DCP200 Profile Controller & Recorder - Product Manual

Fine Tuning.

A separate cycle time adjustment parameter is provided for the Primary and Secondary control when using time proportioning control outputs.

Note:

Adjusting the cycle time affects the controllers operation; a shorter cycle time gives control that is more accurate, but mechanical components such as relays will have a reduced life span.

1.Increase the width of the proportional band if the process overshoots or oscillates excessively.

2.Decrease the width of the proportional band if the process responds slowly or fails to reach setpoint.

3.To find the optimum value for the Integral Time, decrease its value until the process becomes unstable, then increase it a little at a time, until stability has is restored. Induce a load disturbance or make a setpoint change to verify that the process stabilises. If not increase the value some more and re-test.

Note:

Allow enough time for the controller and process to adjust between changes.

4.Initially add Derivative at a value between 1/4th and 1/10th of the Integral Time value.

5.Increase the Derivative Time if the process overshoots/undershoots, increase its value a little at a time, if the process becomes unstable, until the oscillation stops. Induce a load disturbance or make a setpoint change to verify that the process stabilises. If not decrease the value some more and re-test.

Note:

When controlling a modulating valve, it is recommended that Derivative is set to OFF to avoid excessive valve activity. Derivative can cause process instability in these processes.

6.After making all other adjustments, if an offset exists between the setpoint and the process variable use the Bias (manual reset) to eliminate the error:

Below setpoint - use a larger value

Above setpoint - use a smaller value.

51-52-25-150, Issue 1 – April 2009

Manual Tuning

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Honeywell DCP200 manual Fine Tuning
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DCP200 specifications

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