or vacuum cleaner if necessary.

43

9.3 Contact Sunways Service

Should you have any problems in operating on the inverter, please contact us:

Sunways Technical Hotline:

Telephone [phone]

Telefax + 49 (0)7531 996 77-444

www.sunways.eu

www.sunways.eu/en/service/technical-hotline/

We need the following information to provide you the best assistance:

 Type of the inverter

 Serial number of the inverter

 Fault code/name

 Brief description of the problem

44

10 Operation of LCD Display

10.1 Description of Button Function

Inverter offers two buttons for the user to look up the running information and configure parameters
settings. The two buttons have multiple functions. Please refer to Table 10-1 before any operation onto
inverter.

Button Operation Description

Press less than two seconds

Move upwards or downwards, or increase setting value.
Hereinafter, it is referred to as “Press ▼”.

▼esc

Press more than two seconds

Return to the previous menu or cancel the command.
Hereinafter, it is referred to as “Press ESC”.

Press less than two seconds

Move left or right, or turn pages. Hereinafter, it is referred to as
“Press ►”.

►ok

Press more than two seconds

Enter into the sub-screen or confirm the command. Hereinafter,
it is referred to as “Press OK”.

Table 10-1 Button Function

The background illumination of the LCD screen will go out to save power if there is
no button operation for one minute. Reactivate it by pressing any button.

45

10.2 Inverter Menu Structure

Fig. 10-1 Menu Tree-English

46

10.3 Main Screen

If the inverter succeeds in commissioning, LCD display will enter into the main screen, as shown in Fig. 10-2.

Fig. 10-2 Main Screen Description

No. Description

1 Power curve. x-axis: time in hours; y-axis: output power yield P in %.

2 Icons (refer to the Table 10-3) and the Inverter active power limits (P-W limits).

3 Current output power.

4 Energy generation at present day.

5 Total energy generation since initial commissioning.

6 Inverter state.

7 Date (year/month/date) and time.

Inverter State Description

Run

After being energized, the inverter tracks the maximum power point (MPP) of the PV
arrays and feeds AC power to grid. This mode is the normal mode.

Standby

Inverter will enter into Standby mode for insufficient input power. In this mode the
inverter will wait until the DC voltage recovers.

Stop The inverter is shut down.

Key-stop The inverter will stop operation by manual “Stop” through LCD menu.

Start… The inverter is initializing and synchronizing with the grid.

Upd fail IAP (In Application Programming) update fails

Fault

If a fault occurs, the inverter will automatically stop operation, trigger the AC relay and
show “Fault” on the LCD with the “FAULT” indicator lit.

Once the fault is removed in recovery time (set by user, see “10.10 Running Parameters
Setting”), the inverter will automatically resume running.

Warning Inverter has checked out some warning information.

Table 10-2 Inverter State Description

If inverter is in “Fault” state, Press ► /▼ to view multiple “Current fault” information pages. To know the
meaning of the fault code, please refer to “9.1.2 Troubleshooting of Faults in LCD Screen”

47

Icon Description

Inverter is in IAP (In Application Programming) update process.

Inverter in power reduction state.

Fans inside are working.

Inverter is warning the running state.

Table 10-3 Icon Description

10.4 Adjust Contrast

Press ESC to enter into the contrast adjustment screen.

Press ▼ to increase the setting value and press ► to decrease the value.

Press OK to confirm the contrast setting.

The contrast value ranges from 0 to 100. The recommended value is 50 or 60.

10.5 Detailed Running Information

On the main screen, there is some basic information about the inverter. For more detailed running
information, plase operate as follows.

Main Screen (Press OK) →Menu→ Run-info (Press OK)

LCD screen will show four detailed running information pages. Scroll pages by pressing ► /▼.

“DC power input” represents the total input power of PV1 and PV2.

“Vdc” indicates the DC voltage of each input.

“Idc” indicates the DC current of each input.

“Pdc” indicates the DC power of each input.

“Indep / Paral mode” is the PV configuration mode of the two PV inputs.

√

indicates the corresponding input is at work.

√ √

“P-W” is inverter output active power.

“S-Va” is inverter output apparent power.

“Country” is inverter selected country code.

“Grid code” is inverter selected grid code.

“Vac” is phase voltage.

“Iac” is phase current.

“Pac” is AC output of each phase.

“F” is frequency of each phase.

48

“CO2-reduce” indicates total CO2 emission reduction due to the inverter..

“E-month” is the energy generation in this month.

“h-Total” is the total running hours of the inverter.

“T-today” is today running time of the inverter.

“Temp” is the internal temperature of the inverter.

10.6 History Records

10.6.1 Running Information Records

Main Screen (Press OK) →Menu (Press ▼) → His-record (Press OK) →Run-record (Press OK)

On the “Run-record” display, press ▼ to
select the date (number of the running
records) you want to view. Confirm by
pressing OK.

Inverter shows historical running
information pages. Scroll pages by
pressing▼. Change to the next record by
pressing►.

10.6.2 Fault Records

Main Screen (Press OK) →Menu (Press ▼) → His-record (Press OK, Press ▼) →Flt-record (Press OK)

Inverter shows fault record pages. Scroll pages by pressing ▼.

The inverter can only store at most 10 latest fault records.

49

10.7 Start and Stop Inverter

Main Screen (Press OK) →Menu (Press ▼×2) → Start/Stop (Press OK)

Press ▼ to choose “Start”/”Stop” and press OK to

confirm the choice.

Press OK to confirm.

10.8 Input Parameter Settings Password

The parameter settings are protected by the password. If you want to set the inverter’s parameters, you have
to input the correct password.

1. Press OK to enter into “Menu” screen.

2. Press ▼ to move the cursor to “Set-param” menu item and confirm by pressing OK.

3. A password confirmation screen will occur. Press ► to move cursor

right and Press ▼ to input the password 111111.

4. Press OK to confirm the password and enter the “Set-param” sub

menu.

50

10.9 System Parameters Setting

10.9.1 Language Setting

The inverter supports five languages: English, German, French, Italian and Chinese. Language can be
configured as the following indication.

Main Screen (Press OK) →Menu screen (Press ▼×3) → Set-param (Press OK) →enter password (Press OK)
→Sys-param (Press OK)→ Language (Press OK)

Press ▼ to select language as you prefer and confirm it by pressing OK.

10.9.2 Time Setting

If there is deviation between the time on inverter main screen and your local time, you should perform the
operation time setting. Otherwise the inverter data logging will fail. Clock is 24-hour format.

Main Screen (Press OK) → Menu screen (Press ▼×3) → Set-param (Press OK) → enter password (Press OK)
→Sys-param (Press OK, Press ▼) →Time (Press OK)

On the “Time” screen, Press ► to move the cursor right and Press ▼ to
set the correct date and time.

Confirm settings by pressing OK.

10.9.3 Energy Deviation Adjustment

If the accumulative value of “E-total” in the inverter is different from the value in the external metering
device, you should adjust the “Energy-adj” setting.

Main Screen (Press OK) → Menu screen (Press ▼ ×3) → Set-param (Press OK) → enter password (Press OK) →
Sys-param (Press OK, Press ▼×2) → Energy-adj (Press OK)

On the “Energy-adj” screen, Press ► to move cursor right and Press ▼ to
set the correct offset value.

Confirm settings by pressing OK.

The positive symbol “+” can be changed to the negative symbol “-”.

The adjustment range is from -9999 to +9999 kWh.

(Energy-adj value)= (Real measured value)-(E-tot reading value).

10.9.4 Load Default

All history accumulated information will be unrecoverable cleared and all
parameters will return to the default value except the protective parameters and
time, once the “load default” operation is performed.

51

Main Screen (Press OK) → Menu screen (Press ▼ ×3) → Set-param (Press OK) → enter password (Press OK) →
Sys-param (Press OK, Press ▼×3) → Load default (Press OK)

A password confirmation screen will occur. Press ► to move cursor right
and Press ▼ to input the password 111111.

Press OK to confirm “load default”.

10.9.5 Firmware Version

Main Screen (Press OK) → Menu screen (Press ▼ ×3) → Set-param (Press OK) → enter password (Press OK)
→ Sys-param (Press OK, Press ▼×4) → Firmware version (Press OK)

Inverter shows detailed firmware information, including LCD version
and DSP version.

The firmware version information is read only.

10.10 Running Parameters Setting

10.10.1 Main Menu of Run-param

Main Screen (Press OK) → Menu screen (Press ▼ ×3) → Set-param (Press OK) → enter password (Press OK,
Press ▼) → Run-param (Press OK)

On the “Run-param” screen, Press ▼ to move arrow to one item and
Press OK to start this item setting.

For each item setting, Press ► to move cursor right and Press ▼ to set
the appropriate value.

Confirm by Pressing OK.

Parameter Explanation Default Range

Standby
time

The time from inverter initialization to inverter
feeding power to grid.

20 s 20…255s

Recover
time

The time from the fault is cleared to inverter
feeding power to grid.

30 s

[IT: 300 s]

0…900 s

P-W limits Inverter active power limits. 100.0% 0...100%

Q-Var
switch

Whether to start inverter reactive power
adjustment function.

[Pf]

[Pf] / [Qt] / [Off] / [Q(P)] /
[Q(U)]

PF Power factor +1.000

-1.000…-0.900 /
+0.900…+1.000

52

Q-Var
limits

Inverter reactive power limits 0.0% 0...+100% / 0…-100%

Derating
Slope*

Over-frequency power derating slope (Pm/Hz)

Only available when the country selected is “IT”.

83.33% 40%...100%

Table 10-4 Specification of Running Parameters

10.10.2 Reactive Power Regulation

The inverter provides reactive power regulation function. Use the “Q-Var switch” parameter to activate this
function and select proper regulation mode.

Mode Explanation

Pf The reactive power can be regulated by the parameter

PF (Power Factor)

.

Qt The reactive power can be regulated by the parameter

Q-Var limits

(in %).

Off ThePFis limited to +1.000, and the

Q-Var limits

is limited to 0.0%.

Q(P) The PF changes with the output power of the inverter.

Q(U) The reactive power changes with the grid voltage.

“Pf” Mode

The reactive power can be regulated by the parameter PF on the Run-param screen.

“Qt” Mode

The reactive power can be regulated by the parameter Q-Var limits (in %) on the Run-param screen.

“Off” Mode

The PF is limited to +1.000, and the Q-Var limit is limited to 0.0%.

“Q(P)” Mode (when the country selection is not “IT”)

The PF changes with the inverter output power.

If the country selection is not “IT” (Italy), after selecting Q(P) Mode,
Press ▼ to enter the Run-param-Q(P) sub-menu.

For each item setting, Press ► to move cursor right and Press ▼ to set
the appropriate value. Confirm settings by pressing OK.

Parameter Explanation Default Range

Upper PF Cap Power factor of point P1 in the Q(P) mode curve 1 0.9…1

Lower Power* Output power of point P1 in the Q(P) mode curve (in %) 50% 0%...50%

Lower PF Ind Power factor of point P2 in the Q(P) mode curve 0.9 0.9…1

Upper Power* Output power of point P2 in the Q(P) mode curve (in %) 100% 50%...100%

*Lower Power <Upper Power

53

Fig. 10-3 Reactive Power Regulation Curve in Q(P) Mode

“Q(U)” Mode (when the country selection is not “IT”)

The reactive power ratio changes with the grid voltage.

If the country selection is not “IT” (Italy), after selecting Q(U) mode, Press ▼ to
enter the Run-param-Q(U) sub-menu.

For each item setting, Press ► to move cursor right and Press ▼ to set the
appropriate value.

Confirm settings by Pressing OK.

Parameter Explanation Default Range

Lower Q/Sn Ind

Inductive Q/Sn value of point P4 in the Q(U) mode
curve

25% 0%...50%

Upper Q/Sn Cap

Capacitive Q/Sn value of point P1 in the Q(U) mode
curve

25% 0%...50%

Lower U Limit

Grid voltage limit (in %) of point P1 in the Q(U) mode
curve

80% 80%...90%

Upper U Limit

Grid voltage limit (in %) of point P4 in the Q(U) mode
curve

115% 110%...115%

U1 Limit*

Grid voltage limit (in %) of point P2 in the Q(U) mode
curve

95% 95%...100%

U2 Limit*

Grid voltage limit (in %) of point P3 in the Q(U) mode
curve

105% 100%...105%

Hysteresis* Hysteresis voltage width (in %) 3% 0%...5%

*U1 Limit + Hysteresis < U2 Limit - Hysteresis

54

Fig. 10-4 Reactive Power Regulation Curve in Q(U) Mode

10.10.3 Save P/Q-set

On the “Save P/Q-set” screen, Press ▼ to move arrow to one item, Press ► to
move cursor right and Press ▼ to set.

Confirm by Pressing OK.

Select “Y” to save up the values set when power down.

Select “N” to restore default values when power down.

10.11 Protective Parameters Setting

Protective parameters are designed for the limit value that can trigger the protective functions of the
inverter.

Main Screen (Press OK) → Menu screen (Press ▼ ×3) → Set-param (Press OK) → enter password (Press OK,
Press ▼×2) → Pro-param (Press OK)

A password confirmation screen will occur. Press ► to move cursor right and
Press ▼ to input the password. Please enquire Sunways or your dealer for this
password.

To make protective parameters setting convenient, Inverter provides country
code selection. The protective parameters have been configured before
delivery according to different countries utility grid requirements. Choose the
correct country code by Press ▼ and Press OK to confirm.

55

The description of country code is illustrated below:

Country Code Full Name Country Code Full Name

GB Great Britain DE Germany

FR France IT Italy

ES Spain AT Austria

AU Australia CZ Czech

BE Belgium DK Denmark

GR_L Greece Land GR_IS Greece Island

NL Netherlands PT Portugal

CHN China SE Sweden

Other Country not included above - -

Confirm by pressing OK after country code selection. Choose grid code
according to actual grid condition.

Note: “LV” represents Low Voltage Grid Code, and “MV” represents Middle
Voltage Grid Code.

When choose MV, Press ► to enter the LVRT function selection, Press ▼ to
switch on or off the LVRT function and Press OK to confirm the selection.

Note: If the Country selected does not have the “Grid codes” directives, this
configuration will not affect the following procedures.

However, you may select the MV to enable/disable the LVRT function
regardless of the country selected.

Press ▼ to select protective parameter type. Press OK to confirm the selection.

If the country selection is “IT” (Italy), the Pro-param menu right will show.
Refer to the “10.13.3 Protective Parameters Setting for Italy” for detailed
settings.

Single-stage Protective Parameter (when the country selection is not “IT”)

If the selected protective parameter type is “Single-stage”, the following
sub-menu will come up.

Press ▼ to select parameter, Press ► to move cursor right and Press ▼ to set
the appropriate value. Confirm settings by Pressing OK.

56

Parameter Explanation

Max-V.grid Grid over-voltage value

Min-V.grid Grid under-voltage value

Max-Fgrid Grid over frequency value

Min-F.grid Grid under frequency value

Table 10-5 Single-stage Protective Parameter Explanation

Multi-stage Protective Parameter (when the country selection is not “IT”)

If the selected protective parameter type is
“Multi-stage”, the following sub-menus will
come up.

Press ▼ to select parameter, Press ► to move
cursor right and Press ▼ to set the appropriate
value. Confirm settings by Pressing OK.

Parameter Explanation

Max-V. prot Over-voltage protection

I-Max-V. grid Stage I Grid over-voltage

I-Max-V. time Stage I Grid over-voltage tripping time

II-Max-V. grid Stage II Grid over-voltage

II-Max-V. time Stage II Grid over-voltage tripping time

Min-V. prot Under-voltage protection

I-Min-V. grid Stage I Grid under-voltage

I-Min -V. time Stage I Grid under -voltage tripping time

II-Min -V. grid Stage II Grid under -voltage

II-Min -V. time Stage II Grid under -voltage tripping time

Max-F. prot Over-frequency protection

I-Max-F. grid Stage I Grid over-frequency

I-Max-F. time Stage I Grid over-frequency tripping time

II-Max-F. grid Stage II Grid over-frequency

II-Max-F. time Stage II Grid over-frequency tripping time

Min-F. prot Under-frequency protection

I-Min-F. grid Stage I Grid under-frequency

I-Min -F. time Stage I Grid under-frequency tripping time

II-Min -F. grid Stage II Grid under-frequency

II-Min -F. time Stage II Grid under-frequency tripping time

Table 10-6 Multi-stage Protective Parameter Explanation

57

Confirm settings by pressing OK and enter the “Setting confirmation”
screen.

Check all above-mentioned parameter settings. Confirm them by pressing
OK. Cancel by pressing ESC and reset.

When the Country or the Grid code or LVRT switch mode is changed, the protective
settings will be unavailable unless the inverter is re-energized.

10.12 Communication Parameters Setting

Main Screen (Press OK) → Menu screen (Press ▼ ×3) → Set-param (Press OK) → enter password (Press OK,
Press ▼×3) → Com-param (Press OK)

Press ► to move cursor right and Press ▼ to set the appropriate value.

Confirm settings by Pressing OK.

The range of communication address is 1...247.

10.13 Special Settings for Italy

If the “Countries” selection is “IT” (Italy), several LCD menus and operation methods are different from other
countries.

The differences focus on “Run-param” and “Pro-param” as shown below.

10.13.1 Over-frequency Derating Setting for Italy

If the “Countries” selection is “IT” (Italy), the “Derating Slope”* will display in the “Run-param” screen.

When the grid frequency is between 50.3 Hz and 51.5 Hz, inverter will decrease power according to the
“Derating Slope”.

Default derating slope (Pm/Hz, Pm is the power before derating): 83.33%. Range: 40% ...100%.

Note: “Derating Slope”* is the power derating slope. Power derating slope = 100 / (Grid frequency ×
Frequency derating slope). Frequency derating slope range: 2% ...5%.

Fig. 10-5 “IT” Over-frequency Derating Curve

58

10.13.2 Reactive Power Regulation for Italy

Button Operation

The button functions for Italy parameter setting sub-menus may differ from that in other menus.

Proceed as follows to perform the parameter settings.

Italy “Q(P)” Mode

The power factor changes with the output power of the inverter.

Select Q(P) mode and Press ▼ to enter into the “Run-para-Q(P)”
sub-menu.

Press ▼ to navigate the cursor; Press ► to enter into the editing
mode, then the selected parameter will be shaded.

Press ▼ to increase one-step value; Press ►to decrease one-step value.

Press OK to confirm the setting and exit from the editing mode.

Parameter Explanation Default Range Step

PA* Active power at point A (in %) 20% 20%…100% 1%

PB* Active power at point B (in %) 50% 20%…100% 1%

PC* Active power at point C (in %) 100% 20%…100% 1%

Pf max Power factor at point C 0.9 0.9…1 0.01

Uin**

Enter into the Q(P) regulation mode when the
grid voltage is above Uin

105% 100%...110% 1%

Uout**

Exit from the Q(P) regulation mode when the grid
voltage is below Uout

100% 90%...100% 1%

*PA < PB ≤ PC ** Uin >Uout

Table 10-7 Italy “Q(P)” Mode Parameters Explanation

59

Fig. 10-6 Reactive Power Regulation Curve in “IT” Q(P) Mode

Italy “Q(U)” Mode

The reactive power ratio changes with the grid voltage.

Select Q(U) mode and Press ▼ to enter into the “Run-para-Q(U)”
sub-menu.

Press ▼ to navigate the cursor; Press ► to enter into the editing mode,
then the selected parameter will be shaded.

Press ▼ to increase one-step value; Press ► to decrease one-step value.

Press OK to confirm the setting and exit from the editing mode.

Param. Explanation Default Range Step

V2i* Grid voltage at point D (in %) 90% 90%...110% 1%

V1i* Grid voltage at point C (in %) 92% 90%...110% 1%

V2s* Grid voltage at point A (in %) 108% 90%...110% 1%

V1s* Grid voltage at point B (in %) 110% 90%...110% 1%

Qmax The max. ratio of reactive power (in %) 90% 50%...100% 1%

Pin**

Enter into the Q(U) regulation mode when
the power is above Pin

20% 20%...100% 1%

Pout**

Exit from the Q(U) regulation mode when
the power is below Pout

9% 1%...20% 1%

Curve Curve type A A/B -

*V2i < V1i < V1s < V2s **Pin > Pout

Table 10-8 Italy “Q(U)” Mode Parameters Explanation

60

Fig. 10-7 Reactive Power Regulation Curve in “IT” Q(U) Mode

10.13.3 Protective Parameters Setting for Italy

If the “Countries” selection is “IT” (Italy), the protective parameters settings procedures are shown below.

After “Grid codes” selection, you may enter into the “Pro-param”
sub-menu.

Press ▼ to select parameter, Press ► to move cursor right and Press ▼
to set the appropriate value. Confirm settings by Pressing OK.

Parameter Explanation

Fmax recover

Inverter can start operating only when the grid frequency is below Fmax recovery.

The fault recovery value when the grid over-frequency occurs.

Fmin recover

Inverter can start operating only when the grid frequency is above Fmin recovery.

The fault recovery value when the grid under-frequency occurs.

Vmax recover

Inverter can start operating only when the grid voltage is below Vmax recover.

The fault recovery value when the grid over-voltage occurs.

Vmin recover

Inverter can start operating only when the grid voltage is above Vmin recover.

The fault recovery value when the grid under-voltage occurs.

Table 10-9 Italy Grid protection Recovery Value

“IT” Stage I Protective Parameter

If the selected protective parameter is “Pro-stage I”, the following
sub-menu will come up.

Press ▼ to select parameter, Press ► to move cursor right and Press ▼
to set the appropriate value. Confirm settings by Pressing OK.

Parameter Explanation Parameter Explanation

Max-V.grid Grid over-voltage value Max-Fgrid Grid over frequency value

Min-V.grid Grid under-voltage value Min-F.grid Grid under frequency value

Table 10-10 Stage I Protective Parameter Explanation

61

“IT” Stage II Protective Parameter

The button functions for Italy Stage II parameter setting sub-menus may differ from
that in other menus.

Proceed as follows to perform the parameter settings.

Select“Pro-stage II”and Press ▼ to enter
into the sub-menus.

Press ▼ to navigate the cursor; Press ►
to enter into the editing mode, then the
selected parameter will be shaded.

Press ▼ to increase one-step value; Press
► to decrease one-step value.

Press OK to confirm the setting and exit
from the editing mode.

Parameter Explanation

Max-V. prote Over-voltage protection

I-Max-V. rete Stage I Grid over-voltage

I-Max-V. tempo Stage I Grid over-voltage tripping time

II-Max-V. rete Stage II Grid over-voltage

II-Max-V. tempo Stage II Grid over-voltage tripping time

Min-V. prote Under-voltage protection

I-Min-V. rete Stage I Grid under-voltage

I-Min -V. tempo Stage I Grid under -voltage tripping time

II-Min -V. rete Stage II Grid under -voltage

II-Min -V. tempo Stage II Grid under -voltage tripping time

Max-F. prote Over-frequency protection

I-Max-F. rete Stage I Grid over-frequency

I-Max-F. tempo Stage I Grid over-frequency tripping time

II-Max-F. rete Stage II Grid over-frequency

II-Max-F. tempo Stage II Grid over-frequency tripping time

62

Min-F. prote Under-frequency protection

I-Min-F. rete Stage I Grid under-frequency

I-Min -F. tempo Stage I Grid under-frequency tripping time

II-Min -F. rete Stage II Grid under-frequency

II-Min -F. tempo Stage II Grid under-frequency tripping time

Table 10-11 “IT”Stage II Protective Parameters Explanation

63

11 Appendix

11.1 Technical Data

Parameters ST 30

Input Side Data

Max. PV input power 32000 W

Max. PV input voltage 1000 V

Startup voltage 300 V

Nominal input voltage 650 V

MPP voltage range 280…950 V

MPP voltage range for nominal power 480...800 V

No. of MPPT 2

Max. number of PV strings per MPPT 5

Max. PV input current 66 A (33 A / 33 A)

Max. input current for input connector 10 A

Short-circuit current of PV input 80 A (40 A / 40 A)

Output Side Data

Nominal AC output power 30000 W

Max. AC output apparent power 33120 VA

Max. AC output current 48 A

Nominal AC voltage 3/N/PE, 230/400 Vac

AC voltage range 310...480 Vac

(May vary as per corresponding country’s grid
standard.)

Nominal grid frequency 50 Hz

Grid frequency range 47...53H z

(May vary as per corresponding country’s grid
standard.)

THD < 3% (at nominal power)

DC current injection <0.5%In

Power factor >0.99 default value at nominal power

(adj. 0.9 lagging...0.9 leadging)

Protection

Anti-islanding protection Yes

LVRT Yes

DC reverse connection protection Yes

AC short circuit protection Yes

Leakage current protection Yes

DC switch Integrated

DC fuse Integrated

64

Parameters ST 30

Overvoltage protection Type II DIN rail surge arrester

System data

Max. efficiency 98.3%

Max. European efficiency 98.0%

Isolation method Transformerless

Ingress protection rating IP65 ( Fans: IP55)

Night power consumption <1 W

Operating ambient temperature range -25°C...60°C( >45°C derating)

Allowable relative humidity range 0...95%, no condensing

Cooling method Smart forced air cooling

Max. operating altitude 4000 m (>2000 m derating may be possible)

Display Graphic LCD

Communication RS485 (RJ45 connector and screw terminal)

Certification VDE0126-1-1, EN62109-1, EN62109-2, VDE-AR-N-4105,

BDEW

Mechanical Data

Dimensions (W×H×D) 634×820×257 mm

Mounting method Wall bracket

Weight 65 kg

11.2 Terminals and Cables

Terminal Type Conductor size Recommended conductor size

AC terminals

PGA29L-27

Weidmuller terminal block
LX15/05/90

8 AWG…5 AWG

8… 16 mm²

7 AWG

10 mm²

DC terminals

MC4

PV-KST4/6II-UR

PV-KBT4/6II-UR

12 AWG…10 AWG

4...6 mm²

11 AWG

4 mm²

RS485Comm.
terminals

MG25A-H2-06-ST

Twist-pair type cable

Twist-pair type shielding Ethernet cable

Second PE
terminal

-

10 AWG…8 AWG

6 mm²

9 AWG

6 mm²

65

11.3 Exclusion of Liability

Although information contained in this manual has been checked with the greatest care for its accuracy and
completeness, not liability whatsoever can be accepted for errors or omissions. Sunways AG reserves the right
to change the hardware and software features described here at any time without prior notice.

Guarantee or liability claims for damages of any kind are excluded if they are caused by one or more of the
followings:

 Inappropriate use or installation of the product

 Installing or operating the product in an unintended environment

 Ignoring relevant safety regulations in the deployment location when installing or operating the

product

 Ignoring safety warnings and instructions contained in all documents relevant to the product

 Installing or operating the product under incorrect safety or protection conditions

 Altering the product or supplied software without authority

 The product malfunctions due to operating attached or neighbouring devices beyond allowed limit

values

 Damages caused by natural environment

This manual may not be reproduced, passed on, copied or translated into other languages in whole or in part
in any form or with any means without prior written approval by Sunways AG.

Sunways AG shall assume no guarantee for damage caused by faulty or lost data, due to incorrect operation
or the malfunction of the Solar Inverter, the software, additional devices or PCs.

All rights reserved © Sunways AG

The products named on cover page are protected by copyright and sold under licence. No part of this
document may be reproduced in any form without prior written approval of Sunways AG and the Sunways
licensors.

Registered trademark

The Sunways logo is a registered trademark of Sunways AG, Konstanz.

66

SD131912A 11/13 EN

Sunways AG

Photovoltaic Technology

Max-Stromeyer-Strasse 160

D - 78467 Konstanz

Telefon [phone]

Fax [phone]

E-Mail [e-mail]

www.sunways.de

Technische Hotline [phone]