Partlow MIC 8200 Installation And Operation Manual page 38

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3.4.2 TUNE MODE
1. Manual Reset rSt should be set to 0 when performing the initial Auto Tune. This
parameter may be adjusted later, if desired.
2. Cycle Time for Output 1 Ct1 may need to be adjusted when using time proportioning
control. Typically the lowest cycle time settings result in the smoothest process
control. However, low cycle time will reduce the life of mechanical relays. For motor
modulation control, the cycle time setting must be the stroke time of the motor.
Adjusting the cycle time affects the instrument operation. Shorter cycle time causes
more accurate control and shorter life span of electro-mechanical components. Longer
cycle time causes less control accuracy and longer life span of electro-mechancial
components.
3. First Output Position deviation from setpoint FoP should be set to 0 when performing
the initial Auto Tune. This may be adjusted later, if desired .
4. Second Output Position deviation from setpoint SoP, depending upon the application,
may affect the process control response curve that is used by the Auto Tune
calculations. Set SoP to 0 when performing Auto Tune.
3.4.3 AUTO TUNE OPERATION
1. Select the Program and Tune mode parameters as necessary for the application as
described in this section.
2. Use the UP or DOWN key to select the setpoint 1 value for the application.
3. Press the AUTO TUNE key.
4. The lower display will show Atun to indicate that the Auto Tune function is operating.
When the Auto Tune function is complete, Atun will not be displayed.
5. Observe the process response, if any error codes appear, consult the Trouble-shooting
Section for the appropriate response (page 56).
6. If you wish to abort (stop) the Auto Tune, press the AUTO TUNE key once more. This
will cause Er58 to be displayed and the controller will operate as selected by the AAo
parameter.
7. For optimum control, some applications may require manual adjustments of the Tune
mode parameters.
8. When the Auto Tune function has completed and the process control is satisfactory,
you may wish to disable the Auto Tune function and the Tune mode to prevent
inadvertant changes to the tuning parameters.