Micromod Micro-DCI: 53SL5100A Single Loop Controller - Manual (Page 114)

Single Loop Process Controller Instruction Manual
106 Easy-Tune
11.4 EASY-TUNE Sequence Status
Once initiated, the algorithm sets the instrument to Manual mode. After a period of settling time, a step
change in instrument output is applied and the resulting process response is observed. As summarized in
Table 11-2 and Table 11-3 , datapoint 8387, EASY-TUNE Status, will numerically show the result of the
EASY-TUNE algorithm. Figure 11-1 illustrates this event sequence and correlates it to the numeric codes
in B387.
Table 11-2. Normal Successful Status Display
Step Procedure
1 Settling time and finding initial steady state values.
2 Initial step disturbance to the process.
3 Preliminary process characterization. (Disturbance is removed.)
4 Finding second steady state valies. (Disturbance is re-applied.)
5 Finding process characteristics. (Disturbance is removed.)
0 EASY-TUNE successfully completed.
Table 11-3. EASY-TUNE Unsuccessful Status Display
Step Procedure Suggested Action/Cause/Retry
51 lnstrument output was saturated Instrument output was saturated at the start.
52 Saturation would have occurred if EASY-TUNE
had continued. Reverse the sign of step size configured in
C381.
53 PV excursion exceeded the limit. Reduce the step size magnitude in C381 or
increase MAX PV excursion limit in C380.
54 Instrument output was altered externally, either
deliberately or accidentally. Refrain from changing output.
55 A time-out occurred when B387 was 1. lncrease the Digital Filter Index (B269) and/or
the Limiting Settling Time (C379).
56 A time-out occurred when B387 was 2. Increase the Limiting Settling Time (C379), or
increase Step Size Change in Controller Output
(C381), or decrease Excursion Limit for
Preliminary Step Disturbance (C378).
57 A time-out occurred when B387 was 3. Disturbance might have occurred during EASY-
TUNE sequence.
58 A time-out occurred when B387 was 4. Disturbance might have occurred during EASY-
TUNE sequence.
59 A time-out occurred when B387 was 5. Disturbance might have occurred during EASY-
TUNE sequence.