Nexen AWL 280 912662 - Manual (Page 4)

4 FORM NO. L-20219-B-1212
INTRODUCTION
Nexen’s Web Guide Sensor System is used for web control applications. The Web Guide Sensor System consists of two
AWL280 Sensors, an AS10-D Amplifier and a Web Guide Controller.
The AWL280 Sensors are placed at opposite edges of the web and work in tandem to track the position of the web. The
AWL280 Sensors send an infrared light from the projector housing across a gap to the detector housing. A web passing
through the gap blocks the light. The electrical output signal from the sensor to the AS10-D Amplifier will change in
response to the changes in the infrared light.
The ASD10-D Amplifier is the excitation signal for the sensors. The ASD10-D Amplifier conditions the sensor output
for transmission to the Web Guide Controller. The sensors transmit data to the Web Guide Controller which in turn,
generates a control output signal. This control output signal moves a mechanical element (e.g., roll stand, guide roll
steering mechanism) which keeps the center of the web at the center line of the machine. This type of closed-loop web
guiding is called "Center Guiding" or "Center Position Control" (CPC).
DETECTOR DARK
LEFT RIGHT
PROJECTOR ON
POWER
ON