88192277-01-19 - Micron Technical Reference V9 Volume 4.pdf - 第138页
SENSORS PRESSURE SENSOR 40.16 Technical Reference Manual Chapter Issue 6, May 19 T esting/ Adjustment For adjustment refer to the Pneumatic Mod ule Chapter . The sensor may be tested either in circuit or disconnected: In…
SENSORS
PRESSURE SENSOR
Chapter Issue 6, May 19 Technical Reference Manual 40.15
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 40-18 Pressure Sensor Schematic
Digital Input
+V
Opto-isolator
1K8
0V
12V
0V
Pressure Sensor Symbol
Pressure Sensor and Gauge
P
Common
NC
NO
SENSORS
PRESSURE SENSOR
40.16 Technical Reference Manual Chapter Issue 6, May 19
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 40-19 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)
Chapter Issue 6, May 19 Technical Reference Manual 40.17
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 40-20 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.
+12V
Print Carriage
I/O Node 3
0V
Sig
0V
+12V
M36 Machine Control
M37 Power Supply Crate
NextMove
ES Card
Paste
Level
Amplifier
GMR
Sensor
Paste Level Amplifier
Pneumatic Actuator and GMR Sensor
Pneumatic
Actuator
GMR Sensor
15
0
30
Output 0.5V - 5V
Digital
Out
Analog
In
ADC
CAN Bus
Power
Distribution
PCB