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Elevator Overload Devices – Frequently Asked Questions
Where is the overload device typically installed in an elevator?
The most common installation location is beneath the car sill or within the car frame structure, where the device measures the deflection or load on the floor-support elements. Alternative locations include the rope hitch plate (measuring rope tension directly), the car buffer spring, or the compensation chain attachment point. The installation location is selected based on the drive type and car structure design during the engineering phase.
What happens when an overload is detected?
When the overload threshold is exceeded (typically 100–110% of rated load), the overload device signals the elevator controller, which activates an audible alarm inside the cabin, keeps the cabin doors open, and prevents the elevator from moving. The system resets automatically once sufficient load is removed. Some modern systems also log overload events with timestamps for maintenance records and compliance documentation.
What accuracy and calibration is required for overload devices?
EN 81-20 requires overload detection to be reliable across the rated temperature range of the installation. Load cell-based systems typically offer ±1–3% accuracy. Devices must be calibrated after installation using certified test weights, with calibration records retained as part of the technical file. Recalibration is recommended after any modification to the car structure or during major maintenance under TS EN 13015.
Can overload devices be retrofitted to older elevators?
Yes. Overload device retrofitting is one of the most common modernization upgrades for older elevator installations that lack this feature or use outdated electromechanical systems. Turkish suppliers on Elevator.tr offer universal retrofit kits with adjustable mounting brackets, programmable setpoints, and output relay configurations compatible with virtually all existing elevator control systems.