ATI
Q46D-ODO Optical D.O. System
Part 5 – Configuration
39
O&M Manual
Rev-J (8/17)
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,
and therefore, it is best in most cases to leave it at the
default value. Increasing this value will make the controller
more responsive.
Set 4 mA
Set 20 mA
[Iout1=D.O.]
These functions set the main 4 and 20 mA current loop
output points for the transmitter. The units displayed depend
on the selection made in the CONFIG menu for Iout #1
Mode. Also, when the Relay Option Board is installed, the
units will also display #
1 or #2
– since there are actually two
analog outputs present in this version.
The value stored for the 4 mA point may be higher or lower
than the value stored for the 20 mA point. The entry values
are limited to values within the range specified in “Set
Range”, and the 4 mA and the 20 mA 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.
