122 WT.050.570.000.DE.IM.0714
Functions DEPOLOX
®
Pool
2.6
Completing
adaption with error
If errors occur in the control loop during adaption (e.g. filter backwas-
hing, changes in the circulation or widely fluctuating number of visitors
to the pool) or if the reaction times of the control loop are too long, ad-
aption is interrupted.
Possible error conditions:
Initial value not reached (Display: "T = > 8h")
When adaption has started and the dosing system has closed or the
dosing pump has switched off, the measuring amplifier waits until the
actual value has dropped below the initial value (0.2 x the measure-
ment range value). This delay is indicated by the message "2: X = 20
%" and may take up to 8 hours.
Loop dead time too high (Display: "Tu = > 1h")
The maximum permissible value determined by timing between ope-
ning of the dosing system or activation of the dosing pump and the in-
crease in the actual value is 1 hour. This measured time is displayed by
"6: Tu!".
Loop rise time too high (Display: "Ts = > 8h")
The time is measured which the control loop requires at a 100 % dosing
rate of the dosing system or the dosing pump to increase the actual va-
lue to 50 % of the measuring range. This measurement is indicated by
the message "9: Ts!" and the maximum permissible time is 4 hours.
If any of the error conditions described above occur, adaption is inter-
rupted. The measuring amplifier indicates an error message. The "old"
parameters Xp and Tn are not changed.
Determination of the
control parameters with
known Tu and Ts times
If the loop times Tu and Ts are already known or if these cannot be de-
termined automatically due to specific system conditions, the loop ti-
mes can be entered into the "Tu" and "Ts" menus. When Tu or Ts are
saved, the control parameters Xp and Tn are also calculated and ente-
red into the menus.
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