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Sungrow SG3150UD-MV-US User Manual
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Sungrow SG3150UD-MV-US User Manual

Sungrow SG3150UD-MV-US User Manual

Mv grid-connected pv inverter
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User Manual
MV Grid-connected PV Inverter
SG3150UD-MV-US/SG4400UD-MV-US
SG3150UD-MV-US/
MV Grid-connected PV
SG4400UD-MV-US
InverterUser ManualSG3150_
4400UD-MV-US-UEN-Ver21-
202411M0D00289
SG3150_4400UD-MV-US-UEN-Ver21-202411

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Summary of Contents for Sungrow SG3150UD-MV-US

  • Page 1 User Manual MV Grid-connected PV Inverter SG3150UD-MV-US/SG4400UD-MV-US SG3150UD-MV-US/ MV Grid-connected PV SG4400UD-MV-US InverterUser ManualSG3150_ 4400UD-MV-US-UEN-Ver21- 202411M0D00289 SG3150_4400UD-MV-US-UEN-Ver21-202411...
  • Page 3 Software Licenses • It is prohibited to use data contained in firmware or software developed by SUNGROW, in part or in full, for commercial purposes by any means. • It is prohibited to perform reverse engineering, cracking, or any other operations that...
  • Page 5 Contents All Rights Reserved .....................I 1 About This Manual ...................1 1.1 Validity......................1 1.2 Target Group ....................1 1.3 How to Use This Manual .................1 1.4 Symbol Explanations ..................2 2 Safety Instructions ....................3 2.1 Unpacking and Inspection ................4 2.2 Hoisting and Transportation................5 2.3 Electrical Connection ..................5 2.4 Operation.......................7 2.5 Operation and Maintenance ................7...
  • Page 6 5.2 Inspection Before Installation.................22 5.2.1 Scope of Delivery ................22 5.2.2 Product Inspection ................23 5.3 Installation Environment Requirements ............23 5.3.1 Installation Site ...................23 5.3.2 Foundation ..................24 5.3.3 Installation Spacing ................24 5.4 Hoisting and Fixing ..................26 5.4.1 Safety Precautions ................26 5.4.2 Hoisting Schematic ................27 5.4.3 Hoisting Procedure................29 5.4.4 Fixing ....................30 5.5 Installing Brackets ..................30...
  • Page 7 6.8.1 External Power Supply Connection............49 6.8.2 Wiring Diagram ...................50 6.8.3 Recommended Cables Installation ............51 6.9 Check After Wiring..................52 6.9.1 Inspection...................52 6.9.2 Locking Cabinet Door ................52 6.9.3 Fixing Cable ..................53 7 Powering Up and Powering Down ...............54 7.1 Safety Instructions ..................54 7.2 Powering Up Operations ................54 7.2.1 Removing Film on Product..............54 7.2.2 Adjusting Off-Load Tap Changer ............56...
  • Page 8 8.4 Modifying Password..................65 8.5 Logout ......................65 9 Main Function ....................67 9.1 Operation Mode ...................67 9.1.1 Mode Change ..................67 9.1.2 Operation Mode Description..............67 9.2 Emergency Stop Button Functions ..............69 9.3 IGBT Modules Over-temperature Protection ...........69 9.4 Overtemperature Protection of Reactors ............69 9.5 Tripping Functions of DC Load Switches and MV Load Switch ......69 9.6 MV Disconnection Equipment（Optional）.............70 9.7 Derating Protective ..................71...
  • Page 9 11.4.6.3 Broken Primer................98 11.4.7 Checking Door Locks and Hinges ............99 11.4.8 Checking Sealing Strips ..............99 11.5 Replacing Fuse...................99 11.5.1 Replacing DC Side Fuse ..............99 11.5.2 Replacing Off-grid Commissioning Fuse..........100 11.5.3 Replacing DC SPD Fuse..............100 11.5.4 Replacing Fuse Outside Power Distribution Cabinet......101 11.5.5 Replacing Fuse Inside Power Distribution Cabinet ......
  • Page 11 MV Grid-connected PV Inverter. Validity This manual applies to the following models: • SG3150UD-MV-US • SG4400UD-MV-US MV is short for “Medium Voltage”. PV is short for “Photovoltaic”. This manual briefly introduce the installation and operation methods of the product.
  • Page 12 If the manual received is slightly inconsistent with the product, it may be a result of a product version upgrade, and the actual product shall prevail. For any questions, please contact SUNGROW Customer Service. Symbol Explanations To ensure the safety of the users and their properties when they use the product and to make sure that the product is used optimally and efficiently, this manual provides users with the relevant safety information which is marked by the following symbols.
  • Page 13 Level 6 or stronger winds. SUNGROW shall not be held liable for any damage to the device due to force majeure, such as...
  • Page 14 Perform operations considering ac- tual on-site conditions. • SUNGROW shall not be held liable for any damage caused by violation of gen- eral safety operation requirements, general safety standards, or any safety in- struction in this manual.
  • Page 15 User Manual 2 Safety Instructions Hoisting and Transportation Risk of personal injury or device damage due to incorrect operation! • Follow the procedure of work of heights when walking on the top of the product. • All hoisting and transportation must comply with the relevant codes and regula- tions of the nation/region where the project is located.
  • Page 16 2 Safety Instructions User Manual PV modules will generate lethal high voltage when exposed to sunlight. • Operators must wear proper personal protective equipment during electrical connections. • Before performing an electrical connection, be sure to disconnect the smart PV combiner box and use measuring equipment to ensure that cables are voltage- free.
  • Page 17 User Manual 2 Safety Instructions Comply with the regulations related to the local grid during wiring. Operation When the product is working: • It is strictly forbidden to touch the live parts of the product. Otherwise, an elec- tric shock may occur. •...
  • Page 18 Do not open the cabinet door of any component of MV Grid-connected PV Inverter on sandy and windy days or when the relative humidity exceeds 95%. If some devices need to be replaced during operation and maintenance, please contact SUNGROW.
  • Page 19 To avoid the risk of electric shock, do not perform any other maintenance opera- tions beyond those described in this manual. If necessary, contact SUNGROW for maintenance. Otherwise, the losses caused are not covered by the warranty.
  • Page 20 Product Description Product Introduction The MV Grid-connected PV Inverter, designed and manufactured by SUNGROW, is mainly applied to medium and large-scale PV power plants. The MV Grid-connected PV Inverter can meet the requirements of modular design and quick installation for medium and large- scale PV power plants, and can ensure long-term, reliable, and safe feed-in operation.
  • Page 21 User Manual 3 Product Description * The figure is for reference only. And the actual product received shall prevail. Name Description Convert the DC current generated by PV modules Inverter units into low-voltage AC current. Convert the low-voltage AC current output by the Transformer inverter units into medium-voltage AC current.
  • Page 22 3 Product Description User Manual Name Top air inlet Indicator panel DC knob switch. Disconnect the DC load switch. Emergency stop button. In case of emergency, press this button to discon- nect the AC circuit breaker and DC load switch. Base LED Indicator table 3-1 Indicator Status Description...
  • Page 23 User Manual 3 Product Description * The figure is for reference only. And the actual product received shall prevail. Description Name Disconnect it before maintenance and repair. Maintenance switch QS2 Control the on/off of the DC side circuits of the in- DC load switch QS1 verter unit.
  • Page 24 3 Product Description User Manual 3.3.3 Main Parts of Transformer The transformer is equipped with multiple protective devices such as the oil temperature gauge, the pressure gauge, and the oil level gauge. Graphics Description Name Oil level indicator Indicate the level of stored oil in the transformer. Off-load tap-changer Adjust the output voltage of the transformer.
  • Page 25 User Manual 3 Product Description Graphics Description Name The alarm threshold is 100 ℃. An alarm signal is sent if the oil temperature reaches 100 ℃. Oil temperature gauge The tripping threshold is 105 ℃. A tripping signal is sent if the oil temperature reaches 105 ℃. The MV load switch to control the on/off of the circuits between the AC side of the MV Grid-con- MV load switch...
  • Page 26 Read this manual carefully before any operation on the product. Do not dispose of this product as household waste. SUNGROW shall not be held liable for any equipment damage or safety incident caused by failure to observe the warning signs.
  • Page 27 User Manual 3 Product Description Do not tear or damage the warning signs, and replace them immediately if they are blurry or damaged.
  • Page 28 Transport and Storage Precautions Failure to transport and store the product in accordance with the requirements in this manual may invalidate the warranty. Transportation Requirements In the whole process of loading, unloading, and transport, follow strictly the appli- cable safe operating procedure in the country/region where the project is located. Tool and Personnel Requirements •...
  • Page 29 User Manual 4 Transport and Storage Pre-transport route inspection should cover the following items: road condi- tions, height limits, actual heights, width limits, actual widths, weight limits, traf- fic restrictions, and potential obstructions. • In most cases, the total weight of a truck that carries the product will exceed the general weight limit on the road.
  • Page 30 For a product shut down/stored for over six months, inspect its electrical components (IGBT module, DC fuses, fans, etc.), and take dehumidification and dedusting measures for the whole product. For detailed operation, please contact SUNGROW. • The UPS and their batteries must be charged once every six months after leaving the...
  • Page 31 If there are prob- lems with the above inspection items, do not install the product and contact SUNGROW in time.
  • Page 32 5 Mechanical Mounting User Manual Improper hoisting may cause personal injury! • It is strictly prohibited to stand within 10m outside the operating area (i. e., under the boom and the hoisted machine) to avoid casualties. • Only professional personnel can operate the product, and be sure to wear per- sonal protective equipment when operating.
  • Page 33 • Visually check the product for any damage. If any problems are found or there is any question, please contact the forwarding company or SUNGROW. Only install the product when it is complete and intact. Before installation, ensure that: •...
  • Page 34 5 Mechanical Mounting User Manual 5.3.2 Foundation Given that the installation site has been decided and the foundation has been set up before the arrival of the product, details on these two items will not be included in this manual. •...
  • Page 35 5 Mechanical Mounting Surrounded by Obstructions or Heat Sources Surrounded by PV Arrays Required Distance d1 Required Distance d2 Model SG3150UD-MV-US ≥10m ≥5m SG4400UD-MV-US If there is any other device within 10m of MV Grid-connected PV Inverter, please consult with SUNGROW.
  • Page 36 5 Mechanical Mounting User Manual Hoisting and Fixing 5.4.1 Safety Precautions Safety instructions Perform operations in strict accordance with the local safe operating procedures relevant to the country or region, including but not limited to: • Stop hoisting immediately in severe weather conditions, such as heavy rain, fog, or strong winds.
  • Page 37 Before hoisting, select an appropriate crane with sufficient load capacity based on an evaluation by a qualified hoisting service provider to ensure operation safety. SUNGROW shall not be held liable for any damages resulting from the use of inap- propriate cranes.
  • Page 38 5 Mechanical Mounting User Manual figure 5-2 Shackle schematic figure 5-3 Hook schematic Hoisting devices The hook, slings, and shackles shown in the figure above should be prepared separately by the customer. The specifications of the hoisting devices must meet the following requirements:...
  • Page 39 User Manual 5 Mechanical Mounting Specification Quantity Item The hoisting rope can be rope or nylon bag, the ten- sile strength of the rope shall not be less than 1670 MPa, and the line diameter shall not be less than 32 Hoisting rope Hoisting rope length shall not be less than 2.5 m.
  • Page 40 5 Mechanical Mounting User Manual 5.4.4 Fixing Hoist the product to the intended location and fix it. Fixed by Welding Secure the bottom of the product to the foundation by welding. Take proper measures to pre- vent the welding point from corrosion after welding. Fixing by L mounting parts Fix the fixing point at the bottom of MV Grid-connected PV Inverter (shown as A below) with the existing operating platform using L mounting parts.
  • Page 41 User Manual 5 Mechanical Mounting...
  • Page 42 Electrical Connection Precautions • Before electrical connections, please make sure that MV Grid-connected PV In- verter is not damaged, otherwise, it may cause danger! • Before making electrical connections, check and confirm that the cables are all intact and well-insulated. Poor insulation or cable damage may result in safety hazards.
  • Page 43 User Manual 6 Electrical Connection Sand and moisture penetration may damage the electrical equipment in the prod- uct, or affect their operating performance! • Avoid electrical connections during sandstorms or when the relative humidity in the surrounding environment is greater than 95%. •...
  • Page 44 6 Electrical Connection User Manual • Whenever necessary, wear proper protective equipment such as goggles, insu- lating gloves, and insulating shoes, and take all necessary auxiliary protective measures to ensure the safety of the personnel and the equipment. • Before operating the product, check and ensure that the tools to be used have undergone regular maintenance.
  • Page 45 User Manual 6 Electrical Connection 1 – Inverter Unit 2 — Transformer 3 — Power Distribution Cabinet table 6-1 Interface Description Description Recommended Cable Specifications DC input port 750MCM (400 mm ) at most AC output port 2/0 AWG — 1250 MCM (70 mm —...
  • Page 46 6 Electrical Connection User Manual Heat gun Torque screwdriver Wire stripper Hydraulic clamp Torque wrench Multimeter Electric drill Screwdriver Protective gloves Goggles Insulated shoes Protective clothing Hard hat 6.3.2 Open Product Door Step 1 Remove the M16 bolts from both the upper and lower ends of the diagonal beams, and the M12 bolts from both the upper and lower ends of the vertical beams on the product.
  • Page 47 User Manual 6 Electrical Connection Step 2 Open the cabinet door and then pull out the key. Step 3 Fix the doors of the inverter unit cabinet and power distribution cabinet. Step 4 Remove the protective cover of the wiring area. - - End 6.3.3 Cables The cables must meet the following requirements:...
  • Page 48 6 Electrical Connection User Manual • AC output cables of three phases must be of the same specifications and materials. • Check the insulation of all AC output cables according to the applicable local rules. • Only flame-retardant cables can be used. Cables used shall comply with the requirements of local laws and regulations.
  • Page 49 AC cables, DC cables, and communication cables. • Both grounding terminals on the side of the product must be connected to the protective grounding points reliably. SUNGROW shall not be held liable for any damage caused by the violation. •...
  • Page 50 6 Electrical Connection User Manual Note the following during ground connection: • Observe specific codes and regulations of the country/region where the project is located to perform ground connections. • All grounding connections inside the MV Grid-connected PV Inverter must be secure and reliable.
  • Page 51 User Manual 6 Electrical Connection 1: Heat shrink tubing 2: OT/DT terminal DC Input Connection The PV arrays will generate lethal high voltage when exposed to sunlight. Respect all safety instructions listed in relevant documents about PV arrays. • Make sure the PV array is well insulated to the ground before connecting it to MV Grid-connected PV Inverter.
  • Page 52 6 Electrical Connection User Manual • Observe all safety instructions specified by the manufacturer for the PV mod- ules at the site. • To ensure the stable and efficient operation of the whole system, it is recom- mended that the PV modules attached to the same MV Grid-connected PV Inver- ter be identical in manufacturer and model, and the number of PV modules connected in series in each input should be the same.
  • Page 53 User Manual 6 Electrical Connection Step 4 Move the insulation board upward to its original position and install the two fixing screws. Step 5 Finally, install the positive DC cables. - - End * The figure is for reference only. The product received may differ. 6.5.3 Procedure Step 1 Lead the cable into the wiring area through the inlet hole, and mark the cable polarity.
  • Page 54 6 Electrical Connection User Manual Step 4 Secure the OT/DT terminal to the copper bar by M12 x 45 bolts with a tightening torque of 60- 70 N.m. • If copper wires are used, fasten the bolt assembly as shown below. figure 6-2 Copper Wire Connection •...
  • Page 55 User Manual 6 Electrical Connection Step 5 Pull the cable back slightly after wiring to ensure that the cable is long enough. • Ensure that the selected terminal can directly contact the copper bar. If there are any problems, contact the terminal manufacturer. •...
  • Page 56 6 Electrical Connection User Manual Step 2 Lead external cables inside through the bottom cable entries. Each of the three-phase (phase H1, phase H2, and phase H3) cables is led inside through the same cable entry. Step 3 Prepare the terminals and install them tightly, where reference can be made to the installation manual of the cable connector.
  • Page 57 User Manual 6 Electrical Connection Disc spring Copper bus Cable lug Bolt(M12) Flat washer washer - - End Further Operations 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 58 6 Electrical Connection User Manual Communication Connection 6.7.1 RS485 Communication Overview There is an RS485 communication terminal block inside the power distribution cabinet. table 6-2 Port Mark and Definition (Example) Marks Plug-compatible Devices Smart PV combiner box, meteo station, electricity Reserved RS485 meter, transformer, etc.
  • Page 59 User Manual 6 Electrical Connection Connect external monitoring devices to the Ethernet port by a CAT-5e cable. Power Supply Connection The power distribution cabinet is divided into two versions: 5KVA and 40KVA. The actual MV Grid-connected PV Inverter received may be equipped with one of these versions, and the specific agreement shall prevail.
  • Page 60 6 Electrical Connection User Manual figure 6-4 40KVA power distribution cabinet table 6-3 Take 40KVA power distribution cabinet as an example Cable Size (AWG) Name Off-grid commissioning power distribution switch Control switch for auxiliary transformer Control switch for 120Vac power supply Control switch for power socket Reserved for 120Vac power supply QF5-QF7...
  • Page 61 User Manual 6 Electrical Connection The external power supply wiring diagram for 5KVA power distribution cabinet is only QF3-QF12, and the rest of the layout is the same as 40KVA. 6.8.3 Recommended Cables Installation The Ethernet and terminal blocks cables in the power distribution cabinet are recommended to be wired as shown in the following figure.
  • Page 62 6 Electrical Connection User Manual Check After Wiring 6.9.1 Inspection Check the wiring thoroughly and carefully when all electrical connections have been completed. • Seal the gap between cables and the wiring holes with fireproof and waterproof materials. • Put all protective covers back in place firmly. When the wiring is completed, check for the wiring correctness and then seal the gap between cables and inlet and outlet holes with fireproof/waterproof materials such as fireproof mud to prevent foreign matter or moisture from entering and af-...
  • Page 63 User Manual 6 Electrical Connection Step 2 Lock the cabinet door and pull out the key. Ensure all doors are closed and locked. Failure to do so may increase the risk of equipment damage due to dust and water ingress. Electric shock hazard! Be sure to lock the cabinet door.
  • Page 64 Powering Up and Powering Down Safety Instructions When the product is working: • It is strictly forbidden to touch the live parts of the product. Otherwise, an elec- tric shock may occur. • It is strictly prohibited to disassemble any parts of the product. Otherwise, an electric shock may occur.
  • Page 65 User Manual 7 Powering Up and Powering Down figure 7-1 Remove Film at Air Inlet of the Inverter Unit figure 7-2 Remove Film at Air Outlet of MV Grid-connected PV Inverter Films Distribution Area of Power Distribution Cabinet figure 7-3 Remove Film at Air Inlet and Outlet of Power Distribution Cabinet * The figure is for reference only.
  • Page 66 7 Powering Up and Powering Down User Manual 7.2.2 Adjusting Off-Load Tap Changer Adjust the output voltage of the transformer. When operating the off-load tap changer, en- sure that the transformer is in a non-excitation state, that is, the high and low voltage sides of the transformer are uncharged.
  • Page 67 User Manual 7 Powering Up and Powering Down Remove the Locking Device Open the cap A 7.2.4 Removing Foam Part from Oil Thermometer Remove the protective cover on the oil thermometer and remove the foam parts in the pro- tective cover before MV Grid-connected PV Inverter is officially put into operation. After removal, re-install the protective cover.
  • Page 68 7 Powering Up and Powering Down User Manual Device Source Clean hoses and oil tank Cleaning cloth Wrench Adjustable wrench Not included in the scope of supply Hose connector Oil barrel Oil extractor pump Step 1 Use a wrench to remove the cap from the oil drain valve. Step 2 Connect one end of the drain hose to the position of the valve cap.
  • Page 69 User Manual 7 Powering Up and Powering Down • Check whether the fuse is installed in the AC SPD. 7.3.2 PV Array The DC side voltage shall not exceed the maximum DC voltage allowed for MV Grid-con- nected PV Inverter. Otherwise, MV Grid-connected PV Inverter may be damaged and even cause safety accidents.
  • Page 70 7 Powering Up and Powering Down User Manual Step 2 Turn on the external power supply equipment switch (which is, the QS9 switch inside the power distribution cabinet), and close the door. Step 3 Turn on the MV load switch, and close the door. Step 4 Send a shutdown command through the WEB to shut down MV Grid-connected PV Inverter.
  • Page 71 User Manual 7 Powering Up and Powering Down - - End 7.5.2 Unplanned (Emergency) Powering Down Step 1 Press the emergency stop button on the DC side. Upon pressing the emergency stop button, only the AC circuit breaker and DC load switch will open.
  • Page 72 O&M on WEB It is recommended to perform O&M on the WEB interface after the device is powered on. Communications Diagram The wiring between the internal devices of MV Grid-connected PV Inverter has been com- pleted before delivery. Connect the Laptop with the switch inside the power distribution cabi- net with the CAT-5e cable on site.
  • Page 73 User Manual 8 O&M on WEB Step 5 Click to enter the login interface. Step 6 Enter the password and click Login to enter the interface as a general user. PC password: pw8888. After the initial login, please change the password in a timely manner to avoid pop-up modify password prompts.
  • Page 74 8 O&M on WEB User Manual Step 2 Click in the upper-right corner of the interface to view information such as the name and time of the fault event. - - End 8.3.4 Boot/Shutdown Do not restart the equipment through the WEB system if there is a Module fault. In such cases, perform an inspection after powering off the equipment, ensure there is nothing abnormal, and then power it on again.
  • Page 75 User Manual 8 O&M on WEB Step 2 Select a device in the left device list in the function display area. Click “Operation Parame- ters” on the right. enter a value in “Current Value”, and then click “Settings” Click “Configure Synchronization”to synchronize the settings to other devices of the same type.
  • Page 76 8 O&M on WEB User Manual Exit Method Click and select Logout in the upper right corner of any interface.
  • Page 77 Main Function Operation Mode 9.1.1 Mode Change After being energized, MV Grid-connected PV Inverter switch among different modes as shown in the figure below. figure 9-1 Operation modes change is the DC input voltage of the PV array. Start is MV Grid-connected PV Inverter DC side startup voltage. 9.1.2 Operation Mode Description Stop This is the initial state of the inverter unit.
  • Page 78 9 Main Function User Manual Startup This is the transient process between the Initial Standby mode and the Run mode. Once the Startup mode is complete, inverter unit will start powering the grid. In this mode, inverter unit converts the DC energy into AC energy and feeds it to the grid by way of MPPT.
  • Page 79 User Manual 9 Main Function Alarm Run In Alarm Run mode, inverter unit can keep running but send alarm signal. User can check the latest history alarm information through “Function”->”History information”->”his alarm”. Inverter unit automatically turns to Run mode when the alarm is removed. Emergency Stop Button Functions The emergency stop button is located on the inverter unit.
  • Page 80 9 Main Function User Manual Step 4 Click Next to find the page with “Trip” and select “Enable” . Before the MV Grid-connected PV Inverter is put into operation again, set the parameter “Trip” as “Disable” first, then close all the DC load switches of the MV Grid-connected PV Inverter.
  • Page 81 User Manual 9 Main Function Once the amplitude and phase values from PT1 and PT2 are consistent, the control unit closes the circuit breaker QF1, ensuring a smooth grid connection with no inrush currents. figure 9-3 Principle of Control Derating Protective Once the transformer oil temperature exceeds 95°C, the MV Grid-connected PV Inverter au- tomatically derates to maintain continuous power generation, preventing yield loss due to a shutdown.
  • Page 82 9 Main Function User Manual Transformer Protection SCU collects transformer oil temperature, oil level, and oil pressure signals in real time. If any of these signals exceeds the preset thresholds, the MV grid-connected PV inverter shuts down and sends a fault signal to the backend.
  • Page 83 • Whether MV Grid-connected PV Inverter limits the output of active power If the problem still persists or there are any other questions, please contact SUNGROW. It would be helpful if the following information is provided during a call: •...
  • Page 84 In this case, do not attempt to power it off and try to restore MV Grid-con- nected PV Inverter, instead, contact SUNGROW personnel for the support. AC current Check the grid for anomalies. Check AC current is...
  • Page 85 User Manual 10 Troubleshooting Fault Name Fault Cause Fault Level Corrective Method 1. Use a thermometer to check whether the current ambient temper- ature is within the temperature range advertised by MV Grid-connected PV Inverter. 2. Check whether the air inlet of MV Reactor The temperature of Grid-connected PV Inverter and in-...
  • Page 86 10 Troubleshooting User Manual Fault Name Fault Cause Fault Level Corrective Method 1. Check whether the DC side volt- age of MV Grid-connected PV Inver- ter is short-circuited, whether the Voltage exists be- input voltage exceeds the allowable tween the positive range, and whether the grid voltage and negative poles is abnormal.
  • Page 87 User Manual 10 Troubleshooting Fault Name Fault Cause Fault Level Corrective Method 1 Check whether the protection pa- rameters in Parameter Settings -> Protection Parameters meet the grid standards of the location where MV Grid-connected PV Inverter is installed. The grid voltage is Grid over- 2 Disconnect the AC circuit breaker higher than the set...
  • Page 88 10 Troubleshooting User Manual Fault Name Fault Cause Fault Level Corrective Method 1 Check whether the internal and ex- ternal power supply control switches of MV Grid-connected PV Inverter are closed or disconnected at the same time. If they are closed at the same time, please disconnect one of the Control The control power...
  • Page 89 User Manual 10 Troubleshooting Fault Name Fault Cause Fault Level Corrective Method 1. Refer to the troubleshooting meth- od of "DC SPD fault" to conduct pre- liminary troubleshooting. 2. Check whether the micro circuit The AC side SPD breaker is connected in series with of MV Grid-con- Important AC SPD fault...
  • Page 90 10 Troubleshooting User Manual Fault Name Fault Cause Fault Level Corrective Method 1. Check whether cables on the AC and DC sides of MV Grid-connected AC side current of PV Inverter are loose. MV Grid-con- AC over- Important 2. Check whether the insulation nected PV Inverter current layer of cables is damaged.
  • Page 91 User Manual 10 Troubleshooting Fault Name Fault Cause Fault Level Corrective Method 1 Check the DC cables. Check whether the positive ground- ing cable of each DC branch is damaged. Check whether the DC cable resist- Grounding A grounding fault Important ance to the ground is normal.
  • Page 92 AC cabinet. Clean it if necessary. The fuse on the Check whether the DC fuse is blown. DC fuse DC side of MV Secondary If so, please contact SUNGROW to anomaly Grid-connected PV replace the fuse. Inverter fails. The three-phase Current Un-...
  • Page 93 HVRT or operation voltage and low LVRT. voltage. If the fault/alarm cannot be cleared following the above corrective methods and still persists, please contact SUNGROW directly. Fault Name Fault Cause Fault Level Corrective Method The AC switch is...
  • Page 94 "Cor- Replace the communication adapter rective Method”. and try again if the communication adapter does not match. If the fault is not caused by the fore- going reasons and still persists, please contact SUNGROW as soon as possible.
  • Page 95 Method”. If the fault is not caused by the fore- going reasons and still persists, please contact SUNGROW as soon as possible. 1. Export data in batches multiple The amount of data ex- Fail to export measur- times.
  • Page 96 11 Routine Maintenance 11.1 Safety Instructions Risk of MV Grid-connected PV Inverter damage or personal injury due to incorrect service! • Disconnect the switches between the product and all power supplies before maintenance. • After MV Grid-connected PV Inverter is powered off for 5 minutes, measure the voltage and current with measuring equipment.
  • Page 97 Otherwise, damage may be caused to the product! To avoid the risk of electric shock, do not perform any other maintenance opera- tions beyond those described in this manual. If necessary, contact SUNGROW for maintenance. Otherwise, the losses caused are not covered by the warranty.
  • Page 98 11 Routine Maintenance User Manual 11.2 Inspection After Power Off While the product is operating, do not turn off any AC- or DC-side switches directly. Otherwise, an electrical arc may occur, which may then damage the switch or even MV Grid-connected PV Inverter. During the installation and operation of the product, ensure the positive or nega- tive of the PV string is not short-circuited to ground.
  • Page 99 User Manual 11 Routine Maintenance 11.3 Maintenance Period 11.3.1 Maintenance (Every Three Years) Item Check method • Oil thermometer: Alarm temperature and tripping temperature. • Pressure relief valve: Check whether the pressure re- lief valve is in good contact. Monitoring and protective equipment of the transformer •...
  • Page 100 11 Routine Maintenance User Manual 11.3.2 Maintenance (Every Two Years) Item Check method Check the following items, and correct immedi- ately those failing to meet the relevant requirements: • Check whether there is any damage or deforma- tion of MV Grid-connected PV Inverter and inter- nal equipment.
  • Page 101 User Manual 11 Routine Maintenance 11.3.3 Maintenance (Every Year) Item Check method Check the following items, and correct immediately those fail- ing to meet relevant requirements: • Check whether there are flammable objects on the top of MV Grid-connected PV Inverter. •...
  • Page 102 11 Routine Maintenance User Manual Item Check method • Check the running status of fans. • Check whether the fan blade rotates smoothly. • Check whether there is abnormal noise during the operation of the fans. Screw Check whether internal screws fell off. Check the following items, and correct immediately those fail- ing to meet relevant requirements: •...
  • Page 103 User Manual 11 Routine Maintenance Item Check method Check the temperature of the heat sink and the amount of dust accumulated. Clean heat-dissipation IGBT modules with a Air inlet and outlet vacuum cleaner if necessary. • Carry out regular inspection for corrosion of all metal components.
  • Page 104 11 Routine Maintenance User Manual Procedure Step 1 Use a screwdriver to remove the M5 fixing screws for the first maintenance. Step 2 Pull the spring plunger at both ends of the filter at the air inlet outward and tilt the filter down- ward to remove it.
  • Page 105 User Manual 11 Routine Maintenance Step 1 Remove the M5 bolts on the sealing plate between MV Grid-connected PV Inverter and the transformer, and remove the sealing plate. Step 2 Pull out the spring plunger on the filter at the air outlet, take out the air outlet filter, and clean Step 3 After cleaning, install the filter in reverse steps.
  • Page 106 11 Routine Maintenance User Manual If there is visible damage on the cotton filter, it needs to be replaced with a new one. 11.4.4 Cleaning Air Outlet of Power Distribution Cabinet Step 1 Pull downward the spring plunger on the air outlet at the bottom of the power distribution cabinet.
  • Page 107 User Manual 11 Routine Maintenance Check the appearance of the product: Case 1: Erasable traces Case 2: Indelible traces Case 3: Broken primer • Check whether the protective paint sprayed on the casing of the product fell off or peeled off. If so, repair it timely. •...
  • Page 108 11 Routine Maintenance User Manual Step 3 Perform paint repair for the scratched parts with a soft brush after the surface is dried; brush the paint as uniform as possible. - - End 11.4.6.3 Broken Primer Tools Name Source Abrasive paper Cleaning cloth Water Beyond the scope of supply...
  • Page 109 User Manual 11 Routine Maintenance Step 4 Perform paint repair for the damaged parts with a soft brush after the primer is dried, and brush the paint uniformly. - - End 11.4.7 Checking Door Locks and Hinges Check if the door locks and hinges of MV Grid-connected PV Inverter can be used normally after cleaning.
  • Page 110 11 Routine Maintenance User Manual Step 6 Identify the faulty fuse,use a socket wrench to unscrew the fastening bolt of the fuse to be replaced,and remove the faulty fuse. Step 7 Secure the new fuse with M10×30 bolts with a tightening torque of 34 - 40 N.m. - - End 11.5.2 Replacing Off-grid Commissioning Fuse Step 1 Open the lower cabinet door at the rear of the inverter unit.
  • Page 111 User Manual 11 Routine Maintenance Step 2 Find the DC SPD fuse on the left side of the inverter unit (see "3.3.2 Internal Structure of the Inverter Unit"for its location). Step 3 Open the fuse holder. Remove the old fuse and install a new one. The specifications of the new fuse should be the same as those of the old fuse.
  • Page 112 11 Routine Maintenance User Manual Step 5 Unscrew the 10 and 8 M6 screws on the left and right fuse holders, remove the fuse cover, remove the old fuse, and install the new fuse.(Please see "11.5.2 Replacing Off-grid Com- missioning Fuse" for how to install fuses.) Step 6 Reinstall the cover of the fuse holder and the baffle.
  • Page 113 User Manual 11 Routine Maintenance Procedure Step 1 Remove the bolts from the top door on the AC cabinet and open the cabinet door. Step 2 Remove the M5 bolts between the fan fixing plate and the bottom platform and take down the fan.
  • Page 114 6 to 32 uppercase letters, lowercase letters, numbers and special characters. If you forget the password or you want to restore factory settings, contact SUNGROW. 12.2 Port Protection and Isolation Ensure that MV Grid-connected PV Inverters are installed such that the network zone has ingress protection and minimized port exposure.
  • Page 115 User Manual 12 Cyber Security Protocol Ensure that all RS-485 data cables are inspected periodically for damage, wear and tear.
  • Page 116 13 Cybersecurity Best Practice It’s important to locate MV Grid-connected PV Inverter in a secure network zone (e. g., SCADA network or PCN), that is blocked from direct communication with the Internet and/or Corporate IT networks by network security devices (e.g., firewalls). This network isolation concept is a best practice recommendation based on the Purdue Reference Model (PRM), an industry leading Industrial Control System (ICS) cybersecurity model adopted by standards and frameworks such as the ISA...
  • Page 117 14 Appendix 14.1 Technical Parameters SG3150UD-MV-US SG4400UD-MV-US Model Input (DC) Max. PV input voltage 1500 V Min. PV input voltage / Start- 875 V / 915 V 915 V / 955 V up input voltage 250 A - 630 A...
  • Page 118 14 Appendix User Manual SG3150UD-MV-US SG4400UD-MV-US Model 0.6 kV /( 12–35 ) kV 0.645 kV / 34.5 kV LV / MV voltage Dy 1 ( Optional: Dy 11, Yny 0, YNd1 ) Transformer vector KNAN (Optional: ONAN) Transformer cooling methods...
  • Page 119 After replacement, unqualified products shall be processed by SUNGROW. • The customer shall give SUNGROW a reasonable period to repair the faulty device. Exclusion of Liability In the following circumstances, SUNGROW has the right to refuse to honor the quality guarantee:...
  • Page 120 The fault or damage is caused by installation, repairs, modification, or disassembly per- formed by a service provider or personnel not from SUNGROW. • The fault or damage is caused by the use of non-standard or non-SUNGROW compo- nents or software. •...
  • Page 121 Sungrow Power Supply Co., Ltd. www.sungrowpower.com...

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