{"product_id":"kostal-piko-dc-trennstelle-dc-disconnect-board-3-string","title":"KOSTAL PIKO DC-Trennstelle | DC Disconnect Board | 3-String","description":"\u003ch2 class=\"PDq2pG_selectionAnchorContainer\"\u003e\n\u003cspan role=\"text\"\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/span\u003e\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eUsed product.\u003c\/strong\u003e Original \u003cstrong\u003eKOSTAL PIKO DC-TRENNSTELLE\u003c\/strong\u003e electronic board, used in the DC input system of first-generation KOSTAL PIKO photovoltaic inverters. The \u003cstrong\u003eDC-Trennstelle\u003c\/strong\u003e is the electronic section dedicated to the \u003cstrong\u003econnection, disconnection, and management of photovoltaic strings in direct current\u003c\/strong\u003e, with power supply, control, and power relay drive circuits.\u003cbr\u003eThe photographed board features a \u003cstrong\u003e3-String configuration\u003c\/strong\u003e. It includes \u003cstrong\u003ethree power relays\u003c\/strong\u003e, power supply circuitry, switching components, transformers\/inductors, driver circuits, and interface connectors. KOSTAL used the \u003cstrong\u003eelectronic DC-Trennstelle\u003c\/strong\u003e in PIKO inverters to manage photovoltaic generator disconnection on the DC side.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan role=\"text\"\u003e⚙️ \u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e KOSTAL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e \u003cstrong\u003eDC-TRENNSTELLE \/ Electronic DC Disconnect\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible configuration:\u003c\/strong\u003e \u003cstrong\u003e3-String\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower relays:\u003c\/strong\u003e \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible connectors:\u003c\/strong\u003e X2, X3, X4, X5, X6, X7\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower supply circuit:\u003c\/strong\u003e integrated on the PCB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl circuits:\u003c\/strong\u003e integrated for relay and DC sequence management\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e industrial PCB with discrete components, relays, switching circuits, transformers\/inductors, and connections for the inverter DC system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan role=\"text\"\u003e⚡ \u003cstrong\u003eFunction in the Photovoltaic System\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eDC-Trennstelle\u003c\/strong\u003e is located in the inverter input section and electronically manages the \u003cstrong\u003econnection and disconnection of the PV strings\u003c\/strong\u003e to the power electronics.\u003cbr\u003eDuring PIKO startup, the board participates in the power supply and control sequence required to allow correct transfer of DC voltage to the subsequent inverter sections. Correct operation of the relays and the board's auxiliary power supply is therefore essential for completing the startup procedure.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan role=\"text\"\u003e🔧 \u003cstrong\u003eFaults, Errors \u0026amp; Symptoms\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eA fault in the \u003cstrong\u003eDC-Trennstelle\u003c\/strong\u003e can cause situations where the inverter receives voltage from the panels but \u003cstrong\u003efails to complete startup\u003c\/strong\u003e.\u003cbr\u003eSymptoms may include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003einverter remaining \u003cstrong\u003e“Aus \/ Off”\u003c\/strong\u003e despite the presence of DC voltage;\u003c\/li\u003e\n\u003cli\u003efailure to detect or transfer DC voltage to the subsequent stage;\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC relays failing to switch\u003c\/strong\u003e;\u003c\/li\u003e\n\u003cli\u003erelays producing \u003cstrong\u003erepeated clicks\u003c\/strong\u003e during the startup attempt;\u003c\/li\u003e\n\u003cli\u003edisplay values unavailable or shown as \u003cstrong\u003e“XXX”\u003c\/strong\u003e during the startup procedure;\u003c\/li\u003e\n\u003cli\u003einverter failing to correctly detect \u003cstrong\u003eDC and\/or AC\u003c\/strong\u003e during the initial phase;\u003c\/li\u003e\n\u003cli\u003estatus LEDs showing an abnormal sequence or absence of normal initialization;\u003c\/li\u003e\n\u003cli\u003efailure to restart after shutdown;\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eintermittent operation\u003c\/strong\u003e, with the fault potentially varying depending on temperature or after a power supply reset;\u003c\/li\u003e\n\u003cli\u003einverter apparently switched off despite significant PV voltage being present at the input.\u003cbr\u003eIn particular, the \u003cstrong\u003e“XXX” error\/symptom during startup\u003c\/strong\u003e, when the inverter fails to correctly detect DC\/AC parameters, may be associated with a DC-Trennstelle problem, but \u003cstrong\u003eit is not an exclusive diagnostic code for this board\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan role=\"text\"\u003e🛠️ \u003cstrong\u003ePossible Repair Work\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eThe board can undergo \u003cstrong\u003ecomponent-level electronic repair\u003c\/strong\u003e. Among the faults reported on DC-Trennstelle boards of this generation are problems in the power supply section, including \u003cstrong\u003eloss of capacitance of capacitor C4\u003c\/strong\u003e and faults\/desoldering of \u003cstrong\u003ediode D10\u003c\/strong\u003e.\u003cbr\u003eDuring a professional inspection, the following may be checked:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eelectrolytic capacitors\u003c\/strong\u003e, particularly in the power supply section;\u003c\/li\u003e\n\u003cli\u003ediodes and switching circuit;\u003c\/li\u003e\n\u003cli\u003edriver transistors;\u003c\/li\u003e\n\u003cli\u003eauxiliary power supplies of the board;\u003c\/li\u003e\n\u003cli\u003evoltages used to control the relays;\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ecoils and contacts of the three DC relays\u003c\/strong\u003e;\u003c\/li\u003e\n\u003cli\u003etransformers and magnetic components;\u003c\/li\u003e\n\u003cli\u003esolder joints, tracks, and connections;\u003c\/li\u003e\n\u003cli\u003econnectors and wiring;\u003c\/li\u003e\n\u003cli\u003econtrol and feedback circuits.\u003cbr\u003eRepair of the DC-Trennstelle can therefore resolve \u003cstrong\u003estartup failure, relays not switching, intermittent startup, and conditions in which the PIKO remains switched off or displays “XXX” despite photovoltaic voltage being present\u003c\/strong\u003e.\u003cbr\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e not all PIKO startup problems are necessarily caused by the DC-Trennstelle. Similar symptoms can also be caused by the \u003cstrong\u003epower board, DC-DC converter, wiring, power supplies, or other sections of the inverter\u003c\/strong\u003e. Diagnosis must therefore be carried out on the complete inverter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan role=\"text\"\u003e🌐 \u003cstrong\u003eCompatibility \u0026amp; Applications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eThe DC-Trennstelle of this generation is associated with \u003cstrong\u003efirst-generation KOSTAL PIKO DCS\u003c\/strong\u003e inverters. The replacement-parts market lists it for various versions of the PIKO family, including \u003cstrong\u003ePIKO 3.0, 3.6, 4.2, 5.5, 7.0, 8.3, and 10.1\u003c\/strong\u003e.\u003cbr\u003eCompatibility must nevertheless be verified by comparing the \u003cstrong\u003ePANEL, BOARD, PCB revision, and inverter configuration\u003c\/strong\u003e, as different versions of the DC-Trennstelle may exist.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan role=\"text\"\u003e🏭 \u003cstrong\u003eConstruction \u0026amp; Product Condition\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eThe photographed board is \u003cstrong\u003eused\u003c\/strong\u003e and shows normal signs of use, handling, and previous installation. \u003cstrong\u003eThree power relays\u003c\/strong\u003e, electronic components, transformers\/inductors, power supply circuits, and original connectors are visible.\u003cbr\u003eNo major structural damage to the PCB is evident from the photographs. \u003cstrong\u003eOperation is not declared as tested\u003c\/strong\u003e, unless specifically indicated in the sale.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan role=\"text\"\u003e🛡️ \u003cstrong\u003eSafety\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eDC-Trennstelle operates on the photovoltaic DC circuit\u003c\/strong\u003e, where high and dangerous voltages may be present even with the AC grid disconnected.\u003cbr\u003eInstallation, replacement, and especially repair must be carried out exclusively by \u003cstrong\u003equalified personnel\u003c\/strong\u003e, following the safety procedures required for PV inverters. After repairing the board, \u003cstrong\u003einsulation, tightening, connections, compatibility, and inverter operation under high voltage\u003c\/strong\u003e must be correctly verified.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan role=\"text\"\u003e📦 \u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e1 × KOSTAL PIKO DC-TRENNSTELLE electronic board\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan role=\"text\"\u003e🚀 \u003cstrong\u003eFinal Description\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eKOSTAL PIKO DC-Trennstelle\u003c\/strong\u003e is an original electronic board designed for the \u003cstrong\u003emanagement and disconnection of DC strings\u003c\/strong\u003e in first-generation KOSTAL PIKO photovoltaic inverters. The presence of \u003cstrong\u003ethree power relays\u003c\/strong\u003e and the associated power supply and control circuitry makes it a fundamental component in the startup sequence and photovoltaic input management.\u003cbr\u003eIt is a particularly interesting replacement part for PIKO inverters presenting \u003cstrong\u003estartup failure, an apparently switched-off inverter with DC voltage present, relays failing to switch, intermittent startup, or “XXX” displayed during the initialization phase\u003c\/strong\u003e. Electronic servicing may particularly involve the power supply section, including \u003cstrong\u003eC4, D10, switching circuit, relay drive, and related components\u003c\/strong\u003e.\u003c\/p\u003e","brand":"Kostal Piko","offers":[{"title":"Default Title","offer_id":54707812401485,"sku":null,"price":450.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0802\/3274\/3245\/files\/MG_6776.jpg?v=1789057989","url":"https:\/\/greenenergy-repair.com\/el\/products\/kostal-piko-dc-trennstelle-dc-disconnect-board-3-string","provider":"Green Energy","version":"1.0","type":"link"}