Fronius String Control 250/25 42,0426,0082,EA 012010 USA Operating Instructions Data Communication
Dear Fronius Customer, Introduction Thank you for choosing Fronius - and congratulations on your new, high-quality, hightech Fronius product. This introduction should provide you with general information about the equipment. Please read it carefully to learn about the many great features of your new Fronius product. This is the best way to get the most out of all the advantages that it has to offer. Please also note the safety information and the safety precautions for the product installation location.
ud_fr_st_et_01382 012008
IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS General This manual contains important instructions for the Fronius String Control 250/25, that must be followed during installation and maintenance. The Fronius String Control 250/25 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 Fronius String Control 250/25.
Safety Instructions DANGER! WARNING! CAUTION! “DANGER!“ indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. “WARNING!“ indicates a potentially hazardous situation which, if not avoided, will result in death or serious injury. “CAUTION!“ indicates a potentially harmful situation which, if not avoided, may result in minor and moderate injury or property damage.
General (continued) For information about where the safety instructions and warning signs are located on the equipment, please refer to the “General“ section of your equipment’s operating instructions. Any equipment malfunctions which might impair safety must be remedied immediately before the device is turned on. Your safety is at stake. Intended Use The equipment may only be operated in compliance with its intended use. Any other purpose does not constitute intended use.
Safety Precautions at Equipment Location Information on Noise Emission Values When installing devices with air vents, make sure that cool air can flow freely through the vents unobstructed. The device should only be operated in accordance with the protection class listed on the rating plate. The inverter generates a maximum sound power level of <80dB(A) (ref. 1pW) at full-load operation according to IEC 62109-1.
Electrical Installations Electrical installations may only be carried out in accordance with relevant national and local standards and regulations. ESD Precautions Danger of damage to electronic components due to electrostatic discharge. Take appropriate ESD precautions when replacing and installing components. Safety Precautions in NormalOperation The device should only be operated when all safety equipment is fully functional.
Contents General .............................................................................................................................. 3 Functional Principle ....................................................................................................... 3 Other System Requirements.......................................................................................... 3 Device Concept ..........................................................................................................
Criteria for the Proper Selection of String Fuses .............................................................. General ........................................................................................................................ Criteria for the Proper Selection of String Fuses ......................................................... Effects of Using Underrated Fuses .............................................................................. Fuse Recommendations - Application Example ......
General Device Concept The Fronius String Control 250/25 is designed for use in grid-connected photovoltaic systems with several solar module strings. Fronius String Control 250/25 (open) Up to 25 solar module strings can be integrated at the input of the Fronius String Control 250/25 to reduce these at the output to one DC+ and DC- main line. The Fronius String Control 250/25 monitors the incoming solar module strings to detect errors in the solar module field.
Intended Use The device is intended solely for use as a collector and measuring device for the solar module DC strings. The device may be operated only with the following inverters: - Fronius CL 33.3 DELTA / 44.4 DELTA / 55.5 DELTA - Fronius CL 36.0 WYE 277 / 48.0 WYE 277 / 60.0 WYE 277 Any other purpose does not constitute intended use. The manufacturer shall not be liable for any damage resulting from such improper use. Intended use also includes following all information from the operating instructions.
Product Description Safety Fronius String Control 250/25 - Housing WARNING! Operating the device incorrectly can cause serious injury and damage.
Fronius String Control 250/25 - Connection Area (15)(14) (1) (13) (2) (3) (12) (4) (5) (6) (11) (7) (10) (8) (9) Item Description (1) Address switches (2) Measuring channel 5 (3) Measuring channel 4 (4) Measuring channel 3 (5) 25 Terminals with fuse holders for DC cable ‘IN’ cable cross section AWG 14 - AWG 8 (6) Measuring channel 2 (7) Measuring channel 1 (8) Connection 2 x M12 for DC cables ‘OUT’ (9) Connection 2 x M12 for DC cables ‘OUT’ (10) Connection 2 x M12 for grounding
Fronius String Control 250/25 - Connection Area (continued) Item Description (14) 2 RJ 45 connections for data communication cable (15) Connection for external 12 V DC power supply 7
Fronius String Control 250/25 Installation Wall anchors and Screws Depending on the surface, different wall anchors and screws may be required for installing the Fronius String Control 250/25. Therefore, these wall anchors and screws are not included with the Fronius String Control 250/25. The installer is responsible for selecting the proper wall anchors and screws. Recommended Screws for Mounting In most cases, you should use 1/4 in. or 5/16 in.
Attaching the Fronius String Control 250/25 to a Concrete or Brick Wall 1 2 1 1 2 2 3 3 4 4 5 5 3 4x 1 3 2 4 5 Attaching the Fronius String Control 250/25 to a Wooden Wall 1 2 1 1 1 2 2 3 9
Attaching the Fronius String Control 250/25 to a Metal Carrier 1 1 4x 2 3 4 10
Knocking out Cable Input Openings and Mounting Conduits on the Fonius String Control 250/25 General Required cable input openings have to be knocked out of the Fronius String Control 250/25 housing with a proper knock out tool. Take care that safety notes and rating plates located on the housing are not damaged when knocking out cable input openings. Cable Input Areas Generally cables can be lead into the Fronius String Control 250/25 from below or sidwise.
Maximum Conduit Size The Fronius String Control 250/25 is dimensioned for a maximum conduit size of 4 in. Recommendation for Inserting Cables Fronius recommends inserting all cables from below into the Fronius String Control 250/25. The following working steps refer to inserting cables from below. Connecting sidewise inserted cables is similar and will not be described in these operating instructions.
Knocking out Cabel Input Openings on the Fonius String Control 250/25 CAUTION! Danger of short circuit by loose metal parts from knockouts. Loose metal parts in the Fronius String Control 250/ 25 may cause short circuits when the Fronius String Control 250/25 is powered up. When removing knockouts, make sure that: - no loose metal parts fall into the fronius string Control 250/ 25 - any metal pieces that do fall into the Fronius String Control 250/25 are removed immediately 3/4 in. DATCOM 3 in. 3 in.
Connecting Solar Module Strings to the Fronius String Control 250/25 General Information About Solar Modules In order to select suitable solar modules and get the most efficient use out of the inverter, please note the following points: - - Safety The open circuit voltage of the solar modules increases at constant irradiance and when temperature decreases.
Safety (continued) To ensure problem-free DC cable connections to the terminals, all DC cables inside the Fronius String Control 250/25 must have a certain minimum length. Depending on which side the DC cables are inserted from into the Fronius String Control 250/25, different minimum lengths of the DC cables are needed. 3.90 in. 101 mm 99 mm 15 20.08 in. 306 mm 25.47 in. 647 mm 7.83 in. 199 mm 3.98 in. 12.05 in.
Notes for Connecting Solar Module Strings to the Fronius String Control 250/25 NOTE! Connecting the DC wiring with the wrong polarity may cause damage to the Fronius String Control 250/25. Check both the polarity and the open circuit voltage. The DC Voltage must not exceed 600 V, regardless of temperature. NOTE! When connecting fewer than 25 solar module strings, we recommend assigning an equal number of DC cables to the measuring channels as much as possible.
Connecting Solar Module Strings to the Fronius String Control 250/25 (continued) 3 Tightening torque 1.48 ft lb. 3 2 4 0.39 in. 10 mm 1 NOTE! Form a min. 4 in. wire loop using all wires.
Connecting the Fronius String Control 250/25 to the Inverter Safety WARNING! An electrical shock can be fatal. Danger from DC voltage from solar modules. - Make sure that the input and output sides in front of the device are not charged before connecting anything. - Any and all connections should only be carried out by qualified electricians. - Follow the safety rules in these operating instructions. WARNING! An electric shock can be fatal.
Safety (continued) Consider the maximum inverter current, when sizing the DC cables ‘OUT’. For the required cable cross section you can also use 2 cables. In this case the cable cross section of both cables should be approximately of the same size. CAUTION! Danger of damaging the Fronius String Control 250/ 25 from improperly connected terminals. Improperly connected terminals can cause thermal damage to the Fronius String Control 250/25 and may cause a fire.
Connecting DC Cable ‘OUT’ to the Fronius String Control 250/25 2 1 3 4 2x 3 2 4 2x 2 1 1 Tightening torque 10.33 - 22.87 lb ft. Tightening torque 10.33 - 22.87 lb ft. NOTE! Label the DC cables ‘OUT’ according to their designated polarity. 3 3 5 2x 2 1 1 2 1 Tightening torque 10.33 - 22.87 lb ft. 2 1 2 * Connection of 1 or 2 cables per DC output * Important! When connecting 2 cables with a 2-hole cable lug consider, that both cable lugs may only be put together on their flat side.
Connecting the Fronius String Control 250/25 to the Inverter 1. 1 Connect the DC cable ‘OUT’ to the inverter as per the inverter operating instructions. NOTE! Note the following points when connecting: - String fuses must always be in the ungrounded conductor - Connect the DC cable ‘OUT’ to the inverter with the correct polarity. NOTE! Connecting the DC wiring with the wrong polarity may cause damage to the inverter. Check both the polarity and the open circuit voltage.
Criteria for the Proper Selection of String Fuses General The use of string fuses in the Fronius String Control 250/25 also adds fuse protection to the solar modules. A crucial factor for the fuse protection of solar modules is the maximum short circuit current ISC of the respective solar module. Criteria for the Proper Selection of String Fuses The following criteria must be fulfilled for each solar module string when using fuse protection: - IN > 1.56 x ISC - IN < 2.00 x ISC - VN ≥ max.
Fuses Nominal current value Fuse Nominal current value Fuse 4.0 A KLK D 4 9.0 A KLK D 9 5.0 A KLK D 5 10.0 A KLK D 10 6.0 A KLK D 6 12.0 A KLK D 12 7.0 A KLK D 7 15.0 A KLK D 15 8.0 A KLK D 8 20.0 A KLK D 20 ‘Fuses’ table: Excerpt of suitable fuses, e.g.
Inserting String Fuses Safety Selecting String Fuses WARNING! An electrical shock can be fatal. Danger from DC voltage from solar modules. - Make sure that the input and output sides in front of the device are not charged before connecting anything. - Any and all connections should only be carried out by qualified electricians. - Follow the safety rules in these operating instructions.
Connecting Data Communication Cables to the Fronius String Control 250/25 Connection Options There are two options for connecting the Fronius String Control 250/25 to Solar Net: - Via connection-ready data communication cables with RJ 45 plugs Recommended cable size: CAT 5 - Via unterminated multi-core data communication cables Max. cable cross section 2.
Connecting RJ 45 Data Communication Cables to the Fronius String Control 250/25 2 1 * * 2 2 1 IN OUT 1 * Silicon tube NOTE! Procedure when only 1 data communication cable is being connected to the Fronius String Control 250/25 (e.g., when the Fronius String Control 250/25 is the last component in a Solar Net): - Insert the termination plug in the free RJ 45 connection. The termination plug is included with the Fronius Datalogger.
Connecting Unterminated Multi-core Data Communication Cables to the Fronius String Control 250/25 (continued) NOTE! Procedure when only 1 unterminated multi-core data communication cable is being connected to the Fronius String Control 250/25 (e.g., when the Fronius String Control 250/25 is the last component in a Solar Net): - If the data communication cable is connected to the „IN“ terminals, connect the termination plug to the „OUT“ RJ 45 connection.
Connecting an External Power Supply General The Fronius String Control 250/25 is supplied power through Solar Net. The power supply from Solar Net, however, may no longer be sufficient when combined with additional DATCOM components or when data communication cables exceed a length of 100 m. In this case, an external power supply is available.
Setting the Address Safety General WARNING! An electrical shock can be fatal. Danger from DC voltage from solar modules. - Make sure that the input and output sides in front of the device are not charged before connecting anything. - Any and all connections should only be carried out by qualified electricians. - Follow the safety rules in these operating instructions. Solar Net allows up to 200 Fronius String Control 250/25’s to operate simultaneously.
Installing the Protection Against Contact and Closing the Fronius String Control 250/25 Safety Installing Protection Against Contact WARNING! An electrical shock can be fatal. Danger from DC voltage from solar modules. - Make sure that the input and output sides in front of the device are not charged before connecting anything. - Any and all connections should only be carried out by qualified electricians. - Follow the safety rules in these operating instructions.
Settings General Settings for the Fronius String Control 250/25 are made in the “Fronius Solar.access“ software. Initial Steps - Install Fronius Solar.access software on a PC Administration / Create PV System PV Systems / [System Name] / Settings / String Control (1) (2) (3) Possible Settings for the Fronius String Control 250/25 (1) Select the number (address) of the Fronius String Control 250/25 to be set (2) Strings per Measuring Channel (3) Limit Values: - Max.
Strings per Measuring Channel Enter the number of solar module strings for each measuring channel. This results in automatic compensation of measuring channel deviations, which would only be required if there were a different number of strings per channel. Max. Energy Deviation The 5 measuring channels record the total current of the respective connected solar module strings over the entire charging day.
Display of Data and Status Messages Data Display Current data from the Fronius String Control 250/25 are displayed in: PV Systems / [System Name] / Real-time / String Control Status Messages Status messages generated by the Fronius String Control 250/25 are sent to the datalogger. The datalogger processes this as it would a status message generated by the inverter. Status messages can be sent as an SMS, fax or e-mail. For further details please refer to the DATCOM operating instructions.
Replacing String Fuses Safety WARNING! Operating the equipment incorrectly can cause serious injury and damage. The following activities must only be carried out by trained and qualified personnel. Follow the safety rules in these operating instructions. WARNING! An electrical shock can be fatal. Danger from DC voltage from solar modules. - Make sure that the input and output sides in front of the device are not charged before conducting maintenance work. - Never remove a fuse while it is under load.
Replacing String Fuses (continued) 1 2 1 2 1 3 3 Find out and correct the cause of the defective fuse Finally...
Technical Data Input data DC input voltage range 0 - 600 V Max. input voltage (at 1000 W/m² / 14°F in open circuit operation) 600 V Max. array short circuit current per string (1.25 * Imax) 12.5 A Max. number of strings (with solar module fuse) Admissible cable cross section (for DC cable ‘IN’) min. AWG 12 - max. AWG 8 Cu and Al solid and stranded conductors Number of measuring channels 5 Max. current per measuring chanenel 50 A Max. input current per fuse holder 20 A Max.
General Data Protection type NEMA 3R Protection class Type 1 (grounded) Ambient conditions -13°F - +140°F -25°C - +60°C Dimensions w x h x d (without mounting clips) 27.56 x 19.53 x 5.00 in. 700 x 496 x 127 mm Dimensions w x h x d (with mounting clips) 30.63 x 19.53 x 5.00 in. 778 x 496 x 127 mm Weight 26.46 lbs.
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Fronius Worldwide - www.fronius.com/addresses A Fronius International GmbH 4600 Wels-Thalheim, Günter-Fronius-Straße 1, Austria E-Mail: pv@fronius.com http://www.fronius.com USA Fronius USA LLC Solar Electronics Division 10421 Citation Drive, Suite 1100, Brighton, MI 48116 E-Mail: pv-us@fronius.com http://www.fronius-usa.com Under http://www.fronius.
