BEAM PROTECTION SYSTEM FOR A DOOR OPERATOR

摘要

A obstruction beam protection system for sensing an object in the path of the door during closing of the door by a door operator and for inhibiting operation for closing of the door. The beam protection system comprises a beam transmitter and beam receiver for positioning proximate to a passageway to be closed by the door, so as, when in use, to project a beam from the beam transmitter across the passageway to be receivable by the beam receiver. The beam transmitter and the beam receiver are provided with a local communication system for communication with an operator communication system associated with the operator. The beam transmitter and the beam receiver are both adapted to operate in a low power sleep state and a wake state. In the wake state the beam transmitter will transmit a beam across the passageway to be receivable by said beam receiver and so said beam receiver will be able to process a received beam as an indication of an object not being in the path of the door, the absence or interruption of a received beam as an indication of an object being in the path of the door. This later condition of absence or interruption can be communicated via the local communication system to the operator communication system to inhibit said operator from closing said door by appropriate operation of the operator electric control circuitry.