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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)  All  inverters  incorporate  a  certified  internal  Residual  Current  Device(RCD)  in  order  to 

protect  against  possible  electrocution  and  fire  hazard  in  case  of  a  malfunction  in  the  PV 
array, cables or inverter.There are 2 trip thresholds for the RCD as required for certification 
(IEC  62109-2:2011).  The  default  value  for  electrocution  protection is  30mA,  and  for  slow 
rising current is 300mA.

 

 

Connect the inverter to the grid as follows: 

1.  Strip off L/N/PE cables as figure 3-5:  

 

No. 

Description 

Remark 

Protective layer 

Diameter ranges 

9-16mm 

Length of stripped off 

12mm 

Insulate layer 

50mm 

Cross section of ac cables 

6-10mm² 

Figure 3-6 Strip off PE/N/L cables  

2.  Tighten the nut clockwise & Tighten L/N/PE cable screws to the terminals according to markings. 

 

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

 

Figure 3-7 Connect the inverter to the Grid 

 

3.  Plug Grid side connector into AC connector of inverter end, rotate and tighten clockwise. 

A

C

D

B

Summary of Contents for NAC4K-DS

Page 1: ...0...

Page 2: ...n 8 3 2 Installation environment 8 3 3 Installation position 9 3 4 Mounting procedure 10 3 5 Electrical connection 11 3 6 Starting the inverter 14 4 User interface 14 4 1 Led and key 14 4 2 LCD displa...

Page 3: ...ghout the manual important information is shown at different levels depending on the character of the information as shown here Safety information important for human safety Violation of warnings may...

Page 4: ...fore installing the inverter Check the voltages of the solar modules and make sure they are within the limits of the inverter specifications before connecting them to the inverter Installation Only tr...

Page 5: ...ters 2 1 Mechanical design Figure 2 1 shows the outline dimensions of NAC4K DS NAC5K DS NAC6K DS NAC7K DS NAC8K DS Figure 2 1 Outline dimensions Figure 2 2 shows the electrical terminals of NAC4K DS N...

Page 6: ...3 I O Port 4 Communication port 5 AC terminal 6 LCD 7 LEDs Run Fault 8 Key 2 2 Electrical system design Figure 2 3 wiring diagram of the inverter system Please refer to chapter 3 for the detail conne...

Page 7: ...DC Insulation Monitoring Integrated Input Reverse Polarity Protection Integrated Anti island Protection Integrated Residual Current Monitoring Integrated Over heat Protection Integrated AC Overcurrent...

Page 8: ...49 CZ Czech Republic power Grid meet Grid standards EN50438Y2007 CZ 20 IEC61727 India power Grid 21 Korea Korea power Grid 22 EN50549 SW Sweden power Grid 23 China W China power Grid Grid voltage rang...

Page 9: ...DS and 3 PV connectors for NAC7 8K DS There are 2 PV connectors for NAC4 5 6K DS and 3 PV connectors for NAC7 8K DS Figure 3 1 package information 3 2 Installation environment 1 In order to achieve o...

Page 10: ...must be suitable for the inverter s weight and dimensions 2 Mount on a solid surface 3 Select a well ventilated place sheltered from direct sun radiation Figure 3 3 installation position In considerat...

Page 11: ...holes in the wall according to the dimensions Step2 Fix the wall mounting bracket on the wall with 4 expansion bolts in accessory bag Setp4 Place the inverter on the wall mounted bracket and install...

Page 12: ...inverter There are 2 trip thresholds for the RCD as required for certification IEC 62109 2 2011 The default value for electrocution protection is 30mA and for slow rising current is 300mA Connect the...

Page 13: ...s 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 exceed the inverter input voltage Vmax under any condition 4...

Page 14: ...d 1000m 2 Communication lines must be separated from other power lines to avoid communications interference Remark RS485 port PIN3 A PIN4 B Figure 3 9 RS485 Port Figure 3 10 RS485 in multiple series F...

Page 15: ...ge 16 chapter 4 3 Step4 Then the inverter will turn into self check mode and the LCD panel will display the remaining time of connect simultaneously Step5 After the inverter turn into normal mode it f...

Page 16: ...er W Clear events Power W Factory setting Power W Clear E total Power W PF xxx Power W Setting Add Pac W Factory setting English Factory setting VDE4105 Factory setting 2 Factory setting Factory setti...

Page 17: ...xport power 5 Set Export power as 1 press pushbutton long to save the value 4 7 Self Test in accordance with CEI 0 21 Applies to Italy only The self test is only required for inverters which are commi...

Page 18: ...ys setting Other AUTOTEST enter into Auto Test interface 4 Click Execute to start the test 5 The inverter will automatically run the test until the screen shows Test end 6 Click Read to read the test...

Page 19: ...Detailed information about the entire system modules circuits etc 5 Documentation of previous claim exchanges if applicable In the case of an exchange the remainder of the warranty entitlement will b...

Page 20: ...bility 4 If grid is ok and the problem exists still maybe the fuse in the inverter is open please call service Low Temp Over Temp 1 The internal temperature of inverter is higher or lower than specifi...

Page 21: ...20 P N 422 00022 02...

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