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Bumpless Control When Shifting from 3 Element to Single Element
Achieving bumpless control when shifting from three element to single element in element control logic

For boiler 3 element control using Allen Bradly control logix PLC. How we can achieve bumpless control when we shift from three element to single element in boiler 3 element control logic?

>For boiler 3 element control using Allen Bradly control
>logix PLC. How we can achieve bumpless control when we shift
>from three element to single element in boiler 3 element
>control logic?

You can use the Maximum and minimum output limits or max and min CV values to make a non-active loop, track the active loop.
Use small offsets to calculate the max and min values from the tracked output.

When the loop is in control set the max and min limits to 100% and 0%.

These parameters are listed in the General Instructions Reference Manual;
http://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1756-rm003_-en-p.pdf