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SUNNY CENTRAL 250U - Installation Guide

1. 40 SC250U 1US093413 Installation Guide SMA America LLC Connecting Optional Communication Devices 7 3 Sunny WebBox optional For more information on the Sunny WebBox e g operation see its technical description The technical description is included in the scope of delivery and is available for download at www SMA America com The communication between the Sunny WebBox and the PC or the network is conducted via Ethernet The Sunny WebBox is equipped with an integrated network connection which enables it to be connected to any Ethernet network The connection supports Ethernet and Fast Ethernet networks The speed adapts automatically to the connected switch router or PC Sunny WebBox in a Network The Sunny WebBox can be integrated into a network via a router or a switch Ifthe Sunny WebBox is permanently integrated into a network with Internet access it can automatically transmit the data of your PV system to Sunny Portal A fio Data Cable The data cable for the connection of the Sunny WebBox to a network must meet the following requirements e The data cable must not be longer than 330 ft 100 m e Use High quality straightthrough patch cables shielded twisted pair cables of category 5 CAT 5 or higher Installation Guide SC250U IUSO9341
2. 8 3 Connection of the PV Modules Do not connect the PV modules until the optional communication cables have been connected see section 7 Connecting Optional Communication Devices page 38 DC distribution boxes must be installed between the PV modules and the Sunny Central where the PV module cables are gathered and led to the Sunny Central There must be breakers in the distribution boxes which allow the disconnection of the DC side The PV modules are negatively grounded by the Sunny Central The installer is responsible for the Photovoltaic System Grounding which must be installed per the requirements of Sections 690 41 through 690 47 of the National Electrical Code ANSI NFPA 70 1 DANGER Voltage is present in PV modules exposed to light Death resulting from electric shock l Cover the PV modules 2 Switch off the fuses in the DC distribution boxes e g Sunny Central String Monitor and secure them against reconnection 3 Follow all safety precautions of the module manufacturer 1 DANGER Normally grounded conductors may be ungrounded and energized when a ground fault is indicated Risk of electric shock e Test before touching e Work on the Sunny Central must be carried out by qualified personnel Technical Data for the Connection of the PV Modules Number of strings A 8 or 6 12 DC input voltage 330 Vpc 600 Voc Maximum DC current 800 A 48 SC250U 1US093413 Installation Guide SM
3. Verify that the PV ground wires are connected to ground and are isolated from PV or PV o NOO Di Verify that the AC neutral wire is connected to the AC Neutral terminal 9 Verify that the AC phase wires are connected correctly 10 Verify that all AC phase wires are tightened to the proper torque specification 11 Verify that the AC ground wire is connected correctly 12 Inspectthe interior of the Magnetics Cabinet and insure that it is free of any tools foreign objects water debris or documents 13 Verify that the side panels of the Magnetics Cabinet are closed securely and latched 14 Leave Control Cabinet and Interface Cabinet open for measurement purposes 15 Inspectthe interior of the Control Cabinet and Interface Cabinet to insure that they are free of any tools foreign objects water debris or documents 56 SC250U 1US093413 Installation Guide SMA America LLC Commissioning 16 Ensure that the area around the Sunny Central is clear of any tools foreign objects or debris 17 Check the AC connection for a possible clockwise phase sequence For this purpose hold the terminals of the phase sequence indicator onto the three phases of the AC connection in the Sunny Central The indicator shows you whether there is clockwise phase sequence 9 2 Switching the Sunny Central On 1 DANGER During operation high voltages are present in the Sunny Central Death resulting from electric shock e Do not operate t
4. 4 Mark all the holes for the conduits You need one conduit for the AC cables one conduit for the communication cables and four six conduits for the DC cables one conduit for each DC input A Example for a plate prepared for the A connection of 4 DC strings E c c Installation Guide SC250U 1US093413 35 Attaching the Conduits O 50 O gt D B Examplefora plate for the connection of 6 DC strings C Conduit for DC cable D Conduit for AC cable E Conduit for communication cable Punch holes for the conduits Check the seal of the plate Attach the plate to the Sunny Central SMA America LLC 10000 OOO Attach the screws and washers and tighten with a torque of 31 in lbs Insert the conduits into the openings Attach the conduits with the appropriate hubs 6 2 Insert Cables from below into the Sunny Central Insert the PV generator cables the AC cables and the data cables into the Sunny Central from the bottom through the foundation i 36 Remove the ground cable A from the plate at the bottom of the Interface Cabinet Loosen the 16 screws on the plate at the bottom of the Interface Cabinet by turning them counterclockwise Remove the screws and the plate The screws will be used again The cable tunnel is encased in 2 u shaped metal plates Place a u shaped plate in the rear portion ofthe cable tunnel The holes in the narrow edge of the u shape
5. EE These parameters are for operation with a generator Contact SMA if you have questions regarding the operation of the Sunny Central with a generator SpntRemEna Off On On Shutting down the Sunny Central ee pee With these parameters the Sunny Central can be shut down remotely Tm hhmmss Current Time DT ee 12 2 Changing Parameters The changing of the parameters itself is described in the Sunny Central s User Manual 68 SC250U 1US093413 Installation Guide SMA America LLC Technical Data 13 Technical Data PV Generator Connection Data DC input voltage 330 V 600 V Input voltage MPP range DC 330 V 600 V DC starting voltage 400 V Max input current 800A DC volge ripple adjustable peak to peak Grid Connection Data General Data Width x Heigh x Depth 109 7 in x 79 8 in x 32 7 in tnt eee maximum operating per 3 300 ft 1 005 m Ambient temperature without power reduction Ambient temperature with power reduction Output power at 122 F 50 C i Internal consumption in Standby Mode Internal consumption including fans including roof with respect to IEEE 1547 Installation Guide SC250U 1US093413 69 Technical Data SMA America LLC Efficiency 98 x 96 Q c E E 94 D E 5 92 gt O 90 O Zo 50 75 100 Output power Maximum efficiency at 330 V 97 5 Maximum efficiency at 480 V 97 2 auxiliary power and fans
6. e When working on the Sunny Central wear protective gloves NOTICE The components in the Sunny Central can be damaged by electrostatic discharge e When working on the Sunny Central and when handling the components observe all ESD safety regulations Discharge electrostatic charge by touching the grounded Sunny Central enclosure Only then is it safe to touch any electronic components Storage of Handbooks Keep this documentation in the immediate vicinity of the Sunny Central It must be accessible to service and maintenance personnel at any time Do not store the documentation or any other papers in the Sunny Central 14 SC250U 1US093413 Installation Guide SMA America LLC The Sunny Central 3 The Sunny Central In this section you will see how to identify the Sunny Central A short description of the Sunny Central s design and functions are given here 3 1 System Overview The Sunny Central is an inverter for indoor and outdoor The enclosure is made of steel which has been zinc plated and coated and which conforms to the NEMA 3R protection rating NEMA 3R means that the Sunny Central is protected against dust and water when it is closed Operating Principles The PV modules convert a portion of sunlight into electrical energy direct current Afterwards the Sunny Central converts the direct current into alternating current and feeds it into the public grid This current may be used directly or it may be sold to you
7. page 60 Open the Magnetics Cabinet as described in section 10 3 Opening the Magnetics Cabinet page 6 1 SC250U 1US093413 Installation Guide SMA America LLC Transport and Installation 5 4 2 Inserting the Cables into the Cabinets This section shows you how to connect the two cabinets of the Sunny Central with each other electrically Cables are attached on the left side of the Control Cabinet and the right side of the Magnetics Cabinets each of which you connect to the opposite cabinet The cables are pulled into the inside ofthe Magnetics Cabinet or Control Cabinet via PG cable glands The position of the cable openings in the Magnetics Cabinet A and the Control Cabinet B is shown in the figure below 1 Ina counterclockwise direction open the three bottom PG cable glands in the Magnetics Cabinet and the six PG cable glands on the right side of the Control Cabinet Keep opening the PG cable glands until you can pull the cables into the inside of the cabinets Do not unscrew the PG cable glands Figure to the right Open the PG cable gland in the Magnetics Cabinet 2 Feed the 3 AC cables from the rear of the Control Cabinet into the 3 lower holes at the front of the Control Cabinet Magnetics Cabinet figure to the right position G e H 1 ed O 3 Feed the 6 AC cables from the Magnetics Cabinet e e A into the corresponding holes in the Control Cabinet D
8. C250U IUS093413 Installation Guide SMA America LLC Opening the Sunny Central 10 2 Opening the Interface Cabinet 1 Switch off the Sunny Central as described in section 10 1 Opening the Control Cabinet page 60 2 Put the key into the Interface Cabinet s lock and open it M The handle flips up 3 Grasp the handle from below and pull it up V The door s catch is released and the door can be opened 4 Open the door CAUTION The DC fuses in the Interface Cabinet become hot during operation Danger of burn injury due to hot components e When working on the Sunny Central wear protective gloves 5 Verify the absence of voltage with respect to ground at the AC clamp with an appropriate meter If there is a voltage present the installation must be checked 6 Verify the absence of voltage with respect to ground at the DC clamp with an appropriate meter If there is a voltage present the installation must be checked 10 3 Opening the Magnetics Cabinet 1 Switch off the Sunny Central as described in section 10 1 Opening the Control Cabinet page 60 2 Make sure that no voltage is present as described in section 10 2 Opening the Interface Cabinet page 61 3 Remove 8 screws from the front of the Magnetics Cabinet with a torx screwdriver 4 Remove the wall by pulling it forward Installation Guide SC250U 1US093413 61 Opening the Sunny Central SMA Am
9. Data Cable Recommendation SMA also provides data cables Please contact your electrician or wholesaler Installation Guide SC250U 1US093413 39 Connecting Optional Communication Devices SMA America LLC 7 2 1 Connecting the Data Cable of the Sunny SensorBox Connect the data cable to the socket A on the bottom of the Sunny Sensor 485Hub 1 Open the Interface Cabinet as described in section 10 2 Opening the Interface Cabinet page 61 2 Route the data cables separately from AC and DC cables Draw the data cable into the Sunny Central see section 6 Attaching the Conduits page 35 3 Remove the insulation of the data cable by approx 2 4 in 60 mm and uncover the shield 4 Uncover the wires about 1 8 in 45 mm 5 Strip the wires about 0 2 in 5 mm i Odia di 1 6 in 0 2 in 15 mm 40 mm 5 mm 6 Connect the wires to the connector as shown in the gt Q e CN figure on the right SA La EP RR SR Sa A e e o Uim B 7 Note down the wire color UAL CAGAS 12 V ap TTT riesco D D 8 Insert the plugs into the socket on the bottom of the Sunny Sensor 485Hub 9 Close the Sunny Central ACOE The operating manual of the Sunny SensorBox shows you how to connect the data cable in the SensorBox and connect the sensors to the Sunny SensorBox
10. 13 the Sunny Central e For installing the Sunny Central in closed rooms an air supply of 2 355 CFM 4 000 m3 h is needed e For more information see section 13 Technical Data page 69 20 SC250U 1US093413 Installation Guide SMA America LLC Transport and Installation 5 1 3 Minimum Clearance Observe the specified minimum clearances for the cables ventilation and for opening the doors An air supply of 2 355 CFM 4 000 m3 h is needed for installing the Sunny Central in closed rooms Cables inserted from Minimum clearance Recommended clearence a TT FA Jom 508 me Bin 06 mn 0 0 ein 152 mm 2070 1508 mm __ b below Sin 152mm 20 n 508 mm E Resi a A FT area Installation Guide SC250U 1US093413 21 Transport and Installation SMA America LLC 5 1 4 Characteristics of the Base e The foundation must be made of concrete e The mounting surface must be level and strong enough to support the weight of the inverter The evenness of the foundation must be less than O 1 in 2 5 mm per meter e The width and depth of the base must be at least the same size as the Sunny Central e To insert the cables from below the cable conduits must be laid in the foundation see section 6 2 Insert Cables from below into the Sunny Central page 36 22 SC250U 1US093413 Installation Guide SMA America LLC Transpor
11. Before connecting the cables clean the contact surfaces Use only the non woven abrasive delivered with the Sunny Central Do not clean the surfaces with sandpaper Do not touch the contact surfaces after they have been cleaned 2 Place the cable gland with the 6 AC cables and the ground cable on the opening of the Magnetics Cabinet Connect cable W53 to copper busbar A Connect cable W54 to copper busbar B Connect cable W55 to copper busbar C Qv m de Tighten all terminal connection bolts with a torque wrench to 230 in lbs 26 Nm 7 Connect the two plugs of the signal cables to sockets 1 10 and 11 20 in the Magnetics Cabinet 8 Place the cable gland on the opening 9 Attach and tighten the four nuts Installation Guide SC250U 1US093413 29 Transport and Installation SMA America LLC 10 Connect the ground cable to the bolt in the Magnetics Cabinet and tighten it with a torque wrench 5 4 4 Connecting the Cables in the Control Cabinet This section shows you how to connect cables W50 W50 1 W51 W51 1 W52 and W52 1 to the copper busbars under the power units in the Control Cabinet the tin plated copper busbar in the Control Cabinet Figure to the right Layout for connecting a cable lug to A B a 1 Nut Lock washer tin plated copper busbar S
12. Discharge electrostatic charge by touching the grounded Sunny Central enclosure e Only then is it safe to touch any electronic components NOTICE Seeping moisture during installation of the Sunny Central Damage to the electronics of the Sunny Central e Donotopen the Sunny Central when it is raining or when a high humidity is present gt 95 For conduit hubs use only UL Listed rainproof or wet location hubs complying with UL 514B for entry into the enclosure 38 SC250U 1US093413 Installation Guide SMA America LLC Connecting Optional Communication Devices 7 1 Position of the Communication Devices The Sunny WebBox is located on the inside of the Interface Cabinet s door zT A Sunny Sensor 485Hub see section 7 2 Connecting the Sunny SensorBox optional page 39 Bo Sunny WebBox see section 7 3 Sunny WebBox optional page 41 7 2 Connecting the Sunny SensorBox optional This Section describes how to connect the Sunny SensorBox to the Sunny Sensor 485Hub in the Sunny Central Data Cable The data cable for the connection of the Sunny SensorBox to the Sunny Sensor 485Hub must meet the following requirements e The data cable must not be longer than 4 000 ft 1 220 m e Use cables with a section of 2 x 2 x AWG 24 shielded twisted pair cables
13. Guide SC250U IUSO93413 53 Electrical Connection SMA America LLC Technical Data for the AC Connection Cable A B C N Copper conductors only use solid or stranded copper only EN i NN NR Cables A B C 3 600 kcmil All 194 F 90 C copper wire 315 in NN 304 mm lbs 35 Nm tightening torque 250 kcmil All 194 F 90 C copper wire 315 in 127 mm lbs 35 Nm tightening torque N 0 1 or2 4 AWG 600 kcmil All 194 F 90 C copper wire 315 in 277 V WYE 21 mm 304 mm lbs 35 Nm tightening torque 8 4 1 Connecting AC wires to the Sunny Central The AC cables are connected to the screw terminals A in the middle of the Interface Cabinet to the left 1 DANGER High voltages are present in the live components of the low voltage grid Death resulting from burning and electric shock l Strip the cable by about 1 2 in 30 mm 1 2 in 30 mm 54 SC250U 1US093413 Installation Guide SMA America LLC Electrical Connection 2 Open the screw terminal completely For 277 V WYE grid open screw terminals A B C and N 3 Plug the copper inner conductors of the cables into the screw terminal 4 Tighten the screw terminal using an Allen key The required torque is 315 in lb 35 Nm 5 Check the AC connection for a possible clockwise phase sequence For this purpose hold the terminals of the phase sequence indicator onto
14. contact the local utility company This connection must be made only by qualified personnel Wiring of the Sunny Central 250U must be made by qualified personnel only 6 SC250U 1US093413 Installation Guide SMA America LLC Table of Contents Table of Contents 1 1 1 2 1 3 1 4 2 2 1 2 2 3 3 1 3 2 3 3 3 4 3 5 4 4 1 4 2 4 3 5 5 1 5 1 1 5 1 2 5 1 3 5 1 4 5 2 5 2 1 Notes on this Manual 0 cece cece ences 10 HONG tio r scita ie ea 10 Valois ganza eset Alain 10 SV ena os Bee ues TI STI TETIO CUT 10 Structure of this Documentation 10 Salely 2o Fes PAM ar EE RS 12 Appropriate Usdg6 cscsss sexes ike REM Ea 12 SelebvInsirUGllons cese estare DR ERSUDEE SA pane ewes 13 Ine Sunny Central i siria 15 System OVEIVIEW xu ti i cues atr a Lead b bees 15 The Sunny Central s Design cece ee eee 15 Location of the Safety Notices 0 0000 cece 16 Identifying the Sunny Central 17 BEN ea EEEE CT vena ek E E E 17 Unpacking erene e del a RE AE 18 Unpacking and Inspection sis nananana ELI 18 SCOPE On Dellvely oo ad crete SELLA 19 DIOL NE NN ER E E EE TT c EIL eta O LIS P ie 19 Transport and Installation 20 Choosing the Installation Site 20 Dimensions and Weight errare ila 20 Ambient Condilionsrsd0agesss arera riri A Tissu eieU ES TSLo bette 20 Minim m Clearance iS qon E ERE be bak esa e ee 21 Charaetensfics on ING BdS6 an renza us dr
15. not included Deviation Voltage measurement Frequency measurement Disconnect time 70 SC250U IUS093413 Installation Guide SMA America LLC Technical Data 13 1 Torques and Cable Sizes Copper conductors only use solid or stranded copper only Connection of the PV Modules e The following cable sizes are minimum sizes Itis possible to insert combinations of different fuse sizes but the maximum fuse sizes are 4x 350A or 6 x 250 A Sunny Central with 4 DC Fuses each 350 A max Number of DC Cable Size Torque a ee a DC DC PE 4 300 kcmil All 194 F 90 C copper 2 0 AWG tightening torque Ei 67 mm Sunny Central with 6 DC fuses each 250A max Number of DC Cable Size Torque Strings DC DC PE 4 0 AWG All 194 F 90 C copper 107 mm wire 315 in lbs 35 Nm 12 tightening torque Connection to the AC Grid Number of AC Cable Size 600 kcmil All 194 F 90 C copper 304 mm wire 315 in lbs 35 Nm tightening torque 250 kcmil All 194 F 90 C copper 127 mm wire 315 in lbs 35 Nm tightening torque 4 AWG 600 kcmil All 194 F 90 C copper 21 mm 304 mm wire 315 in lbs 35 Nm tightening torque 3 0 AWG 600 kcmil 500 in lbs 56 Nm 85 mm 304 mm Installation Guide SC250U IUSO93413 71 Contact SMA America LLC 14 Contact If you have technical problems concerning our products contact your installer or the SMA Serviceline W
16. only as described in this manual Any equipment used for the transport of the Sunny Central must be suitable for the weight of the Sunny Central Do not tilt the Sunny Central during transport 5 3 1 Equipment for Transport The Sunny Central is shipped in two parts The following equipment can be used for the transport of the Sunny Central e Crane with an according fork A for the transport of the Sunny Central e Forklift or pallet truck B Example of Transporting the Sunny Central Cabinet A B c m gt tab Po i Any equipment used for the transport of the Sunny Central must be suitable for the weight of the Sunny Central The left cabinet Magnetics Cabinet of the Sunny Central weighs 2 710 lbs and the right cabinet Control and Interface Cabinet weighs 1 490 Ibs 24 SC250U 1US093413 Installation Guide SMA America LLC Transport and Installation 5 3 2 Center of Gravity of the Sunny Central The center of gravity of the Sunny Central is marked on the packaging with the symbol on the right The center of gravity is not in the middle of the Sunny N Central 5 4 Installing the Sunny Central 5 4 1 Removing the Kick Plates from the Sunny Central s Kick plates are located on the front and back of the Sunny Central The position of the kick plates is shown in the figure to the right The kick plates are mounted on th
17. part or all of the SMA equipment and or other equipment connected to the SMA equipment or personal injury 1 DANGER DANGER indicates a hazardous situation which if not avoided will result in death or serious injury WARNING WARNING indicates a hazardous situation which if not avoided could result in death or serious injury CAUTION CAUTION indicates a hazardous situation which if not avoided could result in minor or moderate injury NOTICE NOTICE is used to address practices not related to personal injury 4 SC250U 1US093413 Installation Guide SMA America LLC Important Safety Instructions Other Symbols in this document In addition to the safety and hazard symbols described on the previous pages the following symbol is also used in this installation guide Information I This symbol accompanies notes that call attention to supplementary information that you must know and use to ensure optimal operation of the system Markings on this product The following symbols are used as product markings with the following meanings Warning regarding dangerous voltage The product works with high voltages All work on the product must only be performed as described in it s documentation Electric arc hazards The product has large electrical potential differences between its conductors Arc flashes can occur through air when high voltage current flows Do not work on the product during operation B
18. 0 ccc eee eee 60 Opening the Interface Cabinet 2 0 0 0 000 eae 61 Opening the Magnetics Cabinet 61 Maintenance ues EROR ale aan 63 Sunny Central Maintenance Work 63 Replace DC fuse LL 63 Pardmeler ess 90422 9X CEDAT Eau ba bee uva 64 l diciinererDescrbpliolissas sue ste eres 64 Changing Parameters onnaa dut nam dU tne di d dit 68 Techinical Data 2 Er Se ag AE Ra eee 69 Torques and Cable Sizes svsssta sip dilata 7 CONG o2 9549 ebERAd uate add arx mA V dE d as 72 Appendix Celsius to Fahrenheit Conversion 73 Installation Guide SC250U 1US093413 9 Notes on this Manual SMA America LLC 1 Notes on this Manual This manual describes the installation and the commissioning of a Sunny Central 250U with 4 and 6 DC fuses This manual does not cover any details concerning PV modules Information concerning the PV modules is available from the manufacturer of the PV modules 1 1 Target Group This manual is for the installer of a Sunny Central 250U An installer is an electrician or technician that is trained to deal with the dangers and hazards involved in installing electric devices 1 2 Validity This manual is valid for the Sunny Central 250U with the date of manufacture 11 09 November 2009 and later 1 3 Syntax In this document the Sunny Central 250U is referred to as Sunny Central In this document SMA America Production LLC is referred to in the following as SMA 1 4
19. 1US093413 17 Unpacking SMA America LLC 4 Unpacking This section describes what to look out for upon receiving your Sunny Central and who to turn to if your Sunny Central is damaged 4 1 Unpacking and Inspection All SMA Sunny Centrals are thoroughly checked before they are packaged and shipped Although they are shipped in sturdy packaging damage can still occur during shipping and delivery It is important to carefully inspect the shipping container and contents prior to installation If you detect any external damage after unpacking report the damage immediately to your SMA dealer and shipping company that delivered the unit If it becomes necessary to return the Sunny Central use the original packing material If you need assistance with a damaged Sunny Central contact your SMA dealer or the SMA Serviceline Contact information for the SMA Serviceline is provided below SMA Solar Technology America LLC 4031 Alvis Court Rocklin CA 95677 Tel 1 916 625 0870 Tel 1 877 697 6283 Toll free available for USA Canada and Puerto Rico Fax 1 916 625 0871 Service SMA America com www SMA America com 18 SC250U 1US093413 Installation Guide SMA America LLC Unpacking 4 2 Scope of Delivery ee eu I gt gt Magnetics Cabinet Interface and Control Cabinet Ca Cover for the cables between the cabinets of the Sunny Central and screws gt Ventilation plates with air filters for in
20. 250U 1US093413 Installation Guide SMA America LLC
21. 3 41 Connecting Optional Communication Devices SMA America LLC Sunny WebBox Connected to a PC Laptop To read out the data the Sunny WebBox can be connected to a PC or Laptop This connection should not be made long term it only serves the purpose of reading the data i Cable The cable for the connection of the Sunny WebBox to a PC Laptop must meet the following requirements e The cable must not be longer than 330 ft 100 m e Use High quality crossover cable shielded twisted pair cables of category 5 CAT 5 or higher 7 3 1 Installing the WebBox in the Sunny Central 1 Open the Interface Cabinet as described in section 10 2 Opening the Interface Cabinet page 61 2 Hook both lower brackets of the Sunny WebBox under the lower edge of the top hat rail Press the Sunny WebBox upwards Snap the top edge of the mounting rail into the top mounting brackets of the Sunny WebBox 42 SC250U 1US093413 Installation Guide SMA America LLC Connecting Optional Communication Devices 7 3 2 Connecting the Sunny WebBox to the Sunny Central 1 Plug the W215 connector into the SMA COM socket B of the WebBox 2 Insert the power supply plug into socket A of the WebBox 7 3 3 Connecting the Cable to the Sunny WebBox The network connection on the Sunny WebBox is marked as displayed on the adjacent graphic The same marking for the network connections is usuall
22. A America LLC Electrical Connection Technical Data for the Cables of the PV Modules Copper conductors only use solid or stranded copper only Connection of the PV Modules e The following cable sizes are minimum sizes e Itis possible to insert combinations of different fuse sizes but the maximum fuse sizes are Ax 350A or 6 x 250A Sunny Central with 4 DC Fuses each 350 A max Number of DC Strings Cable Size 300 kcmil 152 mm All 194 F 90 C copper wire PB 2 0 AWG 67 mm 315 in lbs 35 Nm tightening torque Sunny Central with 6 DC Fuses each 250A max Number of DC Strings Cable Size PB 4 0 AWG 107 mm All 194 F 90 C copper wire 2 AWG 33 mm 315 in lbs 35 Nm tightening torque 8 3 1 PV Modules DC Connection Negative Grounding The illustrations on the right shows a Sunny Central which is equipped for connection to 6 or 12 DC strings 1 Strip the cable by about 1 2 in 30 mm 1 2 in 2 Open the screw terminal completely Installation Guide SC250U 1US093413 49 Electrical Connection SMA America LLC 3 Plug the copper inner conductor of the cable into the screw terminal 4 Tighten the screw terminal using an Allen key The required torque is 315 in lbs 35 Nm 5 Connect all DC cables of the PV modules as described above 8 3 2 PV Modules DC Connection Negative Grounding The illustration on the right shows a
23. Central Inverter SUNNY CENTRAL 250U Installation Guide SC250U 1US093413 98 4000713 Version 1 3 SMA America LLC Legal Restrictions Copyright 2010 SMA America LLC All rights reserved 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 SMA America LLC SMA America LLC makes no representations express or implied with respect to this documentation or any of the equipment and or software it may describe including with no limitation any implied warranties of utility merchantability or fitness for any particular purpose All such warranties are expressly disclaimed Neither SMA America LLC nor its distributors or dealers shall be liable for any indirect incidental or consequential damages under any circumstances The exclusion of implied warranties may not apply in all cases under some statutes and thus the above exclusion may not apply Specifications are subject to change without notice Every attempt has been made to make this document complete accurate and up to date Readers are cautioned however that SMA America LLC reserves the right to make changes without notice and shall not be responsible for any damages including indirect incidental or consequential damages caused by reliance on the material presented including but not limite
24. ESD safety regulations Discharge electrostatic charge by touching the grounded Sunny Central enclosure Only then it is safe to touch any electronic components NOTICE Seeping moisture may enter the Sunny Central during installation Damage to the electronics of the Sunny Central Do not open the Sunny Central when it is raining or when a high humidity is present 95 For conduit hubs only use UL Listed rainproof or wet location hubs complying with UL 514B for entry into the enclosure Installation Guide SC250U 1US093413 45 Electrical Connection SMA America LLC 8 1 Connection Area Sunny Central for the Connection of 6 DC strings Left side Back side Right side Door UN Stai nu o O OO OO OO OO OO OO Base D o elf el ell ell o 00 00 00 00 00 00 Lu OOO Bo Grou
25. O figure to the right position A B C D E F DE 4 Feedthe 2 sockets containing signal cables from the Control Cabinet into the Magnetics Cabinet figure to the right position K Magnetics Cabinet owe reo Installation Guide SC250U 1US093413 27 Transport and Installation SMA America LLC 5 Place the Magnetics Cabinet to the desired location of the base The holes for the screws in the i LEES ia BS Sunny Central and the holes in the base must fit 6 Pull all the cables into the Magnetics Cabinet as far ll as they will go 7 Tighten the PG cable glands in the Control Cabinet in a clockwise direction 5 4 3 Connect the Cables in the Magnetics Cabinet This section shows you how to connect cables W53 W54 and W55 to the copper busbars under the transformers in the Magnetics Cabinet A A B C al D B E BS Figure to the right Layout for connecting a cable lug to the aluminum busbar in the Magnetics Cabinet A Nut Lock washer Cable lug Copper busbar Screw head 28 SC250U 1US093413 Installation Guide SMA America LLC Transport and Installation NOTICE When transporting and storing the Sunny Central oxide layers may form on the contact surfaces of the cable connection Yield loss due to poor electrical conductivity 1
26. Structure of this Documentation The Sunny Central s installation comprises several steps Here we will describe the contents you will find in the sections of the installation instructions The instructions are divided into the following sections Section 2 Safety In this section you will find general safety directions which you must observe throughout the entire installation process Pay special attention to this section so as to avoid personal and material damages Section 3 The Sunny Central In this section you will see how to identify the Sunny Central A short description of the Sunny Central s design and functions are given here Section 4 Unpacking This section describes what to look out for upon receiving your Sunny Central and who to turn to if your Sunny Central is damaged Section 5 Transport and Installation This section shows you how to find the best installation site for your Sunny Central It provides step by step instructions on how to transport and install the Sunny Central and connect the cabinets with each other electrically Observe all safety precautions in this section to avoid material and personal damages 10 SC250U 1US093413 Installation Guide SMA America LLC Notes on this Manual Section 6 Attaching the Conduits In this section you will learn where to insert the cables in the Sunny Central and where to punch the holes for the conduits Section 7 Connecting Optional Communication Devices The S
27. Sunny Central which is equipped for connection to 6 or 12 DC strings Strip the cable by about 1 2 in 30 mm 2 Open the screw terminal completely 3 Plug the copper inner conductor of the cable into the screw terminal 4 Tighten the screw terminal using an Allen key The required torque is 315 in lb 35 Nm 5 Connect all DC cables of the PV modules as described above 50 SC250U 1US093413 Installation Guide SMA America LLC Electrical Connection 8 3 3 PV Modules DC Connection Positive Grounding The illustration on the right shows a Sunny Central which is equipped for connection to 6 or 12 DC strings Strip the cable by about 1 2 in 30 mm 2 Open the screw terminal completely 3 Plug the copper inner conductor of the cable into the screw terminal 4 Tighten the screw terminal using an Allen key The required torque is 315 in lbs 35 Nm 5 Connect all DC cables of the PV modules as described above Installation Guide SC250U 1US093413 51 Electrical Connection SMA America LLC 8 3 4 PV Modules DC Connection Positive Grounding The illustration on the right shows a Sunny Central which is equipped for connection to 6 or 12 DC strings 1 Strip the cable by about 1 2 in 30 mm Open the screw terminal completely Plug the copper inner conductor of the cable int
28. age 72 Installation Guide SC250U 1US093413 59 Opening the Sunny Central SMA America LLC 10 Opening the Sunny Central 1 DANGER Electric shock due to improper opening of the Sunny Central Death resulting from burning and electric shock All procedures described in this Section must be conducted by qualified personnel only Observe the sequence described here when opening the Sunny Central If problems occur while performing the work described here contact SMA 10 1 Opening the Control Cabinet ie 60 Turn the stop start switch on the Control Cabinet s door to the left until it reaches the stop position The AC and DC switches in the Sunny Central switch off audibly Switch off the AC circuit breaker in the array and secure it against accidental switching on ZI When the Sunny Central is disconnected the display turns off Cover the PV modules Switch off the fuses in the DC distribution boxes e g Sunny Central String Monitor and secure them against reconnection Wait 5 minutes Reason when the Sunny Central is switched off voltage will remain in the internal capacitors for 5 minutes V The Sunny Central is deactivated and can be opened Put the key into the Control Cabinet s lock and open it V The handle flips up Grasp the handle from below and pull it up V The door s catch is released and the door can be opened Open the door
29. crew head c jcobleng 30 SC250U 1US093413 Installation Guide SMA America LLC Transport and Installation NOTICE When transporting and storing the Sunny Central oxide layers may form on the contact surfaces of the cable connection Yield loss due to poor electrical conductivity 1 Before connecting the cables clean the contact surfaces Use only the non woven abrasive delivered with the Sunny Central Do not clean the surfaces with sandpaper Do not touch the contact surfaces after they have been cleaned 2 Connect cable W50 and W 50 1 to tin plated copper busbar U 3 Connect cable W51 and W 51 1 to tin plated copper busbar V 4 Connect cable W52 and W 52 1 to tin plated copper busbar W 5 Tighten all terminal connection bolts with a torque wrench to 230 in lbs 26 Nm 5 4 5 Attach the Sunny Central to the base The mounting holes A are located on the inside of the Sunny Central s stands The holes for mounting the Sunny Central to the base are 1 34 in x 0 55 in Use appropriate mounting material Figure to the right Mounting hole in the front left stand of the Magnetics Cabinet l Insert screws in all 12 mounting holes of the Sunny Central for the position of the mounting holes refer to section 5 2 Preparation of the Base page 23 2 Tighten screws 5 4 6 Install the Cover Be
30. d plate must overlap the holes in the Interface Cabinet SC250U 1US093413 Installation Guide SMA America LLC Attaching the Conduits 5 10 11 12 Place a u shaped plate in the front portion of the cable tunnel The holes in the narrow edge of the u shaped plate must overlap the holes in the Interface Cabinet Place 14 screws in the holes see the illustration on the right Do not use the middle holes on the long side of the cable tunnel Tighten the screws evenly Place the sealing splints on the middle holes on the right and left of the cable tunnels y Place 5 screws in each of the holes see illustration on n ME the right Tighten the screws evenly Connect the ground cable to the cable tunnel Seal the cable tunnel down to the foundation p The cable tunnel is encased Installation Guide SC250U IUSO93413 37 Connecting Optional Communication Devices SMA America LLC 7 Connecting Optional Communication Devices The Sunny Central can be equipped with a Sunny WebBox and or a Sunny SensorBox This section explains how the Sunny WebBox and the Sunny Sensor Box in the Sunny Central is connected NOTICE The components in the Sunny Central can be damaged by electrostatic discharge e When working on the Sunny Central and when handling the components observe all ESD safety regulations e
31. d to omissions typographical errors arithmetical errors or listing errors in the content material All trademarks are recognized even if these are not marked separately Missing designations do not mean that a product or brand is not a registered trademark The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG Inc and any use of such marks by SMA America LLC is under license SMA America LLC 3801 N Havana Street Denver CO 80239 U S A Installation Guide SC250U 1US093413 3 Important Safety Instructions SMA America LLC IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important instructions for Sunny Central 250U PV inverter that must be followed during installation and maintenance of the PV inverter The Sunny Central 250U is designed and tested according to international safety requirements but as with all electrical and electronic equipment certain precautions must be observed when installing and or operating the Sunny Central 250U To reduce the risk of personal injury and to ensure the safe installation and operation of the Sunny Central 250U you must carefully read and follow all instructions cautions and warnings in this installation guide Warnings in this document A warning describes a hazard to equipment or personnel It calls attention to a procedure or practice which if not correctly performed or adhered to could result in damage to or destruction of
32. e cabinets of the Sunny Central by screws A Magnetics Cabinet front side 4 screws in total 2 screws on the right and 2 screws on the left Control and Interface Cabinet front side 6 screws in total 2 screws on the right 2 screws in the middle and 2 screws on the left Installation Guide SC250U IUS093413 25 Transport and Installation SMA America LLC 26 Interface and Control Cabinet rear side 6 screws in total 2 screws on the right 2 screws in the middle and 2 screws on the left Remove kick plates on the front and on the rear of both cabinets of the Sunny Central using a torx screwdriver Remove the kick plates by pulling them toward you see figure on the right Load the cabinets on a forklift or a crane fork from the front see section 5 3 1 Equipment for Transport page 24 Transport the cabinets to the installation site During transport be sure to follow all the instructions provided in section 5 3 Transporting the Sunny Central page 24 Place the Control and Interface Cabinet of the Sunny Central on the base The holes for the screws in the Sunny Central and the holes in the base must fit Install the Magnetics Cabinet with a clearance A EE of about 20 inches 508 mm D Open the Control Cabinet as described in section 10 1 Opening the Control Cabinet
33. e require the following information in order to provide you with the necessary assistance e Inverter type Type and number of modules connected e Communication method Serial number of the Sunny Central e Failure or warning number of the Sunny Central e Display of the Sunny Central SMA Solar Technology America LLC 4031 Alvis Court Rocklin CA 95677 Tel 1 916 625 0870 Tel 877 697 6283 Toll free available for USA Canada and Puerto Rico Fax 1 916 625 0871 Service SMA America com www SMA America com 72 SC250U 1US093413 Installation Guide SMA America LLC Appendix Celsius to Fahrenheit Conversion 15 Appendix Celsius to Fahrenheit Conversion The Sunny Central measures temperature in degree Celsius e g set external temperature for derating Conversion from Degrees Celsius to Degrees Fahrenheit e Formula F C 9 5 32 F Degrees Fahrenheit C Degrees Celsius e Example for 30 C F 30 9 5 32 F 54 32 F 86 F Conversion from Degrees Fahrenheit to Degrees Celsius e Formula C F 32 5 9 F Degrees Fahrenheit C Degrees Celsius e Example for 86 F C 86 32 5 9 C 54 5 9 C 50 C Diagram 80 O 60 e gt 5 40 Q 20 IL O 10 10 O 20 40 60 80 100 120 140 160 180 Temperature F Installation Guide SC250U IUS093413 73 Appendix Celsius to Fahrenheit Conversion SMA America LLC 74 SC
34. er of the Sunny Central A and the switch symbol B is closed m gesti PUE a i 1180 m 58 SC250U IUS0O93413 Installation Guide SMA America LLC Commissioning 9 3 Check the Ventilation In operation the Sunny Central is cooled by fans in case the temperature exceeds a defined threshold A B wA Position Nome mm A In the Magnetics Cabinet the air is sucked up from below in the front and In the Control Cabinet the air is sucked in from the top front and expelled at the bottom in the back Check the ventilation air flow using a sheet of paper 1 Hold the piece of paper in front of the air shafts 2 Check to see whether the sheet is blown away from or sucked toward the inverter 3 Compare the air circulation with what is described in this section Result 1 The Sunny Central sucks in air and blows it out as described in this section Commissioning has been successfully completed Result 2 The Sunny Central does not suck air in nor does it blow it out as described in this section 1 Shut down the Sunny Central 2 Contact SMA see Section 14 Contact page 72 Result 3 The Sunny Central does not suck air in nor does it blow it out at all 1 Check to see whether the Sunny Central is in operation 2 Ifthe Sunny Central is in operation shut it down 3 Contact SMA see section 14 Contact p
35. erica LLC CAUTION The transformers in the Magnetics Cabinet become hot during operation Danger of burn injury due to hot components e When working on the Sunny Central wear protective gloves 62 SC250U 1US093413 Installation Guide SMA America LLC Maintenance 11 Maintenance The Sunny Central inverter must be maintained at regular intervals Maintenance includes cleaning of cabinet interior if necessary The maintenance interval depends on the location and the ambient conditions 11 1 Sunny Central Maintenance Work Maintenance work Maintenance interval recommended The maintenance interval may need to be shortened depending on the location or ambient conditions 11 2 Replace DC fuse 1 Open the Interface Cabinet as described in section 10 2 Opening the Interface Cabinet page 61 The DC fuses are fastened with 2 screws each Bx 2 Remove the 2 screws of each DC fuse PL Remove the DC fuses Mount fuses vertically spacer 5 Attach the 2 screws of each DC fuse Tighten afterwards Use the torque of 44 ft lbs 60 Nm 7 Close the Interface Cabinet Installation Guide SC250U 1US093413 63 Parameter SMA America LLC 12 Parameter This section provides an overview of the parameters of the Sunny Central and their respective threshold values 12 1 Parameter Description The following table shows the parameters that are visible in the user a
36. eware of hot surface The product can become hot during operation Do not touch the product during operation Observe the operating instructions Read the product s documentation before working on it Follow all safety precautions and instructions as described in the documentation DC current Earth Ground D o AC current UL1741 is the standard applied by Underwriters Laboratories to the Sunny Central C US 250U to certify that it meets the requirements of the National Electrical Code and IEEE 929 2000 IEEE 929 2000 provides recommendations regarding the proper equipment and functionality necessary to ensure compatible operation when power generation is connected to the utility grid Installation Guide SC250U IUS093413 5 General Warnings SMA America LLC General Warnings i General Warnings All electrical installations must be done in accordance with the local and National Electrical Code ANSI NFPA 70 The Sunny Central 250U contains no user serviceable parts except for the fans on the bottom of the enclosure and the filters behind the fans as well as the handle covers on the sides of the unit For all repair and maintenance always return the unit to an authorized SMA Service Center Before installing or using the Sunny Central 250U read all of the instructions cautions and warnings on the Sunny Central 250U in this installation guide Before connecting the Sunny Central 250U to the electrical utility grid
37. face Cabinet right side Beware of hot surfaces 16 SC250U 1US093413 Installation Guide SMA America LLC The Sunny Central 3 4 Identifying the Sunny Central You can identify the Sunny Central using the type plate SMA SolarTechnolooy AG rr LETI see figure on the right The type plates are located inside of the Interface Cabinet and inside of the Magnetic www sma america com SUNNY CENTRAL C bi t Model Serial No a I n e XXXXXX XXXXXXXXXX B Fabrication Version XXX d Fabrication Date XX XXXX Max Continuous output Power o Operating voltage range Vac 3 Phase i Nominal Max Max continuous output current xxx xAac Output power factor Range of input operating voltage xxx xxx Vde MPPT Range of operating DC voltage xxx xxx Vde Max operating current xxx Adc The unit contains DC Ground and Fault Detector and Interruptor ENCLOSURE Type 3R IP54 For more details and for tightening torque allowable wire size and type see the Operator s Manual C e US LISTED Utility interactive inverter LISTED UL 1741 36AN Type description of the Sunny Central Bo Serial number of the Sunny Central Lun 3 5 Firmware The firmware of the Sunny Central and of the display are shown on the display of the Sunny Central The user manual of the Sunny Central describes how to obtain the firmware version Installation Guide SC250U
38. ge exceeds the value defined in ChkGdVigLo ChkGdVtgMax 288 Vrms 332 4 Vrms Maximum voltage for Sunny Central 332 4 Vrms operation If the voltage exceeds the value defined in ChkGdVtgMax the Sunny Central shuts down immediately ChkGdVtgMin 138 5 Vrms 138 5 Vrms Minimum voltage for Sunny Central 265 9 Vrms operation IF the voltage drops below the value defined at ChkGdVtgMin the Sunny Central shuts down immediately IChGnFgdo f iT Sunny Central operation with a ChkGnFrqloT gener IChkGnfrg Max f More information on parameter settings IChGnFgMin and operating the Sunny Central with a ChkGnvight generator can be obtained from SMA ChkGnViglo ChOnVgMex o ChkGnVigMin Cx Installation Guide SC250U 1US093413 65 Parameter SMA America LLC Parameter name Range Default Parameter Description FanHsCnt Resetting the hours of operation FanTrf1Cnt FanTrf2Cnt FanCab 1 Cnt FanCab2Cnt GDCtcCut PyCtcCnt Individual meters can be reset for example after having mounted a new fan FanHsCnt Deletes the total running time of the heatsink fan FanTrfl Cnt Deletes the total running time of the transformer fan 1 FanTrf2Cnt Deletes the total running time of the transformer fan 2 FanCab 1 Cnt Deletes the total running time of the interior fan 1 FanCab2Cnt Deletes the total running time of the interior fan 2 Parameter is displayed but is wit
39. he Sunny Central with doors open A door stay is located at the bottom of the Interface Cabinet Push the door stay A upwards to unlock 2 Close the door of the Interface Cabinet Close the Magnetics Cabinet 4 Turnon the automatic circuit breaker on the inside of the Control Cabinet s door 5 Turn the stop start switch on the inside of the Control Cabinet s door to the right until it reaches the start position 6 Shut the Control Cabinet door immediately 7 Push the handle down toward the Sunny Central When the handle has been pushed down the Sunny Central is closed Installation Guide SC250U 1US093413 57 Commissioning SMA America LLC 8 Turn the stop start switch on the Control Cabinet s door to the right until it reaches the start position 1 DANGER During operation high voltages are present in the Sunny Central The key left in the lock allows unauthorized personnel to open the Sunny Central Death resulting from burning and electric shock e Remove the keys from the locks of the door and from the lock of the stop start switch e Keep the key in a safe place 9 Switch on the fuses in the DC distribution boxes e g Sunny Central String Monitor 10 Remove the cover of the PV modules in the array 11 Switch on the circuit breaker 12 If there is enough radiation the DC and AC switches switch on audibly 13 The display shows the pow
40. hout function Dt yyyymmdd Current Date Here you can set the current date Ofs_E Total O kWh The Sunny Central s total energy yield 214748364 kWh The change of the Ofs_E Total parameter may be necessary when you exchange your Sunny Central and want to use the data from the old device Ofs_FanCab1Cnt O h 2147483 h Oh Total operating time of fan 1 in the Control Cabinet The change of the Ofs FanCab1Cnt parameter may be necessary if you exchange your Sunny Central and want to use the data from the old device 66 SC250U 1US093413 Installation Guide SMA America LLC Parameter Parameter name Range Default Parameter Description Ofs_FanHsCnt Oh 2147483 h Oh Total operating time of the heat sink fan in the Control Cabinet The change of the Ofs_FanHsCnt parameter may be necessary if you exchange your Sunny Central and want to use the data from the old device Oils Oh Ofs_FanTrf Cnt 2147483 h Total operating time of transformer fan 1 Ofs_FanTrf2Cnt 2147483 h The change of the Ofs_FanTrf Cnt parameter may be necessary if you exchange your Sunny Central and want to use the data from the old device Total operating time of transformer fan 2 The change of the Ofs_FanTrf2Cnt parameter may be necessary if you exchange your Sunny Central and want to use the data from the old device Oh The Sunny Central s total number of hours of operation The change of the Ofs_h_On parameter may be necessary when you e
41. ied deba e aei pr tont 22 Preparation of the Base 23 Position of the Mounting Holes sas rti RE REP ewe xa aed 23 Installation Guide SC250U 1US093413 7 Table of Contents SMA America LLC S22 5 23 9 9 Sd 5 3 2 5 4 5 4 1 5 4 2 5 4 3 5 4 4 5 4 5 5 4 6 5 4 7 5 4 8 5 4 9 6 1 6 2 7 1 7 2 Fekal 133 7 9 1 159 2 7 3 3 7 3 4 7 3 5 8 Size of the Mounting Holes esses alri 23 Drilling Holes into the BOSE sucus e Dario eren o HUE RI Ed 23 Transporting the Sunny Central 0 00000 cee eee 24 Equipment tor Transport 3 5 o Hudesde st EUER RESORT ERR bain ates 24 Center of Gravity of the Sunny Central 25 Installing the Sunny Central 25 Removing the Kick Plates from the Sunny Central 25 Inserting the Cables into the Cabinets LL 27 Connect the Cables in the Magnetics Cabinet 28 Connecting the Cables in the Control Cabinet 000000005 30 Attach the Sunny Central to the base 0 6 eee 31 Install the Cover Between the Cabinets 000 cee eee eee 31 Install Veniilalon Pales doa bush pd au 33 Attaching the Kick Plates to the Sunny Central 34 Remove Transport Locks 34 Attaching the Conduits cece eee ee aces 35 Insert Cables from the right into the Sunny Central 35 Insert Cables from below into the Sunny Central 36 Connecting Optional Communication Devices 38 Position of the Commu
42. nd installer levels Grayed out parameters are only displayed in installer mode Parameter name Range Default Parameter Description Ackn Ackowledge an error manually An error can be acknowledged remotely See the Sunny Central s user manual CardFunc ForcedWrite Saving ring memory with errors and StoEvtHis events on SD card StoFailHis ChkGdFrqLo 57 59 8 Hz 59 3 Hz Minimum frequency for Sunny Central ChkGdFrqLoT 160 ms 300000 160 ms operation ms If the frequency drops below the value given in ChkGdFrqLo the Sunny Central will shut down after the time period given in ChkGdFrqLoT ChkGdFrqMax 60 5 Hz Maximum frequency for Sunny Central operation If the frequency exceeds the value given in ChkGdFrqMax the Sunny Central shuts down immediately ChkGdFrqMin 57 Hz 59 8 Hz 57 Hz Minimum frequency for Sunny Central operation If the frequency drops below the value given in ChkGdFrqMin the Sunny Central shuts down immediately ChkGdVigHi 288 Vrms 304 7 Vrms Maximum voltage for Sunny Central 321 3 Vrms operation The Sunny Central shuts down within 1 second in case the voltage exceeds the value defined in ChkGdVtgHi 64 SC250U 1US093413 Installation Guide SMA America LLC Parameter Parameter name Range Default Parameter Description ChkGdViglo 149 6 Vrms 243 8 Vrms Minimum voltage for Sunny Central 265 9 Vrms operation The Sunny Central shuts down within 2 seconds in case the volta
43. nd two transport locks are located on the front of the top choke block Each transport lock is attached using a total of four screws Right figure position of the transport locks A 1 Loosen the screws of the transport locks 2 Remove the screws and the transport locks 3 Close the Sunny Central 34 SC250U 1US093413 Installation Guide SMA America LLC Attaching the Conduits 6 Attaching the Conduits In this section you will learn where to insert the cables in the Sunny Central and where to punch the holes for the conduits NOTICE Moisture can seep through incorrect conduits and conduit hubs Damage to the electronics of the Sunny Central e For conduit hubs use only UL Listed rainproof or wet location hubs complying with UL 514B for entry into the enclosure e Adjust the diameter of the conduit hubs to match the diameter of the conduits The PV panel cables the AC cables and the communication cables can be routed into the Sunny Central s Interface Cabinet from the right or from below The two options are described below 6 1 Insert Cables from the right into the Sunny Central Insert the PV generator cables the AC cables and the data cables into the Sunny Central from the right A metal sheet is attached to the Sunny Central for this purpose 1 Removethe plate screws 2 Put the screws and washers aside 3 Remove plate m P
44. nded DC connection in figure above DC connection Ungrounded DC connection in figure above DC connection b Greundcomedion 46 SC250U 1US093413 Installation Guide SMA America LLC Electrical Connection 8 2 PE Connection AC Connection Number of AC Cables Cable Size 3 0 AWG 600 kcmil 500 in lbs 56 Nm 85 mm 304 mm PV Modules Sunny Central with 4 DC Fuses Number of DC Strings Cable Size 300 kcmil 152 mm All 194 F 90 C copper wire NE RENE 2 0 AWG 67 mm 315 in lbs 35 Nm tightening torque Sunny Central with 6 DC Fuses Number of DC Strings Cable Size DENEN e 4 0 AWG 107 mm All 194 F 90 C copper wire 2 AWG 33 mm 315 in lbs 35 Nm tightening torque The illustration below shows a Sunny Central which is equipped for connection to 6 or 12 DC strings Poston Nom terminals Re _r grounding the AC cables Position Interface Cabinet bottom left Open the Sunny Central as described in section 10 2 Opening the Interface Cabinet page 61 Strip the cable by about 1 2 in 30 mm ina Open the screw terminal completely 30 mm Plug the copper inner conductor of the cable into the screw terminal Installation Guide SC250U 1US093413 47 Electrical Connection SMA America LLC 5 Tighten the screw terminal using an Allen key For required torque see tables above Connect all grounding cables of the modules as described above
45. nication Devices 39 Connecting the Sunny SensorBox optional 39 Connecting the Data Cable of the Sunny SensorBox 40 Sunny WebBox optional A Installing the WebBox in the Sunny Central 42 Connecting the Sunny WebBox to the Sunny Central 43 Connecting the Cable to the Sunny WebBox 000 eee eee 43 ISU RESET TL LE PRETI POSATI TR SIT 43 Change Display SeninGs ux ao artt a ecu o RB EDU ade 44 Electrical Connechioni s arianna nina 45 CONNEGIONAIO s an ire paid Ravn aden Ge 46 C250U IUS093413 Installation Guide SMA America LLC 8 2 8 3 8 3 1 8 3 2 8 3 3 8 3 4 8 4 8 4 1 9 9 1 9 2 93 10 10 1 10 2 10 3 11 11 1 11 2 12 12 1 12 2 13 13 1 14 15 PE Connecloiisx x randa ba 47 Connection of the PV Modules sese 48 PV Modules DC Connection Negative Grounding 49 PV Modules DC Connection Negative Grounding 50 PV Modules DC Connection Positive Grounding 51 PV Modules DC Connection Positive Grounding 52 AC CoONBSGIOTIu ss eatem itg n lennon 29 Connecting AC wires to the Sunny Central 54 CommlissiohlhB void e ein 56 Visual Inspection of the Sunny Central 56 Switching the Sunny Central On 57 Check the Ventilation LL 59 Opening the Sunny Central 60 Opening the Control Cabinet 0 000
46. ntral is a PV inverter that converts the DC energy from PV modules to AC energy This energy is fed to the public grid afterwards The Sunny Central 250U is designed for indoor and outdoor installation Principle of a PV Power System with a Sunny Central rega XS SST Ks iN m va OSs i SN cdd Bo DC distribution with DC fuses e g Sunny Central String Monitor b sumy Cen E Che p e SSS 12 SC250U 1US093413 Installation Guide SMA America LLC Safety Any other application of the Sunny Central or installation of components and modifications which are not explicitly allowed endanger the safety and void the warranty as well as the operation permit It is prohibited to use the Sunny central for purposes other than those described here It is prohibited to connect voltage sources to the Sunny Central other than those consisting of PV modules It is prohibited to modify the Sunny Central or to install components that are not explicitly recommended by SMA or sold by SMA for this purpose 2 2 Safety Instructions 1 DANGER High voltages are present in the live components of the low voltage grid Death resulting from burning and electric shock Do not touch the live components of the Sunny Central or low voltage grid e Pay close attention to all safety precaution measures regarding the low voltage grid 1 DANGER During operation high voltages are present in the Sunny Central Death
47. o the screw terminal 4 Tighten the screw terminal using an Allen key The required torque is 315 in lbs 35 Nm 5 Connect all DC cables of the PV modules as described above 52 SC250U 1US093413 Installation Guide SMA America LLC Electrical Connection 8 4 AC Connection 1 DANGER High voltages are present in the live components of the low voltage grid Death resulting from burning and electric shock e Pay close attention to all safety precaution measures regarding the low voltage grid e Switch off the AC circuit breaker and secure it against accidental switching on e Ensure that no voltage is present CAUTION Improper connection to the public grid may cause a fire Burns from fire To reduce the risk of fire connect only to a circuit provided with 450 A maximum branch circuit overcurrent protection in accordance with the National Electrical Code ANSI NFPA 70 e To reduce the risk of fire do not connect to an AC load center circuit breaker panel having multiwire branch circuits connected Overcurrent protection for the AC output circuit has to be provided by others The AC output circuits are isolated from the enclosure The system grounding if required by Section 250 of the National Electrical Code ANSI NFPA 70 is the responsibility of the installer Technical Data for the AC Connection AC connection cable A B C N and PE Nominal AC voltage 480 Vac 3007 4 Installation
48. protrude from the cabinets Tip IF a ventilation plate gets stuck when pushing it into the Sunny Central hold it from the bottom and press the middle area upwards while pushing it in Moisture that may have seeped in can be removed via the condensate drain in the base of the Control Cabinet Install the condensate drain as described here Figure to the right Layout of the condensate drain in the base of the Control Cabinet op cover of the condensate drain Base and ventilation plate of the Control Cabinet Installation Guide SC250U 1US093413 24 Transport and Installation SMA America LLC C B ottom cover of the condensate drain p E Insert the top cover of the condensate drain into the hole in the base of the Control Cabinet 2 Connect the bottom cover of the condensate drain with the top cover of the condensate drain from the bottom through the ventilation plate 3 Use the screw to secure the covers of the condensate drain 5 4 8 Attaching the Kick Plates to the Sunny Central l Attach the kick plates to front and back of the Sunny Central a 2 Tighten the screws on the kick plates with a torx screwdriver 5 4 9 Remove Transport Locks The transformer and choke in the Magnetics Cabinet are secured for transport with transport locks A on the cabinet A transport lock is located on both the right and left side of the bottom transformer block a
49. r energy provider 3 2 The Sunny Central s Design The Sunny Central is divided into three sections AA LISA A Magnetics Cabinet The Sunny Central s transformer is contained in the Magnetics Cabinet Control Cabinet The Control Cabinet contains the system control the Sunny Display the stop start switch and the power units for converting direct current to alternating current Interface Cabinet All AC DC and data cables are connected in the Interface Cabinet see also Section 8 1 Connection Area page 46 Installation Guide SC250U 1US093413 15 The Sunny Central SMA America LLC 3 3 Location of the Safety Notices The figure to the right shows the location of the safety A B B notices on the Sunny Central af erro Position O A Magnetics Cabinet wall IEEE ERI Control Cabinet door and Interface Cabinet door a Open Magnetics Cabinet capacitor C IEEE Warning regarding high voltages Capacitor and plate are not grounded Open Magnetices Cabinet AEN Beware of hot surfaces Open Interface Cabinet left side EE AREE Open Inter
50. resulting from electric shock e Do not operate the Sunny Central with doors open Before commencing work on the Sunny Central Disconnect completely Ensure that the device cannot be reconnected Ensure that no voltage is present Ground and short circuit Cover any nearby live parts 1 DANGER Normally grounded conductors may be ungrounded and energized when a ground fault is indicated Risk of electric shock e Test before touching e Work on the Sunny Central must be carried out by qualified personnel Installation Guide SC250U 1US093413 13 Safety SMA America LLC WARNING Failure to follow the manual the operating instructions and the safety precautions may lead to severe injury from electric shock All work on the Sunny Central shall only be done as described in this manual Pay attention to all safety instructions Follow all operating instructions If problems occur when performing the work described here contact SMA WARNING Operating a damaged Sunny Central may cause severe injury from electric shock The Sunny Central shall only be used if it is technically faultless and safe to operate e Operate the Sunny Central only if there are no visible damages e Regularly check the Sunny Central for visible damage Ensure that all safety features are accessible at all times and that their correct operation is tested regularly CAUTION Cuts and scratches due to sharp edges inside the Sunny Central
51. stallation in the base of the Sunny Central E Condensate drain Een Guide User Manual Circuit Diagram Test Report Commissioning Report IG Abrasive webs K juseped pla 4 3 Storage NOTICE Improper storage can cause moisture to seep into the Sunny Central Damage to the Sunny Central possible e The Sunny Central must be closed during storage e If stored for 6 months or longer make sure the storage area is dry Installation Guide SC250U 1US093413 19 Transport and Installation SMA America LLC 5 Transport and Installation This section explains how to find the best installation site for your Sunny Central It provides step by step instructions on how to transport and install the Sunny Central and connect the cabinets with each other electrically Observe all safety precautions in this section to avoid material and personal damages 5 1 Choosing the Installation Site 5 1 1 Dimensions and Weight The Sunny Central has a total weight of 4 200 lbs 1905 kg The left cabinet Magnetics Cabinet of the Sunny Central weighs 2 710 lbs 1230 kg and the right cabinet Control and Interface Cabinet weighs 1 490 lbs 675 kg 79 8 in 2027 mm 5 1 2 Ambient Conditions e The installation location must be accessible at all times e The ambient temperature must be between 13 F and 122 F 25 C and 50 C Direct solar irradiation reduces the output power of
52. t and Installation 5 2 Preparation of the Base The inverter must be secured to the foundation per local building codes At the bottom of the Sunny Central there are 12 mounting holes for anchoring it to its base 5 2 1 Position of the Mounting Holes 90 7 in 16 5 in 2304 mm 419 mm 25 8 in 655 mm 27 1 in 688 mm 35 3 in 10 6 in 31 3 in 4 2 in 23 4 in 897 mm 269 mm 795 mm 106 7 mm 594 mm 5 2 2 Size of the Mounting Holes Al UN 0 5 in NC d 12 7 mm lt gt 1 4 in 35 5 mm 5 2 3 Drilling Holes into the Base 1 DANGER Drilling into live wires Death resulting from electric shock e Check the installation location for electric cables laid in the base 1 Measure the distances for the holes Mark the positions of the holes Drill the holes into the base on marked positions pe 9 P9 Put dowels into the drill holes Installation Guide SC250U IUSO93413 23 Transport and Installation SMA America LLC 5 3 Transporting the Sunny Central Remove the kick plates before transporting the Sunny Central see section 5 4 1 Removing the Kick Plates from the Sunny Central page 25 WARNING Sunny Central may tip over if improperly transported Bruises and fractures possible Pay attention to the center of gravity of the Sunny Central see section 5 3 2 Center of Gravity of the Sunny Central page 25 Transport the Sunny Central
53. the three phases of the AC connection in the Sunny Central The indicator shows you whether there is clockwise phase sequence Installation Guide SC250U 1US093413 55 Commissioning SMA America LLC 9 Commissioning This Section explains step by step how to put the Sunny Central into operation and how you can determine that the commissioning was successful 1 DANGER Electric shock due to improper startup of the Sunny Central Death resulting from burning and electric shock e All procedures described in this Section shall only be conducted by qualified personnel e f problems occur when performing the work described here contact SMA Application to Energy Supply Company Before you commission the Sunny Central inform the relevant energy provider You must submit the following information e Date of commissioning e Technical data of the plant 9 1 Visual Inspection of the Sunny Central Ensure that all AC and DC voltages are not connected to the inverter Wait 15 minutes for all internal power supplies to discharge Check voltage in order to ensure that all voltages have been removed pe gt DIS Inspect all large power cables and bus connections throughout the inverter to verify that they are tight Verify that all PV wires are connected with the proper polarity Verify that all PV wires are tightened to the proper torque specification
54. tween the Cabinets The cover between the two cabinets is attached using a total of 12 screws 4 screws on the front 4 screws on the back and 4 screws on the top of the cover A bolt is available on the inside This bolt is used in order to ground the cover Installation Guide SC250U 1US093413 31 Transport and Installation 1 Placethe cover between the Magnetics Cabinet and the Control Cabinet The bolt must be in the front side of the Sunny Central 2 Connect the grounding cable with the bolt Fasten tightly with the provided nut 3 Tighten all 12 screws with a torx screwdriver 32 SC250U 1US093413 SMA America LLC Installation Guide SMA America LLC Transport and Installation 5 4 7 Install Ventilation Plates Rails for installing the ventilation plates are located on the stands of the Magnetics Cabinet and the Control Cabinet Figure to the right Rail in the front left stand of the Magnetics Cabinet 1 Placethe ventilation plate with two grilles A onto the rails in the Magnetics Cabinet and push into the Sunny Central The grilles in the ventilation plate must be on the right and left N 2 Place the ventilation plate with one grille B onto the rails in the Control Cabinet and push into the K Sunny Central The grille in the ventilation plate Ld must be in the back OO 1 If properly installed the ventilation plates should B not
55. unny Central can be equipped with different communication devices This section explains how the communication devices in the Sunny Central are connected Section 8 Electrical Connection This section describes how the Sunny Central is connected to the grid and to the PV modules and what precautions must be observed in order to avoid material and personal damages It provides information on the necessary cable sizes and the magnitude of the torque for the cable connection Section 9 Commissioning This section explains step by step how to put the Sunny Central into operation and how you can determine that the commissioning was successful Section 10 Opening the Sunny Central This section describes how to open the Sunny Central and what precautions must be observed in order to avoid personal damages Section 11 Parameter This section provides an overview of the parameters of the Sunny Central and their respective threshold values Section 12 Technical Data In this section you will find the technical data for the Sunny Central s operation the norms to which it conforms and the required cables and torques Installation Guide SC250U 1US093413 11 Safety SMA America LLC 2 Safety In this section you will find general safety directions which you must observe throughout the entire installation process Pay special attention to this section so as to avoid personal and material damages 2 1 Appropriate Usage The Sunny Ce
56. xchange your Sunny Central and want to use the data from the old device Ola Ofs_h_On Oh 2147483 h Ofs_h_Total Oh 2147483 h ParaLod cl Sci2s Factory Plimit O kW 1000 kW 250 kW Upper limit for AC output power This parameter cannot be changed Total number of operational hours with grid feeding The change of the Ofs_h_Total parameter may be necessary when you exchange your Sunny Central and want to use the data from the old device Loading parameters from SD card Factory Factory parameter settings are being loaded Saving parameter on SD card Installation Guide SC250U 1US093413 67 Parameter SMA America LLC Parameter name Range Default Parameter Description Pmax O kW 250kW 250 kW Output limit of the Sunny Central Changing the parameter can reduce the output power of the Sunny Central PVPwrMinTr O kW 1200 kW 10 kW MPP tracking PVPwrMinTrT 1s 1800s 600 s If the output exceeds the value PVPwrMinTr the Sunny Central will wait for a period of time set in PVPwrMinTrT before it begins to seek the Maximum Power Point PVStrT 1s 1800s Initial voltage of the Sunny Central PVVtgStr OV 1200 V 390 V If the voltage increases over the value set at PVVigStr the Sunny Central will start after waiting for a period of time set at PVStrT Serial Number Serial number of the Sunny Central This parameter cannot be changed SpntGnMod Sunny Central operation with a SpntGnPwrMin generator
57. xt line reads SETTINGS Press knob once The Sunny Display changes to the SETTINGS menu Turn the knob until the text line reads OPERATION MODE 5 Press knob once The Sunny Display changes to the OPERATION MODE menu The display shows the current operation mode 6 Turn the knob until the text line reads OP MODE WEBBOX Press knob once The display shows e g current time and date of the Sunny WebBox 8 Turn off the Sunny Central as described in section 10 Opening the Sunny Central page 60 and turn it on again For more information concerning the operation of the Sunny Display please refer to the Sunny Central s user manual 44 SC250U 1US093413 Installation Guide SMA America LLC Electrical Connection 8 Electrical Connection This section describes how the Sunny Central is connected to the grid and to the combiner boxes and what precautions must be observed in order to avoid material and personal damages It provides information on the necessary cable sizes and the magnitude of the torque for the cable connection 1 DANGER Normally grounded conductors may be ungrounded and energized when a ground fault is indicated Risk of electric shock e Test before touching Work on the Sunny Central must be carried out by qualified personnel NOTICE The components in the Sunny Central can be damaged by electrostatic discharge When working on the Sunny Central and when handling the components observe all
58. y to be found on your switch router PC or Laptop If this is not the case please refer to the switch router PC or Laptop manual 1 Route the cables separately from AC and DC cables Draw the cable into the Sunny Central see section 6 Attaching the Conduits page 35 2 Plug the cable into the Sunny WebBox s socket Plug the cable into the socket of the switch router PC or Laptop Close the Interface Cabinet of the Sunny Central 7 3 4 Termination To ensure sufficient signal quality of the RS485 data bus it must be terminated on both ends The Sunny WebBox is located at one of the end points of the RS485 data bus e Mount jumper to J1A The jumper is mounted upon delivery Signal biasing jumper J1B and jumper J1C To ensure sufficient signal quality of the RS485 communication bus a bias must be connected to the WebBox e Connect jumper to J1B and JIC Both jumpers are mounted upon delivery Installation Guide SC250U 1US093413 43 Connecting Optional Communication Devices SMA America LLC 7 3 5 Change Display Settings The Sunny Central is shipped with a Sunny Display by default ere A i O a b eq A eb w o C The operating mode of the Sunny Display must be changed in order to additionally refit a Sunny WebBox Proceed as follows Hold the knob and the button down for 5 seconds Turn the knob until the te

SUNNY CENTRAL 250U - Installation Guide

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