Micromod MOD: Modcell 2050R Users Guide Manual de usuario descargar pdf (Pagina 171)

IB-23C650

TUNING

Table 13. Autotune Procedure

Middle

Display

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Entry Description

INCREASE STEP SIZ

The ratio of process oscillation to hysteresis

value is too small for best results. Check tun-

ing constants. If desired, restart autotune with

a larger output step size or a smaller hysteresis

value. Hysteresis must be at least equal to,

and preferably greater than, process noise.

RESPONSE LIMITED The controller is using the high limit for

proportional band or reset. Check tuning

constants. The controller is using the newly

calculated constants. Because of process

characteristics, restart is not likely to improve

tuning constant calculations.

AUTOTUNE FAILED Autotune execution has been canceled, the

controller is in manual, and the output is at the

starting output value. A

PROCESS TOO

SLOW

, or a DECREASE STEP SIZ message

follows.

PROCESS TOO SLOW Autotune will not work on this process because

it is too slow.

DECREASE STEP SIZ The process has exceeded one of the

configured process trip-points. Restart

autotune with a smaller output step size or

expand the high and low trip-point of the

process variable.

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Micromod MOD: Modcell 2050R Users Guide Manual de usuario Pagina 171