Wilo Wilo-Control EC-L - Page 75

Operation en
Installation and operating instructions Wilo-Control EC-L 75
Level measurement with level sensor or dynamic pressure bell
5
2
1
3
4
6
7*
8*
Fig.25: Illustration of the switching points with
a level sensor in the “drain” operating mode
using the example of two pumps
1 Pump 1 On
2 Pump 1 Off
3 Pump 2 On
4 Pump 2 Off
5 Dry-running level
6 High water level
7 High water level*
8 Dry-running level*
*Also realised via a separate float switch for increased operational reliability.
A level sensor or dynamic pressure bell can be connected. This can be used to control
three pumps:
▪Pump 1 On/Off
▪Pump 2 On/Off
▪Pump 3 On/Off
▪Dry-running level
▪High water level
7.2.2 “Fill” operating mode
The reservoir is filled up, for instance, to pump water into a rainwater storage tank. The
pumps are activated when the level falls and switched off when the level rises. This
control is mainly used for water supply.
Level measurement with float switch
Extern OFF
4
5
3
1
2
Fig.26: Illustration of the switching points with
a float switch in the “fill” operating mode using
the example of one pump
1 Pump On
2 Pump Off
3 High water level
4 Min. water level
5 Dry-running level in the well
Up to a maximum of five float switches can be connected. This can be used to control
two pumps:
▪Pump 1 On
▪Pump 2 On
▪Pump 1 and 2 Off
▪Min. water level in the tank to be filled
▪High water level
▪Dry-running level in the well (separate float switch at the “Extern OFF” input)
The float switch should be equipped with a NO contact: Once the switching point has
been reached, the contact is closed.