{"schemaVersion":1,"slug":"station-battery-low-voltage-alarm-block","name":"Station battery low-voltage alarm block","kind":"symbol","abbreviation":"SBLAB","aliases":["Station battery and charger distribution","substations Station battery and charger distribution","substations","Substations","Battery-bus voltage","Low-voltage alarm state"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Applies the documented battery-bus low-voltage supervision to its assigned alarm output.","description":["Applies the documented battery-bus low-voltage supervision to its assigned alarm output. A station battery system supplies protection, control and other assigned DC loads through a documented charger and distribution arrangement. Charger output, battery contribution and load distribution are related but separately monitored paths.","In a substation control building, the battery can support breaker trip circuits while the charger AC supply is unavailable. Supervision must identify whether the charger, battery or a downstream feeder is affected. For this reference, the drawing identifies “Battery-bus voltage” at the input and “Low-voltage alarm state” at the output. Voltage is not a direct measure of usable capacity.","Identify every source, protective device, isolation boundary and return. Battery capacity, DC fault duty, charging settings and ventilation require the selected battery-system design; illustrative circuits do not establish autonomy. 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: Battery-bus voltage. Identify its source device or document and the state represented on the drawing.","Follow the named output: Low-voltage alarm state. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Voltage is not a direct measure of usable capacity.","Identify every source, protective device, isolation boundary and return. Battery capacity, DC fault duty, charging settings and ventilation require the selected battery-system design; illustrative circuits do not establish autonomy."],"drawingChecklist":["Label the source and connection reference for battery-bus voltage.","Identify the destination and defined state of low-voltage alarm state.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Voltage is not a direct measure of usable capacity."],"distinction":"Voltage is not a direct measure of usable capacity. 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":"Substations"},{"label":"Input / boundary","value":"Battery-bus voltage"},{"label":"Output / connection","value":"Low-voltage alarm state"},{"label":"Lookup label","value":"SBLAB is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-station-dc","relevance":"Public technical context for station battery and charger distribution. Battery charging modes, DC distribution interfaces and charger alarms. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["ga-station-dc-battery-rack","ga-battery-charger","station-battery-high-voltage-alarm-block"],"artwork":"pi26-station-battery-low-voltage-alarm-block","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"substations","family":"station-battery","input":"Battery-bus voltage","output":"Low-voltage alarm state"},"plainEnglish":{"title":"What this block does","introduction":"Applies the documented battery-bus low-voltage supervision to its assigned alarm output.","example":"In a substation control building, the battery can support breaker trip circuits while the charger AC supply is unavailable. Supervision must identify whether the charger, battery or a downstream feeder is affected. For this reference, the drawing identifies “Battery-bus voltage” at the input and “Low-voltage alarm state” at the output. Voltage is not a direct measure of usable capacity.","drawings":"Start at the named input: Battery-bus voltage. Identify its source device or document and the state represented on the drawing. Follow the named output: Low-voltage alarm state. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Battery-bus voltage"},{"name":"Output","meaning":"Low-voltage alarm state"},{"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":["Battery-bus voltage","SBLAB","Low-voltage alarm state"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"MicroGenius S2/S4 battery charger technical manual","url":"https://www.sens-usa.com/hubfs/Controlled%20Files/Manuals/101330_MGS_User_Manual.pdf"}],"profileId":"power-installation-station-battery"},"url":"https://eloragrid.ai/symbols/station-battery-low-voltage-alarm-block","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/station-battery-low-voltage-alarm-block.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-station-dc","publisher":"SENS","title":"MicroGenius S2/S4 battery charger technical manual","url":"https://www.sens-usa.com/hubfs/Controlled%20Files/Manuals/101330_MGS_User_Manual.pdf","scope":"Battery charging modes, DC distribution interfaces and charger alarms.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for station battery and charger distribution. Battery charging modes, DC distribution interfaces and charger alarms. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}