Sungrow SG3425UD-MV System Manual
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Sungrow SG3425UD-MV System Manual

Mv turnkey station
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System Manual
MV Turnkey Station
SG3425UD-MV/SG3600UD-MV
MV
SG3425UD-MV/SG3600UD-MV
Turnkey StationSystem
ManualSG3425UD_3600UD-MV-
SEN-Ver19-202208M-H-002011
SG3425UD_3600UD-MV-SEN-Ver19-202208

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Summary of Contents for Sungrow SG3425UD-MV

  • Page 1 System Manual MV Turnkey Station SG3425UD-MV/SG3600UD-MV SG3425UD-MV/SG3600UD-MV Turnkey StationSystem ManualSG3425UD_3600UD-MV- SEN-Ver19-202208M-H-002011 SG3425UD_3600UD-MV-SEN-Ver19-202208...

  • Page 3: Table Of Contents

    Contents 1 About This Manual ...................1 1.1 Validity ......................1 1.2 Content......................1 1.3 Target Group ....................1 1.4 Symbols Explanation ..................2 1.5 How to Use this Manual ..................3 1.6 Terminology ....................3 2 Safety Instructions ....................4 2.1 Intended Usage....................4 2.2 Important Safety Instructions ................4 2.2.1 General Safety Rules ................5 2.2.2 Manual Storage ..................5 2.2.3 PV Arrays Hazards ................6...
  • Page 4 3.3 Internal Design of the MV Station..............13 3.3.1 Internal Components ................13 3.3.2 Cable Entry Design ................13 3.3.3 Internal Devices of the Inverter.............14 3.3.4 Operations on the DC and AC Side ............15 4 Delivery ......................17 4.1 Scope of Delivery ..................17 4.2 Identifying the MV Station................17 4.3 Checking for Transport Damages..............18 4.4 Storage of the MV Station ................18 5 Mechanical Installation...
  • Page 5 6.3.2 Cable Specifications................33 6.4 Ground Connection ..................33 6.5 AC Connection .....................35 6.5.1 Safety Instructions ................35 6.5.2 AC Cable Connection ................35 6.6 DC Connection.....................38 6.6.1 Checking before Connection ..............38 6.6.2 DC Cable Connection................38 6.7 Communication Connection ................42 6.8 External Equipment Connection..............42 6.8.1 5KVA Power Distribution Cabinet ............43 6.8.2 35KVA Power Distribution Cabinet............44 6.9 Finishing Electrical Connection ..............45...
  • Page 6 9.2.3 Backlight and Screensaver ..............56 9.3 Overview of LCD Menu and Icon..............56 9.3.1 Overview of Submenu and Icon............56 9.3.2 Layout of the submenus...............57 9.4 Entering Password ..................57 9.5 Setting Language ..................59 9.5.1 Conventional Way ................59 9.5.2 Shortcut .....................59 9.6 Setting Date and Time ..................59 9.7 Energy Output Deviation Adjustment..............60 9.8 Checking Running Information ..............60 9.9 Checking History Information ................61...
  • Page 7 10.7.2 High-voltage Mode ................72 10.8 MPPT ......................73 10.9 Intelligent Temperature-Control Technology ..........74 10.10 Anti-PID Effect Function (Optional).............74 10.10.1 Introduction to PID Effect ..............74 10.10.2 Anti-PID Function Setting ..............74 10.10.3 PID Repair ..................75 10.11 Insulation Monitoring Function..............75 10.11.1 Introduction ..................75 10.11.2 Simple Troubleshooting..............76 10.12 Emergency Stop Button functions ..............76 10.13 Tripping Functions of the DC Main Switches ..........76 10.14 Protection Function ...................77...
  • Page 8 12.4.2 Cleaning Interval ................99 12.4.3 Cleaning the Internal Dust..............99 12.4.4 Cleaning the Foundation ..............99 12.4.5 Checking and Cleaning the Air Inlets/outlets........99 12.4.6 Cleaning the Surface of the MV Station ..........100 12.4.7 Checking the Lock and Hinge............101 12.4.8 Checking the Sealing Strip ............... 101 12.5 Painting Make-up Measures ..............

  • Page 9: About This Manual

    About This Manual Validity This manual is intended for the following product: • SG3425UD-MV • SG3600UD-MV Hereinafter it will be referred to as " MV Station" unless otherwise specified. Content This manual contains the following information: Description Content Safety instructions concerning the installation, operation, maintenance...

  • Page 10: Symbols Explanation

    1 About This Manual System Manual • Equipped with certain electrical, electrical wiring and mechanical knowledge and familiar with electrical and mechanical principle diagram. • Familiar with the construction and working principle of the PV grid-connected power generation system. • Familiar with the construction and working principle of the MV Station upstream and downstream equipment.

  • Page 11: How To Use This Manual

    All rights reserved including the pictures, markings and symbols used. Any reproduction or disclosure, even partially, of the contents of this manual is strictly forbidden without prior written authorization of Sungrow. The contents of the manual will be periodically updated or revised due to the product development.

  • Page 12: Safety Instructions

    Safety Instructions Intended Usage The MV Station, designed and manufactured by Sungrow, is mainly applied to large-and- medium PV power stations. The MV Station can meet the requirements of modular design and quick installation for large-and-medium PV power stations, and can ensure long-term, reliable, and safe feed-in operation.

  • Page 13: General Safety Rules

    System Manual 2 Safety Instructions 2.2.1 General Safety Rules Touching of the terminals or contactors connected to the grid may lead to electric shock hazards! • Do not touch the terminals or conductors connected to the grid. • Respect all safety instructions on the grid connection. Lethal voltages are present inside the device! •...

  • Page 14: Pv Arrays Hazards

    2 Safety Instructions System Manual 2.2.3 PV Arrays Hazards DC high voltage! Electric shock hazards! When exposed to sunlight, PV array will produce voltage, which is very high in large-scale power stations. Death from burning and electric shock due to touching the PV array During installation, maintenance and troubleshooting of the device, ensure: •...

  • Page 15: Volt-Free Operations

    System Manual 2 Safety Instructions 2.2.7 Volt-free Operations Perform operations on the MV Station only when all devices inside the MV Station, especially the MV Ststion is completely voltage-free. • Avoid any accidental re-connections. • Verify that no voltage or current is present with appropriate measurement instrument •...

  • Page 16: Safety Warning Signs

    2 Safety Instructions System Manual Do not damage or tear the symbols. • All symbols on the device body must be clearly visible. • Replace the symbols once any damaged or unclearness is detected. 2.2.12 Safety Warning Signs During transport, installation, maintenance and troubleshooting of the MV Station, keep non- related persons away.

  • Page 17: Manual Description

    All the descriptions in this manual are based on the standard MV Station, and the actual product you receive may differ. If necessary, specify your requirements when placing the order. This manual may not cover all possible situations. Should a specific problem occur that is not explained in this manual, contact Sungrow.

  • Page 18: Product Description

    Product Description Brief Introduction The MV Station mainly applies to medium and large-scale PV generation systems. Based on standard-sized outdoor container, the MV Station integrates inverter, transformer,power distribution and monitoring unit to meet with the requirements of modular design and fast installation of the PV systems.The MV Station converts DC current generated from the PV array into grid-compatible AC current, which can be directly fed into the medium voltage grid.

  • Page 19: Mechanical Parameter

    System Manual 3 Product Description figure 3-1 Control and Monitoring window The LEDs at the upper side of the Control and Monitoring Window: POWER indicates power-on state; OPERATION indicates normal operation; and FAULT indicates the occurrence of faults. The working status of the MV Station can be acquired through these LEDs. Description Color The control circuit power supply is supplying power.

  • Page 20: Ventilation Design

    3 Product Description System Manual Clearance Spaces The clearances around the inverter should be sufficient for the doors to be opened. 3.2.3 Ventilation Design The ventilation system is designed as the cool air comes inside from the top of the inverter and hot air gets outside from the bottom of the inverter.

  • Page 21: Internal Design Of The Mv Station

    System Manual 3 Product Description Internal Design of the MV Station 3.3.1 Internal Components Figure below shows the bottom view of the major electrical components inside the MV Station: Description Device Convert the DC current generated from the PV array into AC Inverter current.

  • Page 22: Internal Devices Of The Inverter

    3 Product Description System Manual Description Name DC cables connect to the inverter through DC cable inlet these holes. AC cables connect to the MV transformer AC cable outlet through this hole. Communication, power Communication and power distribution distribution, and grounding cables of the intelligent PMD come inside cable entry the MV Station through this hole.

  • Page 23: Operations On The Dc And Ac Side

    System Manual 3 Product Description AC Cabinet figure 3-3 AC cabinet Description Remark Name Connecting/disconnecting the AC side of AC circuit breaker the inverter 3.3.4 Operations on the DC and AC Side DC load break switches and AC circuit breakers are provided on inverter. Description Name When the circuit breaker has no energy,...
  • Page 24 3 Product Description System Manual The DC load break switches/AC circuit breakers can be used together with a micro-motor. When there is the power supply on the AC side of the inverter, the energy can be stored to the breaker through this motor. When there is no power supply on the AC side of the inverter, manually store the energy through the manual energy storage handle.

  • Page 25: Delivery

    Specifically, refer to the enclosed packing list. Identifying the MV Station Identify the MV Station via its nameplate. The nameplate contains the following information: MV Station model, major technical parameters, marks of conformity, origins, and serial number which are available and recognized by Sungrow.

  • Page 26: Checking For Transport Damages

    Therefore, once receiving the MV Station, perform a detailed inspection If any damage is found, contact the shipping company or Sungrow immediately. • Check the scope of delivery described in "4.1 Scope of...

  • Page 27: Mechanical Installation

    Mechanical Installation Respect all local standards and requirements during mechanical installation. Transport All devices are installed inside the MV Station before delivery. The MV Station should be transported as a whole. Transport the MV Station by crane with sufficient load capacity. The MV Station is delivered to the user by a forwarding company.

  • Page 28: Hoisting The Mv Station

    5 Mechanical Installation System Manual • Place the MV Station carefully and gently. Do not pull or push the MV Station on any surface. • The place should be firm and flat, has good drainage and has no obstacles or outshoots. The MV Station should be placed and supported by the four feet.

  • Page 29: Hoisting

    System Manual 5 Mechanical Installation 5.2.2 Hoisting In the whole hoisting process, observe following rules: • Hoist the MV Station in a vertical manner. Do not drag or drop the MV Station on any surface. • When the MV Station has been hoisted for about 300mm from the ground, stop to check if all the connections are still firm.

  • Page 30: Fastening Of Connectors

    Lateral pin of the U-hook Insert the hook from inside Notice should be tightened. to outside. • National and local safety rules should be observed at all times. • Regardless of relevant safety rules may void pertinent warranty claims from Sungrow.

  • Page 31: Foundation

    System Manual 5 Mechanical Installation Foundation 5.3.1 Selection of Installation Site When selecting the installation site, consider at least the following requirements: • Ambient and geological conditions, such as stress wave emissions, the level of underground water table, etc. should be taken into account. •...

  • Page 32: Recommended Foundation Construction Method

    5 Mechanical Installation System Manual 5.3.3 Recommended Foundation Construction Method The overall diagram is shown in the following figure. Name Pea gravel ground Foundation Constructing the Foundation It is recommended to construct the foundation as the following solution. Name MV Station base Fixing the MV Station Hoisting the MV Station to the desired location and welded.

  • Page 33: Installing The Drain Valve(Optional)

    System Manual 5 Mechanical Installation 5.4.1 Installing the Drain Valve(Optional) Overview The installation positions of the drain valve are reserved at the bottom of the MV Station, which are located on the front and back of the MV Station, as shown in figure A below. Installation Parts Before installing the drain valve, the required parts: •...

  • Page 34: Fixing The Mv Station

    5 Mechanical Installation System Manual If the installation of the oil-water separator is needed, please contact SUNGROW customer service or designated partners. Fixing the MV Station If the foundation is constructed as the above plan, the MV Station needs to be hoisted to the desired location and welded.
  • Page 35 System Manual 5 Mechanical Installation...

  • Page 36: Electrical Installation

    Electrical Installation Safety Instructions 6.1.1 Generals Rules High voltage! Electrical shock hazards! • Do not touch the live components of the device. • Make sure the AC and DC sides are voltage-free before installation. • Never put flammable materials in the vicinity of the MV Station. If a ground fault occurs in the PV system, some parts that are supposedly voltage- free may carry lethal voltage.
  • Page 37 • The installation and design of the MV Station must fulfill national and local standards and regulations. • Sungrow shall not be held liable for the MV Station or system fault caused by ignorance of the description in this manual.

  • Page 38: Five Safety Rules

    6 Electrical Installation System Manual Select optical fibers as the external communication cable to lower the signal interference. 6.1.2 Five Safety Rules During electrical connections and other operations on the inside device, observe the following Five Safety Rules: • Disconnect all the external connections and disconnect the MV Station internal power supply.

  • Page 39: Opening The Inverter Door

    System Manual 6 Electrical Installation 6.2.2 Opening the Inverter Door Opening the Enclosure The locks are installed on the inverter enclosure (Figure A below). Open the protective cover on the door lock. Insert the key. Turn the handle counterclockwise to unlock the door. Opening the Door Lock Open the doors before cable connection.

  • Page 40: Checking The Cables

    6 Electrical Installation System Manual 6.2.3 Checking the Cables Check to ensure the intactness and insulation of all cables before electrical connection. Poor insulation or damages in the cables may cause hazards. Replace them if necessary. 6.2.4 During Connection • Make sure the DC cables are correctly routed before connection.

  • Page 41: Cable Specifications

    System Manual 6 Electrical Installation table 6-1 Ports in the figure above Name DC input AC output External communication port External 3-pahse power supply 6.3.2 Cable Specifications Choose cables according to the rules below: • All the cables must have sufficient ampacity. The ampacity of the conductor can at least be influenced by environmental conditions, conductor insulation materials, laying, wire materials, cross-sectional areas, etc.
  • Page 42 6 Electrical Installation System Manual External Grounding For ease of onsite cable connection, two grounding points are designed at the exterior of the MV Station, as shown in the figure below. On site, reliably connect both or either of the two grounding points according to actual conditions.

  • Page 43: Ac Connection

    Any installations not following the standards or the installation and alternation without permission may lead to safety incidents or damage to the devices. Sungrow shall not be held liable for the damages caused. AC Connection 6.5.1 Safety Instructions...
  • Page 44 6 Electrical Installation System Manual Wiring Area Note: The figure is for reference only, and the actual product may differ. Wiring Steps step 1 Drill holes on the bottom sealing plate of the HV cabinet according to local standards and regulations.
  • Page 45 System Manual 6 Electrical Installation On site, determine the number of output cables and the wiring scheme according to actual situation. After wiring, reliably connect the cable connector to the grounding copper bar inside the high-voltage room according to local standards and regulations, where the fastening torque is 60~70N.m.

  • Page 46: Dc Connection

    6 Electrical Installation System Manual After completing wiring, fix the cable on the beam (not included in the scope of supply) to avoid excessive stress on the cable. Seal the bottom cable entries with fireproof mud (foaming materials), remove debris in the HV cabinet, close and lock the cabinet door.
  • Page 47 System Manual 6 Electrical Installation DC Connection Area figure 6-1 DC input(n≤24） figure 6-2 DC input(n＞24） figure 6-3 DC connection area with energy storage system ports Description DC positive cable connection area DC negative cable connection area Energy storage system port...
  • Page 48 6 Electrical Installation System Manual Cable Requirements • The maximum cross-sectional area of the aluminum/copper cable is 400mm /750Kcmil. • Fasten the wiring terminal with the bolts in the scope of delivery. And the torques are shown in following table. Bolt Torque M12×55...
  • Page 49 System Manual 6 Electrical Installation Name Name Copper bus Disc spring washer Cable lug Flat washer Bolt When the aluminum wire is selected, a copper-aluminum adapter terminal is needed as shown below: Name Name Disc spring Copper bus washer Copper-aluminum adapter Flat washer terminal Bolt...

  • Page 50: Communication Connection

    6 Electrical Installation System Manual • Incorrect connection sequence may cause fire. Pay maximum attention to the connection sequence. • Ensure the firmness of the cable connection. Poor connection or oxidation of the surface may cause over-heating or fire. • Long bolts may affect the insulation and may cause short circuit.

  • Page 51: 5Kva Power Distribution Cabinet

    System Manual 6 Electrical Installation Unless the MV transformer disconnect switch is open, 630V AC may be present in the Power Distribution Cabinet. 6.8.1 5KVA Power Distribution Cabinet Internal Components Name Control switch for self-constructed grid Control switch for auxiliary transformer Control switch for 120Vac power supply Reserved for 120Vac power supply Reserved for 120Vac power supply...

  • Page 52: 35Kva Power Distribution Cabinet

    6 Electrical Installation System Manual 6.8.2 35KVA Power Distribution Cabinet Internal Components Name Control switch for self-constructed grid Control switch for auxiliary transformer Control switch for 120Vac power switch Reserved for 120Vac power supply Reserved for 120Vac power supply Reserved for 120Vac power supply Reserved for 120Vac power supply Reserved for 120Vac power supply...

  • Page 53: Finishing Electrical Connection

    System Manual 6 Electrical Installation Name Reserved for 120Vac power supply QF10 Reserved for 120Vac power supply QF11 Reserved for 120Vac power supply QF12 Control switch for power socket QF13 Reserved for 480Vac power supply QF14 Reserved for 480Vac power supply QF15 Reserved for 480Vac power supply QF16...
  • Page 54 6 Electrical Installation System Manual • Close the cable entries on the bottom of the module by following the reversed procedure in opening the cable entries. • The gap at the cable inlet/outlet at the bottom of the MV Station should be sealed with fireproof mud.

  • Page 55: Commissioning

    Commissioning Safety Instructions High voltage! Electric shock! • Wear proper protection equipment before all operations on the device. • Do not touch the live terminals or conductors. • Respect all safety instructions attached on the device and described in this manual.

  • Page 56: Checking Before Commissioning

    7 Commissioning System Manual • Ensure all cables are connected securely and all bolts are fixed properly. • Ensure DC side voltage meets inverter requirements and the polarity is correct. • Ensure AC side voltage meets inverter requirements. • Ensure all cable connections meets related standards and requirements. •...

  • Page 57: Checking Grid Voltage

    System Manual 7 Commissioning DC side voltage should be no more than the max. DC input voltage of the MV Station. Too high DC voltage may damage the module even cause safety incident. To ensure system reliability and device operation, PV cells on the DC side of the MV Station should be from the same manufacturer and the number of PV cells in each string should be the same.

  • Page 58: Preparation Before Starting

    7 Commissioning System Manual Preparation before Starting • Place the disassembled protection grills to their original positions and ensure the connection is secure. • Close and lock the cabinet door. • Clean the device site. Make sure the position is clean without flammable or explosive materials.
  • Page 59 System Manual 7 Commissioning MV Station needs no manual control in daily operation. Open the cabinet door only for maintenance or troubleshooting and by qualified personnel only. Keep the door closed and locked and store the keys of the door by appointed personnel during normal operation.

  • Page 60: Starting/Stopping

    Starting/Stopping Starting 8.1.1 Inspection before Starting After the maintenance or service work, inspect the following items, and then start the MV Station, • All connections are performed by strictly following the installation manual and circuit diagram. • The coverings of the internal devices are fixed and secured. •...

  • Page 61: Stopping

    System Manual 8 Starting/Stopping Specific switch position，refer to "3.3.3 Internal Devices of the Inverter" "6.8 External Equipment Connection". After startup, the MV Station will automatically check if parameters of the DC and AC side meet the grid-connection requirements. If so and the set time have been reached, the MV Station will turn to the OPERATION mode and feed the generated AC current to the grid.

  • Page 62: Stop In Case Of Fault

    8 Starting/Stopping System Manual 8.2.2 Stop in Case of Fault Proceed as follows to stop the MV Station when a fault or emergency occurs as follows: step 1 Press the emergency stop button. step 2 Turn the DC knob switch to the OFF position. step 3 Disconnect the QS6 AC maintenance switch, and QS5 DC maintenance switch.

  • Page 63: Lcd Menu Operation

    LCD Menu Operation LCD Touch Screen The eye-level LCD touchscreen inside the monitoring window on the back side of the inverter is used to view data and set parameters. For user convenience, a large number of figures of the LCD interface are provided in this chapter.

  • Page 64: Backlight And Screensaver

    Do not modify any parameters without full understanding of the relevant action or without consulting Sungrow Customer Support. 9.2.3 Backlight and Screensaver If no operation has been performed on the screen for more than 5 minutes, the backlight will go off.

  • Page 65: Layout Of The Submenus

    System Manual 9 LCD Menu Operation Main Menu First sub-menu Second sub-menu Third sub-menu E-adjust Load default Run-parameter — Pro-parameter — Address Serial port param. Com-parameter Network param. 9.3.2 Layout of the submenus The layout of submenus is the same as that shown below except for the default menu. Description Title bar The first line from the top is the present success rate of communication.
  • Page 66 9 LCD Menu Operation System Manual step 3 Tap the white edit box and a keypad pops up. step 4 Enter the password 1111 through the keypad. If the entered password is correct, the parameter setting page pops up, and the user can set system parameters, running parameters, protection parameters, and communication parameters.

  • Page 67: Setting Language

    System Manual 9 LCD Menu Operation Setting Language User can set the language by either of the following two ways: 9.5.1 Conventional Way step 1 Tap “Function” from the default menu. step 2 Tap “Set-parameter”. step 3 Tap “Sys-parameter” after entering the correct password. step 4 Tap “Language &...

  • Page 68: Energy Output Deviation Adjustment

    9 LCD Menu Operation System Manual Energy Output Deviation Adjustment Energy output deviation adjustment is useful when the total power output displayed in LCD (E-total) is different from the reading value of the external power measuring device. (Energy-adj value)= (Real measured value)-(E-tot reading value). step 1 Tap “Function”...

  • Page 69: Checking History Information

    System Manual 9 LCD Menu Operation The value displayed is indicative only and cannot be used as a basis for billing. - - End Checking History Information There are four kinds of history information: History event, history fault, history data and history alarm.

  • Page 70: Checking History Alarm

    9 LCD Menu Operation System Manual History faults can be viewed from this sub-menu, with up to 5 records can be shown in one page. The upper left side of the event table is the total number of the current fault records. Tap “Prev”...

  • Page 71: Starting/Stopping

    System Manual 9 LCD Menu Operation 9.11 Starting/Stopping Usually, the MV Station will start automatically when the grid-connected requirements are met. Start/stop the MV Station through the LCD screen in either of the following manners: • Tap “Start/Stop” from the default menu. •...

  • Page 72: Parameters Of Lcd

    9 LCD Menu Operation System Manual 9.14 Parameters of LCD 9.14.1 Communication Parameters Improper communication parameter configuration may lead to communication failure! Follow strictly the instructions of the plant staff in configuring the communication parameters. Proceed as follows to set the communication parameters: step 1 Tap “Function”...

  • Page 73: Main Functions

    10 Main Functions 10.1 Operation Mode 10.1.1 Mode Change After being energized, the MV Station switch among different modes as shown in the figure below. figure 10-1 Operation modes change is the DC input voltage of the module. Start is the module DC side startup voltage. 10.1.2 Operation Mode Description Stop This is the initial state of the module.
  • Page 74 10 Main Functions System Manual Startup This is the transient process between the Initial Standby mode and the Run mode. Once the Startup mode is complete, module will start powering the grid. In this mode, module converts the DC energy into AC energy and feeds it to the grid by way of MPPT.

  • Page 75: Complete Control Strategy(Optional)

    Frequency rising affects the system stability • Grid maintenance • Grid management 10.3.2 How to Realize Power Limitation Improper parameter configuration may affect the normal operation of the MV Station! Only authorized personnel can configure these parameters. Should any questions or doubt occur, contact Sungrow.

  • Page 76: Reactive Power Adjustment

    10 Main Functions System Manual User can adjust the MV Station active power output through the LCD display: step 1 Tap “Function” from the default menu. step 2 Tap “Set-parameter”. step 3 Tap “Run-parameter” after entering the correct password. step 4 Set the “Limit Power (%)” parameter by tapping the pop-up keypad. step 5 Tap “Enter”...

  • Page 77: Low Voltage Ride Through (Lvrt)

    Improper parameter configuration may affect the normal operation of the MV Station! Only authorized personnel can configure these parameters. Should any question or doubt occurs, contact Sungrow. 10.5 Low Voltage Ride Through (LVRT) Technical Requirements for Connecting Photovoltaic Power Station to Power System requires medium-and-large PV plant should be equipped with Low Voltage Ride Through (- LVRT) ability.

  • Page 78: High Voltage Ride Through (Hvrt)

    10-3 High voltage withstand requirements Note: T1, T2, U1, and U2 are all settable parameters. Sungrow’s MV Staion meets the abovementioned requirements. 10.7 Self-constructed Grid In the early stage of power station commissioning, when the inverter has no AC power or the grid cannot transmit power for some reason, the on-site equipment can not be commissioned because there is no power supply.
  • Page 79 System Manual 10 Main Functions Prerequisites Before operation, make sure that all isolating switches and miniature circuit breakers in the intelligent power distribution cabinet are in the off state. Operation Method step 1 Disconnect the load-break switch of the MV transformer and close the output switches of upstream PV combiber boxes of inverter.

  • Page 80: High-Voltage Mode

    10 Main Functions System Manual At this time, the intelligent power distribution cabinet can supply power for debugging tools, test equipment, etc. - - End Subsequent Processing After debugging, disconnect all the micro-circuit breakers of the power distribution cabinet. Stop the #1 unit through the LCD screen of inverter. On the LCD screen of inverter, click "Function"...

  • Page 81: Mppt

    System Manual 10 Main Functions step 4 Close the HV switch (QS9) inside the intelligent power distribution cabinet, and disconnect the LV switch (QS8). step 5 Via the LCD screen of inverter, click "Function" -> "Set-parameter" –> "Run-parameter" -> "- High voltage mode".

  • Page 82: Intelligent Temperature-Control Technology

    This MV Station is equipped with optional anti-PID function to effectively prevent the PID. 10.10.2 Anti-PID Function Setting For MV Station with optional anti-PID function, the enable and disable of this function can only be performed by personnel from Sungrow. Contact Sungrow if you need to switch this function.

  • Page 83: Pid Repair

    Sungrow’s MV Station is equipped with insulation resistance monitoring function to detect the system insulation resistance in real time.

  • Page 84: Simple Troubleshooting

    10 Main Functions System Manual • Automatic mode: Upon first power-on, the equipment will be in negative pole grounding mode. After transfer from operating mode to standby mode, in the morning of the second day, when DC voltage exceeds insulation monitoring starting voltage, the equipment will exit negative pole grounding mode and enter insulation monitoring mode.

  • Page 85: Protection Function

    System Manual 10 Main Functions step 3 Tap “Run-parameter” after entering the correct password. step 4 Click Next to find the page with “Trip” and select “Enable” . Before the MV Station is put into operation again, set the parameter “Trip” as “Disable” first, then close all the DC main switches of the MV Station.

  • Page 86: Overload Protection

    10 Main Functions System Manual 10.14.5 Overload Protection When the PV array output power exceeds the MV Station permissible maximum input power, MV Station will limit the power yield at maximum AC power point. If the temperature exceeds the permissible value, MV Station will automatically stop operating unless the condition resumes normal.

  • Page 87: Troubleshooting

    The model number can be acquired from the marking of the MV Station or the component itself. If otherwise, contact Sungrow. If the field work needs to replace the components with products from other manufacturer or with different model number, a prior analysis and confirmation by Sungrow is needed.

  • Page 88: Fault And Troubleshooting On The Inverter

    11 Troubleshooting System Manual If there is any questions or doubts that are not covered by this manual, contact us. With the following information provided, Sungrow shall diagnose and solve the problem more easily: • Type and serial number of the MV Station and internal devices •...
  • Page 89 System Manual 11 Troubleshooting Fault Fault Explanation Measures severity name 1. Check, with a thermodetector, whether the present ambient temperature is within the permissible range of the module. The reactor 2. Check that the air inlets of the MV L over- temperature is Major Station are not obstructed.
  • Page 90 11 Troubleshooting System Manual Fault Fault Explanation Measures severity name 1. Ensure the ambient temperature. Check, with a thermodetector, whether The fault occurs the present ambient temperature is within when the the permissible range of the module. temperature at 2. Check that the air inlets of the MV Temp-flt Major the air inlet is...
  • Page 91 System Manual 11 Troubleshooting Fault Fault Explanation Measures severity name Grid blackout 1. Check whether the grid is normal. occurs or AC 2. Check whether power outage occurs lsland/No transient voltage Major on the AC side. grid exceeds the 3. Check whether the AC circuit breakers protective of the module are connected.
  • Page 92 11 Troubleshooting System Manual Fault Fault Explanation Measures severity name The state window of the SPD is as follows: 1. When the window colour is turned red from green, it indicates that the SPD is damaged (perhaps, due to The SPD on the thunderstorms).
  • Page 93 System Manual 11 Troubleshooting Fault Fault Explanation Measures severity name Polarity on the PV pol- Check whether the polarity on the DC of Major DC input side is the module is correct. reserved. Interior hardware Measure the DC voltage of the MV Hardwar- of the module is Major...
  • Page 94 11 Troubleshooting System Manual Fault Fault Explanation Measures severity name 1. Check the DC cables. Check whether positive DC cables connected to the ground are damaged. Check whether the impedance to ground of the DC cable is normal. Grounding fault. Major Gnd-flt 2.
  • Page 95 System Manual 11 Troubleshooting Fault Fault Explanation Measures severity name Current2 Unbalan- Measure the grid voltage, to check ced/ AC current Major whether phase loss occurs. Current3 unbalance Unbalan- AC switch is Connect the AC switch, after which the Major switch disconnected.
  • Page 96 Check whether the DC fuse have blown. DC fuses of the DC fuse- inverter are Minor If so, contact Sungrow and replace the abnormal abnormal. fuses. Branch fuses of Branch Refer to the measures for "DC fuse-...
  • Page 97 Y type, ensure that the protective neutral point is unconnected. threshold. If the fault still exists, contact Sungrow Service. If the following fault occurs, immediately contact Sungrow Service. (referred to as "Sungrow" hereinafter). Fault Explanation Fault name...

  • Page 98: Fault And Troubleshooting On The Mv Transformer

    11 Troubleshooting System Manual Fault Explanation Fault name Measures severity Internal Major Contact Sungrow. Com-Failure communication of the inverter is abnormal Addresses of the Encoding interior modules are Major Contact Sungrow. repeat repeated. Backfeed Reverse charging Major Contact Sungrow. Supply fault device is out of service.
  • Page 99 Explanation Fault severity Fault name Measures The temperature in the oil tank of the Trans-oil-T trip transformer is Major Contact Sungrow. abnormal, and tripping occurs. The pressure relief Pressure release valve of the Major Contact Sungrow. valve trip transformer is faulty.

  • Page 100: Other Fault And Troubleshooting

    Refer to the converters are matched. "Measures". Communicate again after replacing the converter. The monitor software is installed incorrectly. It is recommended to reinstall the software. If all the above-mentioned items are correct and this fault continues, contact Sungrow.

  • Page 101: Routine Maintenance

    12 Routine Maintenance 12.1 Overview For maintenance items beyond this manual, please confirm with SUNGROW or contact SUNGROW for maintenance, and unauthorized operation is strictly prohibited. 12.2 Safety Instructions Due to the effect of ambient temperature, humidity, dust and vibration, the MV Station and the internal components will age and wear.

  • Page 102: Five Safety Rules

    12 Routine Maintenance System Manual Disconnection of the AC & DC switches in no way implies that there is no voltage of the cable connection terminals inside the AC and DC cabinet. To avoid the risk of electric shock before maintenance work, •...
  • Page 103 Make sure all bolts are securely fixed. Repair immediately any anomalies found during routine maintenance. If any doubts arise, contact Sungrow. Maintenance (once every three years) Check item Check method •...
  • Page 104 12 Routine Maintenance System Manual Maintenance (once every two years) Check item Check method Check the following items and make corrections if necessary: • Check whether the MV Station and its internal devices are damaged or deformed. • Check whether the device makes abnormal noise or System status and sound during operation.
  • Page 105 System Manual 12 Routine Maintenance Maintenance (once every year) Check item Check method Check the following items and make corrections if necessary: • Check whether there inflammable combustible materials and other threats around or on the top of the MV Station that may affect the normal operation.
  • Page 106 12 Routine Maintenance System Manual Check item Check method • Check whether the grounding connection is performed properly and the grounding resistance is less than 4Ω. Grounding and • Check whether the equipotential connections inside the equipotential connections MV Station are performed properly. •...

  • Page 107: Cleaning The Mv Station

    System Manual 12 Routine Maintenance Note: * indicates optional. The frequency of maintenance operations could be increased according to the environmental conditions of the place where the MV Station is suited, plant capacity and on-site situations. The maintenance interval should be shortened if the sand or dust deposition around the operation site is serious.

  • Page 108: Cleaning The Surface Of The Mv Station

    12 Routine Maintenance System Manual Procedure Clean the air inlets with a vacuum. 12.4.5.2 Air Outlets Brief Introduction The lower air outlet is located at the lower part of the inverter. It is recommended to clean the filter screen of the air outlet regularly. Procedure Unscrew the bolts at the bottom of the inverter, to remove the bottom plate.

  • Page 109: Checking The Lock And Hinge

    System Manual 12 Routine Maintenance 12.4.7 Checking the Lock and Hinge Check the functionality and state of the lock and hinge of the MV Station after the cleaning work. Lubricate the lock and hinge if necessary. 12.4.8 Checking the Sealing Strip The sealing strip is used to prevent the water penetrating insider the MV Station.
  • Page 110 12 Routine Maintenance System Manual Figure Step 1. Polish the rough paint surface or the scratched parts by abrasive paper until the surface is smooth. 2. Clean the target parts by cleaning cloth with water or use 97% alcohol. 3. When the surface is clean and dry, paint the scratched parts of the paint by banister brush and make sure the painting is as uniform as possible Maintenance and Operation Steps for Situation 3:...
  • Page 111 System Manual 12 Routine Maintenance Figure Step 1. Polish the damaged parts of the paint to remove the surface rust or other roughness. 2. Clean the target parts by cleaning cloth with water or use 97% alcohol to clean the surface dust and dirty. 3.

  • Page 112: Replacement Of The Electrical Components

    Strictly observe the instructions in this chapter to replace the fuse. Any personal injury or property damage caused by the disobedience of this chapter may void pertinent warranty claims from Sungrow. Only qualified technical persons who have fully understood the description in this chapter can perform the operations in this chapter.
  • Page 113 12 Routine Maintenance Without our confirmation, do not replace the fuse with the one from another manufacturers or of a different model. Otherwise, Sungrow shall not be responsible for any possible personal injury or property damage. 12.6.2.1 DC Fuse Area The DC cabinet inside the MV Station is equipped with DC fuses.
  • Page 114 12 Routine Maintenance System Manual Descriptions Figure 1. Unscrew fastening bolt of the to-be- replaced fuse with a socket spanner. 2. Remove the fuse. 3. Use M8×30 bolt to fasten new fuse with a socket spanner. Fastening torque:18~23N.m.

  • Page 115: Cyber Security Protocol

    After initial login, change the HMI password (1111) to a site-unique password with 4 numbers. It is recommended to change the password every 6 months. If the password needs to be reset, please contact Sungrow. 13.2 Port Protection and Isolation Ensure that the inverters are installed such that the network zone has ingress protection and minimized port exposure.
  • Page 116 13 Cyber Security Protocol System Manual Ensure that all RS-485 data cables are inspected periodically for damage, wear and tear.

  • Page 117: Cybersecurity Best Practice

    14 Cybersecurity Best Practice It’s important to locate the Inverter in a secure network zone (e.g., SCADA network or PCN), that is blocked from direct communication with the Internet and/ orCorporate IT networks by network security devices (e.g., firewalls). This networkisolation concept is a best practice recommendation based on the Purdue ReferenceModel (PRM), an industry leading Industrial Control System (ICS) cybersecuritymodel adopted by standards and frameworks such as the ISA 62443,...

  • Page 118: Appendix

    15 Appendix 15.1 System Parameter Input (DC) SG3425UD-MV SG3600UD-MV Max. PV input voltage 1500V Min. PV input voltage 875 V 915V Startup input voltage 915 V 955 V 250A, 315A, 400A, 450A, 500A Available DC fuse sizes MPP voltage range...

  • Page 119: Tightening Torques

    System Manual 15 Appendix Grid monitoring / Ground fault Yes / Yes monitoring Insulation monitoring Overheat protection General Data Dimensions (W x H x D) 6058 x 2896 x 2438 mm / 238.5'' x 114.0'' x 96.0'' Weight 18000 kg/ 39683.2 lbs NEMA 4X( Electronic for Inverter) / NEMA 3R Degree of protection (Others)

  • Page 120: Exclusion Of Liability

    • Unforeseen calamity or force majeure The use of supplied software produced by Sungrow Power Supply Co., Ltd. is subject to the following conditions: • Sungrow Power Supply Co., Ltd. assumes no liability for direct or indirect damages arising from the use of Software.
  • Page 121 Sungrow Power Supply Co., Ltd. www.sungrowpower.com...

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