The counterweight governor tripping speed should be calibrated to what percentage above the car governor trip speed?

The counterweight governor tripping speed should be calibrated to 10% above the car governor trip speed. This is important because the counterweight governor serves as a safety device that ensures the elevator system operates within safe parameters. By setting the tripping speed of the counterweight governor at 10% above the car governor trip speed, it provides a buffer that can prevent dangerous overspeed conditions.

This calibration allows for the timely detection of any issues that could lead to an unsafe condition. If the car governor trips due to excessive speed, the counterweight governor acts as an additional layer of safety by triggering before the system can reach a critical threshold. It ensures that the counterweight does not gain excessive velocity, protecting both the equipment and passengers.

In summary, calibrating the counterweight governor's tripping speed to 10% above the car governor's trip speed strikes a balance between responsiveness and safety, contributing to the overall reliability of the elevator system.