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Elevator Seismic Switches — Frequently Asked Questions
How does a seismic switch protect elevator passengers during an earthquake?
When the seismic sensor detects vibration above its trigger threshold (typically 0.03–0.15 g), it immediately sends a stop signal to the elevator controller. The controller executes an emergency levelling move to the nearest floor at reduced speed, opens the landing and car doors, and disables the lift from accepting further service calls. This sequence is completed within 5–30 seconds depending on car position and speed, ensuring passengers are not trapped between floors. After the earthquake, a qualified technician must inspect the guide rails, ropes, and mechanical components before resetting the system for normal service.
What is the difference between mechanical and MEMS seismic switches?
Traditional mechanical seismic switches use a pendulum or ball-in-ring mechanism that physically displaces when vibration exceeds a threshold, breaking a contact. They are simple, reliable, and low-cost but have fixed sensitivity and must be manually reset after every trigger. MEMS (micro-electro-mechanical) switches use solid-state silicon sensors to measure acceleration digitally. They offer adjustable sensitivity thresholds, directional discrimination (horizontal vs. vertical), event logging, remote reset capability, and self-diagnostic functions. MEMS devices are recommended for modern installations and high-rise buildings.
Where should seismic switches be installed in an elevator system?
A minimum of one seismic switch should be mounted in the machine room or control panel room, at the floor level of the building that best represents ground motion (typically the lowest floor or basement). In high-rise buildings, additional sensors may be installed at intermediate floors to detect amplified building response. The sensor must be mounted on a rigid surface and away from vibration sources such as motors or compressors. The mounting orientation must match the sensor's designed detection axis (horizontal and/or vertical).
Are seismic switches mandatory for elevators in Türkiye?
While Turkish elevator legislation (Lift Directive transposition) does not yet universally mandate seismic switches for all lifts, the Turkish Earthquake Regulation (AFAD) and updated building codes increasingly recommend or require them for new buildings in seismic zones. Following recent earthquakes in western and central Anatolia, many building owners and insurance companies now make seismic switches a condition of coverage. Elevator.tr suppliers offer equipment certified to both European (EN 81-77) and Turkish earthquake safety guidelines.