EWS UFS8000, Operating Manual, Page: 33 / 130

UFS8000 Components 26
6.5. Tanks
6.5.1. Clean water tank
There are two available types of level measuring, namely measurements with level switches (1 or 2) or
level measurements with a 0(4)-20mA output that can be connected to a 0-20mA control input (if
available).
Take note:
The following description assumes that the unrefined water tank is not empty. If the unrefined water
tank is empty, then the control will not go to the “Filtration” phase, but will switch to the “Standby”
phase (possibly through a backwash, if activated).
Level switches
If the level switches are being used, the “Interface Input” will have to be specified.
Two level switches may be placed in a clean water tank. A high-level switch (HL) and a low-level
switch (LL). For the inventory the level switch that is connected can be indicated.
If both level switches are not connected the unit may only be switched manually in the “Filtration”
phase.
If both switches are connected the unit will be switched in the “Filtration” phase as soon as the low-
level switch is active. The
unit will quit the “Filtration” phase again as soon the high-level switch is
active.
If both switches are active (owing to a faulty connection, cable cut or defect in one of the switches) the
high-level switch has the highest priority and the unit will switch off.
If only a high-level switch is programmed, the clean water tank programming can be used to set a
delay before the unit is switched on in the “Filtration” phase. If the high-level switch is active the unit
will move directly out of the “Filtration” phase. In all other cases no delay has to be set while the clean
water tank does not appear in the list of components with programmable settings.
Level measurements 0(4)-20mA output
If level measuring with power output is active, the “0-20mA
Interface” will be selected.
It will subsequently be possible to select a 0-20mA input. And
after that, it will be possible to select the range of the
measurement cell (0-20mA or 4-20mA).
If no hardware connection is made, it will only be possible to
switch the installation on and off manually.