{"schemaVersion":1,"slug":"rotary-ups","name":"Rotary UPS","kind":"symbol","abbreviation":"RUPS","aliases":["diesel rotary UPS","DRUPS","rotary uninterruptible power supply"],"category":"microgrid-systems","drawingTypes":["SLD"],"referenceFamilies":["IEC","IEEE / ANSI"],"summary":"A UPS built around a rotating synchronous machine with kinetic storage, often coupled to a diesel engine for long backup.","description":["A rotary UPS uses a synchronous machine running continuously on the critical bus, with stored kinetic energy in a flywheel or induction coupling bridging the gap until a coupled diesel engine starts and takes over. A choke between the utility and the critical bus lets the machine condition the supply and isolate the load from network faults.","Single-line diagrams show the incoming utility feeder, a series choke, the synchronous machine with its kinetic energy module and clutch to the engine, and the critical and sometimes non-critical outputs. A bypass path around the unit is normally drawn.","The machine provides real short-circuit current, unlike a static UPS, which helps downstream protection discriminate. The symbol does not show the ride-through time to engine pickup or the choke impedance, both of which matter for design."],"readingNotes":["Identify the choke between the utility and critical bus.","Check engine coupling and the kinetic module."],"drawingChecklist":["State machine rating and ride-through time.","Show choke, engine coupling and bypass.","Reference fault current contribution."],"distinction":"A rotary UPS uses rotating machines and kinetic storage; a static UPS uses power electronics and a battery.","facts":[{"label":"Energy store","value":"Kinetic, flywheel or induction coupling"},{"label":"Long backup","value":"Coupled diesel engine"},{"label":"Fault current","value":"Machine-sourced"},{"label":"Preview","value":"Independent educational illustration; consult the applicable standard and project legend for the exact graphic"}],"references":[{"sourceId":"pub-symbol-ups-functions","relevance":"Public UPS function context."},{"sourceId":"pub-object-cummins-application","relevance":"Public engine-generator application context."}],"related":["flywheel-energy-storage","motor-generator-set","online-double-conversion-ups","diesel-generator-set"],"artwork":"s28-rotary-ups","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","plainEnglish":{"title":"What does Rotary UPS mean?","introduction":"A rotary UPS uses a synchronous machine running continuously on the critical bus, with stored kinetic energy in a flywheel or induction coupling bridging the gap until a coupled diesel engine starts and takes over. A choke between the utility and the critical bus lets the machine condition the supply and isolate the load from network faults.","example":"Single-line diagrams show the incoming utility feeder, a series choke, the synchronous machine with its kinetic energy module and clutch to the engine, and the critical and sometimes non-critical outputs. A bypass path around the unit is normally drawn.","drawings":"The machine provides real short-circuit current, unlike a static UPS, which helps downstream protection discriminate. The symbol does not show the ride-through time to engine pickup or the choke impedance, both of which matter for design.","terms":[{"name":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."},{"name":"Schematic","meaning":"A drawing showing function and connections rather than physical appearance."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"DC UPS, AC UPS and capacitor buffer modules","url":"https://www.phoenixcontact.com/en-gb/products/uninterruptible-power-supplies-ups"},{"label":"T-030 liquid-cooled generator set application manual","url":"https://www.cummins.com/sites/default/files/2024-08/t030-Liquid-cooled-gen-set-application-manual.pdf"}],"detail":"A UPS built around a rotating synchronous machine with kinetic storage, often coupled to a diesel engine for long backup. A rotary UPS uses rotating machines and kinetic storage; a static UPS uses power electronics and a battery.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/rotary-ups","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/rotary-ups.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-symbol-ups-functions","title":"DC UPS, AC UPS and capacitor buffer modules","publisher":"Phoenix Contact","url":"https://www.phoenixcontact.com/en-gb/products/uninterruptible-power-supplies-ups","type":"manufacturer","scope":"Public manufacturer explanation of the equipment function and selection context.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public UPS function context."},{"id":"pub-object-cummins-application","title":"T-030 liquid-cooled generator set application manual","publisher":"Cummins","url":"https://www.cummins.com/sites/default/files/2024-08/t030-Liquid-cooled-gen-set-application-manual.pdf","type":"manufacturer","scope":"Public manufacturer application manual, Issue 9, February 2015; context for generator integration. Current selected-generator documentation and applicable regulations control implementation.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public engine-generator application context."}]}