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SENSORS AND MOTORS PRESS URE SEN SOR 20.18 Technical Reference Manual Chapter Issue 1 Sep 02 PRESSURE SENSOR Descriptio n The pressure sensor switch is wired as a normally open (NO) switch whi ch is closed by the air pre…

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SENSORS AND MOTORS
MICROSWITCH SENSOR
Chapter Issue 1 Sep 02 Technical Reference Manual 20.17
MICROSWITCH SENSOR
Description The microswitch sensor used in this application is a solid state microswitch with
no mechanical contacts. The plunger operates a Hall effect sensor triggering
the transistorized output.
Figure 20-15 Microswitch Sensor and Schematic
Testing/
Adjustment
Testing can be carried out with the microswitch in circuit by measuring the
voltage between pin O and pin
- (0V), Voltage Diagram Figure below, refers.
Figure 20-16 Voltage Diagram
Stepper Multiplexer Digital Input
V+ (User)
Opto-isolator
2K
0V
Squeegee/ProFlow Home Microswitch
o
+
-
s
Voltage
Regulator
Trigger
Circuit
and
Amplifier
Hall Effect
Sensor
Block Diagram of Microswitch
+
o
_
Switch Position
Released Depressed Released
12V
0V
Voltage
Output at O
SENSORS AND MOTORS
PRESSURE SENSOR
20.18 Technical Reference Manual Chapter Issue 1 Sep 02
PRESSURE SENSOR
Description The pressure sensor switch is wired as a normally open (NO) switch which is
closed by the air pressure exceeding the set point.
Figure 20-17 Pressure Sensor Schematic
SENSORS AND MOTORS
PRESSURE SENSOR
Chapter Issue 1 Sep 02 Technical Reference Manual 20.19
Testing/
Adjustment
For adjustment refer to the Pneumatics Module Chapter.
The sensor may be tested either in circuit or disconnected:
In circuit -
• Monitor the voltage at signal IN 0 whilst increasing the pressure from zero
using the main regulator. As the air pressure exceeds the set point value
the voltage is pulled down to 0V.
Disconnected -
• Measure continuity across the switch whilst increasing the pressure from
zero using the main regulator. As the air pressure exceeds the set point
value the contacts close.
Figure 20-18 Pressure Diagram
Indicated
Pressure
12V
0V
Open
Circuit
Closed
Circuit
Open
Circuit
Set Point
Contact
Continuity
Digital I/P
Signal
5
3
bar
0