Additional Controller Functions; Underload Detection; Function - Graf oneAdvanced Operation Manual

9

Additional controller functions

9.1 Underload detection

Underload detection is deactivated by default. When the plant is started up, it runs in automatic
mode regardless of the volume of wastewater flowing in.
Note
We recommend activating this function after a run-in phase of 3 months at the earliest!
KLcontrol.S and KLcontrol.M control units are fitted with a pressure sensor as standard and this
can be used to establish the level in the first chamber. This function is used to save energy
when the flow of wastewater is low.
IMPORTANT
Incorrect settings will cause malfunction
Incorrect calibration of the plant could cause it to operate constantly in
economy mode (with cycle pause). Correct cleaning of wastewater is not then
possible.
Calibration and level-dependent operation must be activated by a
maintenance fitter or expert only.
9.1.1

Function

9.1.1.1 Functions of oneAdvanced 3–9 PE
The water level is measured at adjustable intervals at the
start of a cleaning cycle by means of the pressure in the
membrane aerator. If the level in the tank exceeds a pre-
viously set level ("Level measurement" in service level),
the system starts a cleaning cycle. If the set level is not
reached, the system automatically goes into cycle pause
for the set interval. Only enough oxygen to maintain the
biological components is then pumped into the system.
The water level continues to be measured during the cy-
cle pause at set intervals. Should sufficient wastewater
have again flowed into the system after a certain time,
the control unit switches to the normal cleaning cycle
once the set level is reached.
9. Additional controller functions
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Water level when
underload detection
activated vated
Inlet
C
Figure 13: Clear water lifter, levels in
SBR reactor
a
Minimum water
level
b