{"id":3430,"date":"2019-02-12T16:09:11","date_gmt":"2019-02-12T16:09:11","guid":{"rendered":"https:\/\/cyflexdoc.wpengine.com\/usage-help-manual\/11-control-systems\/autotune\/"},"modified":"2025-08-28T13:35:37","modified_gmt":"2025-08-28T18:35:37","slug":"autotune","status":"publish","type":"page","link":"https:\/\/cyflex.com\/index.php\/usage-help-manual\/7-control-systems\/autotune\/","title":{"rendered":"autotune"},"content":{"rendered":"
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Purpose:<\/h3>\n<\/div>\n
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Initiate tuning of a specified PID loop using the Ziegler-Nichols method (closed loop version – with relay caused oscillations). Note that the length of time to autotune is dependent on the period of oscillation of the system. Ten to twenty oscillations will be required\u2026sometimes more if the system is not well behaved.<\/p>\n

If results are not achieved after some time period use the ‘abort_autotune’ command to terminate the autotune session.<\/p>\n

When completed, the control task prints many items, including:
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Ultimate gain
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Number of cycles
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Period for cycles<\/p>\n

New gains will be suggested but not implemented.<\/p>\n

IMPORTANT: Before starting, make sure the controller output is near the midpoint of allowed values.<\/p>\n<\/dd>\n<\/dl>\n

Enter:<\/h3>\n
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autotune<\/strong> <controller><\/p>\n<\/dd>\n<\/dl>\n

Where:<\/h3>\n
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controller<\/p>\n<\/td>\n

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Specify the loop or controller to autotune:<\/p>\n