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SENSOR S PRESSURE SENSOR Chapter Issue 2 Oct 06 Technical Reference Manual 31.15 T esting/ Adjustment For adjus tment refer to the Pneumatic Modul e Chapter . The sensor may be tested eit her in circuit or di sconnected:…

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SENSORS
PRESSURE SENSOR
31.14 Technical Reference Manual Chapter Issue 2 Oct 06
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 31-16 Pressure Sensor Schematic
Digital Input
V+ (User)
Opto-isolator
1K8
0V (User)
12V
0V
Pressure Sensor Symbol
Pressure Sensor and Gauge
P
Common
NC
NO
SENSORS
PRESSURE SENSOR
Chapter Issue 2 Oct 06 Technical Reference Manual 31.15
Testing/
Adjustment
For adjustment refer to the Pneumatic Module Chapter.
The sensor may be tested either in circuit or disconnected:
In circuit -
• Monitor the voltage at signal DIG 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 31-17 Pressure Diagram
Indicated
Pressure
12V
0V
Open
Circuit
Closed
Circuit
Open
Circuit
Set Point
Contact
Continuity
Digital I/P
Signal
5
3
bar
0
SENSORS
GIANT MAGNETO RESISTIVE SENSOR (GMR)
31.16 Technical Reference Manual Chapter Issue 2 Oct 06
GIANT MAGNETO RESISTIVE SENSOR (GMR)
Description The sensor reacts to the magnetic field produced by the magnetic end of the
cylinder piston. This produces an analogue signal proportional to the piston
position, ie the closer the piston to the sensor the larger the analogue signal.
This analogue signal is fed to the Analogue to Digital Converter (ADC) on the
print carriage I/O Node 3 PCB and the digital output is fed via the CAN bus to
the NextMove ES card.
Figure 31-18 Giant Magneto Resistive Schematic
Testing/
Adjustment
The sensor does not require adjustment. In use the assembly is calibrated -
see the ProFlow Module Chapter for details.