Honeywell UDC 3300 manual is a list of rules for Accutune, Rules, How Tune demand tuning works

Rules

TUNE

X

X

X

X

X

X

X

X

X

Table 5-34 is a list of rules for Accutune.

Table 5-34 Accutune Rules and Regulations

SP* Applicable Rule

TUNE On Demand tuning will work for all control algorithms except ON/OFF. Process line out is not required.

TUNE On Demand tuning works for integrating processes.

XSP tuning will work only for algorithm PID a or PID B selections; i.e., it will NOT work with ON/OFF, Three Position Step, or PD+MR control algorithms.

XSP tuning can tune on all local or computer setpoints except ramping setpoints; i.e., cannot be done during SP Ramp or SP Program or when using remote setpoint.

XTuning is done in automatic mode.

XTuning can be monitored or reconfigured using communications option.

XTuning can be enabled via digital inputs.

XTuning can be aborted by going to manual mode or disabling via configuration.

XWhen tuning is in progress, a large T appears in the upper display and disappears as soon as tuning is completed.

XCan tune two independent loops.

Setpoint changes can be made during operation. The setpoint at the time tuning starts is captured and Tune runs until completion, then proceeds to the new SP value following the completion of tuning.

*SP ADAPT not available on Basic Model DC330B

How TUNE (demand) tuning works

TUNE tuning provides virtually foolproof, trouble-free on-demand tuning in the UDC 3300 controller. No knowledge of the process is required at start-up. The operator simply enters the desired setpoint and initiates the tuning.

The controller immediately starts controlling to the setpoint while it identifies the process, calculates the tuning constants and enters them into the Tuning group, and begins PID control with the correct tuning parameters. This works with any process, including integrating type processes, and allows returning at a fixed setpoint.

The tuning sequence will cycle the controller’s output two full cycles between 0 % and 100 % (or configured output limits) while allowing only a very small process variable change above and below the SP during each cycle. The algorithm then calculates new tuning parameters and enters them into the Tuning group. A large T appears in the upper display while tuning is active.

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