Printer 710_810 v8 Sensors.pdf - 第7页
SENSOR S CAPACITIVE PROXIMITY SENSOR Chapter Issue 2 Oct 06 Technical Reference Manual 31.7 CAP ACITIVE PROXIMITY SENSOR Descriptio n A capa citive p roximity se nsor consist s of an RC oscil lator which emit s a frequen…
SENSORS
OPTO SENSORS
31.6 Technical Reference Manual Chapter Issue 2 Oct 06
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 the relevant digital input under Diagnostics - System - Display all
Digital Inputs to confirm, or otherwise, that the sensor is defective.
Figure 31-7 Voltage Diagram
Vane
Out
In
Out
12V
0V
On
Off
Off
Indication Light
Signal
SENSORS
CAPACITIVE PROXIMITY SENSOR
Chapter Issue 2 Oct 06 Technical Reference Manual 31.7
CAPACITIVE PROXIMITY SENSOR
Description A capacitive proximity sensor consists of an RC oscillator which emits a
frequency field. When the target, in this case the solder paste, moves away
from the sensing range (ie paste low), the capacitance increase effectively
changes the internal current which is detected by an adjustable trigger. The
control circuit switches the output transistor on.
Figure 31-8 Capacitive Proximity Sensor
Capacitive Proximity Switch
Sensor Bracket
LED
Paste Level Sensor
LED Adjuster
and Indicator
Sensor Bracket
Sensor
PastePaste Cartridge
Paste Level
Sensor
V+ (User)
Opto-isolator
1K8
0V (User)
0V
12V
RC Frequency Field
Solder Paste
12V
0V
Pin 1
Control
Circuit
Pin 2
Pin 3
Digital Input
SENSORS
CAPACITIVE PROXIMITY SENSOR
31.8 Technical Reference Manual Chapter Issue 2 Oct 06
Testing/
Adjustment
Figure 31-9 Voltage Diagram
Setting Up
Procedure
The procedure for setting up the capacitive proximity sensor is fully detailed in
the Paste Dispenser System chapter of this manual, (Adjustments and Settings
section).
Node Absent Present Absent
12V
0V
Off OffOn
Operation Indicator
Signal