Barrier e.g. fire-proof door, movement controlling device, has commutator selecting electrical load based on input from sensors to control braking of motor when barrier is shifted from raised to lowered position

摘要

The device has a motor (20) mechanically coupled to a barrier (10) by a barrier coupling device (21). A dummy electrical load (22) is operationally coupled to the motor by a commutator (23). The commutator selects an electrical load according to an input from sensors (25-27) to control braking of the motor when the barrier is shifted from a raised position to a lowered position. Independent claims are also included for the following: (a) a device for controlling movement of fire-proof door (b) a process for controlling movement of a fire-proof door.