Evoqua WALLACE & TIERNAN MFC, Инструкция по эксплуатации

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104
WT.050.580.000.DE.IM.0714
Functions
MFC
4.
4.9 Adaption
This only applies to Cl
2
single feed back control module 1 and 2.
Use Adaption is used for automatic determination of the reaction times
of the control loop (loop dead time Tu and loop rise time Ts) or the
resulting control parameters Xp and Tn.
Please note
The control parameters Xp and Tn determined by adaption must
be regarded as a recommendation for commissioning! The control
parameters Xp and Tn can be manually optimised for maximum
control quality.
Requirements • Positioner set to automatic (manual wheel engaged)
Dosing pump to automatic
• Calibrated Cl
2
measurement (zero point and DPD value)
• Loop dead time < 60 min
• Loop rise time < 480 min (8 h) for 0–100 % measuring range
• Decomposition time < 480 min (8 h) of the current value to
20 % of the measuring range
• Correct menu setting of the end value, control direction (direct
or inverse), actuator (e.g. positioner), positioner running time
(Ty)
Adaption may not be started:
• If a large volume of fresh water is added
• If the chlorine sensor has not been run in
• During cleaning work
• During filter backwashing
• When the circulation changes
• If there are flow rate fluctuations
T i m e
%
T u
0 %
%
m g / l C l
2
m e a s u r e m e n t
1 0 0 % d o s i n g r a t e
%
T s
T i m e %
%