Troubleshooting for 10-20kUE Three-Phase Inverter
Contents
1. Set ID drop down list and click Operate button to read the AC voltage limits in Set value field one by one amp ShineHus 4 Parameter 2 Read CMD 3 Grid CMD 4 Parameter 5 Auto Test 6 FW Update 7 Product Sett 17 Re Vac Low l2 Connect Fac High a El Vac Low 14 R1 Vac High igh 19 R2 Fac Low 20 E2 Fac High 21 ac 10min Avg 22 El Vac Low Time 23 KI Vac High Time GA 24 R1 Fac Ge Time Period ms Operate FR RI Bae Hinh Tima 17 powerin g tomorrea rowatt Fig 4 5 9 8 Check whether the limits are complied with local grid standard If not please reset the limits by ShineBus Fill corresponding value in Set value field not selected Read option and click the Operate button to set AC voltage limits one by one Example as follow figure related values refer to Table 4 5 1 Ka Shinebus 4 Parameter 1 Device Info 2 Read CMD 3 Grid CMD 4 Parameter 5 Auto Test 6 FW Updai4 13 R1 Vac Low P 184 0 Add Zz Period ms 495 operate Fig 4 5 10 Netherlands Swiss France VDE 0126 N4105 1860 G83 2 200 0 G59 2 200 0 CEI 0 21 195 5 Table 4 5 1 9 If all conditions are OK and this fault still exists please contact Growatt service amp ACF Outrange Grid frequency is out of range Or the inverter s frequency limits is incorrect gt If there are several inverters in parallel and the inverter shows AC V Outrange after the2. Fig 5 2 6 ShineBus set Model and serial number gt The inverter s model name is made up of PFU1MxSx four sections the last two sections should be preset in accordance with the power level and country or grid standards The meaning of Mx and Sx are shown in Table 5 2 1 5 2 2 25 ering tamaorro w rowalt Growatt 20000UE e Table 5 2 1 Mx stands for the power level of the inverter 2 VOEO netherland 2 1 Barbados gt a Aerem a RECH e spantrbuss 6 e ae we ean a we 8 emsode benmark Con gt mas ee mem a emw Table 5 2 2 Sx stands for the adopted standards or countries gt The serial number can be found in the label attached to the side of the inverter as Fig 5 2 7 5 2 8 Fig 5 2 7 Label and S N location 26 powering tomorrow rowatt pa ShineCorrection 1 0 26 Energy AC Total 20219 6 COMI iv Set State OK is successful for setting COM port address in PC Found in Device Manager Auto Inv Add can be Inv Add Internal address of inverter selected if only one inverter Registered total energy Value E all e g 20000 0 _a connected Table 5 2 3 Meanings of E_all reset interface in ShineCorrection 11 Reset total energy E_all via ShineCorrection referring to Fig 5 2 9 and Table 5 2 3 12 Turn on AC breaker and restart the inverter 27 ow ef i CONTACT INFORMATION If you have any questions about our product our hotline will be h
3. board over 5 seconds 12 Bus voltage is too high un Model error ug GFCI module check fails Fault System Fault Auto Test Failed Auto test didn t pass PV Isolation Low 125 PV input insulation impedance too low PV Voltage High 128 2 PV voltage is over 1000V Residual High 126 Leakage current too high Output High DCI ES 2 Output DC current too high AC V Outrange 129 Grid voltage is out of range AC F Outrange 130 Grid frequency is out of range Table 1 1 1 Fault and warning summary 100 103 104 105 101 107 117 121 122 104 119 125 128 126 127 129 130 owering tamerres rowalt TROUBLESHOOTING Warning amp Warning 100 Malfunction with the fan 1 Turn off DC switch rotate the fan blade with screwdriver and then restart the inverter Ce Fig 2 1 1 2 If itis not easy to rotate the fan blade check whether the fan is stuck by some obstructions A If fans or grills are just covered by soft dust particles stones or snow lump using tools such as vacuum cleaner to clean the fans And if user has no such tools or there are obstructions in fans grills or the cooling area of inverter you need to clean the fans and grills after they are took apart from the inverter Note a Growatt 10 20kUE three phase inverter has two types of fan structures b Growatt 10kUE 12kUE has two fans while 18KUE 2O0KUE has three fans on the top of inverter Fan type 1 cleaning procedure The left and top of shel
4. clothes or water Fig 2 1 7 9 After cleaning assemble the inverter in reverse order If you cleaning the fans with water make sure the fans cables and connectors are dry before assembling Fan type 2 cleaning procedure There is only independent fan cover on the top of inverter 1 Please disconnect the DC and AC connection gt Turn off the DC switch gt Disconnect the DC terminal You might need some tool to disconnect the male and powerin g tomorrea rowatt female terminals gt Disconnect the AC terminal 2 Remove the inverter from mounting bracket and place inverter horizontally on clean and dry place 3 Screw off the screws to open the fans cover with suitable tool then fans will be seen as Fig 2 1 8 Fig 2 1 8 4 Pull out the plug connectors with some tinny tools as Fig 2 1 9 Fig 2 1 9 Fig 2 1 10 Powering tamerres 6 After finishing cleaning assemble back the fans in reverse order B If the fan is not stuck check whether the fan is broken especially motor bracket of fan is broken or not Motor Bracket Fig 2 1 11 Cooling fan Fan replacement is required if it fails to work The procedure is similar to fan cleaning procedure the difference is that broken fan should be exchanging before assembling the inverter in reverse order Please contact Growatt service to get new one if there are some broken fans in inverter amp Warning 103 Fail to read EEP
5. immediately and wait until the fault is cleared When a warning message is shown on LCD display the inverter will continue working but will be accompanied by flash red LED indicator You may be advised to contact Growatt in some situation please provide the following information Information concerning the inverter VVVV VV WV v WV Serial number Model number Error or warning message on LCD Short description of the problem Grid voltage DC input voltage Can you reproduce the failure If yes how Has this problem occurred in the past What was the ambient condition when the problem occurred Information concerning the PV panels VVVVV VV WV Manufacturer name and model number of the PV panel Output power of the panel Voc of the panel Vmp of the panel Imp of the panel Number of panels in each string How many strings connected in one MPP tracker If it is necessary to replace the unit please ship it in the original box powerilin g tomorre rowatt Warning e g LCD Shows Warning 100 um maliuncionwithineen os fentora 104 Firmware version unmatched e Lienen Error Inverter Fault e g LCD shows Error 101 Communication error COM board Slave CPU doesn t receive from control board Main CPU over 10 seconds um Sampling difference is big 17 Relay fault Relay check fails 6 times Communication error control board doesn t receive data from COM communication
6. tay ad ae A i a gt S Fig 4 5 5 6 Turn on DC switch compare the measured grid voltage with the AC voltage displayed on LCD If the tolerance is more than 3V please calibrate AC voltage of the inverter as following steps Fig 4 5 6 Output information interface 1 Connect your PC with inverter via RS232toUSB cable And then start the inverter 2 Run software ShineCorrection Select 10 V AC R in Item List dropdown list enter your COM port and inverter address if the inverter can t be connected with other inverter via RS485 you can select the option Auto Inv Add 3 Enter the measured value into Value frame 4 Input setting password Correction click Set button to finish R phase AC voltage calibration 16 powering tomorrow rowatt ZP ShineCorrection 1 0 E fx 230 0 Set 10 V ACR R phase AC voltage 230 0 14V ACS S phase AC voltage 230 0 18 V ACT T phase AC voltage 230 0 Table 4 5 1 5 Select 14 V AC S or 18 V ACT in Item List dropdown list and repeat above processes to finish S phase or T phase AC voltage calibration 7 Check the AC voltage limits via ShineBus as following steps 1 Choose 4 Parameter menu select Read option as following figure ShineBus 4 Parameter 2 EN 2 Read CID 3 Grid CMD 5 Auto Test 6 FW Update 7 Product Seit gt 15 R1 Vac Low Operate Fig 4 5 8 2 Select 13 14 17 and 18 option in
7. Growat Troubleshooting for 10 Z0kUE Three Phase Inverter ee Growat Content GENER AL NNN 1 TROEENOONING ws ws cscs O E E E A 3 i Vd CH Te 3 OVNEN 3 VNN1I0S oasis wc sie esc ec sis secs tec red ae ec tate cee sede sec atceeed anda cataeecnc aed ecatedeeeedietewecaiees 7 WARNING 104 D 7 WARNING 105 EEN 9 ll INVERTER FAULT oerrescsernn raian E EE 9 ERROR lr DEE 9 FRONT he 9 Ge FEFRROR II EE 9 ERRORE BEEN 10 EPROR Kn e EEN 10 EPR R TUR EE EEN 10 ERROR LIS NN 10 M Sro TEM OL gee ee ee E a eee ane MM 10 MT Sy d WE 10 PV ISOLATION Ee EEN 10 PV VOLTAGE HIGH EE 12 e REDUT HOR EE 13 SE e Ehe PUT IG pe EE 13 ACVOUTRANGE he 14 e ACFOUTRANGE EE 18 ANNEX NNN 20 1 HOWTO CONNECT AC TERMINAL DISCONNECT IN REVERSE ORDER errorrrrrrrronrrrrrrnnnrrrrrrnnnrrrnrrnnnernnrrnnnernnnrnnnernnnrnuneeeee 20 2 HOWTO REPLACE CONTROL BOARD AND COM BOoapn 23 CONTACT INFORMATION sciscoccsssansssccssannscescastaneseqsaannneeesasnnsassseunneniiseceasaannnsewaddanaapeseananiassonnnsiiensecdiananecsuneaveessedenanines 28 p owerin g t rowatt GENERAL This document is applicable for Growatt 10000UE 12000UE 18000UE and 20000UE three phase inverter An error message will be displayed on the LCD screen while a fault occurs The faults consist of inverter fault and system fault All faults will shut down the inverter accompanied by red LED indicator
8. If the warning still exists please refer Annex 2 to replace COM board and control board Inverter Fault amp Error 101 Communication error COM board doesn t receive data from control board over 10 seconds Please power off the inverter completely till there is nothing displayed on LCD and restart observe whether the warning is cleaned If the warning is not cleared please power off inverter and open the inverter cover to confirm the signal cable between control board and COM board shown in Fig 3 1 1 is connected well E i p mE y i A Control board COM board Fig 3 1 1 Signal cable between COM and control board If the error still exists please refer Annex 2 to replace control board and COM board amp Error 107 Sampling difference is big Restart the inverter check if the error still exists If the error still exists please refer Annex 2 to replace control board and COM board If the error still exists please contact Growatt service to replace an inverter amp Error 117 powerin g t rowatt Relay fault There is something wrong with the relay or its relevant circuit Restart the inverter if the error still exists please contact Growatt service to replace the inverter Error 121 Communication error control board doesn t receive data from COM board over 5 seconds Please power off the inverter completely till there is nothing displayed on LCD and restart observe whether the wa
9. O 0 0 0 0 000007 d SR D Oo ox ET Fig 5 1 3 B AC connector 2 Assembly procedure 1 Unscrew the AC connector by hand and slotted screwdriver into four components as Fig 5 1 4 Fig 5 1 4 2 Connect 5 cables into their respective channels on the AC terminal shown as Fig 5 1 5 for the mark beside every socket N represents Neutral 1 2 3 represent 3 live channels and F is ground tighten all screws 1 0Nm 9 Ibf in max Fig 5 1 6 3 Insert the contact into the body with slotted screwdriver 1 13Nm 10 Ibf in to 1 36Nm 12 Ibf in screw up other components of the connector as Fig 5 1 6 5 1 7 21 powerin g tomorre Va ei A d sc J TLE Se 0 00 pe Fig 5 1 7 Fig 5 1 8 4 Connect it to the inverter as Fig 5 1 8 C ACconnector 3 Assembly procedure 1 The AC side terminals of the inverter are like Fig 5 1 9 it is clear to confirm that L1 L2 L3 represents three live line output N represents neutral line and is grounding line 2 Connect five standard cables into relevant terminals The five cables should be put through the protection shell as Fig 5 1 10 Fig 5 1 9 Fig 5 1 10 3 Fasten the protection shell onto the bottom of the inverter make sure the four screws are tightened the completed appearance is like Fig 5 1 11 22 powering tomorrow rowatt Fig 5 1 11 2 How to replace control board and COM board Replacing procedure 1 Be
10. ROM Please power off the inverter completely till there is nothing displayed on LCD and restart observe whether the warning is cleared If the warning is not cleared please refer step 9 in Annex 2 to reset the model value and serial number S N and then restart the inverter for retry If the warning still exists please refer Annex 2 to replace COM board and control board Warning 104 Firmware version unmatched Please register model name indicated on the data label beside inverter powering tomorrow rowatt GROWATT FV Grid Inverter a i IL i n S i 3 TET Til HARE i VDE AR NA105 CEI 0 21 CE RD 1669 VDE 0126 1 1 G59 IEC 62109 Fig 2 3 1 Data label 2 Please read the internal firmware version and model value by knock or via ShineBus and register them as well l Device Info Read CMD 3 Grid CHD 4 Parameter 5 to Test 6 FW Updai4 No OO iodel GTGF BB Fig 2 3 3 Internal FW Ver on LCD d Shinebus 1 Device Info File Language Laylut Iny Add 0 Period ms Fig 2 3 4 State information on ShineBus 3 Provide above information to Growatt service Rioonerenocoonencoicncencdzonornoncnanoss Model value Firmware version powerin g tomorrea rowatt amp Warning 105 Fail to write EEPROM Please power off the inverter completely till there is nothing displayed on LCD and restart observe whether the warning is cleared
11. SE FI Gas Uiek Tima Fig 4 6 3 3 Check whether the limits are complied with local grid standards If not please reset the limits by ShineBus Fill Corresponding values in Set value field not selected option Read and click button Operate to set AC frequency limits one by one Example as Fig 4 6 4 related values refer to Table 4 6 1 Operate amp ShineBbus d Parameter File Language Layllut 1 Device Info 2 Read CMD 3 Grid CMD 4 Parameter 5 Auto Test 6 FW Updai4 15 Kl Fac Low 47 5 Period ms _ Operate 19 UK Table 4 6 1 4 If all conditions are OK and this fault still exists please contact Growatt service ANNEX 1 How to connect AC terminal Disconnect in reverse order Note There are three types of AC connector for Growatt UE series inverters Please follow the instructions corresponding to the parts we offer you A AC connector 1 Assembly procedure 1 Connect the cables into their respective channels shown as Fig 5 1 1 T represents Neutral channel marked with 1 on the terminal 2 3 4 on Fig5 1 1 represent three Live line channels marked with 2 3 4 on the terminal and GND represents Ground channel marked with on the terminal A A K I ORO LA GY ST Si lt Fig 5 1 1 Ea Fig 5 1 2 3 Connect it to the AC side of the inverter as Fig 5 13 20 powerin g taomorre a y WO
12. appy to assisit you please contact Growatt service with information below GROWATT NEW ENERGY TECHNOLOGY CO LTD Email service ginverter com Building A Jiayu Industrial Zone 28 Guangming Road Address Longteng Community Shiyan Baoan District Shenzhen P R China 86 755 2747 1942 86 755 2747 1460 28
13. er make sure the inverter totally shut down 2 Open the inverter cover by suitable screwdriver 3 Refer to Annex 2 to remove control board and COM board 4 Screw off 4 screws on metal panel as Fig 4 5 1 and remove metal panel we O p q H j o Mero ut 3 i re i 9 CH w i F Fig 4 5 1 5 Make sure all the points as Fig 4 5 2 or Fig 4 5 3 marked are tightened 14 powerin g tomorrea Inside AC terminal Fig 4 5 3 6 Assemble the inverter in reverse order 4 Turn on AC breaker measure the real grid voltage L1 L2 L3 to N by multi meter 5 Check whether the grid voltage is complied with the local grid standards check whether the grid voltage is stable with multi meter If both not please contact the local electricity company Note There are two ways to measure phase voltage of grid gt If the AC terminal belongs to type 1 or type 2 as Fig 4 3 1 show please measure the corresponding phase voltage R S T 3 phase inside inverter as Fig 4 5 4 CAUTION Electric shock You must confirm that control board COM board metal panel and reserved screws are all placed outside the inverter before switch on the AC breaker 15 o mort Oo power rowatt Fig 4 5 4 gt If the AC terminal belongs to type 3 as Fig 4 3 1 show please remove the shell of AC terminal by screwdriver and measure the corresponding phase voltage R S T 3 phase outside inverter as Fig 4 5 5 N tt 2
14. fore replacement please register some important information such as total energy E allthe inverter has already generated to grid Fig 5 2 1 E all information on LCD 2 Disconnect DC breaker and AC breaker to power off the inverter 3 Remove the cover of RS232 interface with a cross screwdriver Fig 5 2 2 RS232 interface 4 Unscrew the two nuts on RS232 port using a 5mm sleeve screwdriver 23 powering taomorrea rowalt Fig 5 2 3 Two nuts on RS232 port 5 Remove the front cover and disconnect the connectors shown as Fig 5 2 4 it ET Note If here has a white connector disconnect it too K Fig 5 2 4 Connectors on control board and COM board 6 Unscrew the eight screws connecting the control board and COM board with the metal panel 24 ering tamorro w rowalt Fig 5 2 5 Screws on control board and COM board 7 Replace the COM board control board with new one and screw it back by using the four SCrews 8 Reconnect all the connectors on the board 9 Assemble remain parts in reverse order of the disassemble procedure 10 Turn on the DC breaker and reset the inverter s Model and serial number via ShineBus Remember to click the Set button to save the modification Ki ShineBbus T Product Set A E File Language Laylut 3 Grid CMD 4 Parameter 5 Auto Test 6 FW Update T Product Set IK PFU 1 Mhz Sx 12354567890 Iny Add l Period ms 495 Sel cae Ak
15. inverter feed to grid working for a while perhaps the grid impedance is too high please record the AC wiring condition including length and diameter of cables etc and record whether assemble an isolated transformer on the output and then contact Growatt service Meanwhile you can check as following steps 1 Check whether the frequency on the LCD as Fig 4 6 1 and measured grid frequency by multi meter are both within the local grid standards if not please contact local electricity company 18 powering tomorrow rowatt Fig 4 6 1 Power information interface 2 Check the grid frequency limits by ShineBus as following steps 1 Select layout 4 Parameter select option Read as following figure bd ShineHus 4 Parameter 2 Read CHD 3 Grid CMD d Parameter 5 Auto Test 6 FW Update T Product Sei 4 ll l 1 Operate Fig 4 6 2 2 Select 15 16 19 and 20 option in Set ID drop down list And click button Operate to read the frequency limits one by one Z ShineBus 4 Parameter E E File Language Layllut 2 Read CMD 3 Grid CMD 4 Parameter 5 Auto Test FW Update T Product Set 4 15 Kl Fac Low 12 Cormect Fac High a 13 R1 Vac Low EK F ac High 15 R1 Fac Low 16 R1 Fac High i RI VM i ac Low 18 Re Vac High 19 R2 Fac Low 20 RY Fac High Vac IUmin Ave 22 Kl Vac Low Time 23 El Vac High Time e EEN Zi 120 EI Fac Low Time
16. l plane is as entirety seamlessly 1 Before cleaning please disconnect the DC and AC connection gt Turn off the DC switch gt Disconnect the DC terminal You might need some tool to disconnect the male and female terminals gt Disconnect the AC terminal 2 Remove the protection pedestals at the bottom of inverter Remove the inverter from mounting bracket and place inverter horizontally on clean and dry place First of all you should remove the protection pedestals at the bottom of inverter as Fig 2 13 show Use screwdrivers counterclockwise rotate the screws as figures shown below o mort Oo power rowatt wi p pf D mt mim Fig 2 1 3 A View Fig 2 1 4 B View 3 Remove the handles on both sides of UE inverter as Fig 2 1 4 show 4 Remove the shell plane of the bottom and right side Use appropriate screwdrivers counterclockwise rotate the screws marked in Fig 2 1 5 Fig 2 1 5 5 Unlock and remove the plug connectors of cooling fans To unlock the plug connectors you need some tinny tools There are 2 connectors as Fig 2 1 6 show powerin g tomorrea Fig 2 1 6 6 Remove the shell plane of the top and left side as Fig 2 1 6 1 2 45 show It s easy to clean the grills on shell plane using water or some tools 7 Clean the grills on shell planes 8 Remove and clean the cooling fans Unscrew and remove the cooling fans as Fig 2 1 7 Clean the cooling fans using appropriate tools such as brushes
17. owatt service 10 ering tamaorro w rowalt 3 Check if the PV modules are well grounded Fig 4 1 1 Earth connection 5 Open the inverter cover to check if the inside grounding cable is well connected Fig 4 1 2 Inside earth connection 6 Check if the marked screw is loose or not If loose please tighten it Fig 4 1 3 Earth connected screws 7 Disconnect PV terminals and measure the impedance between PV1 and Earth PV2 and Earth PV and Earth by multi meter check whether all the impedances are beyond 1 Mega ohm if not please contact Growatt service Note Inverter shell is also grounded 11 powerin g tomorrea Earth e E Ze dt w n W i Lee RK KK ie WT ke MN 1 o j ll IW VA a d KL ar Th te d A gt e amp i g Ar Fig 4 1 4 DC side in the inverter PV1 PV2 PV2 PV1 amp PV Voltage High PV voltage is over 1000V Turn off AC breaker measure the string voltage between PV to PV by multi meter according to the mark on DC terminal shown as Fig 4 2 1 and check whether it is within DC voltage range If it is higher than the Max allowed DC voltage 1000V you need to reduce the quantity of PV modules MPP Tracker A MPP Tracker B Fig 4 2 1 If actual PV voltage is not closed or over 1000V please turn off AC breaker compare the measured value with the PV voltage displayed on LCD If the tolerance is more than 3V please calibrate PV
18. restart the inverter and check whether the fault still exists or not If the fault doesn t always appear please don t care because the inverter will automatically recover and continue working If the error always appears please update the firmware of control board to version 0D36 or above and COM board to version 0C29 or above If the error still exits after updating please contact Growatt service to replace an inverter 13 powering tamorro rowatt amp ACV Outrange Grid voltage is out of range Or the inverter s voltage limits is incorrect gt If there are several inverters in parallel and the inverter shows AC V Outrange after the inverter feed to grid working for a while perhaps the grid impedance is too high please record the AC wiring condition including length and diameter of cables etc and record whether assemble an isolated transformer on the output and then contact Growatt service Meanwhile you can check as following steps Note In this document L1 L2 L3 means three phase live wire and N means neutral wire 1 Check whether AC circuit breaker is off 2 Measure the L 123 to N voltage to check whether public grid is cut off 3 Turn off AC breaker and DC switch check whether AC cables are all firmly and correctly connected A For checking the AC terminal outside inverter please refer to Annex 1 B For checking the AC terminal inside inverter please check as following steps 1 Disconnect DC and AC break
19. rning is cleared If the warning is not cleared please power off inverter and open the inverter cover to confirm the signal cable between control board and COM board shown in Fig 3 1 1 is connected well If the error still exists please refer Annex 2 to replace control board and COM board Error 122 Bus voltage is too high Restart the inverter and check whether the error still exists Turn off AC breaker measure the voltage between PV to PV by multi meter and check whether it is within DC voltage range If it is higher than the Max allowed DC voltage 1000V you need to reduce the quantity of PV modules Update the firmware of control board to version 0D37 or above and COM board to version 0C30 or above amp Error 104 Model error Update the firmware of control board to version 0D37 or above and COM board to version 0C30 or above amp Error 119 GFCI module check fails Update the firmware of control board to version 0D37 or above and COM board to version 0C30 or above Ill System Fault amp Auto Test Failed The auto test cannot pass gt Auto test function is only activated in model for Italy Please make sure the grid voltage and frequency is normal Restart the inverter and redo it PV Isolation Low PV input insulation impedance is too low 1 Please confirm whether the output of inverter is connected according to user manual 2 Please provide the model value shown as Fig 2 3 2 or Fig 2 3 3 to Gr
20. voltage of the inverter as following steps Fig 4 2 2 Input information interface 1 Connect your PC laptop with inverter via RS232toUSB cable And then start the inverter 2 Run software ShineCorrection Select O1 V PV 1 in Item List dropdown list enter your COM port and inverter address if the inverter can t be connected with other inverter via RS485 you can select the option Auto Inv Add 3 Enter the measured value into Value frame 4 Input setting password Correction click Set button to finish PV1 voltage calibration 12 powering tamorra rowalt ShineCorrection 1 0 A mn 0 e com P Set F Fig 4 2 3 OLV PV 1 PV1 voltage 650 0 05 V PV 2 PV2 voltage 650 0 Note PV1 stands for MPP tracker A PV2 stands for MPP tracker B Table 4 2 1 5 Select O5 V PV 2 in Item List dropdown list and repeat above processes to finish PV2 voltage calibration amp Residual High Leakage current is too high When inverter showing Residual High please restart the inverter for 2 or 3 times If the error still exists please examine if the live and neutral L1 L2 L3 and N are connected well Fig 4 3 1 AC terminal from left t If the live and neutral L and N are ok but the error still exists please replace an inverter amp Output High DCI Output DC current too high The DC offset in the alternating output current is detected too high Please
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