3-56 Commissioning – Documentation
FlexFit – Linkageless Control – Revision 1.0
PREFERRED
UTILITIES MFG CORPORATION
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decreasing the time between repeats the loop will have the ability to correct the error and return to the setpoint in an
acceptable amount of time.
• With the loop in automatic, observe how long it takes the process to return to setpoint.
• If the time is too long, lower the minutes per repeat by 50%.
• If the loop is constantly hunting while attempting to return to setpoint, increase the minutes per repeat by 50%.
Note: as integral is added, a higher proportional band may be desirable.
Step 5 – Be Patient: Don't be too quick to make an adjustment to the PB or integral. After making an adjustment, observe the
loop response through several upsets. When the tuning of the PID loop is complete, place the system in full automatic
under a normal plant load condition.
Remember that acceptable loop response is the opinion of the plant engineers and not that of the contractor doing the tuning. If
the best possible tuning is unacceptable to the plant engineers, the controlled devices and the red equipment should be reevaluated.
The rst indicator of the problem being found in the devices, red equipment, or the process itself, is to determine if the loop can be
operated in manual to the satisfaction of the plant demands. If the process cannot be controlled in manual, it will never be able to
be controlled in automatic. Objectivity and reason will best serve to resolve any issues encountered during the nal tuning process.
Documentation
The nal step in commissioning the FlexFit is completing the related documentation that will serve as a future reference and
proof that the important issues have been addressed.
Review all parameters that were utilized on the application and ensure that the settings are correct.
At the end of this manual are two forms that should be completed during the commissioning process and prior to leaving the boiler
plant. A digital copy of the FlexFit Edit le should also be kept. A copy of all as-left settings/data should be left with site personnel,
and a copy should be retained by the commissioning technician.
• Boiler Operating Data Sheet(s) – all servo curve and draft data
• Parameter Documentation Sheet – ll in the nal values of the parameters used
• Work Orders, Wiring Diagrams, Schematics, P&IDs, etc.
• Special instructions or outstanding work to be performed
• Any other settings, trip-points, safety limits, and comments related to other burner/boiler equipment
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