Fail Safe System - AMK International Corp. Ltd

Fail Safe Smoke Ventilation System

Starting position or position in case of power failure:
  • The entire actuator is unpowered.
  • The deputy gear is in relaxed position because of the return spring.
  • The drive worm is connected to the deputy gear via the lever and the deputy gear disengages the wormwheel from the drive gear.
  • The transmission can rotate freely.
  • A tensile force on the chain, which is generated by the gas pressure springs or gravitational pull force on the window, pulls the chain from the actuator.
  • The window is open.

Triggering process through power failure or alarm:
  • On power failure the holding power of the servo motor is lost.
  • The deputy gears are now turned into starting position because of the return spring.
  • The drive motor unit is dragged away from the drive gear via the lever of the deputy gears and simultaneously pushed away by the recoil force, caused by the gas pressure spring and gravitational pull force of the window, at the wormwheel.
  • The wormwheel is now disengaged and can turn freely. The window opens indepentently by the gas pressure springs and pulls the chain from the actuator.



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