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.
Connection diagram
Block diagram
The block diagram shows you how to interconnect the pump controls and the solenoid valve. Its layout corresponds with the structure of the circuit diagram.
Options
For specific applications, you also have the choice of integrating additional functions which could otherwise only be realized with additional switchgear:
Enabling the pump at specific times, for example, only during the summer months or at a specific time-of-day
Indication of imminent or existing shortage of water
System error messages