STRING BOX - AROS Solar Technology
Contents
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6. 10 SECONDS During operation when the strings from PV field are delivering the same current the LEDs will lit and unlit at the same time NOTICE if one or more strings are in alarm condition the corresponding led will flash with a 1Hz frequency DL15 led ACTIV indicates the normal operation of the board and flashes with a 2Hz frequency Page 30 of 32 OMNA137A55 GB Rev 01 STRING BOX TECHNICAL SPECIFICATIONS General Max input current Max output current Max voltage Input screws Output screws Protection level Operating temperature Insulation Protection 16 x 9A 144A 880Vdc 16 16 screw terminals 2 bar clamps IP65 20 45 2500Vac po
7. SIMS b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 15 2a 2b 3b 4a 4b 5a 5b 6b 7a 7b 8a 8b NEGATIVE STRING INPUT POSITIVE STRING INPUT string 1 94 4 94 4 string 2 WARNING If not all the inputs are used it s necessary to close all the cable holes with the supplied caps this ensures the level of protection designed OPERATION When all the connections are done and all the transparent security devices are set it s possible to close the output switch in order to connect the PV field to the inverter DANGER before to close the SW OUT output switch be sure that no operator is working on the cables connecting the String Box to the inverter also be sure that no short circuits are present When the PV field volta
8. DI DILDO DID
9. e The mounting surface must not be flammable e g wood e Although the equipment is designed for external environments it s necessary to protect it from direct sunlight otherwise the internal temperature could damage the components Do not install in places exposed to hot air Do not install in spaces too narrow these could obstruct the normal maintenance operations and the necessary air exchange e Leave an empty 30cm all around the equipment temperature of the installation environment must be within 20 45 C operating 20 60 C storage BEFORE YOU BEGIN When you receive the equipment verify that packaging is not damaged Pay attention when removing the packaging in order to avoid scratches The String Box must be handled with care any bumps and falls could damage the equipment This manual is provided with the String Box The manual must be carefully preserved and must be examined before any operation on the equipment Packing list e String Box e This manual e Wall mounting installation kit 4 wall mounting accessories and 4 screws 20 caps for cable gland kit M16 e Additional complete cable gland kits 6xM16 2xM32 OMNA137A55 GB Rev 01 Page 11 of 32 DIMENSIONS AND WEIGHT 009 Bottom view Q A OG 090 Front view Dimensions in mm The String Box standard configuration weight is 27 Kg 59 52 Ib Page 12 of 32 OMNA137A55 GB Rev 0
10. alarm situations An example of configuration change is also shown Example 1 The currents measured are ch1 ch2 ch3 ch4 ch5 ch6 ch7 ch8 Imax 20 CORRENTE A chi ch3 ch4 ch5 ch6 ch8 The maximum current is 13 9A tolerance is 20 so the alarm threshold is 11 1A In this example all the current are above this threshold so no alarm is present Example 2 The currents measured are Imax 2096 CORRENTE A chi ch3 ch4 ch5 ch6 ch8 The channel ch3 has a current below the threshold If this condition lasts for a time greater than TIME ALL parameter the alarm condition for that string is set OMNA137A55 GB 01 Page 27 of 32 Example 3 The currents measured are i 10 CORRENTE A O N c MIN chi ch3 ch4 ch5 ch6 ch7 ch8 In this case the maximum current is less than MIN percentage of scale 10 of 20A 24 With these values the comparison between the strings is not performed In any case after two days of this situation the alarm of null current persistence is set Customizations Using the configuration software it s possible to modify a set of parameters on the String Box In detail other than the former three parameters TOLL TIME ALL and MIN it s possible to change Daily and Yearly time masks These masks have the purpose to disable monitoring during the day in those moments when it s shady on the strings It s pos
11. microprocessor card inside the String Box card locate the SW1 dip switch bank numbered from 1 to 8 Warning the correct numbering is always in the serigraphy on the card Dip switch bank Setthe correct address using binary encoding o5 6 7 Vaue 1 2 4 8 16 32 The real address is the sum of all values set to ON position so if you set to ON the dip switches 1 and 4 the String Box address is 9 This address is used for all the communication ports RS485 RS232 and SLOT and for both Sunvision and Modbus protocol The valid addresses range from 1 just switch 1 to on to 127 all switches from 1 to 7 ON NOTE The switch 8 is reserved for future use Page 20 0f 32 OMNA137A55 GB Rev 01 MEASURES AND ALERTS INPUTS AND OUTPUTS The String Box has some analog inputs to connect external sensors Specifically available e Two 2 PT100 analog inputs with 2 or 3 wire connection J9 connector These inputs are galvanically isolated respect to the card s electronic e One 1 4 20 mA analog input J7 connector This input is galvanically isolated and can be configured by software e One 1 0 10V analog input J7 connector This input is galvanically isolated and can be configured by software the default configuration is for a solar radiation sensor in range 0 1200W m For convenience there is a 12Vdc on the same connector for the power of the solar radiation sensor In the
12. operation must have date and time the nature of the operation name of the operator and all the useful information When all the maintenance operations are over a careful check must be done in order to do not forget any tool or extraneous material inside the equipment e Incase of faults or malfunctions the local dealer or the manufacturer must be contacted only qualified technicians can do the necessary repair operations It s exhaustively forbidden to wash the electrical parts inside or outside the equipment Both storage and installation places must respect the environmental requirements reported in this manual CE Marking The equipment described in this manual adheres to the following directives LV Directive 2006 95 EC EMC Directive 2004 108 EC The reproduction of any part of this manual is forbidden even if partial unless authorized by manufacturer The manufacturer reserves the right to modify the described product in any moment without notice OMNA137A55 GB Rev 01 Page 7 of 32 Summary DESCRIPTION OF EQUIPMENT AEE 9 CONFIGURATION SOFTWARE unas add ais 10 INSTALLATION T AA 11 DEFORE YOU ee T 11 DIMENSIONS AND WEHT sra 12 WAEE MOUNT OET E E O 13 INPUT AND OUTPUT aiie ti a E 14 Ground CONTEO Imm 14 PV FIBI COI ONS aaa 14 392 CODES CONNECTION mm 14 Communication and power cables connection 14 GROUND CONNECTI
13. 1 WALL MOUNTING The String Box can be wall mounted The wall mounting kit is composed by 4 rods and the necessary screws WARNING All the mounting rods and screws must be used The wall mounting screws are not A included in the kit and should be chosen depending on the wall solidity WALL DRILES Dimension in mm 845 OMNA137A55 GB Rev 01 Page 13 of 32 INPUTS AND OUTPUTS All the input and output cables must be connected using the lower part of the String Box Negative output Negative string input Positive string input Positive output O O O a O Z OQ O O 7 O 22 N Q Q 900 C AS 1 Ot OOO Ground cable Communication cables In detail the following connections are available Ground connection To connect the ground cable use the cable gland capable to accept cables with external diameter from 5 up to 12 mm Internally the ground cable can be fastened to the M8 screw so the cable should be prepared with a suitable crimp loop PV Field connections For the string connections the equipment has 2x16 cable glands 16 for positive 16 for negative for cables with diameter from 4 up to 10 mm The maximum section for the cables connectable to the internal connections is 16 mm If some inputs are not us
14. ON currada 15 POWER SUPPLY ee 16 COMMUNICATION Sisa da 18 2 Wire connection with screw connectors id 19 4 wire connection with screw CONNECCOSS cccccceeccceecccecccccecscuecsceecssuecsceuessueesssecsueeseecessecessceeesscecueesscessuecsaeess 19 RAS CONNECTION DINOU n 19 Opona SLOT CONDECION MN 19 STRING BOX ADDRESS conri osito nieto 20 MEASURES AND ALERTS INPUTS AND OUTPUTS 21 22 Analog cmt 22 2 20 E en Ip FEM CP IM aU RU NN ee RUN Ma E 22 0 10 23 Boed IO INPUTS sees 24 DG OEE DUS A O E 24 INVERTER CONNECTIO Norma andan 25 STRING CONNECTIONS teh as aUa ERR ERA FRE ES REA Einicio 25 OPERATION sesos 26 REPETI TTE 26 EXCITE INS ito 28 Daily and Year ime masko iaa 28 Weight of the measuring 28 30 STRING BOX TECHNICAL SPECIFICATIONS E CO ta TEN Co Ya
15. OUT2 e RL OUT2 is related to ALL the available alarms DC Voltage Vdc 300 200 100 20 recommended String alarms Null current persistence Overvoltage discharger in alarm Power supply voltage alarm Isolated digital input 1 Isolated digital input 2 Real time clock alarm Internal memory alarm Analog voltage reference alarm Calibration error Auxiliary contact closed Link alarm application range 0 1 02 0 5 1 2 5 DC current A Page 24 of 32 this figure shows the relays in a not excited state Using the configuration software is possible to assign a specific alarm to one or both the relays See software manual for details The default configuration is the following RL OUT1 is related to the OR of the following alarms String alarms Null current persistence Overvoltage discharger in alarm RELAYS MAXIMUM LOAD The graph we report here shows the maximum load current that the relay can bear in relation to the applied voltage For example with an applied voltage of 30V the maximum current is 2A whereas with 200V the maximum current is 0 3A OMNA137A55 GB Rev 01 INVERTER CONNECTION The power cables going to the inverter must be connected on the bar screws of the DIN rail front side of the String Box The polarities indicated must be respected See the large picture located on the inner side of the front door For each polarity an M8 pin is available two cabl
16. RIELLO ELETTRONICA yl A SOLAR TECHNOLOGY SIRING BOX Connection Box amp Monitoring Page 2 0132 OMNA137A55 GB Rev 01 Installation and user manual RPS SpA via Somalia 20 20032 Cormano MI Tel 39 02 66327 1 Fax 39 02 66327 231 www aros solar com The reproduction of any part of this manual is forbidden even if partial unless authorized by manufacturer The manufacturer reserves the right to modify the described product in any moment without notice OMNA137A55 GB Rev 01 Page 3 of 32 ICONS DANGER This icon warns you about a procedure that if not A correctly executed can lead to serious accident or death WARNING This icon warns you about a procedure that if not correctly executed can lead to damage to the equipment NOTICE This icon indicates important info about the ker equipment Individual Safety Equipment During maintenance operations is forbidden to operate without Individual Safety Equipment indicated below The installation or maintenance personnel must NOT wear garments with wide sleeves laces belts bracelets or other dangerous garments especially if metallic Any long hair must be collected in order to not to be a danger The following icons represent the individual safety equipment to be worn The equipment should be determined and chosen in relation to the kind of danger especially the electric one to be faced Accident prevention footwear Protective goggles Use ALWAYS Us
17. S LIVE the operators and the technicians must be adequately trained on operations on ELECTRICAL CIRCUITS ALWAYS LIVE and must always wear INDIVIDUAL SAFETY EQUIPMENT e Inside the equipment are always present dangerous voltages even with the switch in open position In order to safely access the equipment disconnect all the strings coming from the PV array always wearing the individual safety equipment The technician must strictly follow the indications related to the installation and maintenance of the equipment e Always use insulated tools e Always use individual safety equipment e Respect the polarity f necessary substitute the fuses using same type e Always follow the local existing legislation in order to correctly dispose the removed parts Do not deactivate security devices do not ignore alarms and warnings being these described into this manual or highlighted with plates or labels on or within the equipment Promptly substitute the security warning plates or labels when unreadable Use the equipment with mounted protections and the front door closed During maintenance of the equipment never remove at the same time both transparent protections on the power boards Page 6 32 OMNA137A55 GB Rev 01 modify manipulate or in any way change structure of the equipment is in any case forbidden without manufacturer s authorization All the maintenance operations must be written on a special logbook any
18. e ALWAYS Aia Helmet x Use in case of presence of suspended Use ALWAYS p p loads Insulated protective gloves Use ALWAYS Definition of operators and technicians The personnel doing ordinary maintenance on the equipment are defined as operators These personnel are aware about operating and maintenance modes of the equipment These personnel must have the following requirements He she has done a training to be enabled to operate according to current safety standards in relation to the electrical shock danger He she has done training on Individual Safety Garments and on basic First Aid The personnel intended to install first activation and to possible extraordinary maintenance are defined to be technicians These personnel must possess the 5 requisites and moreover He she must be trained by the manufacturer or by a deputy He she must know the installation assembly repair and service modes he she must also have a specific technical qualification In general he she has done a technical or specific training on use and security maintenance of the equipment Page 4of 32 OMNA137A55 GB Rev 01 ZN Emergency Actions General information follows First Aid Follow corporate regulations and traditional first aid procedures Fire Fighting Measures Don t use water for fire fighting but only fire extinguishers especially made for electrical and electronic equipments Some equipment when
19. ed close the cable glands with the caps supplied with the String Box Output cables connection To connect the String Box to the inverter there are two cable glands indicated as Positive output and Negative output for cables with external diameter from 11 to 21 mm Internally the cables can be fastened to the M8 screws so the cables should be prepared with suitable crimp loops Two more cable glands are supplied for those installations where two parallel cables for each polarity are needed See the following figure for a correct drilling in this case The diameter of the drill hole to install the cable glands is 32 mm Communication and power cables connection There are 3 cable glands on the String Box that must be used for the communication cables for the environment sensors and for the auxiliary power optional The external diameter for these cables must be within 4 to 10 mm If needed it s possible to drill the bottom side of the String Box to increase the number of cables to connect See the following figure for a correct drilling in this case The diameter of the drill hole to install the cable glands is 16 mm Page 14 of 32 OMNA137A55 GB Rev 01 Optional cable glands placement GROUND CONNECTION DANGER The very first connection to be made on String is the ground cable Apart from security reasons this connection grants the proper operation of the overvoltage dischargers within the equipment For thi
20. es of max 95mm can be connected using the correct lug with hole always live Any operation on the String Box should be performed by a qualified technician only these personnel must be adequately trained to operate on circuits ALWAYS LIVE they must wear the proper INDIVIDUAL SAFETY EQUIPMENT DOUBLE CHECK THE POLARITY OF THE CONNECTIONS IN ORDER TO AVOID EQUIPMENT PV PANELS AND INVERTER DAMAGE A DANGER This equipment has internal parts always connected to the PV field and or inverter Box equipments more than one String Box can be connected to the same inverter Before to operate on such cables always open the switches of the other String Box equipments and the switches of the inverter ALWAYS verify that no dangerous voltages are present on the operated parts a digital multimeter with proper full scale can be used for this purpose STRING CONNECTIONS The String Box has 8 independent measure channels with 18A maximum current each channel is protected by a 900V 20A fuse To each channel is possible to connect two cables typically two strings of the PV field For each polarity of the input strings a unipolar cable with diameter from 4 to 10mm must be used The cable terminals are compatible with cables with section between 0 75 mm and 16 mm DANGER This equipment has internal parts always connected the PV field and or inverter DANGER The cables bringing power to the inverter be LIVE if connected to other Str
21. following figure the two connectors J7 and J9 are highlighted they are located on the microprocessor card tiri a fier 00 Fool toad la Ey ost 0 05 mou on wl gt 5 OMNA137A55 GB 01 Page 21 of 32 PT100 input The PT100 sensor connection to the J9 connector can be done in 2 or 3 wire configuration this ensures greater accuracy in measuring the temperature compensating the voltage drop The two configurations can be chosen using the jumpers located close to J9 connector as the following figure shows PTIOO 3 WIRE CONNECTION PTIOO 2 WIRE CONNECTION PTI 00 PTI 00 PTI 00 PTI 00 Mixed configurations are allowed one channel configured as a 2 wire the other one as a 3 wire Analog inputs Two generic analog inputs re present J7 connector one is suitable for voltages between 0 and 10V the other one allows 4 20 mA transducers to be connected The values acquired are transformed by the String Box into physical quantities The configuration of such transformation is possible using the Configuration and monitoring software see the software manual ANALOG INPUT 4 20 mA input This configurable input by default will show 4 mA with 4 mA of input current and 20 mA with 20 mA input current With the software this input can be fully re configured see software manual for details Page 22 of 32 OMNA137A55 GB Rev 01 0 10V input For an easy cable connection the 0 10V in
22. ge is above 200 Vdc or when auxiliary power is used the equipment is powered and the string monitoring is started Default configuration By default the String Box monitors all the inputs with the same number of strings Moreover the strings have all the same current features the same exposure and shading By default the String Box monitors from 6 00 to 21 59 of every day of the year Three key monitoring parameters are defined e Tolerance percentage TOLL is the maximum percentage of deviation of a measuring channel respect to the channel with maximum current beyond which an alarm condition arises The default value is 20 e Intervention time TIME_ALL is the time in seconds for which the alarm condition must persist before it is actually generated and sent to the remote control The same interval time is applied when there is a return from alarm condition e Minimum intervention threshold percentage MIN is the percentage of current below which the comparison between the strings is not performed if the current value of the maximum current string is below this value the monitoring is not performed After two days in this null current Page 26 of 32 OMNA137A55 GB Rev 01 condition an alarm is generated null current persistence The default value is set to 10 of the scale In the following examples we simulate the connection of 16 strings to the String Box different possible situations are showed normal operation
23. he screw connectors or the RJ45 connectors all the connectors are connected in parallel so any combination of two in and out can be chosen See the following pictures for the two or four wires 485 connections 2 wire connection with screw connectors A A A N C eee T Pin2 A Transmit l Pin2 Pin3 A Transmit 1 Pin3 A E Pin4 N C Pin4 N C Pin5 N C x a ELEC Pin5 N C RU UT GND Notice verify the jumper settings 4 wire connection with screw connectors Pin2 Transmit Pin3 T Transmit Pin4 R Receive Pin5 R Receive Notice verify the jumper settings RJ45 connector pinout E AAA Optional SLOT connection The String Box offers an additional expansion slot in order to use optional communication cards See proper communication card documentation for a detailed explanation WARNING In order to avoid damage to equipment and communication card use cards specifically designed for use in conjunction with the String Box OMNA137A55 GB 01 Page 19 of 32 STRING BOX ADDRESS The String Box address can be configured using the SW1 dip switch Equipments on the same bus must not have the same address so it s necessary to verify that also the inverters connected on the same RS485 bus have all different addresses To change the address of the String Box use the following procedure e Locate the
24. hi ch3 ch4 ch5 ch6 ch7 ch8 The threshold for channel 6 15 5090 compared to the others and so the condition is of normal operation NOTICE If a channel has no strings connected the weight should be set to 0 to exclude that channel from monitoring Alternatively you can set all the hourly masks of that channel to be unchecked to have the same result OMNA137A55 GB Rev 01 Page 29 of 32 LED behavior On the microprocessor board there 15 set of led this set allows having a prompt visual feedback 8 String currents The led corresponding to a channel stays lit for a time proportional to the measured current so a measured null current is indicated by a led always off a current to full scale 20A is indicated by a led always lit while a current of 10A 5096 makes its led lit for 5 seconds and off for the remaining 5 seconds So the led flash with a period of 10 seconds and the duty cycle lit time unlit time is equal to the measured current in relation to the full scale In the following figure there is a sample timeline representing led lit unlit the 8 channels of the sample String Box have different current and in the same figure there is the correspondence between each led and the measuring channel So LED DL4 is channel CH1 LED DL5 is channel and so on CT
25. in fire can release toxic fumes into the atmosphere during fire fighting always use a respirator OMNA137A55 GB Rev 01 Page 5of 32 Thank you for choosing our product AROS is specialized in the development and production of equipments for statically converting energy The String Box is a high quality product carefully designed and constructed to ensure the best performance GENERAL WARNINGS This manual contains the description of the use installation and startup of the String Box Read carefully this manual before installation or use Due to the information contained about use of the equipment the manual must be preserved with care it must be examined before any operation on the equipment itself Operating Instructions This equipment is intended for professional use only in industrial or commercial environments The relay connections must be done with shielded electrical wire Warning This product is intended for sale to professional installers only In order to prevent electrical noise some installation restrictions or additional devices are possible SECURITY RECOMMENDATIONS TO FOLLOW DURING INSTALLATION AND USE OF THE EQUIPMENT e The very first thing to do is to connect the ground wire to the clamp with the symbol e The equipment must NOT operate without ground connection e The equipment must be installed and used according to the instructions contained into this manual e The equipment has ELECRICAL PARTS ALWAY
26. ing always live Any operation on the String Box should be performed by a qualified technician only these personnel must be adequately trained to operate on circuits ALWAYS LIVE they must wear the proper INDIVIDUAL SAFETY EQUIPMENT DOUBLE CHECK THE POLARITY OF THE CONNECTIONS IN ORDER TO AVOID EQUIPMENT PV PANELS AND INVERTER DAMAGE The cable terminals for the strings of the PV field have connectors that can be detached from the power board in order to help the connection isolation of one or more strings to from String Box DANGER When a cable terminal must be connected disconnected to from the power board the current must be NULL Before to connect disconnect a cable terminal on from power board double check that the inverter is off and that output switch of the String Box is open WARNING The positive and negative string terminals must be connected carefully respecting the polarity to the cable terminals on the two power boards When connecting the cables always respect the cable terminals numeration e g connect the positive of string 1 to the cable terminal 1a of the positive board and connect the negative of the same string to the cable terminal 1a of the negative board OMNA137A55 GB Rev 01 Page 25 of 32
27. ment Page 16 of 32 OMNA137A55 GB Rev 01 Output 0 1 0 vdc input 230Vac input 004 Phase Neutral MOP Negative Positive Output Output Terminals for auxiliary 230 Vac power supply WARNING The auxiliary power input is protected by a 4A fuse F1 10x38mm If it s necessary to replace the fuse use one with the same kind OMNA137A55 GB Rev 01 Page 17 of 32 COMMUNICATIONS The String Box has many connection options These connections are available into the microprocessor board or control board located at the upper side of the equipment In the following picture there is a view of the board and the possible connections E A E mii AA m LE E elas Hr o etary The RS232 port is a female DB9 connector this connector allows a single point to point connection of a pc with the String Box and it allows configuration and monitoring The connection cable is a standard RS232 DB9 cable The RS485 port allows the String Box to be connected to a communication bus where more equipments and inverters can be present In order to make this connection work properly see the following picture Page 18 of 32 OMNA137A55 GB Rev 01 2 wire connection 2 wire connection 4 wire connection 4 wire connection without termination with termination without termination with termination JP5 JP5 JP6 JP8 JP6 JP8 JPT The RS485 connection can be done using t
28. o sis 31 Page 8 of 32 OMNA137A55 GB Rev 01 DESCRIPTION OF EQUIPMENT th optional contact 5485 k h5232 Lr 2 se Em m o SS A lt lt lt lt SS SS POWER CONTROL SUPPLY UNIT Tp mx Temperature y Irradiation 4 20mA sensor AUX 230Vac power supply Contact optional PV Field STRING BOX general scheme and main connections available OMNA137A55 GB Rev 01 Page 9 of 32 The String Box is equipment that allows the parallel connections of the strings of a PV field at the same time the String Box protects the strings with a fuse A sophisticated monitoring system within the String Box checks the status of any measure channel The key features of the String Box are e Parallel connection of up to 16 strings by 9A each 8 channels e Local and remote indication of status and alarm conditions e RS232 and RS485 connections e One SLOT connection for expanding communication e g Ethernet board e Proprietary communication protocol and MODBUS RTU both available on all the communication ports no configuration necessary hot swap e Wide configurability of the monitoring parameters using the available soft
29. put is located directly on the DIN mounted screws 1124 Output 0 0 Positive 0 10V input and 12Vdc output Output Output In the default configuration this input is configured as a solar radiation sensor in range 0 1200W m See software manual for details Close to the 0 10V input there is also an auxiliary 12Vdc that can be used for the power of the radiation sensor NOTICE The 0 10V input is galvanically isolated respect to the rest of the card s electronics and to the 12V available on the screws In order to allow correct operation of the solar radiation sensor is necessary to shorten the power negative and the negative of 0 10 OMNA137A55 GB Rev 01 Page 23 of 32 Isolated digital inputs DIGITAL INPUT RL OUTI b oe A A Co T Z Aa Z N Z E On J5 connector of the CPU card two digital isolated inputs are available The status of these inputs is checked by the String Box and can be associated to an alarm The default behavior the alarm is generated when this input is closed but using the configuration software this can be changed see flag inverted logic This can be done for each input independently Digital outputs relays FREE CONTACT OUTPUT On J4 connector of the CPU card two free contacts relays are 74 available See the figure to see position of the contacts NC COM NA NC COM NA RL
30. s purpose a ground cable with minimal 25 mm section must be connected to the correct screw see below Ground cable Connection OMNA137A55 GB Rev 01 Page 15 of 32 POWER SUPPLY The String Box needs a power supply in order to evaluate measures and to communicate This power supply can be provided by the PV field or optionally by an auxiliary 230Vac 20 In the factory configuration the String Box is configured to be supplied from the PV field if PV field voltage is greater than 200 Vdc In order to use the auxiliary power supply apply the following procedure DANGER Follow this procedure BEFORE connecting the PV field and the auxiliary power supply to the String Box e Verify that the output switch SW OUT is in the OPEN position e With a multimeter verify that no dangerous residual voltages are present on the positive and negative terminals e Locate the power supply board inside the String Box and remove the transparent security cover See picture below where you see the default configuration e Disconnect the cables connected to J1 and J2 and swap positions as shown in the second picture e Restore the transparent security cover e Apply 230 Vac on the terminals on the DIN bar as indicated in the third figure J1 connector Red amp black Bc J2 connector Blue amp black 1 connector Blue amp black J2 connector Red amp black Auxiliary 230 Vac powers the equip
31. sible to divide the year in two parts defining the starting date of each part to allow different behavior in monitoring For each of the two parts of the year is possible to define an hourly based time mask ranging from 6 00 to 22 00 21 59 59 NOTICE Please refer to the user s manual of the software for more details on the daily and yearly masks Weight of the measuring channel Using the configuration software it s possible to change the weight for each measuring channel This parameter has to be changed when a different number of strings or when strings with a different nominal current are connected to some channel By default all the channels have a weight of 100 Setting a weight of 50 for a certain channel the String Box knows that on that particular channel a current of about one half than normal is expected during normal operation This is a typical example of a channel with one string while two strings are connected to the other channels With this parameter it s possible to monitor different channels with different nominal currents that would go into alarm condition if directly compared This is just an example for each channel the weight can range from 10 to 100 Page 28 of 32 OMNA137A55 GB Rev 01 NOTICE Please refer to user s manual of the software for more details on the weight of the channels Example Channel 6 has weight 50 the others 100 Imax 20 Imax 2 20 CORRENTE A c
32. ware e Local history log of alarms and status e Protection fuses for each couple of inputs 900Vdc on positive and negative e For each input is possible to connect wires up to 16mm e Output switch with optional release coil used for inverter detachment e Monitored discharger used against over voltage situations protected against over currents easy to restore thanks to removable cartridges e Direct input power from PV field or from auxiliary e Insulated digital inputs for local monitoring e Insulated analog inputs for environmental sensors 2xPT100 0 10 4 20mA e Configurable digital outputs with free contacts e P65 protection degree for external environment CONFIGURATION SOFTWARE This manual refers to String Box configuration software this software is not provided with the equipment but is downloadable from the manufacturer s web site or from the following site in the Photovoltaic Section htto www aros it The software is available for Windows only within the same page is possible to download the software manual in pdf format Page 10of 32 OMNA137A55 GB Rev 01 INSTALLATION PLACE The String Box equipment has been designed for external installation For the installation choice read the following notes e The String Box must be installed with wire connection side facedown e The String Box can be wall mounted using the accessories provided Be sure the wall chosen is able to withstand the weight
33. wer control Overvoltage discharger General output switch String fuse Auxiliary power fuse Type 2 1000V max total 8 2015 12 5KA nominal 8 20us 25 max 8 20us 3 varistors configuration Self protected with fuse Monitored 4x125A 2 poles in parallel 20A 900Vdc 10x38 500Vac 10x38 Alarms String alarms Null current persistence alarm Overvoltage discharger alarm Isolated digital input 1 status Isolated digital input 2 status Power supply voltage alarm Real time clock alarm Internal memory alarm Link alarm no connection to power board Calibration error Auxiliary contact closed tamper OMNA137A55 GB Rev 01 Page 31 of 32 Communications Standard 1 x RS232 DB9 female 1 x RS485 RJ45 screws expansion communication slot Speed 9600 bps Insulation 2500Vac x 1 minute 232 e 485 Slot NOT insulated Addressing From 1 to 127 dip switch selection Output relays Number of relays 2 Contact Exchange potential free max 2A max 220Vdc 250Vac max 60W 62 5VA resistance 35 mQ Insulation 1000 Vac Mechanical properties Dimensions Ixhxp mm 600x840x300 mm Weight 27Kg 59 52 Ib Page 32 of 32 OMNA137A55 GB Rev 01
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