User Manual

Applications
IDEC SmartRelay Manual 295
8.7.3 Service water pump system with FL1E-
H12RCC
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
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 (n
ormally open contact) pressure switch
•S2 (n
ormally open contact) float switch
•S3 (n
ormally closed contact) float switch
•S4 (n
ormally closed contact) float switch