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Sunways ST 30 User Manual

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User Manual
Sunways Inverter
ST 30
english
EN

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Summary of Contents for Sunways ST 30

  • Page 1 User Manual Sunways Inverter ST 30 english...
  • Page 3 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.

  • Page 5: Introduction

    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.
  • Page 6 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.
  • Page 7 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!

  • Page 8: Table Of Contents

    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..........................
  • Page 9 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...

  • Page 11: Safety Instructions

    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: ...
  • Page 12 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.
  • Page 13  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.

  • Page 14: Product Introduction

    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.

  • Page 15: Product Description

    2.2 Product Description 2.2.1 Product Appearance Fig. 2-2 Product Components Description Item Name Description Inverter operation data viewing and parameters configuration LCD display panel can be performed via the LCD display panel. Connection They are DC input terminals, AC output terminal and RS485 terminals communication terminal.
  • Page 16 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 ...

  • Page 17: Technical Description

    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.
  • Page 18 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: ...
  • Page 19  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.

  • Page 20: Installation Flow

    3 Installation Flow Fig. 3-1 Shows the installation flow of inverter for installer. Please follow these procedures. Start Unpacking and Inspection Read User Manual Storage Install Immediately Mounting Location Selection Moving Inverter Mounting the Inverter Electrical Connection Check before Commissioning Commissioning Troubleshooting Success?

  • Page 21: Unpacking And Storage

    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)

  • Page 22: Delivery Contents

    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 Fig.
  • Page 23 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.

  • Page 24: Installing Inverter Onto Wall

    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.
  • Page 25  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. ...

  • Page 26: Moving Inverter To Installation Site

     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.
  • Page 27 Fig. 5-3 Dimensions of Fastener Set for Metal Frame (mm) 5.3.1 Installing on Concrete Wall Remove backplate and fasteners from the packaging. Step 1 Place the backplate onto the chosen concrete wall and adjust it until it is in a horizontal position. Step 2 Mark the positions to drill holes using the backplate as template.
  • Page 28 5.3.2 Installing on Metal Frame Remove backplate and fasteners from the packaging. Step 1 Choose the best installation site according to above requirements. Place the backplate onto the Step 2 chosen metal frame and adjust it until it is in a horizontal position. Mark the positions to drill holes by using the backplate as template.

  • Page 29: Electrical Connection

    All electrical connection should follow the wiring rules and standards. 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. Description Description...

  • Page 30: Connecting Inverter To Ac Grid

    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”.
  • Page 31 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.
  • Page 32  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.

  • Page 33: Connecting Inverter To Pv Arrays

    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.
  • Page 34 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.
  • Page 35 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.
  • Page 36 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. Assemble cable ends with crimp contacts by crimping pliers. Step 2 Lead cable through cable gland.

  • Page 37: Grounding The Inverter

    Plug the positive and negative DC connectors into PV Step 9 terminals underneath the connection cabinet until it locks clicking into place Connect other PV strings following the above-mentioned Step 10 procedures. Seal the unused DC terminals with MC4 compatible Step 11 terminal caps.
  • Page 38 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.

  • Page 39: Communication Connection

    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.
  • Page 40 Communication Connection (RS 485 A/B bus or RJ 45) Inverter Terminating Resistor RS 485 A/B bus RJ 45 Only out. Only out. Single one 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.
  • Page 41 Only in Only in Inverter n (without Data Logging Device) 6.6.3 RS485 Communication Connection RS485A/B Bus Connection Lead shielding RS485 twist-pair type cable through communication cable gland to the Step 1 configuration circuit board. Trip off the insulating layer of the communication cables. Connect the cables to the RS 485 bus Step 2 terminal blocks.
  • Page 42 RJ45 Connection Lead shielding Ethernet cable through communication cable gland to the configuration circuit Step 1 board. Use the Ethernet crimper to crimp the cables and connect cables to RJ45 plug according to TIA/EIA Step 2 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.

  • Page 43: Commissioning

    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. Language selection screen will appear. Perform language settings Step 3 with the right two buttons.
  • Page 44 Press ▼ to choose country code. Confirm the settings by Pressing Step 6 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”.

  • Page 45: Disconnecting, Dismantling And Disposing The Inverter

    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.

  • Page 46: Troubleshooting And Maintenance

    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. 1. A fault is not removed yet. “Fault” indicator 2. Perform troubleshooting in according to fault type in LCD screen. See “9.1.2 is lit Troubleshooting of Faults in LCD Screen”.
  • Page 47 Fault Code Description Troubleshooting 1. The inverter will resume if the output current falls below the The AC output current protective value. 0006 exceeds inverter protective limit. 2. If the fault remains, please contact the Technical Hotline Inverter has checked 0007 AC overcurrent The inverter will self-recover after a few seconds.
  • Page 48 Fault Code Description Troubleshooting Inverter has checked that there is 0021 Check the layout and the wiring of PV1 input. overcurrent of PV1 input. Inverter has checked that there is 0022 Check the layout and the wiring of PV2 input. overcurrent of PV2 input.
  • Page 49 Fault Code Description Troubleshooting There is a fault with 1. Wait a moment for inverter recovery. 0044 DC/AC inversion 2. If the fault occurs repeatedly, contact the Technical Hotline circuit There is a fault with 0045 PV1 boost circuit. 1. Wait a moment for inverter recovery. 2.

  • Page 50: Maintenance

    Clean or replace the fans. Check the fuses and the DC SPD. Devices check Replace the fuse. Every 6 months Contact Sunways to order new DC SPDs. Check the LCD stop and emergency stop circuit of the system. Safety Once or twice a year function Simulate shutdown and check stop signal communication.
  • Page 51 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.
  • Page 52 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. Remove the blown string fuse.

  • Page 53: Contact Sunways Service

    9.3 Contact Sunways Service Should you have any problems in operating on the inverter, please contact us: Sunways Technical Hotline: Telephone +49 (0)7531 996 77-577 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: ...

  • Page 54: Operation Of Lcd Display

    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.

  • Page 55: Inverter Menu Structure

    10.2 Inverter Menu Structure Fig. 10-1 Menu Tree-English...

  • Page 56: Main Screen

    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 Description Power curve. x-axis: time in hours; y-axis: output power yield P in %. Icons (refer to the Table 10-3) and the Inverter active power limits (P-W limits).

  • Page 57: Adjust Contrast

    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 ▼...

  • Page 58: History Records

    “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 ▼) →...

  • Page 59: Start And Stop Inverter

    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.

  • Page 60: System Parameters Setting

    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)→...

  • Page 61: Running Parameters Setting

    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 ▼...
  • Page 62 Q-Var Inverter reactive power limits 0.0% 0...+100% / 0…-100% limits Over-frequency power derating slope (Pm/Hz) Derating 83.33% 40%...100% Slope* Only available when the country selected is “IT”. 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.
  • Page 63 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.

  • Page 64: Protective Parameters Setting

    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.
  • Page 65 The description of country code is illustrated below: Country Code Full Name Country Code Full Name Great Britain Germany France Italy Spain Austria Australia Czech Belgium Denmark GR_L Greece Land GR_IS Greece Island Netherlands Portugal China Sweden Other Country not included above Confirm by pressing OK after country code selection.
  • Page 66 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.

  • Page 67: Communication Parameters Setting

    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.
  • Page 68 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 ▼...
  • Page 69 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.
  • Page 70 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.
  • Page 71 “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.
  • Page 72 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...

  • Page 73: Appendix

    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...

  • Page 74: Terminals And Cables

    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...

  • Page 75: Exclusion Of Liability

    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.
  • Page 76 Sunways AG Photovoltaic Technology Max-Stromeyer-Strasse 160 D - 78467 Konstanz Telefon +49 (0)7531 996 77-0 Fax +49 (0)7531 996 77-444 E-Mail info@sunways.de www.sunways.de Technische Hotline +49 (0)7531 996 77-577...

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