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INVT Photovoltaic Grid-connected Inverter, Operation Manual

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Three-phase photovoltaic grid-connected inverter                                                               

Installation

 

27 

4.4 Electrical connection 

This section presents the detailed contents and safety precautions related to electrical connection. 
Fig 4.13 is the connection diagram for PV grid-connected system. 

 

Fig 4.13 Connection diagram for PV grid-connected system 

 

  Electrical connection must be carried out by professional technicians as wrong 

operation may cause damage to the device, physical injuries or even death 

during system operation. 

  All the electrical installation must conform to the national and regulations 

concerning electrical safety regulations. 

  Ensure all the cables are installed firmly according to the specified safety 

requirements and free from any damage. 

  It is not allowed to close the AC and DC breakers before the inverter is 

electrically connected. 

Note 

  Read this section carefully and operate strictly according to the requirements. 

  Note the rated voltage and current value specified in the manual as they cannot 

be exceeded. 

4.4.1 Connection of photovoltaic string 

Plan 1: Use PG head 

Summary of Contents for Photovoltaic Grid-connected Inverter

Page 1: ...Operation Manual Photovoltaic Grid connected Inverter INVT Solar Technology Shenzhen Co Ltd ...

Page 2: ......

Page 3: ...tions seriously before any moving installation operation and maintenance to ensure correct use and high performance of operation on the inverter The use of the iMars series grid tied solar inverters must comply with local laws and regulations on grid tied power generation The manual needs to be kept well and be available at all times All rights reserved The contents in this document are subject to...

Page 4: ...Supported grid connection structure 10 2 2 Product appearance 11 2 3 Nameplate 13 2 4 Product model 14 2 5 Outline dimension and weight 15 3 Storage 16 4 Installation 17 4 1 Unpacking confirmation 18 4 2 Preparation before installation 19 4 2 1 Installation tool 19 4 2 2 Installation site 20 4 2 3 Specification of leads 22 4 2 4 Micro breaker 23 4 3 Mechanical installation 23 4 3 1 Installation of...

Page 5: ...2 6 1 LED state indicator 43 6 2 Operation keypad 45 6 3 LCD panel 45 6 4 Function operation 46 6 4 1 Monitoring parameter 46 6 4 2 Historical records 48 6 4 3 Statistic information 48 6 4 4 Parameter setup 48 6 4 5 System information 57 6 4 6 Present fault 57 6 4 7 Inverter control 57 6 4 8 Mode setup 59 6 5 Selection of grid certification standard 59 7 Monitoring communication 61 7 1 Standard co...

Page 6: ...ion and maintenance Incorrect use or misuse may result in Injury to the life and personal safety of the operator or other people Damage to the inverter or other property belonging to the operator or other people In order to avoid personal injury damage to the inverter or other devices please strictly observe the following safety precautions This chapter mainly describes various warning symbols in ...

Page 7: ...Note The procedures taken for ensuring proper operation Note Grounding The inverter must be reliably grounded Discharge Ensure that DC and AC side circuit breakers have been disconnected and wait at least 5 minutes before wiring and checking Note Technical personnel who can perform installation wiring commissioning maintenance troubleshooting and replacement of the iMars series grid tied solar inv...

Page 8: ...ectromagnetic interference caused by other electronic or electrical devices around the installation site Do not refit the inverter unless authorized All the electrical installation must conform to local and national electrical standards Do not touch the housing of the inverter or the radiator to avoid scald as they may become hot during operation Ground with proper technics before operation Do not...

Page 9: ...on The inverter input voltage cannot exceed the max input voltage otherwise the inverter may be damaged PV grid connected inverter is not applicable to the positive or negative ground system of solar battery component Ensure inverter PE is grounded properly otherwise the inverter cannot run normally Ensure the inverter is installed firmly and electrical wiring is reliable Note PV grid connected in...

Page 10: ...f the inverter are fully discharged The internal of the inverter are mostly electrostatic sensitive circuits and parts users must follow electrostatic protection protocols and take anti electrostatic measures Do not use components provided by other companies when repairing the inverter The inverter can be started again for grid connected power generation only after confirming there is no fault tha...

Page 11: ...ase photovoltaic grid connected inverter Product overview 9 2 Product overview This chapter mainly describes the appearance package accessories nameplate and technical parameters of the grid connected inverter ...

Page 12: ...ected power generation system The sunlight can be converted to DC energy through PV component then it is converted to the sine AC current which has the same frequency and phase position with the public grid via photovoltaic grid connected inverter and feedback such energy to the grid It is recommended that the PV array to be installed conforms to IEC 61730 class A standards 2 1 2 Supported grid co...

Page 13: ...taic grid connected inverter Product overview 11 Figure 2 2 Type of grid 2 2 Product appearance Fig 2 3 Appearance of 40 70kW three phase PV inverter Table 2 1 Instruction for key cosmetic parts of three phase PV inverter ...

Page 14: ... extension port EXT 5 AC terminal Inverter AC output port connect to public grid 6 Hanging slot The docking port between inverter master and installation bracket 7 Handle The force bearing point when moving the inverter 8 Safety precautions 9 Nameplate Indicate the rated inverter parameters 10 Anti theft screw hole Used to fix the inverter to the installation bracket 11 Fan installation component ...

Page 15: ...iew 13 2 3 Nameplate Figure 2 4 shows the inverter nameplate Figure 2 4 Inverter nameplate 1 Trademark and product type 2 Model and important technical parameters 3 Certification system of the inverter confirming 4 Serial number company name and country of origin ...

Page 16: ... Table 2 3 Models of three phase PV grid connected inverter Product name Model Rated output power W three phase L1 L2 L3 N PE three phase photovoltaic grid connected inverter 40kW 40kW three phase photovoltaic grid connected inverter 50kW 50kW three phase photovoltaic grid connected inverter 60kW 60kW three phase photovoltaic grid connected inverter 70kW 66kW three phase photovoltaic grid connecte...

Page 17: ...d net weight of the inverter Model Height mm Width mm Depth mm Net weight kg 40 70kW 810 645 235 52 70kW HV 810 645 235 52 50kW HV 660 645 255 55 W H D Fig 2 6 Dimension of paper package Table 2 5 Package dimension and gross weight Model Height mm Width mm Depth mm Weight kg Package material 40 70kW 990 810 420 62 K3K 70kW HV 990 810 420 62 K3K 50kW HV 835 815 410 60 K2K ...

Page 18: ...ept at 5 RH 95 RH The stacking of inverters is recommended to be placed according to the number of stacking layers in the original shipment Place the inverter carefully during stacking to avoid personal injury or equipment damage caused by the falling of equipment Keep away from chemically corrosive substances that may corrode the inverter Periodic inspections are required If damages are found by ...

Page 19: ...how to install the inverter and connect it to the grid tied solar system including the connection between solar modules public grid and inverter Read this chapter carefully and ensure all installation requirements are met before installation Only qualified electricians are allowed to install the inverter ...

Page 20: ...of the damage to get our fastest and best service Store the idled inverter in its original package and take anti moisture and anti dust measures After taking the inverter out of the box check the following items 1 Confirm the main body of the inverter is intact and free from any damage 2 Confirm there is operation manual interface accessories and installation accessories inside the package box 3 C...

Page 21: ...ration before installation 4 2 1 Installation tool Table 4 2 List of installation tool No Installation tool Purpose 1 Marker Indicate the installation hole 2 Electric drill Drill holes in the bracket or on the wall 3 Hammer Knock on the expansion bolt 4 Adjustable wrench Fix the installation bracket 5 Inner hex screwdriver Tighten the anti theft screw and disassemble AC junction box 6 Slotted or c...

Page 22: ...eight 2 The installation site must be well ventilated and away from raindrops or direct sunlight 3 There must be enough pre reserved space around the installation site for convenient disassemble of the inverter and air convection as shown in Fig 4 3 Fig 4 3 Installation spacing When install more than one inverter it is necessary to reserve a certain space between the inverters The left and right s...

Page 23: ...enerate strong electromagnetic interference 6 The inverter should be installed on firm and solid surface eg wall surface and metal bracket 7 The installation surface should be vertical to the horizontal line as shown in Figure 4 5 Install the inverter vertically or backward 15 to facilitate heat dissipation Do not tilt the inverter forward horizontal upside down over backward and roll when install...

Page 24: ...reserved for the grounding of the inverter Do not open the surface cover of the inverter or replace any part as incomplete inverter may cause electric shock and damage the device during operation 4 2 3 Specification of leads In order to regulate and compatible with the inverter AC DC connector or terminal block specifications below requirements on the AC DC leads connected to corresponding inverte...

Page 25: ...Table 4 4 Specification of micro breaker Inverter model DC side AC side Recommended breaker specification Recommended breaker specification 40kW DC1000V C100A 2P AC400V C80A 4P 50kW DC1000V C100A 2P AC400V C100A 4P 60kW DC1000V C150A 2P AC400V C150A 4P 70kW DC1000V C150A 2P AC400V C150A 4P 4 3 Mechanical installation The material for fixing the inverter and the installation mode vary with the diff...

Page 26: ...er installation bracket Inverter model Spacing of installation hole A mm B mm 40 70kW 430 330 70kW HV 430 330 50kW HV 400 400 The procedures for installing 3 phase PV inverter are listed below 1 Use the punch positioning plate in the packaging box to determine the punch position As shown in Figure 4 7 Level the holes with a level ruler and mark it with a marking pen Figure 4 7 Determine the punch ...

Page 27: ...re 4 8 Figure 4 8 Drilling 3 Fix the expansion bolts to the 4 6 installation holes with hammer as shown in Figure 4 9 Figure 4 9 Install expansion bolts 4 Fix the installation bracket onto the expansion bolts and ensure the installation is firm enough tightening torque is 13N m As shown in Figure 4 10 Figure 4 10 Fix the installation bracket ...

Page 28: ...ensure the installation is firm enough As shown in Figure 4 11 Figure 4 11 Installation of inverter 6 Ensure the inverter is installed properly and tighten the M5X20 bolts into the screw holes on the left and right side of inverter tightening torque is 3N m As shown in Figure 4 12 Figure4 12 Installation of M5X20 bolts ...

Page 29: ...device physical injuries or even death during system operation All the electrical installation must conform to the national and regulations concerning electrical safety regulations Ensure all the cables are installed firmly according to the specified safety requirements and free from any damage It is not allowed to close the AC and DC breakers before the inverter is electrically connected Note Rea...

Page 30: ...sure proper measures against lightening and short circuit have been taken three phase PV inverter can be connected only after protection measures which conform to local electrical regulations are taken and the technical parameters in this manual are fulfilled 2 Open the wiring bin of the inverter make the anode and cathode of the PV string whose terminals have been well crimped go through the wate...

Page 31: ...ur company otherwise damage to the device unstable operation or fire may occur and our company will not undertake quality assurance or assume any direct or joint liability thereof Plan 2 Use straightly inserted terminal Step 1 Connect the outlet of PV board to the terminal delivered along with the machine Figure 4 15 Connection of MC4 DC connector and PV string 1 Lighting short circuit and other p...

Page 32: ...voltage of each string is within the allowable range of the inverter as shown in Figure 4 16 Figure 4 16 DC input voltage measuring The PV string connected to iMars series inverter must adopt the DC connector configured especially for the inverter do not use other connection devices without authorization from our company otherwise damage to the device unstable operation or fire may occur and our c...

Page 33: ...he AC connector interface and ensure the conductor of the lead is unexposed and crimped firmly then connect the connection port of AC connector to the AC connection port of the inverter and ensure the leads of AC cable correspond to the connection ports of the connector and are tightened firmly Fig 4 18 three phase inverter 40 70kW grid connection 4 4 2 2 Parallel connection requirements of multip...

Page 34: ...voltage side to the medium voltage grid directly If total capacity of the inverter exceeds 1 6MVA contact our after sale service staff Meanwhile the transformer should fulfill total output requirement of the inverter and has neutral point or externally connected neutral conductor It is recommended to use the transformer whose short circuit impedance is no more than 7 ...

Page 35: ...connected inverter Running 33 5 Running This chapter mainly introduces operations related to to the usage of PV inverter which involves inspection before running grid connected running inverter stop and daily maintenance precautions ...

Page 36: ...nsure a safe normal and stable operation of the PV power generation system all the newly installed renovated and repaired PV grid connected power generation system and its grid connected inverter must undergo inspection before running 5 2 Inverter grid connected running Start the inverter according to below steps to achieve grid connected operation of the inverter Note It is a must to select the c...

Page 37: ...connected inverter is independent mode refer to section 6 4 4 to check and set DC input mode 5 3 Inverter stop When it is necessary to carry out power off maintenance inspection and fault elimination on the inverter stop the inverter according to the following steps 1 Disconnect the breaker on inverter public grid AC side 2 Disconnect the integrated DC switch of the inverter 3 Disconnect the circu...

Page 38: ...ear Clean the inverter Check the RH and dust around the inverter and clean the inverter when necessary Refer to section 5 4 2 Once per half a year Electrical connection Check whether system cable connection and inverter terminal block are loosened if yes secure them again in the manner specified in section 4 Check whether the cable is damaged and whether the cable skin touched by the metal surface...

Page 39: ...th soft brush or vacuum cleaner 4 Repeat the operations in section 5 1 5 Restart the inverter Clean the fan The cleaning steps are listed below 1 Disconnect the connection on input and output side 2 Wait for ten minutes 3 Disassemble the inverter in the same process with theinstallation procedures in section 4 but in reverse order 4 Remove the screws and covers of cooling bin or fan box as shown b...

Page 40: ...itors of the inverter are fully discharged The fan can be maintained and replaced by professional electricians only How to replace the fan 1 Disconnect AC breaker 2 Turn the DC switch to OFF position 3 Wait for at least 10 minutes 4 Disconnect all the electrical wirings at the bottom of the inverter 5 Lift up the inverter with the help of others and take the inverter off the wall 6 Place the inver...

Page 41: ...sconnect the input and output of inverter 2 Wait ten minutes 3 Clean the inverter surface and the air inlet and outlet with a soft brush or vacuum cleaner 4 Repeat the operation contents in section 5 4 5 Restart the inverter Fan cleaning The cleaning steps are as follows 1 Disconnect the input and output of inverter 2 Wait ten minutes 3 Disassemble the inverter in the reverse of the installation p...

Page 42: ...nly be carried out after the capacitor inside the inverter has been discharged Only professional electricians can perform fan maintenance and replacement work The fan replacement steps are as follows 1 Disconnect AC circuit breaker 2 Turn the DC switch to the OFF position 3 Wait at least 10 minutes 4 Disconnect all electrical connections from the bottom of the inverter 5 Lift the inverter with the...

Page 43: ... 5 4 12 Restart the inverter Note Once the inverter stops due to an alarm it is forbidden to start the machine immediately The cause should be identified and all faults must be eliminated before starting up Inspections should be carried out in strict accordance with the procedures in Section 5 4 ...

Page 44: ...tovoltaic grid connected inverter Display operation panel 42 6 Display operation panel This chapter mainly presents the usage of inverter display andoperation panel including LED state indicators and operation keypads ...

Page 45: ...on panel 6 1 LED state indicator There are three LED state indicators in the inverter display operation panel they are 1 Run running state indicator green light 2 Warn restorable fault alarm indicator yellow light 3 Fault non restorable fault alarm indicator red light The inverter states can be divided into sleep self inspection grid connected power generation restorable fault non restorable fault...

Page 46: ...on but clock is abnormal A007 2 Grid connected power generation is on but DC input is abnormal A001 or E001 3 Grid connected power generation is on but fan fault occurred E006 or E012 Green and yellow lights are ON other LED indicators are OFF Restorable fault state Run Warn Fault Inverter sleep state pubic grid abnormal A001 A003 A004 A005 or A006 Yellow light flickers at 0 5s interval other LED ...

Page 47: ...erter display operation panel supports graphics and backlight effect Under sleep or running state of the inverter if there is no button action in 15s LCD backlight will turn off automatically press any key on the operation manual can light up the LCD backlight again then press ENT key to enter the main menu interface of the inverter LCD as shown in fig 6 3 where users can view parameters and carry...

Page 48: ...splays alarm or fault the dynamic fault code area will display corresponding fault code display up to 8 fault codes 6 4 Function operation Users can view parameters and perform setup operations via the operation keypad and the LCD on the operation panel Main menu Monitoring parameter Previous record Statistic information Parameter setup System information Current fault Fig 6 3 Main menu interface ...

Page 49: ...id voltage V Grid voltage W Grid current U Grid current V Grid current W Grid frequency Power factor Input V V1 Input I I1 Input V2 Input I2 Grounding resistance Leakage current Temperature 1 Temperature 2 Total power Total time Current date Current time Up time of initial power on Initial working time Time when today s peak power occurred Time when today s power generation ends Time when yesterda...

Page 50: ...stored and the 3 rd row displays detailed information of fault code When the 3 rd row displays in inverse color it indicates fault occurred otherwise it is fault restored 6 4 3 Statistic information Press or key in the main menu to select statistic information then press ENT key to enter statistic menu as shown in fig 6 6 Statistic menu Lifelong information Today s statistics Fig 6 6 Statistic inf...

Page 51: ...ted inverter Display operation panel 49 S e t u p m e n u Set address Set password Set currency Set time Set language Set mode Fig 6 7 Statistic information Setup menu can realize parameter setup shown in table 6 4 A view of All LCD menus ...

Page 52: ...05 AC underfrequency 2 A001 Input undervoltage 3 1 InputV 1 0 0 V Input I 1 0 0 A InputV 2 0 0 V 02 A 001 Menu Alarm p h Grid tied parameter Product model ON OFF Setup menu Set address Set password Set currency Set time Set language Set country Set RS485 address 0011 User password 0000 Set currency unit price Currency Unit price 0 08 A kWh AUD Set date time Date 2014 10 27 Time 12 14 30 Set mode I...

Page 53: ...re to default setup Press ENT key to confirm Press ESC key to cancel Grid tied parameter Grid connected parameter Under voltage protection Undervoltage time Overvoltage protection Undervoltage time Under frequency protection Under frequency time AC undervoltage protection time 200ms Table 5 4 Inverter parameter setup Item LCD display Instruction Set address Set RS485 address 0 0 1 Set RS485 addres...

Page 54: ...currency Set the unit price of the currency Currency EUR Unit price 00 50 1kWh Set the unit price of the currency Currency EUR Unit price 00 50 1kWh E U R Press ENT key under set currency unit price interface to edit the currency and grid connected electricity price The currency includes EUR POD CNY and USD When the cursor flickers at currency row press or key can switch the currency press ENT aga...

Page 55: ...ave the setup Press ESC key to return Set mode Set mode Independent Independent Parallel connection DC input mode is divided into independent and parallel independent is to carry out independent max power tracking on Track A and Track B PV string Parallel mode is to carry out synchronous max power tracking on Track A and Track B PV string The default DC input mode of 3 phase PV grid connected inve...

Page 56: ...e phase machine manual mode set the output power amplitude manually Power amplitude this function is effective only when power limit mode is manual the percentage ratio is that of the rated power the setting range is 10 100 Power factor Divided into common mode default is 1 current lead and current lag mode setting range is 0 9 0 99 3 phase machine currently carries Power factor function only Indi...

Page 57: ...ndervoltage time 0 20s 263V 0 20s Under frequency protection 47 6Hz Under frequency time 0 20s Over frequency protection 51 4Hz Over frequency time 0 20s Input password 0000 Overvoltage protection phase voltage Overvoltage time When entering individualized setup interface password authorization is required this can be acquired from the supplier When entering corresponding sub menus users can set t...

Page 58: ... time AC under frequency protection point phase voltage AC undervoltage protection point time AC undervoltage protection point phase voltage AC overvoltage protection point time AC under frequency protection point AC under frequency protection point time AC over frequency protection point AC over frequency protection point time Grid connected restart time There are two protection points under G83 ...

Page 59: ...g 6 9 System version Version1 V1 05 Version 2 V1 05 MCU software version V1 05 Fig 6 9 System version 6 4 6 Present fault Select present fault in the main menu via or key then press ENT key to enter fault information sub menu as shown in fig 6 10 Fault information 1 A005 AC under frequency 2 A001 Input under voltage 3 1 Fig 6 10 Fault information User can press or key in the fault information inte...

Page 60: ...and the historical records of operation Press ENT key in reset restart key to restart the inverter and return the inverter starts self inspection press ESC key to quit and return Clear information Clear all records confirm Press ENT key to confirm Press ESC key to cancel Press ENT key in clear all records interface to clear all records press ESC key to cancel and return Clear information is to cle...

Page 61: ...6 4 4 for the way to set the input mode Fig 6 12 Parallel input mode 6 5 Selection of grid certification standard After power up the inverter or restore to default setup for the first time LCD will display a country list for users to select the country as shown below Country Unset Germany UK Australia Greece Denmark Holland Country Unset Other Denmark Holland China Thailand Greece Press or key to ...

Page 62: ...ain menu Monitoring parameter Historical record Statistic information Parameter setup System information Current fault Set menu Set address Set password Set currency Set time Set language Set country Current country China Britain Austrilia Greece Germany Denmark Holland Users can check the grid standard by the following means LCD Menu Main menu System information System information Certification a...

Page 63: ...taic grid connected inverter Monitoring communication 61 7 Monitoring communication This chapter mainly introduces the communication connection of inverter and monitoring system eg industrial control master PC smart phone ...

Page 64: ...interfaces which are RS485 and EXT These two communication interfaces can be used in the communication with PC and smart phone to achieve monitoring of the inverter The monitoring system solution is shown in fig 7 1 Fig 7 1 Inverter monitoring system Table 7 1 Instruction for communication connector interfaces Pin of inverter communication connector Pin definition 1 Red 5VDC 2 Orange A RS485 3 Bro...

Page 65: ...oing wire of the communication connector to the user device correctly Fig 7 4 Connect communication cable to the inverter 3 Please download the monitoring software iMars WinExpert and its operation instruction 7 2 Optional communication The optional communication modes supported by PV grid connected inverter are Ethernet Wifi and GPRS The optional communication modes must adopt the accessories sho...

Page 66: ...pper computer interface Ethernet converter RS485 EXT RJ45 plug WiFi converter RS485 EXT Wireless WiFi signal GPRS module RS485 EXT Visit www invt solar com to obtain the connection mode of communication accessories and inverter user manual and the debugging tools Note Communication accessories are not standard configuration and should be purchased separately ...

Page 67: ...Three phase photovoltaic grid connected inverter Fault isolation 65 8 Fault isolation This chapter mainly describes fault alarms and fault codes for figuring out the inverter fault quickly ...

Page 68: ...od E E001 Input OV Input overvoltage DC input overvoltage E003 Bus OV Bus overvoltage Inverter internal bus overvoltage E004 Boost Fail Boost fault Inverter boost circuit fault E005 Grid OC AC overcurrent Inverter internal AC output overcurrent E006 OTP Overheat Inverter internal temperature is too high E007 Riso Low Insulation impedance is too low The system insulation impedance of inverter exter...

Page 69: ...large large E015 OutputShort Output short circuit AC output short circuit fault E018 Input OC Input overcurrent DC input overcurrent E019 Incnst Data consistency fault Master slave controller grid voltage frequency current leakage or the sampling of AC DC component is inconsistent E020 PowerReversed DC power reversal DC power reversal ...

Page 70: ...inverter Fault isolation 68 If any problem please contact with the supplier and provide following information Model of the inverter Serial No of the inverter System version version 1 version 2 MCU software version Fault code Fault description ...

Page 71: ...tact us China Shenzhen INVT Solar Technology Shenzhen Co Ltd Address 7 Building Gaofa Industrial Park Longjing Nanshan district Shenzhen Service hotline 86 400 700 999 E mail solar service invt com cn INVT group website www invt com INVT solar website www invt solar com ...

Page 72: ... 3 at rated power System Cooling mode Air cooling Max efficiency 98 60 Euro efficiency 98 20 MPPT efficiency 99 90 Protection level IP65 Power consumption at nighttime 1W Protective class I Overvoltage category AC III PV II inverter topology Non isolated Pollution degree 3 Ambient temperature 25 60 auto derating is required if the ambient temperature exceeds 45 C RH 4 100 condensation Max altitude...

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