Vertical Mobility
Key Factors in Elevator Governor Testing & EN81 Compliance
Engr. Sarah Ahmed•August 31, 2026•6 min read
An in-depth technical analysis on overspeed governor testing and preventive maintenance procedures to prevent elevator freefall.
1. Mechanical Governor Calibration & Principles
The governor is a centrifugal mechanical device connected via steel wire rope directly to the elevator safety gear on the car frame. If car velocity exceeds 115% of rated speed, the centrifugal weights overcome calibrated spring tension and trigger mechanical jaws that clamp onto the governor rope.
2. Periodic Inspection & Testing Checklist
Verification of rope grip force under dynamic test loads is essential for European Union EN81-20 and EN81-50 compliance. Ensuring proper lubrication and tensioning prevents false trips and guarantees safe passenger transit under all load conditions.