Installation Manual - SMA STRING-COMBINER
Contents
1. MODELS Installation Manual DC CMB IA U10 xx en 17 6 Electrical Connection SMA Solar Technology AG 6 Electrical Connection 6 1 Connection Instructions 6 1 1 Preliminary Checks DANGER Before connecting the CMB to the photovoltaic plant make sure that The fuses not inserted in the fuse holder The disconnecting switch is open lever set to OFF The CMB is in good condition and there was no damage during transport The CMB is firmly anchored to walls and stable supports There are no remaining metallic parts chips and derivatives from the installation activities A DANGER After performing the checks listed in the points above proceed to wire the cables according to what is shown in the wiring diagram making sure to use suitable sizes and colors Before connecting the cables coming from the strings at the top of the fuse holder inside the enclosure it is recommended to join them end to end with suitable tips in order to prevent possible short circuits between adjacent cables Note that the panel does not contain blocking diodes If the photovoltaic array has zones that are not irradiated evenly for example due to partial shading use blocking diodes to prevent the circulation of inverse currents in the strings which may lower the system s performance Make sure the yellow green grounding conductor is connected to the arrester and to the terminal Make sure that the DC connections2. e Training in how to deal with the dangers and risks associated with installing and using electrical devices and systems e Training in the installation and commissioning of electrical devices Knowledge of all applicable standards and directives e Knowledge of and compliance with this document and all safety precautions 2 3 Instructions and Warnings Failure to follow these instructions may have serious consequences such as the destruction of the device personal injury or death due to electric shock Therefore the following safety instructions must be read and understood prior to installation and use of the Combiner Box For any clarifications or additional information contact the SMA technical service Explanation Once the product has been removed from its original packaging visually inspect for dam age that may have occurred during shipment If damage is found contact the distributor or manufacturer This product must only be used for the purpose for which it has been designed Any other DANGER use is considered improper and therefore dangerous The manufacturer is not liable for possible damage caused by improper incorrect or unreasonable use A DANGER SMA holds itself responsible only for the product in its original configuration SMA declines all responsibility for consequences deriving from non original spare parts Any intervention that alters the structure or the operating cycle of the product must be car
3. ried out or authorized by SMA Solar Technology AG This manual is an integral and essential part of the product Carefully read the recommendations contained in it since they provide important informa tion on safe use and maintenance SMA may make technical changes in this manual and to the product at any time without notice In case of typing errors or other types of errors the corrections will be included in the new versions of the manual NOTICE n lt Installation Manual DC CMB IA U10 xx en 5 2 Safety SMA Solar Technology AG 2 4 Position and securing Failure to follow these instructions may have serious consequences such as the destruction of the device personal injury or death due to electric shock Therefore the following safety instructions must be read and understood prior to installation and use of the Combiner Box For any clarifications or additional information contact the SMA Solar Technology n lt 3 o Explanation NOTICE The enclosure is made of fibreglass with protection rating of IP54 NOTICE If positioning in a closed environment make sure the area is ventilated and allows regular recirculation of air If installing in an open environment position the enclosure in an area that is constantly shaded and protected from exposure to direct sunlight These measures are important for preventing unnecessary and excessive overheating which prolonged in time i
4. Position E F 4 x to E Designation uM Screw M12 Washer Tin plated copper busbar Tin plated tube terminal lug Fender washer Spring washer Nut M12 26 DC CMB IA U 1 0 xx en Installation Manual SMA Solar Technology AG 6 Electrical Connection 6 7 3 Connection procedure l Ensure that the DC subdistribution is switched off and secured against reconnection see Section 8 Disconnecting and Reconnecting 2 Ensure that the inverter is disconnected on the DC side and secured against reconnection see inverter manual 3 Lead the DC main cables into the DC subdistribution through the designated enclosure opening see Section 6 with the appropriate seal insert see Section 6 4 Fitthe DC main cables with tube terminal lugs Make sure that no pieces of cable are dropped into the DC subdistri bution 5 n the DC subdistribution remove the fastening material for the DC main cables from the busbars 6 Clean the contact surfaces using a clean cloth and ethanol cleaning agent Do not touch the contact surfaces after cleaning Additionally required material not included in the scope of delivery Ring terminal lugs size for M12 screw Clean cloth Ethanol cleaning agent Procedure 1 Strip off the DC cable insulation 2 Fit the DC main cables with ring terminal lugs 3 Clean the contact surfaces using a clean cloth and ethanol cleaning age
5. be exposed to direct solar irradiation 000 Requirements for mounting O Mount the Combiner Box in such a way that the connection area is facing downwards O Do not mount the Combiner Box in a horizontal or inclined position An external cable support rail must be provided Example Mounting the Combiner Box If the PV array is mounted on a free standing structure the Combiner Box can be fixed to this structure in a shaded position Make sure that the Combiner Box enclosure is not mounted in the path of rainwater flowing off the module surface Installation Manual DC CMB IA U10 xx en 13 5 Assembly SMA Solar Technology AG 5 1 2 Mounting the Combiner Box Danger of crushing if the Combiner Box is dropped e When mounting the Combiner Box take the weight of up to 35 kg into account e Two people are needed to mount the Combiner Box e Installer should use personal protective equipment NOTICE Damage to cable glands and plug connections due to improper transport and installation The cable glands and plug connections protrude from the enclosure e When transporting and mounting the Combiner Box ensure that the cable glands and plug connections are not damaged Additionally required mounting material not included in the scope of delivery e Four M8 screws Take wall properties into account when choosing the screw type e Four washers e If necessary four screw anchors Take wall properties into account w
6. of the product together with the household waste but in accordance with the locally applicable disposal regulations for electronic waste 1912 4 3 DC Load Break Switch The Combiner Box can be disconnected on the inverter side by means of a DC load break switch The use of the DC load break switch is only permissible if LV HRC fuses with gPV characteristic are installed upstream in the inverter or main DC distribution box Installation Manual DC CMB IA U10 xx en 11 4 Product Description SMA Solar Technology AG 4 4 String Fuses The string fuses protect the PV modules of a PV system from reverse currents Only install string fuses supplied or approved by SMA Solar Technology AG as accessories for Combiner Box Figure 4 Principle of reverse current reverse current can occur when different open circuit voltages are applied to PV modules connected in parallel In this event the reverse current can be much higher than the short circuit current of the PV modules The higher the reverse current the more the PV modules of the faulty string will heat up Strong heat build up can destroy the modules of the faulty string reverse current can be caused by the following a short circuit in one or more modules a short circuit in one or more cells in a module a double ground fault in a module a double ground fault in the cabling The string fuses trip when the string current is too h
7. 2 37 78 60 Rom nia Vezi esko Cehia Schweiz Siehe Deutschland Slovensko pozri esko esk republika South Africa SMA Solar Technology 08600 SUNNY South Africa Pty Ltd 08600 78669 Centurion Pretoria International 27 12 643 1785 United Kingdom SMA Solar UK Ltd 44 1908 304899 Milton Keynes SMA Hellas AE 801 222 9 222 International 30 212 222 9 222 EAAdOa Solar Thailand Co Ltd 66 2 670 6999 Ty ety SMA Technology Korea Co Ltd 82 2 508 8599 E 971 2 234 6177 SMA Middle East LLC el ul ok Laga Other countries International SMA Service Line Toll free worldwide 00800 SMA SERVICE Niestetal 800 762 7378423 Installation Manual DC CMB IA U10 xx en 35 SMA Solar Technology
8. 6 8 Connecting the Grounding Cable ralenti TE e 20 ZI Safety during Comimissionirig Ie ep Ie 28 7 2 Commissioning the Combiner Box esee a tenente tenentes tnte tenente teen a tente se nen a entere 28 7 2 1 Requirements for Commissioning ui 28 7 3 Voltage Check Measuring Procedure iii 28 8 clelia lio ila 8 1 Periodic Maintenance T ed vno Neto 30 8 2 Extraordinary Maintenance esesseeeeeeneete tete tnnt TA nente te nen sese ten tese ten tnse eene tenente T e E tenente tenen sene s 30 9 DIsconneci ng socia 10 Decommissioningia lalla aa DE 10 1 Disassembling the Combiner BOx ee 32 10 2 Disposing of the Combiner Box sese E E A AEEA A A as 32 TT Technical Data tint dl ded 12 Gonta m Ecce OM Installation Manual DC CMB IA U10 xx en 3 1 Information on this document SMA Solar Technology AG 1 Information on this Document Validity This document is valid for the following device types DC CMB U10 16 e DC CMB U10 24 e DC CMB U10 32 Target Group This document is intended for qualified persons Only persons with the appropriate skills are allowed to perform the activities described in this document see Section 2 2 Skills of Qualified Persons page 5 Additional Information Links to addition
9. 7 Praha Chile Ver Espa a Danmark Se Deutschland Tyskland Deutschland SMA Solar Technology AG Medium Power Solutions Niestetal Wechselrichter 49 561 9522 1499 Kommunikation SMA Online Service Center 49 561 9522 2499 www SMA de Service Hybrid Energy Solutions Sunny Island PV Diesel Hybridsysteme 49 561 9522 399 49 561 9522 3199 Power Plant Solutions Sunny Central 49 561 9522 299 Espafia SMA Ib rica Tecnolog a Solar Llamada gratuita en Espafia S L U Internacional 900 14 22 22 Barcelona 34 902 14 24 24 France SMA France S A S Medium Power Solutions Lyon Onduleurs 33 472 09 04 40 Communication 33 472 09 04 41 Hybrid Energy Solutions Sunny Island 33 472 09 04 42 Power Plant Solutions Sunny Central 33 472 09 04 43 India SMA Solar India Pvt Ltd Mumbai 91 22 61713888 Italia SMA Italia S r l Milano 39 02 8934 7299 K rrpog EMdda Kibris Bkz Yunanistan Luxemburg Siehe Belgien Luxembourg Voir Belgien Belgique 34 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 12 Contact Magyarorsz g l sd esko Csehorsz g Nederland zie Belgien Belgi sterreich Siehe Deutschland Per Ver Espa a Polska Patrz esko Czechy Portugal SMA Solar Technology Portugal Isento de taxas em Portugal Unipessoal Lda Internacional 800 20 89 87 Lisboa 351 2 1
10. MA Solar Technology AG 6 Electrical Connection 6 3 5 Inserting the Cables into the Switch Cabinet DC CMB U10 32 SY p x x NS I 9 WV 9 NS VAR N N 27 E A B C D E Figure 8 Bottom view of Combiner Box with cable glands example Position Designation A Cable entry for connecting the strings positive terminal B Output DC cable gland Grounding cable gland D Protective vent E Cable entry for connecting the strings negative terminal Installation Manual DC CMB IA U10 xx en 23 6 Electrical Connection SMA Solar Technology AG 6 3 6 Overview of the Connection Area DC CMB U10 32 The features of the Combiner Box are dependent on the order option The maximum configuration of the Combiner Box is shown in the overview diagrams Combiner Box with cable glands for the string cables E B Figure 9 Connections as exemplified in the DC CMB U10 32 Position Designation A Cable entry for connecting the strings pole B Cable entry for connecting the strings pole Surge protection device D Switch E Grounding terminal 24 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 6 Electrical Connection 6 4 Lea
11. PG32 with 4 input each 8 PG32 with 4 input each Directly on Fuse Holder 4 mm to 6 mm DIN Rail Mounting 1 pole 1000 V 10 3 x 38 1 000 V gPV 20A TO Ato 25A 10 Ato 20A Nr 1 M50x1 5 with reduction per pole Nr 2 M50x1 5 with reduction per pole Nr 2 M50x1 5 with reduction per pole 17 mm to 38 mm 17 mm to 38 mm 17 mm to 38 mm Conductor Material Copper or aluminium Terminal Type Copper busbar with M12 screw Switch Type Under Load Switch Disconnector 2 pole 1 000 Vc SPD Protection SPD Type Il 15 kA 40 kA Note 1 Derating of V versus altitude 1 0 per 100 m from 2 001 m to 3 000 m 1 2 96 per 100 m from 3 001 m to 4 000 m Note 2 Derating of 196 K of max current from 50 to 60 Installation Manual DC CMB IA U10 xx en 39 12 Contact SMA Solar Technology AG 12 Contact If you have technical problems concerning our products contact our SMA Service Line We need the following data in order to provide you with the necessary assistance Combiner Box type Serial number of the Combiner Box Type and number of PV modules connected Australia SMA Australia Pty Ltd Toll free for Australia 1800 SMA AUS Sydney 1800 762 287 International 61 2 9491 4200 Belgien SMA Benelux BVBA SPRL 32 15 286 730 Belgique Mechelen Belgi Brasil Vide Espa a Espanha esko SMA Central amp Eastern Europe s r o 420 235 010 41
12. Protective covers must always be mounted 6 3 Inserting the Cables into the Switch Cabinet 6 3 1 DC CMB U10 16 Figure 8 Bottom view of Combiner Box with cable glands example Position Description A Cable entry for connecting the strings positive terminal Output DC cable gland Grounding cable gland Protective vent mono Cable entry for connecting the strings negative terminal Installation Manual DC CMB IA U10 xx en 19 SMA Solar Technology AG 6 Electrical Connection 6 3 2 Overview of the Connection Area DC CMB U10 16 The features of the Combiner Box are dependent on the order option The maximum configuration of the Combiner Box is shown in the overview diagrams Combiner Box with cable glands for the string cables Figure 9 Connections as exemplified in the DC CMB U10 16 Position Designation A Cable entry for connecting the string positive terminal B Negative input string fuse holder Surge protection device D Switch E Cable entry for connecting the strings negative terminal 20 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 6 Electrical Connection 6 3 3 Ins
13. Risk of burns due to hot components or devices Some components of the Combiner Box can get very hot during operation Touching these components can cause burns Observe the warnings on the components During operation do not touch any components or devices marked with such warnings After disconnecting the PV system from voltage sources wait until all hot components have cooled down sufficiently Wear suitable personal protective equipment for all work on the device 8 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 3 Scope of Delivery 3 Scope of Delivery Check the scope of delivery for completeness and any externally visible damage Contact your distributor if the scope of delivery is incomplete or damaged DC CMB U10 16 24 32 for Wall Mounting 4 LX Figure 2 Components included in the scope of delivery for wall mounting Position Quantity Designation DC CMB U10 16 24 32 Combiner Box Combiner Box door key Wall mounting rail Caps and reducing inserts kit gt 1 1 4 4 Screw for wall mounting rail 1 1 Installation manual circuit diagram test report declaration of conformity Installation Manual DC CMB IA U10 xx en 9 4 Product Description SMA Solar Technology AG 4 Product Description 4 1 Combiner Box DC CMB U10 16 24 32 The DC CMB U10 16 24 32 Combiner Box is a PV array junction box to which several str
14. al information can be found at www SMA Solar com Symbols Symbol Explanation DANGER Indicates a hazardous situation which if not avoided will result in death or serious injury Indicates a hazardous situation which if not avoided can result in death or serious injury Indicates a hazardous situation which if not avoided can result inminoror moderate injury Indicates a situation which if not avoided can result in property damage Indicates a requirement for meeting a specific goal Desired result Packaging instructions Describes the installation procedure of the product Describes the use of the product and its graphic display Contains useful information for disposing of the product A DANGER _ A WARNING _ CAUTION lex d A Nomenclature This document is relevant for the SMA String Combiner Box for Utility Power System They are jointly referred to in the following as Combiner Box 4 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 2 Safety 2 Safety 2 1 Intended Use A Position Explanation PV array Combiner Box Sunny Central Transformer Utility grid 2 2 Skills of Qualified Persons The tasks described in this document must be performed by qualified persons only Qualified persons must have the following skills e Knowledge of how the device works and is operated
15. ar personal protective equipment when working on the Combiner Box Do not touch live components Before performing any work always disconnect the Combiner Box from voltage sources unless supply voltage is absolutely necessary Switch off the DC load break switch in the Combiner Box With power off remove the DC fuses in the central inverter or main DC distribution box Use the IV HRC fuse handle to do this Only open the fuse holders when the Combiner Box is switched off Ensure that the device cannot be reconnected Ensure that no voltage is present Ground and short circuit Cover or isolate any adjacent live components Protective covers must always be mounted Danger to life from electric shock due to live DC cables DC cables connected to PV modules that are exposed to sunlight carry live voltage Touching live DC cables results in death or serious injury e Prior to connecting the DC cables ensure that the DC cables are voltage free e Wear suitable personal protective equipment when working on the Combiner Box DANGER Danger to life from electric shock due to ground fault In the event of a ground fault grounded PV systems can still be live Touching system components that have not been properly grounded results in death or serious injuries from electric shock e Before working on the PV system ensure that no ground fault is present e Wear suitable personal protective equipment for all work on the device Danger to life fro
16. are properly secured inside the terminals in order to prevent possible overheating that may lead to dangerous situations Use tools with control torque with the following data Fuse holders 2 Nm Output DC cable Screw M12 type 70 Nm Before closing the fuse box bases check the entire side of the photovoltaic array for any wiring errors such as polarity inversion of the strings or excessive voltages above the maximum permissible values These types of wiring errors can cause serious damage to the system or cause dangerous situations for people These types of wiring errors may cause fires 18 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 6 Electrical Connection 6 2 Safety during Electrical Connection DANGER Danger to life due to electric shock High voltages are present in the live components of the Combiner Box Therefore work on the Combiner Box is only allowed if the power is disconnected and the guidelines that apply at the installation location are strictly followed e Disconnect from voltage sources Switch off the DC load break switch in the Combiner Box With power off remove the DC fuses in the central inverter or main DC distribution box Use an LV HRC fuse handle Only open the fuse holders when the Combiner Box is switched off Ensure that the device cannot be reconnected Ensure that no voltage is present Ground and short circuit Cover or isolate any adjacent live components
17. ation Manual SMA Solar Technology AG 9 Disconnectiong 9 Disconnecting A DANGER Danger to life due to electric shock when touching live components of the Combiner Box Observe the following safety rules when disconnecting Disconnect from voltage sources Ensure that the device cannot be reconnected Check that no voltage or current is present Ground and short circuit Cover or isolate any adjacent live components Risk of burns from touching hot components Wear personal safety equipment when working on the device Procedure 1 Switch off the DC load break switch This ensures that there is no current flow through the Combiner Box 2 Disconnect the Sunny Central from voltage sources see Sunny Central installation manual If there are fuses in the Sunny Central remove them Use the LV HRC fuse handle to do this or If there are no fuses in the Sunny Central remove the fuses in the DC main distributor 3 Only open the fuse holders in the Combiner Box with power switched off Installation Manual DC CMB IA U10 xx en 31 10 Decommissioning SMA Solar Technology AG 10 Decommissioning 10 1 Disassembling the Combiner Box Requirement The DC CMB U10 16 24 32 Combiner Boxes must be disconnected from voltage sources Procedure Open the doors of the Combiner Box Disconnect the string cables from the fuse holders Disconnect the DC main cable Disconnect the grounding cable Release the ca
18. ble glands Pull all cables out of cable glands and cable feed through plates and property isolate them Disassemble the Combiner Box QN OL OS es 10 2 Disposing of the Combiner Box Dispose of the Combiner Box in accordance with the applicable disposal regulations for electronic waste 32 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 11 Technical Data GENERAL DATA 11 Technical Data DC CMB U 10 16 DC CMB U10 24 DC CMB U10 32 Max voltage DC 1 000 V Note 1 Max input short circuit current IscSTC 12 5A 12 5A 12 5A Max output short circuit current IscSTC 220 A 300 A 360 A MECHANICAL DATA Enclosure GRP Glass Fiber Reinforced Polyester Enclosure Dimensions W x D x H in mm 550 x 260 x 650 590 x 285 x 790 Weight 24 2 kg 26 9 kg 34 kg Degree of Protection IP 54 outdoor installation Protection Class CLASS Il Color RAL RAL 7035 ENVIRONMENT DATA Ambient temperature during normal operation 25 C to 60 Note 2 Ambient temperature during storage 40 C to 70 Humidity O 96 to 95 96 non condensing Altitude up to 4 000 m DC INPUT DATA Number of strings 16 24 32 Sealing range cable entry 5 mm to 8 mm Input cable glands entry per pole Input connection Conductor cross section Fuse holder Fuse type Fuse size DC OUTPUT DATA Output cable glands Clamping Area 4 PG32 with 4 input each 6
19. cte i e rette d E el ae PR a ib nire dete de RR epe aed 19 6 3 Inserting the Cables into the Switch Cabinet essere entente tenente eene tenente tenentes 19 6 39 TDC7CMB UITO 16 2 uut E ie Lc D EccL i a ie iti caio 19 6 3 2 Overview of the Connection Area 010 16 2 22 0 0200 tenente entente 20 6 3 3 Inserting the Cables into the Switch Cabinet DC CMB U10 24 0 0 ecessssscsscsscsseeseeseesscsssnssussesseeseeuscuscuscucsecsscaeuecuscnssussusasseeneenseneensees 21 6 3 4 Overview of the Connection Area 10 24 rei 22 6 3 5 Inserting the Cables into the Switch Cabinet 10 32 23 6 3 6 Overview of the Connection Area 1 10 32 24 6 4 Leading the Cables through the Cable Glands with Sealing Ring Cut Outs eene 25 6 5 Connecting the String Cables ia EH deoa ete edes a sepes 25 EG Te LITTLE SEE ERR ii i 25 6 6 Connecting the Main Cables petiere iii er aana 25 6 6 TCable Requirements cssc i S 25 6 7 Assembly of the Connection trat et e eee d e de d eel eie erii ee de i es 26 6 7 M Two Terminal bugs 26 67 2 One Ter IR e HI 26 6 7 3 Conne ction procedure stu E Ei cec EIUS 27
20. d break switch in the Combiner Box With power off remove the DC fuses in the central inverter or main DC distribution box Use the LV HRC fuse handle to do this Only open the fuse holders when the Combiner Box is switched off Ensure that the device cannot be reconnected Ensure that no voltage is present Ground and short circuit Cover or isolate any adjacent live components Protective covers must always be mounted 7 2 Commissioning the Combiner Box 7 2 1 Requirements for Commissioning Commissioning must be performed by Service employees only Commissioning of the Combiner Box must be performed by Service employees of SMA Solar Technology AG or their authorized representatives only The commissioning report must be completed during commissioning Requirements The DC load break switch is switched off The DC main cables are connected to the inverter or main DC distribution box and disconnected from voltage sources There is no reverse voltage from the inverter L1 All connections have been made in accordance with this manual see Section 6 Electrical Connection page 17 The correct polarity of all connections has been ensured and documented L1 The floor around the Combiner Boxs is firm and freely accessible 7 3 Voltage Check Measuring Procedure Use a voltmeter with a voltage range up to 1 500 This check is made by measuring the open circuit voltage of the panels obtained at minimum irradiatio
21. ding the Cables through the Cable Glands with Sealing Ring Cut Outs Seal insert for cable glands for DC main cables Cable glands for the DC main cables are each supplied with two seal inserts for different cable sizes Cable diameter for seal insert 24 0 mm to 38 5 mm Use mounted seal insert 17 0 mm to 31 0 mm Replace seal insert for the seal insert supplied in the scope of delivery Procedure 1 Release the cable gland 2 Remove the filler plug from the cable gland 3 When inserting the DC main cables replace the seal insert with the insert in the scope of delivery if necessary see above table Lead the cable through the swivel nut of the cable gland Ensure that the thread of the swivel nut is facing upwards Lead the cable through the seal insert Insert the seal insert into the cable gland together with the cable Cut the cable to length Tighten the cable gland with the appropriate torque Cable gland for DC main cable 7 5 Nm CONAN 6 5 Connecting the String Cables SMA Solar Technology AG recommends using bootlace ferrules for connecting the string cables to the fuse holders 6 5 1 Cable requirements PV cable type must be available O Conductor cross section of the string cable for connection of one string cable to the fuse holders 4 mm to 6 mm Procedure 1 Attach the string cables to an external cable support rail 2 Cut the string cables to length and strip 11 mm off the insulatio
22. e following points e There are no evident signs of rust or corrosion which may impair functioning and safety Yearly Visual inspection e There no water infiltrations and excessive dust infiltration Yearly Visual inspection e The mass grounding and drains are efficient Yearly Visual inspection e There is insulation between the electrical circuits and masses 5 Year Insulation test e All the DC and AC connections are correctly tightened Yearly Dynamometric torque tool e There are no burn marks on the terminals Yearly Visual inspection e door panel of the enclosure is firmly closed at the end of all the checks and after any maintenance Yearly Visual inspection 8 2 Extraordinary Maintenance If damaged components need to be replaced for example fuses SPD etc only use materials identical to those originally supplied A list of these materials is available in the wiring Diagram If in doubt contact the manufacturer If the electrical connections are damaged due to mechanical or electrical causes or due to rodents immediately disconnect the system or at least the damaged part After verifying that no failures were caused to the equipment proceed with the replacement of the wires using similar materials All the maintenance operations must be performed by taking into account all safety instructions checking beforehand that the components are not powered 30 DC CMB IA U10 xx en Install
23. erting the Cables into the Switch Cabinet DC CMB U10 24 2 2 8 N 2 Figure 8 Bottom view of Combiner Box with cable glands example Position Designation A Cable entry for connecting the strings positive terminal Output DC cable gland Grounding cable gland Protective vent Cable entry for connecting the strings negative terminal Installation Manual DC CMB IA U10 xx en 21 6 Electrical Connection SMA Solar Technology AG 6 3 4 Overview of the Connection Area DC CMB U10 24 The features of the Combiner Box are dependent on the order option The maximum configuration of the Combiner Box is shown in the overview diagrams Combiner Box with cable glands for the string cables Figure 9 Connections as exemplified in the DC CMB U10 24 Position Designation A Cable entry for connecting the strings positive terminal B Cable entry for connecting the strings negative terminal Surge protection device D Switch E Grounding terminal 22 DC CMB IA U10 xx en Installation Manual S
24. hen choosing the screw anchor type Figure 6a Dimensions of the Combiner Box 16 24 14 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 8 il Figure 6b Dimensions of the Combiner Box 32 Procedure 1 Mark the position of the drill holes on the wall or stand 2 Drill holes at the marked positions 5 Assembly 3 If necessary insert the screw anchors Attach the two mounting rails to the Combiner Box with the screws supplied torque 15 Nm 4 Fasten the Combiner Box to the wall or stand using suitable screws and washers 5 Ensure that the Combiner Box is securely fixed Installation Manual DC CMB IA U10 xx en 5 Assembly SMA Solar Technology AG 16 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 5 Assembly 5 2 Drilling Template for Mounting Le K 4 L E F B n Figure Dimension Dimension mm A B S D E F G H K L M DC CMB U10 16 DC CMB U10 24 498 550 575 599 650 675 299 5 337 5 287 5 249 8 DC CMB U10 32 494 618 634 696 822 836 348 418 317 247 8
25. igh and protect the PV modules of the faulty string 4 5 Overvoltage Protection The Combiner Box is equipped with a surge arrester for overvoltage protection The surge arrester protects the inverter from transient overvoltages In order to guarantee the overvoltage protection function the surge arrester must be connected to the external grounding 12 DC CMB IA U 1 0 xx en Installation Manual SMA Solar Technology AG 5 Assembly 5 Assembly 5 1 Wall Mounting 5 1 1 Selecting the Mounting Location Fire hazard due to wrong choice of mounting location Under fault conditions electric arcs may occur in the Sunny String Monitor Electric arcs can cause fires if the Sunny String Monitor is mounted on flammable materials Do not mount the SMA String Combiner on flammable construction materials Do not mount the SMA String Combiner near highly flammable materials Do not mount the SMA String Combiner in potentially explosive atmospheres Requirements for the mounting location The mounting location must not be in a living or office area The mounting location must not block any escape routes The mounting location must be freely and safely accessible at all times without the necessity for any auxiliary equipment such as scaffolding or lifting platforms Non fulfillment of these criteria may restrict servicing The mounting location must be suitable for the weight and dimensions of the Combiner Box The mounting location must not
26. ings can be connected in parallel Figure 3 Block circuit diagram of the DC CMB U10 16 24 32 Combiner Box The string fuses in the Combiner Box protect the PV modules of the strings from reverse currents 4 2 Type Label There is one type label attached to the Combiner Box The type label is located inside the right hand door of the Combiner Box You will find the following information on the type label e Manufacturer e Device type and option code Serial number e Device specific characteristics You will require the information on the type label to use the product safely and when seeking customer support from the SMA Service Line The type label must remain permanently attached to the product 10 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 4 Product Description Symbols on the Type Label Symbol Explanation Danger to life due to high voltages The product operates at high voltages All work on the product must be carried out by qualified persons only Risk of burns due to hot surfaces The product can get hot during operation Avoid contact during operation Allow the product to cool down sufficiently before carrying out any work Wear personal protective equipment such as safety gloves Observe the documentation Observe all documentation supplied with the product CE marking The product complies with the requirements of the applicable EU directives WEEE designation Do not dispose
27. m electric shock if the Combiner Box is damaged If the Combiner Box is damaged dangerous situations may arise during operation that result in death or serious injury from electric shock Only use the Combiner Box when it is in a technically faultless condition and safe to operate Regularly check the Combiner Box for visual damage Make sure that all external safety equipment is freely accessible at all times Make sure that all safety equipment is in good working order Installation Manual DC CMB IA U10 xx en 7 2 Safety SMA Solar Technology AG Danger to life from electric shock if the Combiner Box is left unlocked If the Combiner Box is unlocked unauthorized persons will have access to components carrying lethal voltages Touching live components can result in death or serious injury due to electric shock e Always lock the Combiner Box e Remove the keys from the door locks e Keep the keys in a safe place Risk of fire due to failure to observe torque specifications on live bolted connections Failure to follow the specified torques reduces the capacity of live bolted connections so that the contact resistances increase This can cause components to overheat and catch fire e Ensure that live bolted connections are always tightened with the exact torque specified in this document e When working on the device use suitable tools only e Avoid repeated tightening of live bolted connections as this may result in inadmissibly high torques
28. mpairs the duration and operation of parts inserted inside since the enclosure supports the correct dissipation of heat developed by the energy coming from the strings at a maximum temperature of 50 6096 with derating of 196 K of max current NOTICE The symbol indicates that the enclosure is constructed in such a way that it provides protection against indirect contacts via complete insulation EN 61439 2 For this purpose the electrical equipment must be correctly installed according to the instructions that accompany the product and using the special accessories screw cover caps mounting brackets Make sure the wall where the enclosure is to be mounted is suitable to support the weight The weight of these enclosure varies from 24 kg for the 16 string model to over 30 kg for the model with 32 strings 6 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 2 Safety 2 5 Safety Precautions This section contains safety precautions that must be observed at all times when working on or with the product To prevent personal injury and property damage and to ensure long term operation of the product read this section care fully and follow all safety precautions at all times DANGER Danger to life from electric shock due to live voltage High voltages are present in the live components of the Combiner Box Touching live components results in death or serious injury due to electric shock We
29. n Requirements Make sure that the inverter is switched off and disconnected on the DC side Make sure that the disconnecting switch of the combiner is set to OFF Make sure that the fuse box bases are open 28 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 7 Commissioning 7 Commissioning Measure the open circuit voltage of each string and check the following points maximum deviation between the voltages is less than 10 No values higher than the maximum permissible are measured No negative values are measured DANGER The fuses be inserted in the fuse boxes only if the previous tests have generated positive results Proceed with the start up operations of the system DANGER Immediately correct the wiring if one of the aforesaid conditions is not valid because continuation of this situation may cause serious damage to the system and people A DANGER The fuse holders are not suitable for isolating the on load string current Therefore these bases should only be opened if there is no passage of current main disconnecting switch OFF in order to prevent the creation of electrical arcs that are dangerous to the health and safety of people and the intactness of components Installation Manual DC CMB IA U 1 0 xx en 29 8 Maintenance SMA Solar Technology AG 8 Maintenance 8 1 Periodic Maintenance It is recommended to periodically inspect the panel and check th
30. n 3 If you are using bootlace ferrules mount the bootlace ferrules and crimp gas tight 4 Connect the string cables to the screw terminals of the fuse holders torque 2 5 Nm Ensure correct polarity 6 6 Connecting the DC Main Cables 6 6 1 Cable Requirements The Combiner Box comes supplied with busbars for connecting the DC cables with terminal lugs If you wish to connect the DC cables directly to the terminals the appropriate terminals are available as accessories Requirements for DC main cables and terminal lugs Use copper or aluminum cables only O Use only tin plated copper ring terminal lugs for copper cables or bimetal ring terminal lugs for aluminum cables L1 The width of the terminal lug contact surface must exceed the diameter of the washers 32 mm Requirements for DC main cables for direct connection to terminals which are available as accessories Use copper or aluminum cables only The conductor cross sections of the DC main cables must be selected correctly O The width of terminal lug must not exceed 45 mm Installation Manual DC CMB IA U10 xx en 25 6 Electrical Connection 6 7 Assembly of the Connection 6 7 1 Two Terminal Lugs Position B 8 A Designation Screw M12 Washer Tin plated copper busbar Fender washer Spring washer Nut M12 SMA Solar Technology AG Tin plated tube terminal lug 6 7 2 One Terminal Lug
31. nt Do not touch the contact surfaces after cleaning 4 Connect the DC main cables in accordance with the circuit diagram torque 60 Nm Ensure that you only use the supplied fastening material and connect a maximum of two adjacent DC main cables to each busbar 5 Secure the DC main cables to the cable support rail 6 8 Connecting the Grounding Cable In order to guarantee the function of the surge arrester it must be connected to the external grounding Cable requirement O Conductor cross section 16 mm to 35 mm Procedure 1 Strip 16 mm off the grounding cable insulation 2 Connect the grounding cable to the screw terminal of the surge arrester torque 2 5 Nm 3 Ensure that the grounding cable is securely clamped 4 Ground the grounding cable in the vicinity of the Combiner Box e g by means of a grounding electrode Installation Manual DC CMB IA U10 xx en 27 7 Commissioning SMA Solar Technology AG 7 Commissioning 7 1 Safety during Commissioning DANGER Danger to life from electric shock due to live voltage High voltages are present in the live components of the Combiner Box Touching live components results in death or serious injury due to electric shock Wear personal protective equipment when working on the Combiner Box Do not touch live components Before performing any work always disconnect the Combiner Box from voltage sources unless supply voltage is absolutely necessary Switch off the DC loa
32. pes Installation Manual SMA STRING COMBINER DC CMB U10 16 DC CMB U10 24 DC CMB U10 32 DC CMB IA U10 xx en 910 400 182GB Version 1 0 ENGLISH Legal Provisions SMA Solar Technology AG Legal Provisions The information contained in this document is the property of SMA Solar Technology AG Publishing its content either partially or in full requires the written permission of SMA Solar Technology AG Any internal company copying of the document for the purposes of evaluating the product or its correct implementation is allowed and does not require permission SMA Warranty You can download the current warranty conditions from the Internet at www SMA Solar com Trademarks All trademarks are recognized even if not explicitly identified as such A lack of identification does not mean that a product or symbol is not trademarked The BLUETOOTH word mark and logos are registered trademarks owned by Bluetooth SIG Inc and any use of these marks by SMA Solar Technology AG is under license Modbus is a registered trademark of Schneider Electric and is licensed by the Modbus Organization Inc QR Code is a registered trademark of DENSO WAVE INCORPORATED Phillips amp and Pozidriv amp are registered trademarks of Phillips Screw Company Torx is a registered trademark of Acument Global Technologies Inc SMA Solar Technology AG Sonnenallee 1 34266 Nie
33. stetal Germany Tel 49 561 9522 0 Fax 49 561 9522 100 www SMA de E mail info SMA de 2004 to 2014 SMA Solar Technology AG All rights reserved 2 DC CMB IA U10 xx en Installation Manual SMA Solar Technology AG 2 Table of Contents Table of Contents 1 Information on this Document PAK S 2 1 Intended MUI 5 2 2 Skills of Qualified Persons riale ete ete ate ete te d e eade 5 2 3 Instructions and Warnings eR E RA RARI 5 2 4 Position Grid securing LU REEL LM Rio I INI LI delie ali elia Lei uo i 6 2 5 Safety Precautions iL 6 3 Scope OF D lveti accelerare A Preduch Destnapioni anelli 4 1 Combiner Box DC CMB UI10 16 24 32 a eene iii 10 LEAN 10 4 3 DC Load Break e a n Redes et ta decies A A SHIN LO LU LL ni lalla iii nia cai 12 4 5 Overyvoltage Protection e ena ep i ii ei EE RARUS 12 LIN C lo C VO 5 1 Wall Mounting 5 1 2 Mounting the Combiner Box 5 2 Drilling Template for Mounting 6 Electrical Connecnon Gas cette pee e 18 1 ERREUR 18 6 2 Safety during Electrical Connection i ae ar
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