88192277-01-19 - Micron Technical Reference V9 Volume 4.pdf - 第128页

SENSORS OPTO SENSORS 40.6 Technical Reference Manual Chapter Issue 6, May 19 2. Short out the signal to earth on the socket. 3. Check the relevant digital input under Diagnostics - System - Display all Digital Inputs to …

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SENSORS
OPTO SENSORS
Chapter Issue 6, May 19 Technical Reference Manual 40.5
Testing Procedure If the sensor fails to operate carry out the following:
1. Disconnect the opto.
2. Short out the signal to earth on the socket.
3. Check the relevant digital input under Diagnostics - System - Display all
Digital Inputs to confirm, or otherwise, that the sensor is defective.
Figure 40-5 Voltage Diagram
Through Beam
Optos
The types of through beam opto used on this printer are:
• Fork Sensor Type
• Long Throw 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 high or low depending on connection (L).
Figure 40-6 Through Beam Optos
Testing Procedure If the sensor fails to operate carry out the following:
1. Disconnect the opto.
Board
Absent
Present
Absent
12V
0V
Signal
Through Beam Fork Opto
+V
Opto-isolator
1K8
0V
0V
+V
Signal O/P
Vane
Control
Circuit
Digital Input
(L)
Pin 1 - +V
Pin 2 - (L)
Pin 3 - Signal O/P
Pin 4 - 0V
Operation Indicator
Transmitted Beam
1
12V
0V
SENSORS
OPTO SENSORS
40.6 Technical Reference Manual Chapter Issue 6, May 19
2. Short out the signal to earth on the socket.
3. Check the relevant digital input under Diagnostics - System - Display all
Digital Inputs to confirm, or otherwise, that the sensor is defective.
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 40-7 Long Throw Opto
Testing/Adjustment If the sensor fails to operate, confirm the sensor is faulty as follows:
1. Disconnect the long throw opto receiver.
2. Short out the signal to earth on the socket.
3. Check the relevant digital input under Diagnostics - System - Display all
Digital Inputs to confirm, or otherwise, that the sensor is defective.
Figure 40-8 Voltage Diagram
Long Throw Optos
+V
Opto-isolator
1K8
0V
0V
12V
Signal O/P
12V
0V
Control
Circuit
12V
12V
Emitter
Emitter
0V
0V
Signal O/P
Receiver
Receiver
12V
0V
Digital Input
Vane
Out
In
Out
12V
0V
On
Off
Off
Indication Light
Signal
SENSORS
ULTRASONIC SENSOR
Chapter Issue 6, May 19 Technical Reference Manual 40.7
ULTRASONIC SENSOR
Description The ultrasonic sensor transmits a conical shaped area of ultrasonic sound
waves; some of the waves are rebounded back to the receiver in the sensor.
When a board passes over the sensor the amount of rebounded sound
changes, switching the output of the sensor.
Figure 40-9 Ultrasonic Sensor
Testing Procedure If the sensor fails to operate carry out the following:
1. Disconnect the sensor.
2. Short out the signal to 0V on the socket.
3. Check the relevant digital input under Diagnostics - System - Display all
Digital Inputs to confirm, or otherwise, that the sensor is defective.
Figure 40-10 Voltage Diagram
+V
Opto-isolator
1K8
0V
Pin 1 12V
Pin 2 Teach
Pin 3 0V
Pin 4 Signal
+V
0V
View on Arrow A
Bi-Colour Status LED
Teach Button
Ultrasonic Sensor
A
Digital Input
Control
Circuit
Board
Absent
Present
Absent
12V
0V
Signal