Limiting CV while maintaining controller in program mode

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    Jim Manley
    Jim Manley
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    Background

    We use steam for various tasks around the distillery.  Due to some things beyond our control, there are times when we have to limit the steam going to one piece of equipment while another piece of equipment is running.  At this point, this is being done by putting the PIDE in Override mode which disables the PIDE’s ability to do its control thing.  It also requires an operator to be on hand to manage temperatures, etc., which can lead to inconsistency in batches.

    Question: Is there a way to limit the output of CV while still allowing the PIDE to control the system?  The CV signal is a 4-20mA analog to a control valve.

    Would it be possible to create a second PIDE that sets CV=0% to 4mA and CV=100% to 8mA then set up controller logic that selects between the two versions of the PIDE based on which equipment is running?

    Thanks,

    Jim

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