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SENSORS AND MOTORS OPTO SENSORS Chapter Issue 1 Sep 02 Technical Reference Manual 20.11 Long Throw T ype The lon g throw opto wor ks on th e same princip al as the through bea m type but uses two indiv idual sensor devi …
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
SENSORS AND MOTORS
OPTO SENSORS
20.12 Technical Reference Manual Chapter Issue 1 Sep 02
Testing/Adjustment If the sensor fails to operate, confirm the sensor is faulty as follows:
1. Disconnect the through beam opto.
2. Short out the signal to earth on the socket.
3. Check that the relevant MultiMove LED is illuminated, if so the sensor is
defective.
Figure 20-10 Voltage Diagram
Vane
Out
In
Out
12V
0V
On
Off
Off
Indication Light
(Rail Lift Up optos only)
Signal