G. Safety Standards & Testing
Limit Switch
limit switch, stage position switch, hoist limit
What is a Limit Switch?
A limit switch is a position-sensing device that stops a motorized stage device at a predetermined point of travel. Every motorized hoist, lift, and curtain track uses limit switches to prevent over-travel and ensure safe operation within defined boundaries.
Key Components
Mechanical limit switchPhysical contact, adjustable position
Rotary encoderPrecise position feedback (digital)
Proximity sensorNon-contact detection (metal target)
Magnetic switchReed switch with magnet actuator
Key Concepts
Upper limitPrevents over-hoisting
Lower limitPrevents over-lowering
Final limitBackup safety limit (separate from working limit)
Deceleration limitTriggers slow-down before final position
Related Standards
- All limit switches must be wired to the safety circuit, not just the control program (per EN 17206).