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SENSORS AND MOTORS OPTO SENSORS 20.10 Technical Reference Manual Chapter Issue 1 Sep 02 Refractive T ype Opto The Refract ive T ype Opto sensor i s used in appl ication s when checking l iquid levels. The opto works by t…
SENSORS AND MOTORS
OPTO SENSORS
Chapter Issue 1 Sep 02 Technical Reference Manual 20.9
2. Short out the opto.
3. Check that the relevant MultiMove LED is illuminated or that the NextMove
pin breakout is 0V to confirm, or otherwise, that the sensor is defective.
Figure 20-7 Voltage Diagram
Board
Absent
Present
Absent
12V
0V
On OnOff
Red LED
Signal
SENSORS AND MOTORS
OPTO SENSORS
20.10 Technical Reference Manual Chapter Issue 1 Sep 02
Refractive Type
Opto
The Refractive Type Opto sensor is used in applications when checking liquid
levels. The opto works by the refraction of light from an internal LED through
the liquid being sensed, ie solvent cleaning fluid.
Fitted to the underscreen cleaner solvent tank the opto is used to detect when
the liquid solvent falls below the set level.
Figure 20-8 Refractive Type Opto (Liquid Level)
Through Beam
Optos
The types of through beam opto used on this machine are:
• Fork Sensor Type
• Long Throw Type
• Counter Type
Fork Sensor Type The through beam fork sensor transmits a beam across the gap in the opto.
When a vane enters the gap the beam is broken and the sensors output
transistor is switched on.
Solvent Low Sensor
Liquid Level
Red - +12 V
Green - Sig
Black - 0 V
MultiMove Digital Input
V+ (User)
Opto-isolator
2K
0V (User)
0V
12V
Signal
12V
0V
Control
Circuit
SENSORS AND MOTORS
OPTO SENSORS
Chapter Issue 1 Sep 02 Technical Reference Manual 20.11
Long Throw Type The long throw opto works on the same principal as the through beam type but
uses two individual sensor devices (receiver and emitter) to cover a wider gap,
ie screen at centre indicator.
Figure 20-9 Through Beam Optos