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Δh1
Δh2
Dry-running
level
High level
Overflow pit
Float switch
Dlx
PX
Al1
Al1
Dlx
Dlx
DOx (Start Px)
DOx (Start Px)
t
t
t
TM047174
Example of two-pit control
Configuration
Logical
operator
AND function
1st source
•
AI1 (CU 362), Level, pressure.
•
Water level higher than 2.5 m ("1").
•
Input signal, Inverted.
This means that the input signal is lower than
2.5 m ("1").
2nd source
•
DIx (float switch in overflow pit).
An "AND" operator has been selected. This means that both input
signals must be "1" before the output signal changes status to "1".
After an overflow situation has occurred, and the overflow pit has
been filled, the water must be pumped back into the wastewater pit.
The pump in the overflow pit must not be started until the overflow
situation is under control again. The water level in the wastewater
pit must be lower than 2.5 m before the 1st source changes status
to "1". The 2nd source already has status "1" triggered by the float
switch in the overflow pit. Note that the 1st source has been
inverted.
The pump in the overflow pit is started, and the water is pumped
back into the wastewater pit. The pump in the overflow pit is either
stopped by the float switch in the overflow pit or by a too high water
level in the wastewater pit.
Example 2
The user-defined functions can also be configured by using the
Grundfos PC Tool WW Controls.
To configure a user-defined function, proceed as follows:
1. Select "Edit and view settings".
2. Select "User-defined function".
3. Select the user-defined function to be configured.
4. Configure the two sources and give the user-defined function a
name.
The user-defined function must be activated before the
function can be used.
See the figure below.
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