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11 Appendix
Separate controllers
This function is normally deactivated (factory setting or "No" selection).
In the deactivated state, the software prevents the two controller outputs from
being able to work "against each other". So, for example, it is not possible to
dose acid and lye at the same time.
If the controllers are separate ("Yes" selection), each controller can be freely
configured.
I-component switch-off
This function is normally deactivated (factory setting or "No" selection).
In the deactivated state, the controller works in accordance with general con-
troller theory.
When I-component switch-off is activated ("Yes" selection), the part of the out-
put level that can be traced back to the I-component is set to zero when the
setpoint is reached.
This can be useful with mutual neutralization (acid and lye dosing both possi-
ble) in one treatment tank.
Wash timer
The wash timer can be used to implement automated sensor cleaning. This
function is assigned to a switching output (1 or 2) for that purpose.
The cycle duration (cleaning interval) can be adjusted in the range from 1 to
240 hours. The wash duration (cleaning duration) is adjustable from 1 to 1800
seconds. During the wash duration the controller goes into the HOLD state,
which is maintained for 10 seconds after completion of the wash duration. A
sensor calibration within the cycle duration restarts the wash timer.
The wash timer is deactivated with the "0" cycle duration.
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