(week 9) project, electro-pneumatics and design1
DESCRIPTION
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Slide 1
ELECTRO-PNEUMATICS
If voltage (V) is pressure (P), current (I) is mass flow rate (Q), what is resistance (R) in V = IR?
Resistance is viscosity ()!
A materials opposition to the flow of electric current; measured in ohms ()
To simplify
What is resistivity?
Which one actually kills you?
The danger of high voltage: high voltage means potential for large amounts of current through your body, which will injure or kill you.
Resistance opposes current. High resistance, good protection from shock.
Any V above 30 V can deliver potentially dangerous I.
Voltage or Current?
Introduction
Electro-pneumatic Combination of electrical and pneumatic system
Used when the process is repeating and setup cost is low
But
Maintenance troubleshooting is very complex
Structure circuit structure is messy when involving complex design
Components
Relay
On/Off switch
Components
Solenoid
Single valve solenoid Double valve solenoid
Symbols of Solenoid Valve
Pneumatic Circuit Symbol
Electrical Circuit Symbol
Y1
Development of Electro-pneumatic circuit
Circuit Design Structure
1.Identify sequence of movement
2.Divide sequence into groups
3.Identify limit switch status
4.Identify number of conductor line
( = number of group)
5.Identify number of reversing switch
(= number of group)
Circuit Design Structure - Example
Sequence : A+B+B-A-
Groups: K1 K2
Limit switch status:A1B1B0A0
Conductor Line: L1 L2
Reversing Switch: S1 S2
Basic Circuit
2 conductor lines
2 reversing switches
Start + A0 A+
A1 B+
B1 B-
B0 A-
Electro-Pneumatic Circuit
Electro-Pneumatic Circuit
Electro-Pneumatic Circuit
Electro-Pneumatic Circuit
Electro-Pneumatic Circuit
Electro-Pneumatic Circuit
Electro-Pneumatic Circuit
Electro-Pneumatic Circuit
Electro-Pneumatic Circuit
Electro-Pneumatic Circuit
Electro-Pneumatic Circuit
A
B
P
T
Y1
Y2
A
B
P
T
Y1
Y1
Y1
Y2