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MODEL 54e pH/ORP SECTION 5.0
SOFTWARE CONFIGURATION
"Proportional" is short for Proportional Band and indicates the range
over which control is being used. It is the opposite of the process gain.
Smaller values provide tighter control.
"Integral" is the number of seconds over which deviations from the set-
point are integrated to remove continuing offsets. Smaller values provide
higher response.
"Derivative" is a form of control that resists all changes in readings.
Higher readings increase the derivative function. Use caution in setting
the derivative value to prevent process oscillation.
More information regarding PID control can be found in Section 7.0.
Setting these parameters may require some trial and error and should be
tested while the process is being supervised to prevent future upsets.
The rest of the PID output setup parameters are identical to those used
for normal outputs. See step 4a for details .
5. The Hold feature is used to prevent problems that may occur during
calibration if the current outputs are used for control. The feature is
turned on (enabled) here and is specifically configured in step 4. The
controller starts out with the hold feature turned off (disabled).
To enable the Hold feature, obtain the screen to the left with the hold
feature setup highlighted (see steps 1 and 2 for exact instructions).
Press Enter 4 and the screen below will appear.
Press the Edit 4 key to enable changes. Options include Disable,
Enable, and 20 minute timeout. When 20 minute timeout is selected, the
hold mode will automatically disengage after being on for 20 minutes.
Selecting Enable or 20 minute timeout does not actually put the controller
in hold, but rather allows putting the controller in hold when calibration is
conducted.
When the hold feature has been enabled, this Hold Mode Screen will
appear when the Calibrate routine is entered. Possible actions are Exit
1 which cancels the calibration, Enter 4 which enters the calibrate
menu without putting the controller in hold, and Edit 4 which allows
turning Hold Mode On. Note that when hold has been enabled, this
screen requires pushing Cont 3 to enter and leave the calibrate menu.
Fixed Hold: 21.00mA
Fault: 22.00mA
Exit Edit
Output 2 control
Output 2 setup
Hold feature setup
Exit Enter
Hold: Disable feature
Exit Edit
Hold Feature Setup
7.00
pH
Hold mode: Off
Exit Enter
5.6 CHANGING OUTPUT PARAMETERS (continued)
35