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Installation Manual

1. Of o 0 e C 00 00 00 00 00 00 O Jolo ojo 0 0 eo Ww 00 00 00 00 00 00 00 oa o ol e e lo l o 6 N Base AC connection DC connection DC connection I OO FP gt Ground connection Installation Guide SC250U IUS084912 49 Electrical Connection SMA Solar Technology AG 8 2 PE Connection AC Connection Number of AC Cables Cable Size 3 0 AWG 600 kcmil 500 inlbs Solar Modules Sunny Central with 4 DC Fuses es 300 kcmil All 194 F 90 C copper wire Pi 2 0 AWG 315 in lbs tightening torque Sunny Central with 6 DC Fuses Lea taki PB 4 0 AWG All 194 F 90 C copper wire 2 AWG 315 in lbs tightening torque The illustrations below show a Sunny Central which is equipped for connection to 6 or 12 DC strings A Screw terminals for grounding the AC cables Position Interface Cabinet bottom left 1 Open the
2. Installation Guide SMA Solar Technology AG 3 4 Identifying the Sunny Central You can identify the Sunny Central using the type plate see figure at right The type plate is on the inside of the Interface Cabinet A Type description of the Sunny Central B Serial number of the Sunny Central C Date of manufacture 3 5 Firmware The Sunny Central s firmware and that of the display are shown on the display of the Sunny Central The Sunny Central s user manual describes how to obtain the firmware version Installation Guide The Sunny Central SMA Solar Technology AG fe www sma america com Dc SUNNY CENTRAL Model Serial No SC250U 1200 lt B Date of manufacture 11 2007 lt C Max Continuous output Power 250kWac Operating voltage range Vac 3 Phase Min Nominal Ma Operating frequency range Hz x 422 480 522 Min Nominal Max 59 3 60 0 60 5 Max continuous output current 300 7Aac Output power factor 0 99 Range of input operating voltage 290 MPPT Range of operating DC voltage 290 480 Vdc Max operating current 800 Adc The unit contains DC Ground and Fault Detector and Interruptor 600 Vdc ENCLOSURE Type 3R IP54 F
3. 8 Insert the plugs into the socket on the bottom of the Sunny Sensor 485Hub 9 Close the Sunny Central 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 42 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG 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 FastEthernet 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 If the Sunny WebBox is permanently integrated into a network with Internet access it can automatically transmit the data of your solar system to Sunny Portal A ii ma i A Switch or router Data cable The data cabl
4. SC250U IUS0849 12 31 Transport and Installation 32 Place the cable gland on the opening Attach and tighten the four nuts Connect the ground cable to the bolt in the Magnetics Cabinet and tighten it with a torque wrench to 230 in Ibs SC250U IUS084912 SMA Solar Technology AG Installation Guide SMA Solar Technology AG Transport and Installation 5 4 5 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 aluminum rails under the power units in the control cabinet Figure to the right Layout for connecting a cable lug to the tin plated copper rail in the Control Cabinet A Nut B Lock washer C Cable lug D tin plated copper rail E Screwhead 1 Clean the contact surfaces prior to connection see section 5 4 3 Clean the Contact Surfaces for Cable Connection Page 30 2 Connect cable W50 and W 50 1 to tin plated copper rail U 3 Connect cable W51 and W 51 1 to tin plated copper rail V 4 Connect cable W52 and W 52 1 to tin plated copper rail W 5 Tighten all terminal connection bolts with a torque wrench to 230 in lbs 5 4 6 Attach the Sunny Central to the base The mounting holes
5. G S7 lt 7 Magnetics Cabinet Interface and Control Cabinet Cover for the cables between the cabinets of the Sunny Central and screws Ventilation plates with air filters for installation in the base of the Sunny Central Condensate drain Installation Guide User Manual Circuit Diagram Test Report Abrasive webs I QO 171 mo QA FP gt Torx screwdriver Sealing splints U shaped plate 4 3 Storage NOTICE Improper storage can cause moisture to seep into the Sunny Central Damage to the Sunny Central 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 IUS084912 21 Transport and Installation SMA Solar Technology AG 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 5 1 Choosing the Installation Site 5 1 1 Dimensions and weight The Sunny Central has a total weight of 4 200 Ibs The left cabinet Magnetics Cabinet of the Sunny Central weighs 2 710 lbs and the right cabinet Control and Interface Cabinet weighs 1 490 lbs 5 1 2 Ambient Conditions The installation location mu
6. 5 4 9 Attaching the Plinth Plates to the Sunny Central 1 Attach the plinth panels to front and back of the Sunny Central 2 Tighten the screws on the plinth panels with a torx screwdriver 5 4 10 Remove Transport Locks The transformer and choke in the magnetics cabinet are A 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 and 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 36 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG 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 moisture 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 Adjust the diameter of the conduit hubs to match the diameter of the conduits The PV panel cables
7. The Sunny Central is divided into three sections C A Magnetics Cabinet The Sunny Central s transformer is contained in the Magnetics Cabinet B 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 C Interface Cabinet All AC DC and data cables are connected in the interface cabinet see also Section 8 1 Connection Area Page 48 Installation Guide SC250U 1US084912 17 The Sunny Central 3 3 Location of the Safety Notices The figure to the right shows the location of the safety notices on the Sunny Central A Magnetics Cabinet door General Warnings Control Cabinet door and Interface Cabinet door Warning regarding high voltages in the Sunny Central Open Magnetics Cabinet capacitor Warning regarding high voltages Capacitor and plate are not grounded Open Magnetices Cabinet Beware of hot surfaces Open Interface Cabinet left side Type plate Open Interface Cabinet right side Beware of hot surfaces SC250U IUS0849 12 SMA Solar Technology AG
8. 1 Place the ventilation plate with two grilles A onto the rails in the magnetics cabinet and push into the Sunny o Central The grilles in the ventilation plate must be on T the right and left 2 Place the ventilation plate with one grille B onto the rails in the control cabinet and push into the Sunny _ I si Central The grille in the ventilation plate must be in the PT back KA ra If properly installed the ventilation plates should not B 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 A condensate drain in the base of the control cabinet Install the Pa B condensate drain as described here Figure to the right Layout of the condensate drain in the base of the Control Cabinet A Top cover of the condensate drain B Base and ventilation plate of the Control Cabinet C Bottom cover of the condensate drain D Screw 1 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 Installation Guide SC250U IUS084912 35 Transport and Installation SMA Solar Technology AG
9. 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 1 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 25 2 Tighten screws Installation Guide SC250U IUS084912 33 Transport and Installation SMA Solar Technology AG 5 4 7 Install the Cover Between 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 1 Place the cover between the Magnetics Cabinet and the Control Cabinet The bolt must be in the front side of the Sunny Cental 2 Connect the grounding cable with the bolt Fasten tightly with the provided nut 3 Tighten all 12 screws with a torx screwdriver 34 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Transport and Installation 5 4 8 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
10. 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 ESD safety regulations Discharge electrostatic charge by touching the grounded Sunny Central enclosure Only then is it safe to touch any electronic components il 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 16 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG The Sunny Central 3 The Sunny Central In this section you will see how one can 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 solar modules convert a portion of sunlight into electrical energy direct current The Sunny Central then converts the direct current into alternating current and feeds it into the public grid This current can be used directly or it can be sold to your energy provider 3 2 The Sunny Central s Design
11. 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 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 NOTICE Seeping moisture during installation of the Sunny Central Damage to the electronics of the Sunny Central e Do not open 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 40 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG 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 A Sunny Sensor 485Hub see section 7 2 Connecting the Sunny SensorBox optional Page 41 B Sunny WebBox see section 7 3 Sunny WebBox optional Page 43 7 2 Connecting the Sunny SensorBox optional This Section describes how to connect the Sunny SensorBox
12. 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 A DANGER During operation high voltages are present in the Sunny Central Death resulting from electric shock e Do not operate the Sunny Central with doors open Below on the door of the Interface Cabinet there is a A door stay A 1 To unlock the door stay A push upwards 2 Close the door of the Interface Cabinet 3 Close the Magnetics Cabinet 4 Turnonthe 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 Installation Guide SC250U IUS0849 12 59 Commissioning SMA Solar Technology AG 7 Push the handle down toward the Sunny Central When the handle has been pushed down the Sunny Central is closed 8 Turn the stop start switch on the Control Cabinet s door to the right until it reaches the start position A DANGER During operation high voltages are present in the Sunny Central The key left in the lock allows unauthorized personnel to open
13. 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 Shut down the Sunny Central Contact SMA America see Section 13 Contact Page 75 Result 3 The Sunny Central does not suck air in nor does it blow it out at all Check to see whether the Sunny Central is in operation Ifthe Sunny Central is in operation shut it down Contact SMA America see section 13 Contact Page 75 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Opening the Sunny Central 10 Opening the Sunny Central A DANGER Electric shock due to improper opening of the Sunny Central Death resulting from burning and electric shock All procedures described in this Section shall only be conducted by qualified personnel Observe the sequence described here when opening the Sunny Central If problems occur when performing the work described here contact SMA America 10 1 Opening the Control Cabinet l 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 When the Sunny Central is disconnected the display turns off Cover the solar modules Switch
14. off the fuses in the DC distribution boxes e g Sunny String Monitor and secure them against reconnection Wait 5 minutes When the Sunny Central is switched off voltage will remain in the internal capacitors for another 5 minutes The Sunny Central is deactivated and can be opened Put the key into the Control Cabinet s lock and open it The handle flips up Installation Guide SC250U 1US084912 63 Opening the Sunny Central SMA Solar Technology AG 8 Q Grasp the handle from below and pull it up The door s catch is released and the door can be opened Open the door 10 2 Opening the Interface Cabinet l 64 Switch off the Sunny Central as described in section 10 1 Opening the Control Cabinet Page 63 Put the key into the Interface Cabinet s lock and open it The handle flips up Grasp the handle from below and pull it up The door s catch is released and the door can be opened 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 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 Verify the absence of voltage with respect to ground at the DC clamp with an appropriate mete
15. 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 Keep the key in a safe place 9 Switch on the fuses in the DC distribution boxes e g Sunny String Monitor 10 Remove the cover of the solar modules in the array 11 Switch on the circuit breaker 12 If there is enough radiation the DC and AC switches switch on audibly 60 SC250U IUS084912 Installation Guide SMA Solar Technology AG Commissioning 13 The display shows the power of the Sunny Central A and the switch symbol B is closed 9 3 Check the Ventilation In operation the Sunny Central is cooled by fans in case the temperature exceeds a defined threshold A In the Magnetics Cabinet the air is sucked up from below in the front and expelled at the top in the back and front of the Sunny Central B In the Control Cabinet the air is sucked in from the top front and expelled at the bottom in the back fr Installation Guide SC250U 1US084912 61 Commissioning SMA Solar Technology AG Check the ventilation air flow using a sheet of paper l 62 Hold the piece of paper in front of the air shafts Check to see whether the sheet is blown away from or sucked toward the inverter Compare the air circulation with what is described in this section Result 1 The Sunny Central sucks in air and blows
16. 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 Use cables with a section of 2 x 2 x AWG 24 shielded twisted pair cables i Data Cable Recommendation SMA also provides data cables Please contact your electrician or wholesaler Installation Guide SC250U IUS084912 41 Connecting Optional Communication Devices SMA Solar Technology AG 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 64 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 37 3 Remove the insulation of the data cable 2 Ain by approx 2 4 in and uncover the shield Uncover the wires about 1 8 in 5 Strip the wires about 0 2 in 6 Connectthe wires to the connector as shown in the RE figure on the right OA4 A Se See ae E A Sunny Sensor 485Hub socket 5 i i o B Plug C Sunny SensorBox ee 7 Note down the wire color 4 9 V Ha End 04 o re AD
17. 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 one can 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 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 Installation Guide SC250U IUS084912 11 Notes on this Manual SMA Solar Technology AG Section 7 Connecting the Sunny WebBox The Sunny Central can be equipped with different communication devices This section explains how the communication devices in the Su
18. 00000 ms 160 ms oR 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 64 5 Hz 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 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 ChkGdVtgHi 288 321 3 Vrms 304 7 Vrms Maximum voltage for Sunny Central operation The Sunny Central shuts down within 1 second in case the voltage exceeds the value defined in ChkGdVtgHi 66 SC250U IUSO849 12 Installation Guide SMA Solar Technology AG Parameter name ChkGdViglo ChkGdVtgMax ChkGdVtgMin ChkGnFrqlo ChkGnFrqLoT ChkGnFrqMax ChkGnFrqMin ChkGnVtgMax ChkGnVtgMin CtlExtPwrKi Installation Guide 149 6 265 9 Vrms Minimum voltage for Sunny Central operation The Sunny Central shuts down within 2 seconds in case the voltage exceeds the value defined in ChkGdVtgLo 288 332 4 Vrms 332 4 Vrms Maximum voltage for Sunny Central operation Ifthe voltage exceeds the value defined in ChkGdVtgMax the Sunny Central shuts down immediately 138 5 2659 Hz 138 5 Hz Minimum voltage for Sunny Central operation If the voltage drops below the value defined at ChkGdVtgMin the
19. 990 MOBO Control Cabinet into the Magnetics Cabinet figure to the right position K M ARESE agnetics Cabine A OOO DOCO 5 Place the Magnetics Cabinet to the desired location of the base The holes for the screws in the Sunny Central and the holes in the base must fit 6 Pull all the cables into the Magnetics Cabinet as far as they will go E 7 Tighten the PG cable glands in the control cabinet in a clockwise direction Installation Guide SC250U 1US084912 29 Transport and Installation SMA Solar Technology AG 5 4 3 Clean the Contact Surfaces for Cable Connection Insert a copper aluminum washer between the cable lug of the cable and the aluminum rail The copper aluminum washer consists of an aluminum layer and a copper layer The conductance quality would decrease over time if the copper aluminum washer were not used A Cable lug B Copper aluminum washer The copper colored side of the copper aluminum washer touches the cable lug The silver colored side of C the copper aluminum washer touches the aluminum rail C Aluminum rail 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 Before connecting the cables clean the contact surfaces as described below Use separate abrasive webs to clean th
20. AG Electrical Connection 8 4 1 AC Connection A B C N The AC cables are connected to the screw terminals A in the middle of the Interface Cabinet to the left 1 Strip the cable by about 1 2 in 2 Open the screw terminal completely 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 5 Connect all AC grid cables as described above Installation Guide SC250U IUS084912 57 Commissioning SMA Solar Technology AG 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 A 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 If problems occur when performing the work described here contact SMA America il 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 th
21. Cabinet 64 Opening the Magnetics Cabinet 65 Paramete oeer ebree 66 Parameter Describiuse sr cerniere lei 66 Changing Paramelers ssesscnina sata nE E RENTENE ati 70 Technical Datd ao4gs sara aerea 71 Measurement ACCUrTACY cirsrsiiiiha ed hehe uenkee bad 73 Torques and Cable Sizes 0 0 1 sae err eae bid eee werk 74 Conlacdl agnia tie earlier eee 75 Appendix Celsius to Fahrenheit conversion 76 Installation Guide SC250U IUS0849 12 9 10 SC250U IUS0849 12 SMA Solar Technology AG Installation Guide SMA Solar Technology AG Notes on this Manual 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 solar modules Information concerning the solar modules is available from the manufacturer of the solar 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 01 09 January 2009 and later In this manual the Sunny Central 250U is referred to as Sunny Central 1 3 Structure of this Documentation The Sunny Central s installation comprises several steps Here we will describe the contents you
22. Central Inverter SUNNY CENTRAL 250U Installation Guide SC250U 1US084912 98 4000712 Version 1 2 SMA Solar Technology AG Copyright 2008 SMA America Inc 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 Inc SMA America 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 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 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 limited to omissions typographical
23. Guide SC250U 1US084912 47 Electrical Connection SMA Solar Technology AG 8 1 Connection Area The cables of the solar modules and the public grid are connected in the Interface Cabinet There are two types of Sunny Central available Sunny Central for the connection of 4 DC strings ree JL H Left side Middle Right side ie UAZZZIZA gi ca 1 oo o oboo Ti PA C eo 00 0 n oojoo oojoo olo oo ele O Oo I 000 p p Li 00000000007 O 0 0 0 0 0 Base Va AC connection DC connection DC connection I O F gt Ground connection 48 SC250U IUS084912 Installation Guide SMA Solar Technology AG Sunny Central for the connection of 6 DC strings Electrical Connection Left side Middle Right side Door am MMT S AENA
24. 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 of the cable tunnel SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Attaching the Conduits The holes in the narrow edge of the u shaped plate must be over the holes in the Interface Cabinet 4 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 be over the holes in the Interface Cabinet 5 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 6 Tighten the screws evenly 7 Place the sealing splints on the middle holes on the right and left of the cable tunnels 8 Place 5 screws in each of the holes see illustration on the right 9 Tighten the screws evenly The cable tunnel is encased 10 Seal the cable tunnel down to the foundation Installation Guide SC250U IUS0849 12 39 Connecting Optional Communication Devices SMA Solar Technology AG 7 Connecting Optional Communication Devices The Sunny Central can be equipped with a Sunny
25. Sunny Central shuts down immediately Sunny Central operation with a generator More information on parameter settings and operating the Sunny Central with a generator can be obtained from SMA Se 67 SMA Solar Technology AG H_Cnt Resetting the hours of operation E_Cnt FanHsCnt FanTrf1 Cnt FanTrf2Cnt FanCab 1 Cnt FanCab2Cnt Individual meters can be reset for example after having mounted a new fan H_Cnt Deletes the hours of operation h On and feed in hours h Total E_Cnt Deletes the total energy provided E Total and the energy provided today Etoday FanHsCnt Deletes the total running time of the heatsink fan FanTrf Cnt Deletes the total running time of the transformer fan 1 FanTrf2Cnt Deletes the total running time of the transformer fan 2 FanCab1 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 without function Dt yyyymmdd Current Date Here you can set the current date Ofs_E Total O 214748364 O kWh The Sunny Central s total energy yield 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 2147483h Oh Total operating time of fan 1 in the Control Cabinet The change of the Ofs_FanCab1 Cnt parameter may be necessary if you exchange your Sunny Cent
26. Sunny Central as described in section 10 2 Opening the Interface Cabinet Page 64 2 Strip the cable by about 1 2 in 3 Open the screw terminal completely Plug the copper inner conductor of the cable into the screw terminal 5 Tighten the screw terminal using an Allen key For required torque see tables above 6 Connect all grounding cables of the modules as described above 50 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Electrical Connection 8 3 Connection of the Solar Modules Do not connect the solar modules until the optional communication cables have been connected see section 7 Connecting Optional Communication Devices Page 40 DC distribution boxes must be installed between the solar modules and the Sunny Central where the solar 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 solar modules are negatively grounded by the Sunny Central The Photovoltaic System Grounding must be installed per the requirements of Sections 690 41 through 690 47 of the National Electrical Code ANSI NFPA 70 and is the responsibility of the installer A DANGER Voltage is present in solar modules exposed to light Death resulting from electric shock Cover the solar modules Switch off the fuses in the DC distribution boxes e g Sunny String Monitor and secure them against rec
27. __ _ A B A Solar modules B DC distribution with DC fuses e g Sunny String Monitor C Sunny Central D AC Fuse E Public grid 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 Installation Guide SC250U 1US084912 13 Safety SMA Solar Technology AG It is prohibited e to use the Sunny central for purposes other than those described here e to connect voltage sources to the Sunny Central other than those consisting of solar modules e 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 A 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 A DANGER During operation high voltages are present in the Sunny Central Death resulting from electric shock e Do not operate the Sunny Central with doors open A DANGER During operation high voltages are present in the Sunny Central Death resulting from electric shock Before commencing work on the Sunny Central e Disconnect completely e Ensure that the devic
28. aded Saving parameter on SD card Installation Guide SC250U IUS084912 69 Parameter SMA Solar Technology AG Pmax 0 250 kw 250 kW Output limit of the Sunny Central Changing the parameter can reduce the output power of the Sunny Central PVPwrMinTr 1200 kw 10kW MPP tracking PVPwrMinTrT 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 1 1800 s Initial voltage of the Sunny Central PVVigStr 0 1200 V 400 V If the voltage increases over the value set at PVVtgStr 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 T Sunny Central operation with a SpntGnPwrMin Ss These parameters are for operation with a generator Contact SMA America if you have questions regarding the operation of the Sunny Central with a generator SpntRemEna Off On On Shutting down the Sunny Central With these parameters the Sunny Central can be shut down remotely Tm hhmmss Current Time Here you can set the current time 11 2 Changing Parameters The changing of the parameters itself is described in the Sunny Central s User Manual 70 SC250U IUSO849 12 Installation Guide SMA Solar Technology AG Technical Data 12 Technical Data In this Section you will find the technical da
29. at 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 gt Sp 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 Verify that the PV ground wires are connected to ground and are isolated from PV or PV Verify that the AC neutral wire is connected to the AC Neutral terminal Verify that the AC phase wires are connected correctly DI DN SS O Verify that all AC phase wires are tightened to the proper torque specification 11 Verify that the AC ground wire is connected correctly 12 Inspect the interior of the Magnetics Cabinet and insure that it is free of any tools foreign objects water debris or documents 58 SC250U 1US084912 Installation Guide SMA Solar Technology AG Commissioning 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 Inspect the interior of the Control Cabinet and Interface Cabinet to insure that they are free of any tools foreign objects water debris or documents 16 Ensure that the area around the Sunny Central is clear of any tools foreign objects or
30. duits ec cece cece eeeee 37 Insert cables from the right into the Sunny Central 37 Insert cables from below into the Sunny Central 38 Connecting Optional Communication Devices 40 Position of the Communication Devices 41 Connecting the Sunny SensorBox optional 41 Connecting the Data Cable of the Sunny SensorBox 42 Sunny WebBox optional 43 Installing the WebBox in the Sunny Central 44 Connecting the Sunny WebBox in the Sunny Central 45 Connecting the Cable to the Sunny WebBox 0 45 Change Display Settings pssssa silla i riapre 46 Electrical Connection 1a potassio 47 Connechon ATO iii ia 48 PE CONNGCHION lt 4 1254 cctciuceeeeaceeedeboienrs sales 50 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG 8 3 8 3 1 8 3 2 8 4 8 4 1 9 9 1 9 2 9 3 10 10 1 10 2 10 3 11 11 1 11 2 12 12 1 12 2 13 14 Connection of the Solar Modules 51 Solar Modules DC Connection LL 58 Solar Modules DC Connection LL 54 ACC OnNe CHOl ste ty yc sere TANE OED EAEE 55 AC Connection A B CN 57 COMMISSIONING 26346 ctuse bro ire 58 Visual Inspection of the Sunny Central 58 Switching the Sunny Central On 59 Check the Ventilation n n fanne 61 Opening the Sunny Central 63 Opening the Control Cabinet 63 Opening the Interface
31. e cannot be reconnected e Ensure that no voltage is present e Ground and short circuit e Cover any nearby live parts 14 SC250U IUS084912 Installation Guide SMA Solar Technology AG A DANGER Normally grounded conductors may be ungrounded and energized when a ground fault is indicated Safety Risk of electric shock e Test before touching Work on the Sunny Central must be carried out by qualified personnel 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 America A N WARNING Operating a damaged Sunny Central may cause severe injury from electric shock The Sunny Central shall only be used when it is technically faultless and safe to operate Operate the Sunny Central only if there are no visible damages 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 A N CAUTION Cuts and scratches due to sharp edges inside the Sunny Central When working on the Sunny Central wear protective gloves Installation Guide SC250U IUS084912 15 Safety SMA Solar Technology AG
32. e copper surfaces and the aluminum surfaces Use only the abrasive webs delivered with the Sunny Central Do not clean the surfaces with sandpaper Do not touch the contact surfaces after they have been cleaned 1 Clean the contact surfaces of the aluminum rails with an abrasive web 2 Clean the cable lugs with an abrasive web 3 Clean the copper aluminum washers with an abrasive web 30 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Transport and Installation 5 4 4 Connect the Cables in the Magnetics Cabinet This section shows you how to connect cables W53 W54 and W55 to the aluminum rails under the transformers in the magnetics cabinet Figure to the right Layout for connecting a cable lug to the aluminum rail in the magnetics cabinet mnm O O FPF gt pi BD Nut Lock washer Cable lug Copper aluminum washer Aluminum rail Screw head Clean the contact surfaces prior to connection see section 5 4 3 Clean the Contact Surfaces for Cable Connection Page 30 Connect cable W53 to aluminum rail A Connect cable W54 to aluminum rail B Connect cable W55 to aluminum rail C Tighten all terminal connection bolts with a torque wrench to 230 in lbs Connect the two plugs of the signal cables to sockets 1 10 and 11 20 in the Magnetics Cabinet Installation Guide A 1 W m g
33. e 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 Use High quality straight through patch cables shielded twisted pair cables of category 5 CAT 5 or higher Installation Guide SC250U IUS084912 43 Connecting Optional Communication Devices SMA Solar Technology AG 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 Mg ws 5 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 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 64 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 44 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Connecting Optional Communication Devices 7 3 2 Connecting the Sunny WebBox in the Sunny Central 1 Plug the W215 connector in
34. errors arithmetical errors or listing errors in the content material SMA America Incorporated 4031 Alvis Court Rocklin California 95677 401 1 Tel 916 625 0870 Fax 916 625 0871 www sma america com Installation Guide SC250U IUS084912 3 SMA Solar Technology AG IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important instructions for Models SC 250U SOLAR INVERTERS that shall be followed during installation and maintenance of the inverter The Sunny Central 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 To reduce the risk of personal injury and to ensure the safe installation and operation of the Sunny Central you must carefully read and follow all instructions cautions and warnings in this Installation Guide Warnings 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 part or all of the SMA equipment and or other equipment connected to the SMA equipment or personal injury A 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 serio
35. he 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 25 8 in 27 1 in 35 3 iN 10 6 in 31 3 in 4 2 in 234in 5 2 2 Size of the Mounting Holes 0 5 in 1 1 4 in 5 2 3 Drilling Holes into the Base A DANGER Drilling into live wires Death resulting from electric shock e Check the installation location for electric cables laid in the base Measure the distances for the holes Mark the positions of the holes Drill the holes into the base on marked positions o NS Put dowels into the drill holes Installation Guide SC250U IUS084912 25 Transport and Installation SMA Solar Technology AG 5 3 Transporting the Sunny Central Remove the plinth panels before transporting the Sunny Central see section 5 4 1 Removing the Plinth Panels from the Sunny Central Page 27 A N WARNING Sunny Central may tip over if improperly transported Bruises and fractures Pay attention to the center of gravity of the Sunny Central see section 5 3 2 Center of Gravity of the Sunny Central Page 27 Transport the Sunny Central 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 Centra
36. l 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 Forklift or pallet truck B Example of Transporting the Sunny Central Cabinet A 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 Ibs and the right cabinet Control and Interface Cabinet weighs 1 490 Ibs 26 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG 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 Central os NS 5 4 Installing the Sunny Central 5 4 1 Removing the Plinth Panels from the Sunny Central Plinth panels are located on the front and back of the Sunny Central The position of the plinth panels is shown in the figure to the right The plinth panels are mounted on the cabinets of the Sunny Central with screws lt A Magnetics Cabinet front side A screws in total 2 screws on the right and 2 screws on y the left l B Control and Interface Cabine
37. lation Guide SMA Solar Technology AG Technical Data Efficiency Maximum efficiency auxiliary power and fans 97 5 330 V 97 4 380 V 97 2 not included 480 V Efficiency curve ammazza 480 V gt gt 8 Cc VU oO E Sen oO gt O 30 40 50 60 70 80 90 100 Output power 12 1 Measurement Accuracy The Sunny Central is not equipped with a calibrated meter The display values may deviate from the actual values and must not be used as a basis for invoicing The Sunny Central s measured values are required for the system management and to control the current to be fed to the grid Deviation Voltage measurement 5 6 V Frequency measurement 0 06 Disconnect time 3 Installation Guide SC250U 1US084912 73 Technical Data SMA Solar Technology AG 12 2 Torques and Cable Sizes Copper conductors only use solid or stranded copper only Connection of the Solar Modules Sunny Central with 4 DC Fuses Number of DC Cable Size Torque Strings Ne el 300 kemil All 194 F 90 C copper 2 0 AWG wire 315 in lbs tightening 300 kcmil All 194 F 90 C copper 2 0 AWG wire 315 in lbs tightening torque Sunny Central with 6 DC Fuses Number of DC Cable Size Torque Strings per DC AO AWG AI 194 F 90 C copper 12 2 AWG wire 315 in lbs tightening PE 4 0 AWG All 194 F 90 C copper Pp 12 2 AWG
38. mpletely 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 5 Connect all DC cables of the solar modules as described above Installation Guide SC250U IUS084912 53 Electrical Connection SMA Solar Technology AG 8 3 2 Solar Modules DC Connection The illustrations below show a Sunny Central which is equipped for connection to 6 or 12 DC strings A Screw terminals for the connection of the solar modules DC cables Position Interface Cabinet right wall middle 1 Strip the cable by about 1 2 in 2 Open the screw terminal completely 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 5 Connect all DC cables of the modules as described above 54 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Electrical Connection 8 4 AC Connection A DANGER High voltages are present in the live components of the low voltage grid Death resulting from burning and electric shock Pay close attention to all safety precaution measu
39. n 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 Ca Diagram 10 O 10 20 30 40 50 60 70 80 90 100 110 120 130 F 76 SC250U IUS084912 Installation Guide SMA Solar Technology AG Installation Guide Appendix Celsius to Fahrenheit conversion SC250U IUS0849 12 77 Appendix Celsius to Fahrenheit conversion SMA Solar Technology AG 78 SC250U 1US084912 Installation Guide SMA Solar Technology AG Installation Guide SC250U IUS0849 12 79 SMA America Incorporated 4031 Alvis Court Rocklin CA 95677 4011
40. nitooiduadtneedeca acd ok 22 Ambient CORONE 2 0256 56 topo gs RESI 22 Minimum Clearance i ss sati Pataca he he paces ea 23 Characteristics of the Bases assago ia iota tla kee ee oan 24 Preparation of the Base LL 25 Position of the Mounting Holes 32 S 1in4 04 24 ancsnie debe eneardared 25 Size of the Mounting HOlES lt lt irpini a 25 Drilling Holes inta the Base asssociati 25 Installation Guide SC250U IUS084912 7 Table of Contents SMA Solar Technology AG 5 3 5 3 1 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 5 4 10 6 6 1 6 2 7 7 7 2 7 2 1 7 3 7 35 7 3 2 7 3 3 7 3 4 8 1 8 2 Transporting the Sunny Central 26 Equipment for Transport solo 26 Center of Gravity of the Sunny Central 27 Installing the Sunny Central 27 Removing the Plinth Panels from the Sunny Central 27 Inserting the Cables into the Cabinets 00000 c eee eee ee 28 Clean the Contact Surfaces for Cable Connection 30 Connect the Cables in the Magnetics Cabinet 0 0 0005 31 Connecting the Cables in the Control Cabinet 33 Attach the Sunny Central to the base 33 Install the Cover Between the Cabinets 000 c cee eee 34 Install Ventilation Plates leleine CA notin ei 35 Attaching the Plinth Plates to the Sunny Central 36 Remove Transport Locks ius ssiscne rase tuyere rarene i iS 36 Attaching the Con
41. nny Central are connected Section 8 Electrical Connection This section describes how the Sunny Central is connected to the grid and to the solar 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 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 12 SC250U 1US084912 Installation Guide SMA Solar Technology AG Safety 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 Central is a solar inverter that converts the DC energy from solar modules to AC energy This energy is then fed to the public grid The Sunny Central 250U is designed for indoor and outdoor installation Principle of a Solar Power System with a Sunny Central A Wf B C A B D E
42. onnection Follow all safety precautions of the module manufacturer 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 Solar Modules Number of strings A 8 or 6 12 DC input voltage 300 600 V DC Max DC current 800 A Installation Guide SC250U IUS0849 12 51 Electrical Connection SMA Solar Technology AG Technical Data for the Cables of the Solar Modules Copper conductors only use solid or stranded copper only Sunny Central with 4 DC Fuses Number of DC Strings Cable Size 300 kcmil All 194 F 90 C copper wire oOo o w 2 0 AWG 315 in lbs tightening torque Sunny Central with 6 DC Fuses Number of DC Strings Cable Size oOo o 4 0 AWG All 194 F 90 C copper wire 315 2 AWG in lbs tightening torque 52 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Electrical Connection 8 3 1 Solar Modules DC Connection The illustrations below show a Sunny Central which is equipped for connection to 6 or 12 DC strings A Screw terminals for the connection of the solar modules DC cables Position Interface Cabinet rear wall middle 1 Strip the cable by about 1 2 in 2 Open the screw terminal co
43. or more details and for tightening torque allowable wire size and type see the Operator s Manual c O US LISTED Utility Interactive 3 Phase Inverter C Tested To Comply With FCC Standards Utility interactive inverter LISTED UL 1741 36AN FOR HOME AND OFFICE USE AA SC250U IUS0849 12 19 Unpacking SMA Solar Technology AG A 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 SMA America Contact information for SMA America is provided below SMA America Incorporated 4031 Alvis Court Rocklin California 95677 401 1 Tel 916 625 0870 Fax 916 625 0871 www sma america com 20 SC250U IUSO0849 12 Installation Guide SMA Solar Technology AG Unpacking 4 2 Scope of Delivery par gt
44. r If there is a voltage present the installation must be checked SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Opening the Sunny Central 10 3 Opening the Magnetics Cabinet 1 Switch off the Sunny Central as described in section 10 1 Opening the Control Cabinet Page 63 2 Make sure that no voltage is present as described in section 10 2 Opening the Interface Cabinet Page 64 3 Remove 8 screws from the front of the magnetics cabinet with a torx screwdriver Sse gt 4 Remove the wall by pulling it forward 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 Installation Guide SC250U 1US084912 65 SMA Solar Technology AG 11 Parameter This section provides an overview of the parameters of the Sunny Central and their respective threshold values 11 1 Parameter Description The following table shows the parameters that are visible in the user and installer levels Grayed out parameters are only displayed in installer mode Ackn Ackowledge an error manually An error can be acknowledged remotely See the Sunny Central s user manual Saving ring memory with errors and events on SD card CardFunc ForcedWrite StoEvtHis StoFailHis ChkGdFrqLo 57 7259 68 tz 59 3 Hz Minimum frequency for Sunny Central ChkGdFrqloT 160 3
45. ral and want to use the data from the old device 68 SC250U IUSO84912 Installation Guide SMA Solar Technology AG Ofs_FanHsCnt 0 2147483h 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 0 Oh Ofs_FanTrf Cnt 2147483 h Ofs_FanTrf2Cnt 2147483 h Total operating time of transformer fan l The change of the Ofs_FanTrf1 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 exchange your Sunny Central and want to use the data from the old device O Ofs_h_On 0 2147483 h Ofs_h_Total O 2147483 h ParaLod Setl Set2 Factory Plimit O 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 lo
46. res regarding the low voltage grid Switch off the AC circuit breaker and secure it against accidental switching on Ensure that no voltage is present A N CAUTION Improper connection to the public grid may cause a fire Burns from fire To reduce the risk of fire e connect only to a circuit provided with 450 amperes maximum branch circuit overcurrent protection in accordance with the National Electrical Code ANSI NFPA 70 e do not connect to an AC load center circuit breaker panel having multiwire branch circuits connected The AC input and AC output circuits are isolated from the enclosure and 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 V AC Max AC current 300 7 A Installation Guide SC250U IUS0849 1 2 55 Electrical Connection SMA Solar Technology AG Technical Data for the AC Connection Cable A B C N Copper conductors only use solid or stranded copper only Number of AC Cable Size Torque Cables A B C 3 600 kcmil All 194 F 90 C copper wire 315 in lbs tightening torque 250 kemil All 194 F 90 C copper wire 315 in lbs tightening torque N 1 or 2 4 AWG All 194 F 90 C copper wire 315 600 kcmil in lbs tightening torque 56 SC250U IUS0849 12 Installation Guide SMA Solar Technology
47. s 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 of the Magnetics Cabinet or Control Cabinet via PG cable glands The position of the cable openings in the Control Cabinet A and the Magnetics Cabinet B is shown in the figure below A 28 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Transport and Installation 1 In a 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 Control Cabinei cabinet into the 3 lower holes at the front of the magnetics cabinet figure to the right position G H J 3 Feed the 6 AC cables from the Magnetics Cabinet into the corresponding holes in the Control Cabinet figure to the right position A B C D E F 4 Feed the 2 sockets containing signal cables from the 09 eee 0006
48. st be accessible at all times e The ambient temperature must be between 13 F and 122 F 25 C and 50 C e Direct solar irradiation reduces the output power of the Sunny Central e For installing the Sunny Central in closed rooms an air supply of 4 000 m3 h is needed e For more information see section 12 Technical Data Page 71 22 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Transport and Installation 5 1 3 Minimum Clearance Observe the specified minimum clearances for the cables ventilation and for opening the doors For installing the Sunny Central in closed rooms an air supply of 5 232 cu yd h is needed fh rein p Installation Guide SC250U IUS084912 23 Transport and Installation SMA Solar Technology AG 5 1 4 Characteristics of the Base 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 0 1 in 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 tag Page 38 24 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Transport and Installation 5 2 Preparation of t
49. t front side 6 screws in total 2 screws on the right 2 screws in the middle and 2 screws on the left C 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 D Magnetics Cabinet rear side 4 screws in total 2 screws on the right 2 screws on the left Installation Guide SC250U IUS084912 27 Transport and Installation SMA Solar Technology AG 1 Remove plinth panels on the front and on the rear of both cabinets of the Sunny Central using a torx screwdriver 2 Remove the plinth panels by pulling them toward you see figure on the right 3 Load the cabinets on a forklift or a crane fork from the front see section 5 3 1 Equipment for Transport Page 26 4 Transport the cabinets to the installation site During transport be sure to follow all the instructions provided a E in section 5 3 Transporting the Sunny Central Page _ KL 26 O 5 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 A 6 Install the Magnetics Cabinet with a clearance A of about 20 inches 7 Open the Control Cabinet as described in section 10 1 Opening the Control Cabinet Page 63 8 Open the Magnetics Cabinet as described in section 10 3 Opening the Magnetics Cabinet Page 65 5 4 2 Inserting the Cables into the Cabinet
50. t guarantee conditions are available at www sma america com and can be downloaded or are available on paper from the usual sales channels if required For warranty coverage or if you have questions about the Sunny Central warranty contact SMA America at the address telephone number or Web site listed on page 3 to send E mail see the Contact section of the SMA America Web site Installation Guide SC250U IUS084912 5 SMA Solar Technology AG SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Table of Contents Table of Contents 1 1 1 2 1 3 2 2 1 2 2 3 3 1 3 2 3 3 3 4 3 5 4 4 1 4 2 4 3 5 Dal 5 1 1 5 1 2 5 1 3 5 1 4 5 2 5 2 1 5 2 2 5 2 3 Notes on this Manual 0 cece cece eee ee 11 Tarje GOUD sus sprp e alienare ea 11 ValidilVissssssistaiia NE O E EA 11 Structure of this Documentation LL 11 Salentina 13 Appropriate USAGE prete cei 13 Safety Instructions rn lele ae eee ees 14 The Sunny Central 17 System Overview caiano di 17 The Sunny Central s Design rurale 17 Location of the Safety Notices 18 Identifying the Sunny Central 19 EMW e due ehhh loa een anatase aed bn si 19 UNPOCKINGS 4c euei ani aren ee aera 20 Unpacking and INspechons csc25oeu4ces ole i 20 Scope Of Delivery iride 21 DIONE c EOE E RIPA DEC OE ESTERE SS 21 Transport and Installation 22 Choosing the Installation Site 22 Dimensions GNG Weigh 2 4 2 lt 4tiedeubtu
51. ta for the Sunny Central s operation the norms to which it conforms and the required cables and torques Solar Generator Connection Data DC input voltage 300 600 V DC Input voltage MPP range 300 330 V DC at reduced power 330 600 V DC at full power DC starting voltage 400 V DC adjustable Max input current 800 A Grid Connection Data Nominal output power at 113 F 45 C 1250 kW Output power at 300 V DC 230 kw Nominal AC voltage 480 V AC AC nominal frequency 60 Hz General Data Inverter technology True sine wave current source high frequency PWM with galvanic insulation Max operating altitude 13 000 ft above sea level Power Reduction The Sunny Central can function without power reduction up to 3 300 feet above sea level At higher altitudes the power is reduced by 5 per 3 300 ft Ambient temperatures 13 F 113 F 25 C 45 C without power reduction 13 F 122 F 25 C 50 C with power reduction Output power at 122 F 50 C 173 5 KW Installation Guide SC250U IUS0849 12 71 Technical Data SMA Solar Technology AG Cooling Temperature controlled fans for cooling Easily removable filters easily accessible Dimensions W x H x D including roof in in approx 109 7 x 79 8 x 32 7 Weight Total approx 4 200 lbs Magnetics Cabinet 2 710 lbs Control and interface cabinet 1 490 lbs Internal consumption 72 SC250U IUS0849 12 Instal
52. text line reads OP MODE WEBBOX Press knob once The display shows e g current time and date of the Sunny WebBox Turn off the Sunny Central as described in section 10 Opening the Sunny Central Page 63 and turn it on again For more information concerning the operation of the Sunny Display please refer to the Sunny Central s user manual 46 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Electrical Connection 8 Electrical Connection This section describes how the Sunny Central is connected to the grid and to the solar 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 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 ESD safety regulations Discharge electrostatic charge by touching the grounded Sunny Central enclosure 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 Do not open 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 Installation
53. 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 solar 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 Remove the plate screws 2 Putthe screws and washers aside 3 Remove plate Installation Guide SC250U IUS084912 37 Attaching the Conduits SNS A 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 connection of 4 DC strings B Example for a 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 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 SMA Solar Technology AG 6 2 Insert cables from below into the Sunny Central Insert the solar generator cables the AC cables and the data cables into the Sunny Central from the bottom through the foundation l 38
54. to 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 usually 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 37 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 Installation Guide SC250U IUS084912 45 Connecting Optional Communication Devices SMA Solar Technology AG 7 3 4 Change Display Settings As standard the Sunny Central is shipped with a Sunny Display The operating mode of the Sunny Display must be changed in order to additionally refit a Sunny WebBox Proceed as follows 2 Hold the knob and the button down for 5 seconds Turn the knob until the text line reads SETTINGS Press knob once The Sunny Display changes to the SETTINGS menu Turn the knob until the text line reads OPERATION MODE Press knob once The Sunny Display changes to the OPERATION MODE menu The display shows the current operation mode Turn the knob until the
55. us injury A N CAUTION CAUTION indicates a hazardous situation which if not avoided could result in minor or moderate injury NOTICE NOTICE indicates a situation that can result in property damage if not avoided 4 SC250U 1US084912 Installation Guide SMA Solar Technology AG Other Symbols In addition to the safety and hazard symbols described on the previous pages the following symbol is also used in this Installation Guide i Information This symbol accompanies notes that call attention to supplementary information that you should know and use to ensure optimal operation of the system General Warnings General Warnings All electrical installations must be done in accordance with the local and National Electrical Code ANSI NFPA 70 The Sunny Central contains no user serviceable parts For all repair and maintenance always contact an authorized SMA Service Center Before installing or using the Sunny Central read all of the instructions cautions and warnings on the Sunny Central the PV array in this Installation Guide and in User Manual Before connecting the Sunny Central to the electrical utility grid contact the local utility company This connection must be made only by qualified personnel PV arrays produce electrical energy when exposed to light and thus can create an electrical shock hazard Wiring of the PV arrays shall only be performed by qualified personnel Warranty The currec
56. wire 315 in lbs tightening Connection to the AC Grid Number of AC Cable Size Torque Cables A B C 3 600 kcmil All 194 F 90 C copper wire 315 in lbs tightening torque 250 kcmil All 194 F 90 C copper wire 315 in lbs tightening torque N l or2 4 AWG 600 kcmil All 194 F 90 C copper wire 315 in lbs tightening torque 74 SC250U IUS0849 12 Installation Guide SMA Solar Technology AG Contact 13 Contact If you have technical problems concerning our products contact your installer or the SMA Service Line We require the following information in order to provide you with the necessary assistance Inverter type Type and number of modules connected Communication method Serial number of the Sunny Central Failure or warning number of the Sunny Central Display of the Sunny Central SMA America Incorporated 4031 Alvis Court Rocklin California 95677 401 1 Tel 916 625 0870 Fax 916 625 0871 info SMA America com www SMA America com Installation Guide SC250U IUS084912 75 Appendix Celsius to Fahrenheit conversion SMA Solar Technology AG 14 Appendix Celsius to Fahrenheit conversion The Sunny Central measures temperature in degrees 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 Conversio

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