{"schemaVersion":1,"slug":"variable-speed-drive-run-enable-interface","name":"Variable-speed drive run-enable interface","kind":"symbol","abbreviation":"VDRI","aliases":["Motor-feeder control interfaces","switchgear Motor-feeder control interfaces","switchgear","Switchgear","Run permission","Drive enable signal"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Carries a permitted run command to the drive control interface.","description":["Carries a permitted run command to the drive control interface. A motor feeder combines switching, motor protection and an operating command. Starting permission, running feedback and protection trip are different signals even where one relay or controller processes all of them.","In a switchroom motor-control panel, a ventilation motor can receive an automatic start request while a local selector and the motor protection determine whether the feeder is available. For this reference, the drawing identifies “Run permission” at the input and “Drive enable signal” at the output. Run enable differs from a safety-rated torque-off function.","Link the motor tag to its contactor, protective device and process permissives. The control diagram must identify stop priority, feedback and restart philosophy without supplying unverified settings. 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: Run permission. Identify its source device or document and the state represented on the drawing.","Follow the named output: Drive enable signal. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Run enable differs from a safety-rated torque-off function.","Link the motor tag to its contactor, protective device and process permissives. The control diagram must identify stop priority, feedback and restart philosophy without supplying unverified settings."],"drawingChecklist":["Label the source and connection reference for run permission.","Identify the destination and defined state of drive enable signal.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Run enable differs from a safety-rated torque-off function."],"distinction":"Run enable differs from a safety-rated torque-off function. 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":"Switchgear"},{"label":"Input / boundary","value":"Run permission"},{"label":"Output / connection","value":"Drive enable signal"},{"label":"Lookup label","value":"VDRI is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-motor-relay","relevance":"Public technical context for motor-feeder control interfaces. Motor feeder thermal, starting and control functions. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["contactor","motor-overload-trip-nc-contact","motor-restart-inhibit-block"],"artwork":"pi26-variable-speed-drive-run-enable-interface","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"motor-feeders","input":"Run permission","output":"Drive enable signal"},"plainEnglish":{"title":"What this block does","introduction":"Carries a permitted run command to the drive control interface.","example":"In a switchroom motor-control panel, a ventilation motor can receive an automatic start request while a local selector and the motor protection determine whether the feeder is available. For this reference, the drawing identifies “Run permission” at the input and “Drive enable signal” at the output. Run enable differs from a safety-rated torque-off function.","drawings":"Start at the named input: Run permission. Identify its source device or document and the state represented on the drawing. Follow the named output: Drive enable signal. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Run permission"},{"name":"Output","meaning":"Drive enable signal"},{"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":["Run permission","VDRI","Drive enable signal"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"SEL-710 motor protection and control","url":"https://selinc.com/products/710/"}],"profileId":"power-installation-motor-feeders"},"url":"https://eloragrid.ai/symbols/variable-speed-drive-run-enable-interface","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/variable-speed-drive-run-enable-interface.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-motor-relay","publisher":"SEL","title":"SEL-710 motor protection and control","url":"https://selinc.com/products/710/","scope":"Motor feeder thermal, starting and control functions.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for motor-feeder control interfaces. Motor feeder thermal, starting and control functions. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}