Revision 1
ELECTRO-PNEUMATICS
COURSE CONTENT
• Overview and application of electro-
pneumatics
• Component symbols and descriptions
• Electrical components and circuit
development
• Solenoid valves
Topic 1
Overview and
application of electro-
pneumatics
Overview
• Electro-pneumatic control - an integration of
pneumatic and electrical technologies
•
it provides a cost effective and efficient production
system to meet the demand that machine cycle times
are minimized
• advantages:
– greater signal transmission distance
– shorter transmission time
Component Placement - Pneumatic
SIGNAL
FLOW
R
P
S
Y1
Y2
A
B
Energy supply
Final control
element
Actuator
Component Placement - Electrical
S
I
G
N
A
L
F
L
O
W
+ 24 v
0V
S1
S2
K1
K2
Y1
Y2
K1
K2
Energy supply
Input elements
Processing and
final control
element
Electro-pneumatic Elements
Energy Supply
compressor, receiver, pressure regulator,
air service unit, AC/DC power supply
Sensor
limit switches, pushbuttons, proximity
sensors
Processors
solenoid directional control valves, logic
elements, pneumatic/electric converter, relay
Control Elements
solenoid actuated directional control valves,
relay
Actuators
cylinders, rotary actuators, lamps, buzzers
Electrical Diagram
e1
e2
e3
e4
e5
24V
0V
K1
(Y)
Topic 2
Components Symbols
and Descriptions
What Symbols Tell You
• Pneumatic and electric components:
– function
– labeling of connections
– actuation methods
• electric components:
– voltage level and current type (AC/DC)
– current path
• pneumatic components:
– number of switching positions
– simplified representation of the flow path
What Symbols Don’t Tell You
• Component dimensions or energy handling
capacity
• method of construction or manufacturer
• orientation or valve/cylinder ports or electrical
connections
• physical details of elements
• hardware relating to electric/pneumatic unions or
junctions
Switches and Relay Contacts
Normally open
contact
Changeover
contact
Normally closed
contact
Two-way, normally
open switch with
three positions
Switches and Rel