Applications
252
IDEC SmartRelay Manual
8.7.3 Service water pump system with FL1C-
H12RCC
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.
• K1contactor relay
• Y1solenoid valve
•S1 (make contact) pressure switch
•S2 (make contact) float switch
•S3 (break contact) float switch
•S4 (break contact) float switch
L1 N I4 I5 I6 I7 I8
Q1 Q2 Q3 Q4
K1 Y1
S4S3
L1
N
S1
S2
p<
I1 I2 I3
1 2 1 2 1 2 1 2
Drinking water supply linePump
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com
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