Brake Beams; Safety Relay - Acer Wood Runner Manual

6.5 BRAKE BEAMS

These are single light beam sensors protecting both sides of the Gantry. Breaking either beam will cause an
E-stop condition. The primary purpose is to rapidly stop the Gantry if something is in the path of travel.
The sensors consist of two parts, the Emitter and Receiver. The sensor located closest to the Infeed Deck is
the Home Brake Beam and the other sensor is the Away Brake Beam. Each sensor has a corresponding
Input on the Input/Output Module in the Gantry enclosure. These Inputs are equipped with a status LED.
The LED is illuminated if the beam sensor is not blocked. Blocking the sensor or a beam out of alignment
will cause the relay LED to go off and cause an E-stop condition.
Home and Away Brake Beam Receivers

6.6 SAFETY RELAY

A Safety Relay located in the Main Electrical Enclosure which monitors the status of the Light Curtain, E-
stop button and Obstruction Sensors. When any of these are triggered by the operator or an unsafe
condition the relay shuts the Wood Runner system down and reports this to the PC. The PC can then
display information on the screen relating to the source of the E-stop condition. The Safety Relay is
equipped with 3 LED's to help troubleshoot any problems. See section 6 for Safety Relay information.
Safety Relay
Home and Away Brake Beam Emitters
Safety Relay
LED lights
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