Instruction Manual

3-10 Component Description

3.8.11 Light Curtain

The Light Curtain is an optional substitute for transparent front doors. To detect obstructions, the Light

Curtain uses an emitter and a receiver. The emitter has a vertical array of infrared lights that shine upon

the matching array of light sensors on the receiver. The emitter and receiver are mounted vertically on

each side of the dispensing area entrance (see

Figure 3-7). When an object 19 mm (0.75 in) in diameter

or larger interrupts the invisible light beam between an emitter/receiver pair, the blockage triggers the

Safety Interlock System. The Interlock System then disables the dispensing machinery, but leaves the

Computer on.

If the dispensing system is not running a dispensing program, an intruding object will cause a recoverable

interlock condition. In this case, the yellow light in the

DISPENSER STATUS section of the Control

Panel turns ON and the yellow light on the Light Beacon turns ON. To recover, simply remove the object.

The system will resume normal status.

If the dispensing system is actively running a dispensing program, an intruding object will cause a Non-

Recoverable Interlock Shutdown. The red

ABORT LED on the Control Panel flashes, and the red light on

the Light Beacon and the red System Status LED turn ON. Refer to 2.10.3.1 Non-Recoverable Interlock

Shutdown for recovery instructions.

Item Description

1 Emitter

2 Close-up of Light Curtain Indicators (emitter and receiver)

3 Receiver

4 Green LED

5 Red LED

6 Yellow LED

Figure 3-7 Light Curtain (option)