{"schemaVersion":1,"slug":"microgrid-failed-reconnect-restraint","name":"Microgrid failed-reconnect restraint","kind":"symbol","abbreviation":"MFR","aliases":["Microgrid synchronising interfaces","microgrids Microgrid synchronising interfaces","microgrids","Microgrids","Reconnect failure state","Reconnect attempt restraint"],"category":"microgrid-systems","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Blocks repeated reconnect attempts according to the documented failure and reset policy.","description":["Blocks repeated reconnect attempts according to the documented failure and reset policy. Synchronising control compares two AC systems before their assigned connecting breaker closes. Voltage magnitude, frequency, phase relationship, breaker readiness and command authority are separate inputs to the closing decision.","In a microgrid reconnecting at its point of common coupling, a synchroniser can adjust the island reference while a separate permissive confirms the permitted relationship across the open breaker. For this reference, the drawing identifies “Reconnect failure state” at the input and “Reconnect attempt restraint” at the output. The reset rule must be separately defined.","Identify the two measurement sides and the equipment receiving any adjustment request. Closing limits, breaker timing and loss-of-measurement behavior require the approved synchronising design. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation."],"readingNotes":["Start at the named input: Reconnect failure state. Identify its source device or document and the state represented on the drawing.","Follow the named output: Reconnect attempt restraint. Cross-reference its destination and separate the command from confirmation that the equipment responded.","The reset rule must be separately defined.","Identify the two measurement sides and the equipment receiving any adjustment request. Closing limits, breaker timing and loss-of-measurement behavior require the approved synchronising design."],"drawingChecklist":["Label the source and connection reference for reconnect failure state.","Identify the destination and defined state of reconnect attempt restraint.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: The reset rule must be separately defined."],"distinction":"The reset rule must be separately defined. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.","facts":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Microgrids"},{"label":"Input / boundary","value":"Reconnect failure state"},{"label":"Output / connection","value":"Reconnect attempt restraint"},{"label":"Lookup label","value":"MFR is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-mg-design","relevance":"Public technical context for microgrid synchronising interfaces. Microgrid power and control interfaces, synchronisation and source coordination. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["25-synchronism-check","synchronoscope","microgrid-synchronising-cancellation-interface"],"artwork":"pi26-microgrid-failed-reconnect-restraint","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"microgrids","family":"microgrid-sync","input":"Reconnect failure state","output":"Reconnect attempt restraint"},"plainEnglish":{"title":"What this block does","introduction":"Blocks repeated reconnect attempts according to the documented failure and reset policy.","example":"In a microgrid reconnecting at its point of common coupling, a synchroniser can adjust the island reference while a separate permissive confirms the permitted relationship across the open breaker. For this reference, the drawing identifies “Reconnect failure state” at the input and “Reconnect attempt restraint” at the output. The reset rule must be separately defined.","drawings":"Start at the named input: Reconnect failure state. Identify its source device or document and the state represented on the drawing. Follow the named output: Reconnect attempt restraint. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Reconnect failure state"},{"name":"Output","meaning":"Reconnect attempt restraint"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["Reconnect failure state","MFR","Reconnect attempt restraint"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Microgrid Flex components and control design","url":"https://productinfo.se.com/microgrid_guide/0100db2503_ecostruxure-microgrid-flex_design-guide_iec/English/0100DB2503-Microgrid%20Flex%20Design%20Guide-IEC-Optimize%20%28bookmap%29_DD00654397.XML.xml/%24/MicrogridFlexComponents-3A7DD96C"}],"profileId":"power-installation-microgrid-sync"},"url":"https://eloragrid.ai/symbols/microgrid-failed-reconnect-restraint","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/microgrid-failed-reconnect-restraint.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-mg-design","publisher":"Schneider Electric","title":"Microgrid Flex components and control design","url":"https://productinfo.se.com/microgrid_guide/0100db2503_ecostruxure-microgrid-flex_design-guide_iec/English/0100DB2503-Microgrid%20Flex%20Design%20Guide-IEC-Optimize%20%28bookmap%29_DD00654397.XML.xml/%24/MicrogridFlexComponents-3A7DD96C","scope":"Microgrid power and control interfaces, synchronisation and source coordination.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for microgrid synchronising interfaces. Microgrid power and control interfaces, synchronisation and source coordination. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}