en Operation
74 WILO SE 2018-12
▪Pumps are enabled (menu 3.01 to 3.04).
▪The “Extern OFF” input is not active.
7.1.4 Operation with a defective level
sensor
If the level sensor does not transfer a measured value (e.g. due to wire break, defective
sensor), all pumps are switched off. Furthermore, the fault signal LED lights up and the
collective fault signal is activated.
Emergency operation
▪Operating mode “drain”: High water level
If the high water level is performed by a separate float switch, the system can continue
running in emergency operation. The activation and deactivation points are defined by
the hysteresis of the float switch.
▪Operating mode “fill”: Min. water level
If the min. water level is monitored by a separate float switch, the system can continue
running in emergency operation. The activation and deactivation points are defined by
the hysteresis of the float switch.
7.2 Operating modes
NOTICE
Changing the operating mode
To change the operating mode, deactivate all pumps: in Menu 3.01, select the value
„OFF“.
NOTICE
Operating mode after power failure
Following a power failure, the switchgear will automatically start up in the last oper-
ating mode set.
The following operating modes are possible:
▪drain
▪fill
7.2.1 “Drain” operating mode
The reservoir or pump chamber is drained. The pumps are activated when the level rises
and switched off when the level falls. This control is mainly used for water drainage.
Level measurement with float switch
Fig.24: Illustration of the switching points with
a float switch in the “drain” operating mode
using the example of two pumps
1 Pump 1 On
2 Pump 2 On
3 Pump 1 and 2 Off
4 Dry-running level
5 High water level
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
▪Dry-running level
▪High water level
The float switch should be equipped with a NO contact: Once the switching point has
been reached, the contact is closed.
To Next Page
Loading...
Need help?
General
