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DOTX-45 Dissolved Oxygen System Part 6 – Configuration

DOTX-45 38 -

though the controller can achieve 0% or 100% anywhere

within the range.)

If the 0% point is lower than the 100% point, then the

controller action will be “reverse” acting. That is, the output

of the controller will increase if the measured value is less

than the setpoint, and the output will decrease if the

measured value is larger than the setpoint. Flipping the

stored values in these points will reverse the action of the

controller to “direct” mode.

The entry value is limited to a value within the range

specified in “Set Range”, and the 0% and the 100% point

must be separated by at least 1% of this range Use the

LEFT arrow key to select the first digit to be modified. Then

use the UP and LEFT arrow keys to select the desired

numerical value. Press ENTER to store the new value.

PID Setpnt

[Iout1=PID] The measured value which the controller is attempting to

maintain by adjusting output value. It is the nature of the

PID controller that it never actually gets to the exact value

and stops. The controller is continually making smaller and

smaller adjustments as the measured value gets near the

setpoint.

PID Prop

[Iout1=PID] Proportional gain factor. The proportional gain value is a

multiplier on the controller error (difference between

measured value and setpoint value.) Increasing this value

will make the controller more responsive.

PID Int

[Iout1=PID] Integral is the number of “repeats-per-minute” of the action

of the controller. It is the number of times per minute that

the controller acts on the input error. At a setting of 2.0 rpm,

there are two repeats every minute. If the integral is set to

zero, a fixed offset value is added to the controller (manual

reset.) Increasing this value will make the controller more

responsive.

PID Deriv

[Iout1=PID] Derivative is a second order implementation of Integral, used

to suppress “second-order” effects from process variables.

These variables may include items like pumps or mixers that

may have minor impacts on the measured value. The

derivative factor is rarely used in water treatment process,

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Dot-x SERIES Spécifications Page 39

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