SMC Networks ITV Series Manual page 15

ITV1000/2000/3000
Series
Working Principle
When the input signal rises, the air supply solenoid valve q turns ON, and the exhaust
solenoid valve w turns OFF. Therefore, supply pressure passes through the air supply
solenoid valve q and is applied to the pilot chamber e. The pressure in the pilot
chamber e increases and operates on the upper surface of the diaphragm r.
As a result, the air supply valve t linked to the diaphragm r opens, and a portion of
the supply pressure becomes output pressure.
This output pressure feeds back to the control circuit i via the pressure sensor u.
Here, a correct operation functions until the output pressure is proportional to the input
signal, making it possible to always obtain output pressure proportional to the input
signal.
Working Principle Diagram
Power supply
Input signal
q Air supply
solenoid
valve
r Diaphragm
SUP
Block diagram
Input signal
14-8-16
Downloaded from Elcodis.com electronic components distributor
Pressure display
i Control Output signal
circuit
w Exhaust
solenoid
valve
u Pressure sensor
e Pilot chamber
t Supply valve
OUT
EXH
ITV1000
q Air supply solenoid valve
i Control circuit
w Exhaust solenoid valve
u Pressure sensor
Power supply
Input signal
q Air supply
solenoid
valve
r Diaphragm
EXH
y Exhaust
valve
t Supply
valve
SUP
ITV2000, 3000
Supply pressure
r Diaphragm
Pressure display
Output signal
i Control
circuit
w Exhaust
solenoid
valve
EXH
u Pressure
sensor
e Pilot
chamber
EXH
OUT
Output pressure
Pilot valve