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Applications
IDEC SmartRelay Manual
272
Components used
• K1
contactor relay
• K2
contactor relay
• S0
(normally closed contact)
STOP pushbutton
• S1
(normally open contact)
START pushbutton
• S2
(normally open contact)
flow sensor
• S3
(normally open contact)
flow sensor
• H1
signal lamp
• H2
signal lamp
Block diagram of the IDEC SmartRelay solution
The block diagram of the air-conditioning system with IDEC
SmartRelay :
x
I1
Q3
I2
Q1
Q2
Q1
I3
x
I2
x
T=
10 s
x
T= 10 s
x
x
x
I3
I4
Q1
Q2
Q3
Exhaust
fan
On
Error
Off
Exhaust fan
Exhaust air
flow sensor
Fresh-air
flow sensor
Fresh-air fan
Exhaust fan
Exhaust air
flow sensor
Fresh-air
fan
Error
Off
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com