SG1K5TL-31 PV grid-connected inverter user manual
Contents
1. Fig 2 1 Inverter Applied in the PV Power System Inverter SG1K5TL 31 B Utility grid Any other or additional usage is not permitted except the intended use The inverter must only be connected to a public utility grid Local loads home appliance lights motor loads etc can not be connected between the inverter and the AC circuit breaker 10 Product Introduction 2 2 2 Principle Description The principle design of the SG1K5TL 31 a transformer less and grid connected inverter can be known from the block diagram Fig 2 2 The PV array voltage connected to the inverter input is always positive and is initially regulated by the Boost circuit and then converted into alternating current by the full bridge circuit inverter The AC connection to the local utility grid is via 3 wires for a single phase feed point Additionally there is a MPP tracker to ensure that maximum power from PV array can be utilized Inside the inverter protective circuit to can trigger AC relay if required for guaranteeing inverter safely operation and person Inverter provides standard interface RS485 for communication User can look up running data and configure parameters through human computer interaction interface LCD display panel Functional Safety and Protective Circuit BA oe a Elit n s Teu Ae an a Cote DC Switch Fig 2 2 Main Circuit Diagram of SG1K2. 63 8 0 5 PIFMWare Version esse sale a ded sale a duis 64 8 8 6 Protective Parameters 5 65 8 8 7 Communication Parameters 66 9 9 Inverter Sat and top a 67 Technical Data i E nee ne a De en a a 69 EXCIBSIOD OH EB Ai reat eee 71 ADOU es e ae nase een ta da 72 AU Oh em 72 SAFETY AND PRODUCT INFORMATION OR INSTALLER AND USER safety Instructions About This Chapter This chapter provides crucial safety instructions about SG1K5TL 31 Please read Safety Instructions carefully before any work with inverter SG1K5TL 31 user Manual IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS Inverter SG1K5TL 31 has been designed and tested strictly according to the international safety regulations However for electrical and electronic equipment safety instructions related to electrical device must be complied with during installation commissioning operation and maintenance Operation or work performed incorrectly may result in damage to The life and well being of the operator or a third party The inverter and other properties that belong to the operator or a third party Therefore in order to reduce the risk of personal injury inverter damage or other pr
3. No Table 3 1 Description of Installation Flow Unpacking the inverter and inspection Section 4 1 Read this manual especially the section on safety instruction Chapter 1 Choose the best installation site Section 4 4 Connect inverter to PV arrays Section 5 5 Connect inverter to utility grid Section 5 6 Connect the PV system to ground Section 5 7 Install the inverter against the chosen wall Section 4 5 Connect communication cable for inverter optional Section 5 9 Examine before commissioning Section 6 1 Start up the inverter for the first time Section 6 2 18 Installing Inverter onto Wall About This Chapter This chapter provides information about choose installation site and gives step by step procedures to install the inverter onto the wall And related safety instructions are also included 19 SG1K5TL 31 user Manual 4 1 Unpacking and Inspection The unit is thoroughly tested and inspected strictly before delivery Although sturdy packaging is used damage may still occur during shipping Check the packing for any visible damage upon receiving Check the inner contents for damage after unpacking Check the completeness of delivery contents according to the supplied packing list If there is visible damage to the packaging or the inner contents or if there is something missing contact the unit dealer Do not dispose of the original pac
4. n L1 Inverter 1 Inverter 2 Inverter n L2 Inverter 1 Inverter 2 Inverter n L3 Requirements e The sum of all inverters in parallel connection is limited to ten n L1 n L2 n L3 s10 e Inverters should be distributed as equally as possible between the three phases at the low voltage side with maximum unbalanced load of 4 6kVA e The rate voltage on the low voltage side of transformer must meet the inverter output electrical specification A neutral point is necessary and must lead outwards as neutral conductor As mentioned above in the three scenarios the total number of inverters is always less than or equal to TEN If there are inverters more than the limited value Inverters may not operate normally 37 SG1K5TL 31 User Manual 5 6 2 Assembling AC Cables to Connector Inverter is equipped with water proof direct plug in connectors for AC connection which mate with AC terminals at the bottom of the inverter NOTE L N and PE should be equipped with correctly colored cables for distinguishing Please refer to related standards about wiring color Step 1 Unscrew the water proof terminal in the following direction Step 2 Insert appropriately sized AC cables through water proof terminal Step 3 Strip off insulation layer of all AC cables The length of strip insulation is approximate 5mm Step 4 Fix all cables with screwdriver accordi
5. ENTER Stop 1 v Start Stop 1 Password 000 ENTER 2 lol Pro paras 1 EI e EB ENTER v Miz trot lal oh Please wait Error password Are you gure to get 117 A Invalid get ENTER A set 1t complete fault record P Start Confirmi Step Canfirm gt Lid EE Losd defsult gt Tine 09 26 08 lt Power ad BOO01kWh Password Fig 8 1 Menu Tree English 55 SGIK5TL 31 User Manual 8 4 Contrast Adjustment li Mr Stand bw Cont ras t lif 8 5 Current Running Information 1 Long press ESC V to enter into the Contrast adj menu from the default menu ESC W 2 Short press to decrease the setting a ENTER gt value and short press to increase the contrast value Users can view inverter running information conveniently as follows A A 0 amp ld 20 Stand b 56 a ESC V 1 Short press button to view current information 2 Short press
6. 19 4T 0npacking qood e stro Mete epe teeta als ewan Odean ate tta ios 20 oa ed s I LU 21 rel 22 24 Storage of IhVeltelr ii case ta att 23 4 5 Selecting Installation Location usu io ioa Seen es ae 23 2 6 f a Mn de Du s Dub us Med E 26 2 7 Installation enit Lau Has V RECO e d a Occ E 27 5 Electrical Connection ccccsccssscssccssccsssccssccssccssccsccssccssccssccscccssccsscsssccsscsscssses DO 5 1 General Satety InstruUclion sassiestes ee nenn 30 5 2 lerminals Desckiplianaes reelle 31 5 3 Specilicalions Of Cables kisi ir ls 31 5 4 Overview of Electrical Connection 22220022200020000000nn0 nenne nnnnnonnnnonnnnnnnennnnnenne 32 5 5 Connecting Inverter to PV Arrays eier 33 E 33 5 5 2 Assembling DC Cable to Connector ena rank Ann 34 9 0 0 DE WINING Procedure ansehen nie 35 5 6 Connecting Inverter to AC Grid nenne nenne nnnnennnnnennnnnennnnn nenne nnne sns n anres 36 90 EIS A 36 5 6 2 Assembling AC Cables to Connector 2 nn nnnnnn 38 56 SAC WINING Proced re t abes tai tages ol
7. a ESG W cursor and short press button to set the correct time Power adj value Real measured value E tot reading value 027 can be changed to negative symbol The adjustable range is from 9999 9999 kWh E tot after Power adj adjustment must not be negative Otherwise settings is not valid Operation of LCD Menu 8 8 8 4 Load Default A NOTICE If you perform the operation Load default all running information recorded will unrecoverable cleared and all parameters will return to the default value except protective parameters and time 1 Long press button ENTER gt to enter into sub screen 20 ENTER gt t0 select icon ENTER gt 2 Short press button Set param and long press button to confirm the selection 3 Short press ENTER gt to move cursor and short press ESC v to set the password 1111 ENTER gt to select icon ENTER 4 Short press button Svs param and long press button to confirm the selection 5 Short press button ENTER gt to select icon Load default and long press button ENTER gt to confirm the selection 6 Input password 1111 If users restart the inverter after Load default there is a language selection screen lil LCD Sc1K5TLV21 V2 E M 63 SG1K5TL 31 User Manual 8 8 5 Firmware Version User can not set th
8. appropriate protective parameters Ferid max 1 0Hz o Ferid min 4 OHZ Table 8 3 Protective Parameters Range Simple explanation Adjustable range Default value Vgrid max Maximum AC voltage 274V LN Minimum AC voltage Poco NEN Fgrid max Maximum AC frequency 50 2Hz 52 5Hz 51 5Hz 60 5Hz 62 5Hz 61 0Hz Fgrid min Minimum AC frequency 47 0Hz 49 5Hz 47 5Hz 57 0Hz 59 5Hz 59 0Hz 65 SG1K5TL 31 user Manual 8 8 7 Communication Parameters Settings 1 Long press button ENTER gt to enter into sub screen 2 Short press button ENTER to select icon Set param and long press button ENTER gt to confirm the selection ENTER gt 3 Short press to move cursor and short press ESC v 1111 to set the password 4 Short press button ENTER to select icon Com param and long press button 6 Com param ENTER gt to confirm the selection ESC Y 5 Short press button cursor and short press to set appropriate communication parameters Protocol 0 0 Modbus 1 Sumgrow A NOTICE Each inverter should have different address and have same baud rate to ensure good communication Address range 1 247 Baud rate 1200 2400 4800 9600 Default protocol Modbus 66 Operation of LCD Menu 8 8 9 Inverter Start and Stop 1 Long press button ENTER gt to enter into sub screen 2 Short press button ENTER gt
9. Grid Connection If several inverters are operated in parallel connection to grid there are different requirements according to different scenarios Scenario 1 Several inverters are operated in parallel connection to the single phase Low Voltage grid L N do Inverter 2 Inverter n Inverter 1 Requirements The sum of all inverters in parallel connection is limited to TEN Scenario 2 Several inverters are operated in parallel connection to the three phase Low Voltage grid 36 Electrical Connection 5 L1 L3 N il e Inverter 1 Inverter 2 Inverter n L1 Inverter 1 Inverter 2 Inverter n L2 Inverter 1 Inverter 2 Inverter n L3 Requirements The sum of all inverters in parallel connection is limited to ten n L1 n L2 n L3 s10 e Inverters should be distributed as equally as possible between the three phases with maximum unbalanced load of 4 6kVA Scenario 3 Several inverters are operated in parallel connection to low voltage side of MV transformer The high voltage side of MV transformer is connected to the Middle Voltage Grid Low voltage Side High voltage Side U2 nV ro U1 v2 m Br Vi w2 i mo FAA Wi N MV Transformer
10. inverter include DC connection AC connection and communication connection This should comply with the National Wiring Rules of Standard AS NZS 3000 The requirements in AS 4777 1 and AS NZS 3000 indicate that a DC isolator must be used before the inverter o o o D E Fig 5 2 Electrical Connection Diagram The maximum open circuit voltage of each PV string is 450V Solarinfo It can be ordered from Sungrow logger Remote PC User uses this device to monitor the whole PV svstem AC circuit Used as a protective device during electrical connection User equips breaker this device according to maximum output voltage and current Utilitv Grid Grid voltage is 230V 32 Electrical Connection 5 5 5 Connecting Inverter to PV Arrays 5 5 1 Safety As input of the inverter in the PV power system PV Arrays features should be paid attention to Please refer to PV module s data sheet When designing PV arrays following requirements should be met DANGER Lethal voltage exists Do cover the PV arrays with light tight materials Exposed to sunlight PV arrays will output lethal voltage NOTICE There is a risk of inverter damage Make sure that the maximum open voltage of each string is within DC input voltage range of the inverter Voltage over 450V can damage to
11. long press button to confirm the selection 3 Short press ENTER gt to move cursor and short press ESC v to set the password 1111 ENTER gt to select icon a ENTER gt 4 Short press button Svs param and long press button to confirm the selection ENTER select icon ENTER to 5 Short press button Time and long press button confirm the selection a ENTER gt 6 Short press button move cursor ESC YV and short press button to set the correct time SG1K5TL 31 user Manual 8 8 3 Deviation of Energy Settings If the accumulative value of E tot by inverter has deviation from the value in the external metering device you should adjust the parameter u 2t Stand by Power adj x Power adj u0001kWh 62 a ENTER 1 Long press button to enter into sub screen 2 Short press button ENTER to select icon Set param and long press button ENTER to confirm the selection ENTER gt 3 Short press to move cursor a ESC Ww and short press to set the password 1111 4 Short press button ENTER gt to select icon Svs param and long press button ENTER to confirm the selection 5 Short press button ENTER to select icon Power adj and long press button ENTER to confirm the selection 6 Short press button ENTER move
12. parameters include language time power adj load default firmware version 8 8 1 Language Settings The inverter supports three different languages English Chinese and Spanish Language can be configured as the following indication 1 Long press button ENTER gt to enter into sub screen ENTER gt to select icon a ENTER gt 2 Short press button Set param and long press button to confirm the selection ENTER t 3 Short press o move cursor and ESC Ww short press set the password Password 1111 4 Short press button ENTER gt to select icon Svs param and long press button ENTER to confirm the selection ENTER gt to select icon a ENTER 5 Short press button language and long press button to confirm the selection 60 8 8 2 Time Settings Operation of LCD Menu 8 ENTER gt 6 Short press button to select the chosen language If there is deviation between the time in the default screen and your local time you should perform the operation set time Where clock set is not 24 hour format setting is not valid o EAM 0 5 n it State Stand by Password 8000 6 Fu i pm rn U ri u J f kal U 09 26 08 61 a ENTER gt 1 Long press button to enter into sub screen ENTER to select icon a ENTER gt 2 Short press button Set param and
13. to ensure that the equipment interior is well cooled down During Electrical Connection DANGER Lethal voltage exists PV arrays will produce electrical energy when exposed to sunlight and thus can create an electrical shock hazard e Wiring of the PV arrays should only be performed by qualified personnel e PV modules should be covered by opaque materials during wiring All cables must be firmly attached undamaged properly insulated and adequately dimensioned SG1K5TL 31 user Manual During Inverter Operation DANGER There is a risk of inverter s damage or personal injury Do not disconnect DC connectors while the inverter is under AC load First de energize the equipment from dual power sources and verify that there is no voltage present There is a risk of burn Prevent from touching device hot parts such as heat sink during operation Only LCD display panel and DC switch can be touched during inverter operation Maintenance and Service A NOTICE e Any malfunction that may impair inverter safety functions must be repaired immediately before the inverter is restarted again e Inverter contains no owner serviceable parts inside Please contact local authorized personnel if any service work is required NOTE Servicing of the device in accordance with the manual should never be undertaken in the absence of proper tools test equipments and the more recent revision to the manual which is clearly
14. to make sure that there is no current Step 6 Release the locking part of DC connectors by pressing on the ribbing of the locking hooks with nipper pliers and pull outwards Step 7 Dismantle AC cables as the opposite procedures in 5 6 2 Assembling Cables to Connector 41 SG1K5TL 31 user Manual 5 9 Connecting Communication Cable 5 9 1 Monitoring System The inverter provides RS485 interface to communicate with remote PC or logger User can monitor the inverter s state via the following types of communication systems e Through RS485 interface Data logger Inverter Data logger Fig 5 4 Data Logger Collecting Data Through RS485 interface Data logger PC Inverter Fig 5 5 Communication with PC via Data Logger e Through RS485 interface RS485 232 converter PC Inverter Fig 5 6 Communication with PC and RS485 232 Converter 42 Electrical Connection 5 5 9 2 Connecting RS485 Cable RS485 is communication standard for bidirectional transmission of data between more than one inverter and a PC or a data logger If there is more than one inverter to communicate with a PC or a data logger it is crucial to configure communication parameters of each inverter See 8 8 7 Communication Parameters Settings And the maximum number of connected inverters in a daisy chain is dependent on the converter device Please refer to the corresponding manual A NOTICE RS485 bus requirem
15. 5TL 31 SG1K5TL 31 user Manual 2 3 Product Description 2 3 1 Product Appearance UD a Isometric View b Left View Fig 2 3 Product Description 1 LCD display panel A friendly human computer interaction interface Running data and configuration parameters are displayed in the LCD screen AC terminal Inverter feeds power via this terminal a 12 Product Introduction 2 2 3 2 Dimensions and Weight of Inverter Y Fig 2 4 Dimensions of Inverter Table 2 1 Dimensions Value 2 3 3 LCD Display Panel As a friendly human computer interface LCD display panel comprises LED indicators buttons and LCD screen e LEDs indicate the current state of the inverter e The current running information shown in the LCD screen e Malfunction records shown in the LCD screen e Inverter configuration by pressing the buttons RUN FAULTESCw ENT O00 Q T Fig 2 5 LCD Display Panel 13 SG1K5TL 31 user Manual 1 LCD LCD screen can display the current state of inverter current running screen information history information and parameters to be set They are RUN and FAULT User can observe two indicators to get indicators the current state of inverter Detailed definition is shown in Table 2 2 2 Buttons User can operate the LCD menu of the inverter via th
16. C v to turn pages E total Inverter produces power in total COs total reduce Weight E month Inverter produces power in current month h total total working hour of inverter Operation of LCD Menu 8 8 7 Fault Record a ENTER gt 1 Long press button to enter into sub screen 2 Short press button ENTER to select icon Fault record and long press button ENTER gt to confirm the selection ESC W 3 Short press to turn pages Explanation DC voltage exceeds maximum DC voltage of inverter DCvoltage is less than the lower limit input value AC voltage exceeds the upper limit value of grid voltage range AC voltage is less than the lower limit value of grid voltage range Bus voltage exceeds the allowable value There is malfunction in the sample circuit Grid frequency exceeds range Grid is unavailable or grid malfunction occurs PM fault occurs Temperature inside the inverter is too high NOTE Inverter SG1K5TL 31 an store at most 20 fault records The latest fault record number is always 01 The oldest fault record number is always 20 suppose there are 20 fault records 59 SG1K5TL 31 user Manual 8 8 Parameters Configuration NOTE If you want to set inverter s parameters you have to input correct password The default password is 1111 There are system parameters running parameters and communication parameters that users can set System
17. ESC v to turn pages P ac inverter output power E day energy is generated in current day E total energy has been generated in total CO2 total CO2 weight has been reduced in total E month energy has been generated in current month V grid grid voltage l grid grid current F grid grid frequency V dc DC voltage of PV string l dc DC current of PV string T day working hour of inverter in current day h total working hour of inverter in total Temp inner temperature inside the inverter State working status of inverter Operation of LCD Menu 8 User can also view inverter running information via Current inform menu a ENTER gt 1 Long press button to enter into sub screen 8 ENTER to select icon 2 Short press button Run inform and long press button to confirm the selection 3 Short press button ENTER to select icon Current inform and confirm the selection a ESC Y 4 Short press to turn pages 57 SG1K5TL 31 user Manual 8 6 Total Information li Mr Stand bw O Runinfom Mm 58 1 Long press button ENTER gt to enter into sub screen ENTER gt to select icon 2 Short press button Run inform and long press button to confirm the selection 3 Short press button ENTER to select icon Total inform and confirm the selection 4 Short press ES
18. SUNGROW SGIKSTL 31 PV Grid Connected Inverter User Manual SGIKS IL 31 UEN Ver 1 201112 Version 1 1 About This Manual Aim Thank you for purchasing the inverter SG1K5TL 31 from Sungrow We hope that the device will meet your satisfaction when you use it with your PV plant system This manual contains detailed product information operation instructions and safety instructions that must be understood and obeyed during installation and maintenance of the inverter Target Readers The manual is provided to people who need to install and operate the grid connected inverter How to Use This Manual Read this manual and other documents before any work with inverter The document must be stored with other documents and be available at all times The contents of this manual will be periodically updated or revised if necessary However discrepancies cannot be excluded Please refer to the actual product The latest version is available online at www sungrowpower com or from the usual sales channels Any suggestion question or criticism is always welcome No part of this document may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photographic magnetic or otherwise without the prior written permission of Sungrow Symbols Explanation Important instructions contained in this manual should be followed during installation operation and maintenance of
19. Sungrow 49 SG1K5TL 31 user Manual Type of fault Troubleshooting 1 Check whether AC circuit breaker is off 2 Check whether AC cables are all firmly connected 3 Check whether grid is cut off 4 f all conditions are OK and this malfunction still occurs in the LCD screen please contact with Sungrow Temp flt 1 Check whether AC output power exceeds rated power too much 2 Reinstall the inverter of appropriate position If you have any problems in operating on the inverter please contact us via service hotline 86 551 532 7834 532 7845 email service sungrow cn We need the following information to provide you the best assistance Type of the inverter Serial number of the inverter Fault name Simple description of the fault phenomenon 50 OPERATION INFORMATION OR INSTALLER AND USER 51 52 Operation of LCD Menu About This Chapter This chapter shows operation of LCD menu via buttons to check the records in the inverter and configure the parameters of the inverter 53 SG1K5TL 31 user Manual 8 1 Description of Button Function Inverter offers two buttons to look up running information and configure parameters Users should know the button functions before any operation onto inverter Table 8 1 Description of Button Function pecu Press less than two Move cursor upwards and downwards in the screen seconds or increase and decrease the setting value In the following te
20. and thoroughly understood Safety Instructions 1 DANGER There is a risk of inverter damage or personnel injury due to incorrect service work Always keep in mind that inverter is power supplied by dual power source PV arrays and utility grid Before any service work you should obey the following procedures e Disconnect inverter from the utility grid side first and then PV arrays e Wait at least ten minutes for inner capacitors discharge completely e Verify that no voltage and current present with appropriate testing device Keep non related person away A temporary warning sign and barrier must be posted to keep non related person away for any period while performing electrical connection and service Work Do not open the enclosure when the inverter is under voltage There is a highly unlikely risk of explosion in very specific cases of malfunction The housing will protect persons and property from such an explosion only if it is correctly sealed A NOTICE There is a risk of inverter damage if it is improperly serviced Use only accessories and spare parts approved by the inverter manufacturer And never modify the inverter or other components of the inverter Otherwise it Will lead to loss of any and all warranty rights N NOTICE There is a risk of inverter damage due to electrostatic discharge The printed circuit boards contain components sensitive to electrostatic discharge Wear a grounding wrist band
21. bleshooting of LED Indicator See 2 3 3 LCD Display Panel to know definition of LED s state Type of fault Troubleshooting LED indicators and 1 Disconnect the AC circuit breaker LCD cannot be lit 2 Rotate the DC switch to the OFF position 3 Check the polarity of DC input RUN indicator 1 Disconnect the AC circuit breaker goes out 2 Rotate the DC switch to the OFF position 3 Check the correctness of electrical connection of the inverter See 5 Electrical Connection 4 Check whether the voltage of DC input exceeds start up voltage of inverter 5 If all above conditions are OK please contact with Sungrow Fault indicator is lit 1 There is a fault which is not removed yet 2 Perform troubleshooting in according to fault type in LCD screen See 7 2 Troubleshooting of Faults in LCD Screen 3 If it can not be solved please contact with Sungrow 48 Troubleshooting 7 7 2 Troubleshooting of Faults in LCD Screen Type of fault Troubleshooting Vdc high Vac high F fault PM fault Disconnect the AC circuit breaker Rotate the DC switch to the OFF position Check the voltage of DC side Restart the inverter until the DC voltage returns to the allowable range Disconnect the AC circuit breaker Rotate the DC switch to the OFF position Check the voltage of grid side If local grid condition exceeds AC requirements of inverter reset the protecting
22. e See 5 5 2 Assembling DC Cable to Connector Step 2 Manually rotate the DC switch at the bottom of the inverter to the OFF position Step 3 Check the connection cable of one PV string for the correct polarity and that the maximum input voltage does not exceed 450V Step 4 Measure the DC voltage between the positive terminal of the PV string and Earth and the DC voltage between the negative terminal of the PV string and Earth If the two voltages are constant and not zero there is an insulation failure somewhere in this PV string Step 5 Plug the DC positive and negative connector into corresponding terminals If it makes a clicking sound DC connector has been attached to the terminals DC OFF TON e ji e ee 35 SG1K5TL 31 User Manual 5 6 Connecting Inverter to AC Grid 5 6 1 Safety Only after receiving prior approval from the utility company should you connect the inverter to the local utility grid A NOTICE The grid should meet these following requirements Otherwise the inverter will not work e Grid Voltage 174 274Vac e Grid Frequency 47 52 5Hz 57 62 5Hz The grid connection of inverter SG1K5TL 31 is made via 3 wires L N and PE Feeding power is always single phase via AC terminal at the bottom of the unit An appropriately sized AC circuit breaker is suggested as a protection equipment in AC connection as shown in Fig 5 2 Requirements of Inverter Parallel
23. e two buttons Detailed function is shown in Table 8 1 Table 2 2 Description of LED Indicators ja _ OM Inverter is not rumning 0 is not Inverter is not running FAULT 2 A malfunction occurs o A malfunction doesn t occur NOTE The background illumination of LCD screen will go out to save power if there is not button operation in one minute You can activate it by pressing any button 2 3 4 DC Switch The DC switch is designed for safely disconnecting the DC current if required The inverter works automatically if input and output meet the requirements If you want to interrupt running or if a malfunction occurs it can be rotated to the OFF position and then the inverter will cease N NOTICE Rotate the DC switch to the ON position again before restarting the inverter 14 INSTALLATION AND MAINTENANCE INFORMATION ONLY FOR INSTALLER 16 Installation Flow About This Chapter This chapter demonstrates installation flow from unpacking to successful commissioning SG1K5TL 31 user Manual The following diagram shows the installation flow of inverter for installer Please follow these procedures Start Unpacking and inspection Read user manual Mounting the inverter Electrical connection Check before commissioning Commissioning Troubleshooting Success Yes End Fig 3 1 Installation Flow Chart
24. ecessary please call us or check our website www sungrowpower com for the latest information However discrepancies cannot be excluded No guarantee is made for the completeness of these documents Please contact our company or distributors to get the latest version Guarantee or liability claims for damages of any kind are excluded if they are caused by one or more of the following Improper or inappropriate use or install of the product Installing or operating the product in an unintended environment Installing or operating the product when ignoring relevant safety regulations in the deployment location Ignoring safety warnings and instructions contained in all documents relevant to the product Installing or operating the product under incorrect safety or protection conditions Altering the product or supplied software without authority The product malfunctions due to operating attached or neighboring devices beyond allowed limit values In case of 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 rejects any liability for direct or indirect damages arising from the use of the Solarlnfo software This also applies to the provision or non provision of support activities Using the Solarlnfo software for commercial purposes is prohibited Decompiling decoding or destroying the original program includin
25. ector Packing list and test report Quality certificate 22 Installing Inverter onto Wall 4 4 4 Storage of Inverter If you want to perform decommissioning the inverter you should choose an appropriate location to store the inverter The unit must be stored in original package and desiccant must be left in the package The unit must be stored in a clean and dry place to protect against dust and moisture The storage temperature should be always between 25 and 60 And the storage relative humidity should be always between and 95 During the storage time periodically check whether any visible damage by rats Replace the package if necessary After long term storage local installer or service dept of Sungrow should perform a comprehensive test before connecting the inverter into PV power system 4 5 Selecting Installation Location Installation shall comply with local regulations and technical rules Installation shall comply with the relevant instructions of AS 4777 1 Selecting an optimal installation location for the inverter is decisive for its operating safety as well as it expected efficiency and service life 1 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 2 Install the unit where is accessible to install electrical connection or service 3 Do not
26. ents to ensure quality of communication e Shielding twist pair type e Shielding layer of RS485 bus should be single point grounding NOTE Solarinfo logger and RS485 232 converter are optional parts and can be ordered from Sungrow Data logger Inverter 1 Inverter 2 Inverter n pe a ope RERO ee ae Solarinfo logger NIN JA BENENNEN 2 c DR EAE P PT MT z c Step 1 A 1200 resistance is connected between RS485 A and RS485 B of the first inverter Step 2 Connect RS485 A of Inverter 1 to RS485 A of inverter 2 Step 3 Connect RS485 B of Inverter 1 to RS485 B of inverter 2 Step 4 Connect other inverters in the same way 43 SG1K5TL 31 user Manual Step 5 Connect RS485 cables of the last inverter to A1 and B1 port of Solarinfo logger e Datalogger Inverter 1 Inverter 2 Inverter n Ti E My TTC RS232 RS232 URSUS NN P ma Wee ESSO AAN S eT X s al RRR CAVA Bee eee Wi ees teed A TM Step 1 A 1200 re
27. etter to use a continuous irreversibly appropriately sized conductor bare to ground inverter Inverter 1 Inverter 2 Inverter n Miro PV String 1 I PV String 2 gt PV String n Mounting Frame of PV arrays Copper Bus Bar Grounding Electrode Grounding of PV Power System L N AC Circuit Breaker Inverter 00 L1 N ae PE nn AC Grounding Electrode Grounding of Inverter AC Side Fig 5 3 Grounding of Inverter 40 Electrical Connection 5 5 8 Disconnection of Inverter For maintenance work and repairs the inverter must be switched off In order to disconnect the inverter from the AC and DC power sources you should proceed with the following procedures Otherwise you will be exposed to lethal voltages or the inverter will be damaged Step 1 Disconnect the external AC circuit breaker and prevent it from connecting again Step 2 Rotate the DC switch to the OFF position NOTICE Please strictly follow the sequence of the above procedures Otherwise it will lead to unrecoverable inverter and human damage Step 3 Wait about ten minutes until the capacitors inside the inverter have discharged Step 4 Measure AC output of inverter at the AC circuit breaker is voltage free Step 5 Measure currents of all DC cables
28. g Solarlnfo software and the embedded software is prohibited 71 About Us Sungrow power supply is a China leading manufacturer of various power electronics products for renewable energy generation systems Our products include converters inverters battery chargers and other power supplies for distributable generation system in both grid connected and stand alone applications The power rating of Sungrow products covers from several hundred watt to large mega watt systems The pursuit of Sungrow is to help our customers acquire stable and clean power with minimum cost maximum reliability and enhanced safety Contact Information If you have any questions about this product our hotline will be happy to assist you Please keep the following data when contacting Sungrow Company Sungrow Power Supply Co Ltd Website www sungrowpower com Contact Mr Henry Director of International Trade Email info sungrow cn service sungrow cn No 2 Tianhu Rd New amp High Technology Industrial Development Zone Hefei Address P R China Zip 230088 Telephone 86 551 532 7834 86 551 532 7845 Fax 86 551 532 7856 72 SUNGROW Green and Effective Specifications subject to change without notice
29. install the inverter where contains flammable Td I materials or flammable gas in the vicinity of the unit installation Flammable material or gas near the installation 23 SG1K5TL 31 user Manual 4 Do not install the unit on wall of flammable materials Flammable wall material 5 Install the unit at eye level for easily buttons operation and display read 6 It is suggested that the inverter be installed vertically with upside up for good heat dissipation ii A A 7 Never install the inverter horizontally or with a forward tilt or with a backward tilt or even with upside down With a forward tilt With a backward tilt Horizontally With upside down IE x D X D 8 The inverter unit with IP65 can be installed indoors or outdoors also 24 Installing Inverter onto Wall 4 9 The ambient temperature should range from Meran ee 25 C to 60 C When ambient temperature 60 C exceeds 45 C the power output will reduce Min ambient temperature 10 The relative humidity of chosen installation site 25 C should never exceed 95 Moisture may result in 4 corrosion and damage the inner electronic components u 11 Do not expose the inverter to the direct sunlight Otherwise inverter will not operate normally Max relative humidity 95 No conde
30. is parameter 20 1 ELEN set param Password 3000 1 Firmware LCD SG1K5TLV21 V2 E M 64 1 Long press button ENTER gt to enter into sub screen ENTER to select icon a ENTER gt 2 Short press button Set param and long press button to confirm the selection 3 Short press ENTER gt to move cursor and short press ESC v to set the password 1111 ENTER gt to select icon ENTERA 4 Short press button Svs param and long press button to confirm the selection ENTER gt to select icon ENTERA 5 Short press button Firmware and long press button to confirm the selection 6 This screen displays software version of this inverter Operation of LCD Menu 8 8 8 6 Protective Parameters Settings a ENTER gt 1 Long press button to enter into sub screen 2 Short press button ENTER gt to select icon Set param and long press button Set param ENTER to confirm the selection ENTER gt c 3 Short press to move cursor and short press ESC v Password Bo00 1111 to set the password 4 Short press button ENTER gt to select ES icon Pro param and long press button Pro param ENTER gt to confirm the selection 5 Short press button ENTER gt to move Pro param Verid max OV cursor and short press ESC v to set Verid min
31. kaging It is the best choice to store the inverter by re using the original packaging JUNG OUI Hob Ge LTD SUNGROW POWER SUPPLY 496 94 676 Fig 4 1 Single Inverter in Wooden Crate unit mm 20 Installing Inverter onto Wall 4 4 2 Nameplate 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 Sungrow NGROW GRID CONNECTED INVERTER ype Serial No 110510349 Date of Manufacture 2011 05 17 C Power 1 5KW AC Voltage a c 230 V 50 60Hz 2 Current 8 PP DC Voltage Range CEE LE Voltage 450V ax DC Current 10A Ingress Protection IP65 AA Approval No SAA et Weight SUNGROW POWER SUPPLY LTD 4 WWW SUNGROWPOWER COM MADE IN CHINA Fig 4 2 Nameplate of Inverter SG1K5TL 31 Image shown here is indicative only Actual product you receive may differ SUNGROW logo and product type Technical data of inverter Marks of certification institutions of inverter Company name website and origin 21 SG1K5TL 31 user Manual 4 3 Delivery Contents Fig 4 3 Delivery Contents RS485 conn
32. ll electrical installations must be in accordance with local and national electrical codes Only after receiving prior approval from the utility company and qualified personnel installing the inverter should the inverter be connected to the utility grid All cables must be firmly attached undamaged properly insulated and adequately dimensioned These regulations should also be followed e The regulations related to the electricity fed into the grid e The safety instructions related to the PV arrays 30 Electrical Connection 5 5 2 Terminals Description All electrical terminals are located at the bottom of the unit as the following diagram shows Enough space should be kept for electrical connection at the bottom of the inverter when choosing the installation site D AC RS485 2061 OFFS on HTTP TT Fig 5 1 Terminals Description 5 9 Specifications of Cables All cables for PV power system are equipped with water proof direct plug in connectors You ll find these connectors in the package For electrical connection in PV power system specification of all cables used should meet following requirements And user should equip these appropriately sized cables Table 5 1 Specifications of Cables Min cross area Max cross area Recommended mm mm value mm _ e NO Mao pM qa CRM 31 SG1K5TL 31 user Manual 5 4 Overview of Electrical Connection Electrical connections of the
33. ng to markings on the connector especially PE cable If a phase wire is connected to the PE terminal it may permanently destroy the inverter Step 5 Pull cables outwards to confirm whether they are installed firmly Step 6 Combine the two front end parts together until there makes a clicking sound Step 7 Tighten the water proof terminal in opposite direction 38 Electrical Connection 5 5 6 3 AC Wiring Procedure N NOTICE Assignment of AC cables should be paid attention to especially PE wire Step 1 Assemble AC cables to connector supplied See 5 6 2 Assembling AC Cables to Connector Step 2 Make sure that the AC circuit breaker is disconnected and DC switch is rotated to the OFF position Step 3 Connect phase cables and N cable to AC circuit breaker Plug AC connector to corresponding AC terminals Screw AC cables except the PE cable to the AC circuit breaker Step 4 Connect AC circuit breaker to utility grid Step 5 Make sure that all AC cables are firmly installed 39 SG1K5TL 31 user Manual 5 Grounding of Inverter Because of the transformer less design of the inverter the DC positive pole and DC negative pole of the PV arrays are not permitted to be grounded Otherwise the inverter can not work All non current carrying exposed metal parts of the equipment and other enclosures in the PV power system should be grounded e g PV arrays and inverter For AC side it is b
34. nsing Meanwhile avoid exposing to rain or snow to extend its service life despite of IP65 protection degree Shaded site of the building will be better Expose to direct X X Expose to rain xpose to ite 12 Take enough space for convection into consideration during installing multiple inverters 25 SG1K5TL 31 user Manual 13 Do not install the inverter in a closed cabinet Otherwise the inverter will not operate normally Closed Cabinet 14 Do not install inverter where children can reach 15 Do not install inverter in living area Noise can be produced during running of inverter which may affect your daily life 4 6 Moving Inverter If the inverter is to be installed remove the unit from the packaging and move it to the chosen installation site During the moving process the instructions below should be obeyed 1 Remember the weight of inverter 2 Grasp the equipment with both hands by means of handles 3 Do not release the equipment unless it has been secured to the wall firmly 26 Installing Inverter onto Wall 4 4 7 Installation Procedure There is a backplate and fasteners supplied to install the inverter If you don t want to use the supplied backplate you can drill holes referring to its dimension below 1434 Fig 4 5 Dimensions of Fastener Set unit mm INSTALLATION PROCEDURE Step 1 Get
35. operties damage the following general safety instructions must be read and always kept in mind prior to any work All detailed work related safety warnings and notes will be specified at the critical points in corresponding chapter All installation and electrical work must only be performed by qualified personnel They have e been trained specially e already completely read through and understood the manual and other related documents e been familiar with safety requirements for electrical system Technical personnel mentioned above may perform the following work Install the inverter onto the wall e Connect inverter into the PV power system e Connect other devices into the PV power system e Commission the inverter e Maintain and service the inverter Safety Instructions 1 Before Installation There is a risk of injury due to improperly handling the device e Always follow the instructions contained in the manual when moving and positioning the inverter e The weight of the equipment can cause injuries serious wounds or bruising if it is not handled correctly During Installation Prior to installing the inverter onto the wall it is crucial to make certain that the inverter is not electrically connected System performance loss due to bad ventilation The equipment requires good quality ventilation during operation It is essential to keep the unit upright and nothing covering the heat sink in order
36. parameters See 8 8 6 Protective Parameters Settings And if local grid voltage exceeds the upper limit value of Vgrid max or if local grid voltage is under the lower limit value of Vgrid min please contact your local electricity company to adjust the grid voltage 5 Rotate the DC switch to the ON position 6 Close AC circuit breaker to restart the inverter 7 If the fault still exists please contact with Sungrow 1 Disconnect the AC circuit breaker 2 Rotate the DC switch to the OFF position 3 Check the frequency of grid side 4 If local grid condition exceeds AC demands of inverter reset the protective parameters See 8 8 6 Protective Parameters Settings And if local grid frequency exceeds the upper limit value of Fgrid max or if local grid frequency is under the lower limit value of Vgrid min please contact your local electricity company to adjust the grid frequency 5 Rotate the DC switch to the ON position 6 Close AC circuit breaker to restart the inverter 7 f the fault can not be solved please contact with Sungrow If this malfunction occurs the reasons are very complicated 1 Disconnect the AC circuit breaker 2 Rotate the DC switch to the OFF position 3 Check the inner temperature of the inverter and wait for cooling down 4 Rotate the DC switch to the ON position 5 Close AC circuit breaker to restart the inverter 6 If this malfunction happens again please contact with
37. s ee Uum 39 255 taromdipgaorinVeltel 40 Discorinecdomor IMVER ii Hm 41 59 Connecting CommuniCation Cable tii ep nee 42 5 9 1 Monitoring SYSICM a A A A a a g ata 42 9 9 2 GONNECUING RoOT95 Cable 43 G COMMISSIONING m 6 1 Verify before Commissioningeun ass ee u u 46 62 Commissionihd Procedurer anne ne a 46 7 1roubleshoolns di dns 7 7 1 Troubleshooting of LED ae as ne ta cud Ra ate bow ad 48 7 2 Troubleshooting of Faults in LCD Screen 2222240 220000000000nnnnnnennnnnnn nennen nennen nnn nnns nnns 49 OPERATION INFORMA a S Operation of LED I 8 1 Descriptiomor Button F UNGHOM ae a a ot ioo Ee ie e eod ee o4 8 2 Operation Mode of Inverter 0222000220000200000n0nnennnnnennnnnnnennnnenne nennen nnne nn arenas anser as 54 SPEI nee 55 SA GOMMaSt Adj stment aussen 56 6 0 Current Running Information ans T 56 8 0 10 All OF AO i a naan ee eet lane Gen M 58 sa HEP 59 8 8 Parameters ONMGUlA OM IE 60 So LanQuage SeltllidS i edes dM D Dd c rid a ea 60 8 8 2 Time SEemMmas a P 61 8 8 3 Deviation of Energy o aec a agde 62 882 bodd Default sd ot
38. sistance is connected between RS485 A and RS485 B of the first inverter Step 2 Connect RS485 A of Inverter 1 to RS485 A of inverter 2 Step 3 Connect RS485 B of Inverter 1 to RS485 B of inverter 2 Step 4 Connect other inverters in the same way Step 5 Connect RS485 cables of the last inverter to A1 and B1 port of Solarinfo logger Step 6 Connect RS232 port of Solarinfo logger to RS232 port of PC e PC Inverter 1 Inverter 2 Inverter n A A AANA A IS SSS oat A EN AAA EEE ent mn NL tata ENT Step 1 A 1200 resistance is connected between RS485 A and B of the first inverter Step 2 Connect RS485 A of Inverter 1 to RS485 A of inverter 2 Step 3 Connect RS485 B of Inverter 1 to RS485 B of inverter 2 Step 4 Connect other inverters in the same way Step 5 Connect RS485 A and B of the last inverter to RX and TX port of RS232 RS485 converter Step 6 Connect RS232 port of RS485 232 converter to RS232 port of PC 44 Commissioning About This Chapter This chapter demonstrates how to check before commissioning and operation procedures 45 SG1K5TL 31 user Manual 6 1 Verify before Commissioning 1 Verity whether inverter is fastened onto the wall See 4 Installing Inverter onto Wall whether all cables are undamaged See 5 3 Specifications of Cables properly insula
39. ted and adequately dimensioned Check whether all cables are firmly attached and See 5 5 Connecting Inverter to PV correctly Arrays to 5 9 Connecting Communication Cable 6 2 Commissioning Procedure Step 1 Make sure all items above meet demands Step 2 Close external AC circuit breaker Step 3 Rotate DC switch to the ON position Suppose that there is sufficient sunlight and no malfunctions PV arrays initialize and supply DC power to inverter Inverter verify whether grid conditions are OK Step 4 During the startup process LCD will enter into the below screen choose the appropriate language with the buttons and press ENTER HV Espanol lil Lcb sc1KstLv2i v2 E Step 5 Wait for a while and observe state of LED indicators and LCD main screen NOTE If inverter s commissioning fails FAULT indicator will be lit And state in the LCD screen will display type of malfunction In this case malfunction must be removed and then repeat step1 to step 4 If inverter s commissioning succeeds RUN indicator will be lit And state in the LCD screen will display RUN Step 6 Set time for the inverter according to your local time if successful commissioning See 8 8 2 Time Settings 46 Troubleshooting About This Chapter This chapter illustrates troubleshooting of LED indicator and malfunction displayed in LCD screen 47 SGIK5TL 31 User Manual 7 1 Trou
40. the inverter A NOTICE There is a risk of inverter damage Make sure that the maximum short current of each string does not exceed maximum input current Please refer to chapter Appendix NOTE PV string should have a homogenous structure including the same type the same number identical tilt and identical orientation 33 SG1K5TL 31 User Manual 5 5 2 Assembling DC Cable to Connector All DC cables are equipped with water proof direct plug in connectors which mate with DC terminals at the bottom of the inverter NOTE The positive and negative connectors are marked with polarity symbols and should be equipped with correctly colored cable Red cable represents DC positive connector and blue one represents negative Step 1 Unscrew the water proof terminal in the following direction Step 2 Strip off insulation layer of DC cable and crimp cable core with hand crimping pliers The length of strip insulation is approximate 8mm A A Step 3 Insert appropriately sized DC cable through water proof terminal p a p D di p p Step 4 Plug cable gland into connector housing until it makes a clicking sound Step 5 Tighten the water proof terminal in the opposite direction When connecting connectors they will be correctly locked in the mating place 34 Electrical Connection 5 5 5 3 DC Wiring Procedure Step 1 Assemble the DC cables to the corresponding connectors at the inverter sid
41. the inverter And they will be highlighted by these symbols DANGER DANGER indicates a hazard with a high level of risk which if not avoided will result in death or serious injury WARNING indicates a hazard with a medium level of risk which if not avoided could result in death or serious injury CAUTION indicates a hazard with a low level of risk which if not avoided could result in minor or moderate injury A NOTICE NOTICE indicates a situation which if not avoided could result in equipment or property damage NOTE NOTE indicates additional information emphasized contents or tips to help you solve problems or save time Contents SAFETY AND PRODUCT INFORMATION 0 eee ee eee ee eee eee e eon ooo o eee eese 1 I Satetv Instructions rS 2 Product IntroducliOEH uei teni oro a a 2 1 mended Usage sn Nr oc a a a A 10 2 2 Prinelple RETE T UU 11 2 9 Product DESCNDUON za a ne On eee 12 eA o 0 een TUO o Em 12 2 3 2 Dimensions and Weight 13 2 53 0 ECD DISplay PANG 13 2 34 SWIICH i T a eier 14 INSTALLATION AND MAINTENANCE INFORMATION e ee ee eeeeoeseessessesses LD 3 Installation oot UTERE REM uu e 4 Installing Inverter onto
42. the supplied backplate and fasteners from the packaging Step 2 Choose the best installation site according to above requirements Place the backplate onto the chosen wall and adjust it until it is in a horizontal position Step 3 Mark the positions to drill holes using the backplate as the template Step 4 Drill six holes at the marks you have made 2 SG1K5TL 31 user Manual 2 a ar 7 B 2 4 PE Ld Ss fcc 7 O io 2 2 ar t gt 7 5 Et L m 2 2 b L 1 DANGER In order to avoid electrical shock or other injury inspect existing electronic or plumbing installations before drilling holes Step 5 Fasten the backplate against the wall with the supplied fastener Step 6 Lift up the inverter above the backplate and then slide down to make sure that mounting ear on the back of the inverter fit perfectly together with the backplate 0 p 28 Electrical Connection About This Chapter This chapter proposes step by step procedures to perform electrical connection and related safety instructions 29 SG1K5TL 31 user Manual 5 1 General Safety Instruction Improper operation during the wiring process can cause fatal injury to the operator or unrecoverable inverter damage Only qualified personnel can perform the wiring work A
43. to select icon Set param and long press button D x ENTER gt 1 Start St op to confirm the selection ESG W 3 Short press to move cursor and long press ENTER gt to confirm the selection Start Stop 67 SG1K5TL 31 user Manual 68 APPENDIX Technical Data Technical Specifications SGIKSTL 31 DC Side Data Max DC Power 1600W Max Input Current 10A MPP Voltage Range 150 380V Max DC Voltage 450V Min DC Voltage 150V Start Voltage 170V AC Side Data Nominal AC Power 1500W Max AC Output Current 8A Rated Grid Voltage 230Vac AC Voltage Range 174 274Vac Rated Grid Frequency 50Hz 60Hz AC Frequency Range 47 52 5Hz 57 62 5Hz Output Current THD lt 3 at nominal power DC Current Injection lt 0 5 of rated inverter output current Power Factor 0 99 at nominal power oystem Max Efficiency 95 Euro Efficiency 94 69 Ingress Class IP65 Power Consumption at Night OW Operating Temperature 25 60 Cooling Method Natural cooling Relative Humidity 0 95 non condensing Max Working Altitude 2000m DC Switch Optional Technical Specifications SGIKSTL 31 Mechanical Data Dimensions W x H x D 318 460 151mm Weight Display and Communication Display LCD Communication Standard RS485 Communication Optional Ethernet Exclusion of Liability The content of these documents is periodically checked and revised when n
44. when handling the boards Do not touch the boards unnecessarily during replacement SG1K5TL 31 user Manual Others A NOTICE The selected country settings can be changed by service personnel only Unauthorized access to country settings should be prohibited Alternation of the country settings may cause a breach of the type certificate marking All safety instructions warning labels and nameplate on the inverter body e Must be clearly visible e Must not be removed covered and pasted These regulations should also be followed e The regulations related to the electricity fed into grid e safety instructions related to PV arrays e The safety instructions related to other electrical device Product Introduction About This Chapter This chapter introduces intended use main circuits and constituent parts of the inverter SG1K5TL 31 SG1K5TL 31 User Manual 2 1 Intended Usage SG1K5TL 31 is robust grid connected transformer less and of high conversion efficiency SG1K5TL 31 inverter converts DC power generated from the PV arrays into stable AC current and then directly feeds the AC power into the utility grid It is a crucial unit in the small scaled PV power system An example about intended usage of the inverter is shown in Fig 2 1 Where PV arrays need to be grounded of the positive or negative terminal SG1K5TL 31 inverter must not be connected in this kind of PV power system
45. xt it is called short press ESC v xs Press more than two Return to parent screen or cancel the command seconds In the following text it is called long press ESC v Press less than two Move cursor left or right in the screen In the following en text it is called short press ENTER gt ENTER gt Press more than two Enter into sub screen or confirm the command In the seconds following text it is called long press ENTER gt T 8 2 Operation Mode of Inverter e Stand by Stand by mode is entered for insufficient input power e Hun After being energized the inverter tracks the PV arrays maximum power point MPP and converts DC power to AC power e Fault If a fault occurs during operation the inverter will automatically stop operation trigger AC relay and display the fault type in the LCD panel with the Fault LED lit Once the fault is removed in 5 min inverter will automatically resume running e Stop The inverter will stop operation by manually stop through LCD menu this condition needs manual restart through LCD menu During the Stop mode the inverter will block the driving signals that control the switching PM and disconnect the inverter from the grid by switching off the AC relay Com fit There is communication malfunction The both two LED indicators will not be lit 54 8 Operation of LCD Menu 8 3 Overview of LCD Menu Contrast Adj
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