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Applications
289
IDEC SmartRelay Manual
8.7.3
Service water pump system with FL1D-
H12RCC
L1
N
I4
I5
I6
I7
I8
Q1
Q2
Q3
Q4
K1
Y1
S4
S3
L1
N
S1
S2
p<
I1
I2
I3
1 2
1 2
1 2
1 2
Drinking water supply line
Pump
Apart from the IDEC SmartRelay, all you need is a pressure
switch and the float switches to control the pump. If you are
using a 3-phase AC motor, you must use a contactor relay to
switch the pump. For single-phase AC pump systems you
must provide a contactor relay if the power consumption of
the AC motor exceeds the capacity of the output relay Q1.
The power consumption of a solenoid valve is usually low
enough to allow direct controlling.
• K1
contactor relay
• Y1
solenoid valve
• S1
(normally open contact)
pressure switch
• S2
(normally open contact)
float switch
• S3
(normally closed contact)
float switch
• S4
(normally closed contact)
float switch
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com