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3.5 Practical example
LOGO!Soft Comfort Online Help
Operating Instructions, 11/2017
195
3.5.3
Layout of the solution
The pump and a solenoid valve are controlled by a pressure switch and three float switches,
which are installed in the service water reservoir. The pump must be switched on if the
pressure in the reservoir drops below minimum. When the operating pressure is reached, the
pump is switched off again after a tracking time of a few seconds. The tracking time prevents
pump oscillation if water is tapped over an extended period.
3.5.4
Solution with LOGO!
Connecting field devices
In addition to the LOGO! device, all you need is the pressure switch and the float switches to
control the pump. If you are using a 3-phase AC motor, a contactor relay is required for
switching the pump. In systems with single-phase AC pumps, you must install a contactor
relay if the current of the AC pump exceeds the switching capacity of the output relay Q1. A
solenoid valve can usually be controlled directly, due to its low power consumption.
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