wunder betaAD How Automatic Doors Work
Follow sensors, controllers, operators, sliding and swing paths, safety logic, accessibility, and maintenance through an automatic doorway.
What you’ll learn
- The opening requestExplain how an activation device begins an automatic door cycle.A sensor, button, mat, or access control sends a request that the controller interprets.
- The operatorIdentify the motor, drive, controller, and linkage that move a powered door.The operator converts controlled electrical commands into mechanical movement.
- Sliding pathsTrace how carriers, tracks, belts, and leaves create a sliding opening.An overhead drive moves door leaves along a constrained track beside the passage.
- Swing pathsContrast a swinging automatic door with a sliding door.A swing operator rotates a leaf through an arc and must manage that moving zone.
- Activation and presenceDistinguish approach detection from safety-zone presence detection.Different sensor jobs tell the controller when to open and when to hold or reverse.
- The safety loopExplain how sensors and controller logic manage closing and obstructions.A clear path permits closing while a detected person or obstruction changes the response.
- Revolving doorsDescribe how a rotating set of leaves creates compartments at an entrance.Revolving geometry admits people while limiting the direct open air path.
- Revolving geometryRead a plan view of a revolving door.A central spindle and radial leaves divide a circular entrance into rotating pockets.
- Access and egressConnect automatic-door operation to accessibility and emergency route requirements.A usable entrance depends on clear width, controls, timing, and power-off behavior.
- Modes and maintenanceExplain why operating modes and inspection affect door safety.Function switches and maintenance determine whether the system behaves as intended.
Questions this course answers
What does an activation sensor usually do first?
The activation device detects an approach or receives an input, then sends a signal that the controller interprets.
Put the main sliding-door sequence in order.
The request becomes a controller command, mechanical drive moves the leaves, and safety logic governs the return to closed.
Match each door-system part to its main job.
Automatic doors divide sensing, decision-making, force, and guidance among different components.
Why must an automatic entrance be evaluated when power is off?
Accessible routes and emergency egress can depend on how the door behaves during a power loss, including whether it stays open or permits manual passage.
Why are activation and presence sensors not the same thing?
The two sensors support different decisions: one starts access and the other helps prevent contact or entrapment during movement.
Grounded in trusted sources
- U.S. Access Board, Chapter 4: Entrances, Doors, and Gates: https://www.access-board.gov/ada/guides/chapter-4-entrances-doors-and-gates/
- ANSI, ANSI/BHMA A156.10-2024 Standard for Power Operated Pedestrian Doors: https://webstore.ansi.org/standards/bhma/ansibhmaa156102024
- STANLEY Access Technologies, Swinging Door Openers Activation & Safety Sensors: https://www.stanleyaccess.com/swinging-door-openers-activation-safety-sensors
- Japan Automatic Door Association, Safety Guide and Automatic Door Mechanism: https://www.jada-info.jp/about_safety/01guide.html
- Wikimedia Commons MediaWiki API image records: https://commons.wikimedia.org/w/api.php
Every Wunder lesson is built from real, reputable sources — never invented.
Related Science courses
Wunder is a personalized learn-anything platform — tell it any topic and it builds a beautiful, fact-checked course in minutes, with narration, a knowledge check, and a college-style University track.
Browse more Science courses · All topics · Home
© 2026 Wunder Learning LLC · Terms & Privacy