Siemens LOGO! 24 - Page 173

165
LOGO! Manual
A5E00067781 01
Components used
 K1 Master contactor
 K2 Master contactor
 S0 (NC contact) Stop switch
 S1 (NO contact) Start switch
 S2 (NO contact) Flow sensor
 S3 (NO contact) Flow sensor
 H1 Indicator lamp
 H2 Indicator lamp
Block diagram of the LOGO! solution
The block diagram of the ventilation control system with
LOGO! is as follows:
x
I1On
Q3Fault
I2Off
Q1
Exhaust
fan
Q2
Fresh-air
fan
Q1
Extractor fan
I3
Exhaust air
flow sensor
x
I2Off
Fault
x
T=
10 s
x
T= 10 s
x
x
x
I3
Exhaust air flow
sensor
I4
Fresh-air flow
sensor
Extractor fan Q1
Extractor fan Q2
Q3
Applications