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3.5 Electrical connection 
 

3.5.1 Connection to the Grid (AC output) 

 

 

1)  Add breaker or fuse to AC side, the specification should be more than 1.25 times of 

rated AC output current. 

2)    The PE line of inverter should be connected to the earth, make sure the impedance 

of neutral wire and earth wire less than 10 ohm. 

3)    Disconnect the breaker or fuse between the inverter and the utility. 

4)  The integrated leakage current detection device of the inverter can detect external 

leakage current in real time. When the detected leakage current exceeds the limit 

value, inverter will quickly disconnect with the grid. If the leakage current protection 

device is installed externally, the action current should be 300mA or higher. 

Connect the inverter to the Grid as follows: 

1.    Strip off N/L1/L2/L3 cables as figure 3-5: 

A

C

D

B

 

No.

 

Description

 

Remark

 

A     

Protective layer 

Diameter ranges 

22-27mm 

Length of stripped off 

15mm 

Insulate layer 

Cross section of ac cables 

10-16mm² 

Figure 3-5 Strip off N/L1/L2/L3 cables   

2.    Strip off PE cable as figure 3-6 

 

Figure 3-6 Strip off PE cables 

3.    Insert AC cables through cable gland from outside, Pull the cables through and fix N/L1/L2/L3/PE cables. 

ends to the terminals according to markings 

 

 

Fix (Torque: 2~2.5 N.m) the connector of AC cable to the corresponding terminals. 

Summary of Contents for R3 Pro NAC20K-DT

Page 1: ...0...

Page 2: ...3 Technical data 5 2 4 Grid codes 6 3 Installation and startup 7 3 1 Package information 8 3 2 Installation environment 8 3 3 Installation position 8 3 4 Mounting procedure 9 3 5 Electrical connectio...

Page 3: ...tion or Tips and Tricks on specific subjects 1 3 Important safety information Read this before installing operating or maintaining the inverter Before installation Check for damage to inverter and pac...

Page 4: ...uring parallel string operation is 950V Higher voltages may result in permanent damage to the inverter The selection of PV string output should be based on the optimum utilization of the invested capi...

Page 5: ...T NAC33K DT Figure 2 2 Electrical Terminals 1 DC Switch 2 DC PV terminal 3 Communication port 4 AC terminal 5 LEDs 6 Display screen 7 Keys For safety reasons the use of a DC switch is recommended Betw...

Page 6: ...ax DC Input Current 20A 20A 20A 30A 30A 30A 30A 30A DC Switch Integrated AC Output Data Rated AC Power 20000W 25000W 30000W 33000W Max output power 22000VA 27600VA 30000VA 33000VA Max AC Current 32A 4...

Page 7: ...0 years Certifications Standards Grid Regulation VDE AR N 4105 VDE 0126 1 1 PEA AS4777 EN50549 NB T 32004 2013 CEI0 21 IEC61727 IEC62116 IEC60068 IEC61683 Safety Regulation IEC 62109 1 IEC 62109 2 EMC...

Page 8: ...s IEC61727 28 Mexico Mexico power Grid meet Grid standards IEC61727 60HZ 29 NZ4777 New Zealand power Grid meet Grid standards NZ4777 30 Philippines Philippines power Grid meet Grid standards IEC61727...

Page 9: ...play and possible maintenance activities please install the inverter at eye level 3 Inverters should NOT be installed near inflammable or explosive items Any strong electro magnetic equipment should b...

Page 10: ...should be no less than the following value Figure 3 4 Distance required of Invertors 3 4 Mounting procedure Setp1 Drill 4 Fix 10 holes in the wall according to the dimensions Step2 Fix the wall mount...

Page 11: ...10 Figure 3 5 mounting the inverter...

Page 12: ...it value inverter will quickly disconnect with the grid If the leakage current protection device is installed externally the action current should be 300mA or higher Connect the inverter to the Grid a...

Page 13: ...itch is turned off 2 Make sure PV string polarity confirms with DC connector otherwise it will cause damage to inverter 3 Make sure the maximum open circuit voltage Voc of each PV string does not exce...

Page 14: ...re 3 9 communication interfaces Figure 3 10 RS485 in multiple series Please make sure the RS485 connecting cables not exceed 1000m Communication lines must be separated from other power lines to avoid...

Page 15: ...ter AC side through AC circuit breaker 2 The DC cable connected correctly to the inverter DC side through DC circuit breaker please be attention to the cable connected to the two string correctly and...

Page 16: ...cally When the next day comes the input voltage reaches the start value it will start again automatically 4 User Interface 4 1 Led and key Figure 4 1 LED display No Name Description 1 ESC Button ESC O...

Page 17: ...ate time setting Language setting Grid info Input Password Serial number Firmware update Recovery setting String info Day Yield PV info Inverter type DSP M SW MCU H SW DSP S SW SFLASH_FS Init Clear en...

Page 18: ...r Detailed information about the entire system modules circuits etc Documentation of previous claim exchanges if applicable In the case of an exchange the remainder of the warranty entitlement will be...

Page 19: ...If grid is ok and the problem exists still maybe the fuse in the inverter is open please call service Over Temperature INV OV Temp BST OV Temp AMB OV Temp 1 The internal temperature of inverter is hig...

Page 20: ...uSwAcOCP SwOCP_PV1 4 HwOCP_BST1 4 UHwOCP_BST HwBusOVP uHwBusOVP BusUVP BusOVP PLL fault BusVolt_Ublc IacRms_Ublc VacRms_Ublc DciOCP GFCI 30mA GFCI 60mA GFCI 150mA GFCI 300mA GFCI 5 times uHw_GFCI Fan...

Page 21: ...20 P N 422 00028 01...

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