ABB ControlIT 53MC5000 User Manual

17.4 EASY-TUNE SEQUENCE STATUS
Once initiated, the algorithm sets the controller to Manual mode. After a period of settling time, a
step change in controller output is applied and the resulting process response is observed. As
summarized in Tables 17-3 and 17-4, datapoint B387, EASY-TUNE Status, will numerically show
the result of the EASY-TUNE algorithm. Figure 17-1 illustrates this event sequence and correlates
it to the numeric codes in B387.
Table 17-3 Normal Successful Status Display
B387 Description
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 values. (Disturbance is re-applied.)
5 Finding process characteristics. (Disturbance is removed.)
0 EASY-TUNE successfully completed.
Table 17-4. EASY-TUNE Unsuccessful Status Display
B387 Description Suggested Action/Cause/Retry
51 Controller output was saturated Controller 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 Controller output was altered
externally, either deliberately or
aDIdentally.
Refrain from changing output.
55 A time-out occurred when B387 was 1. Increase 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.
60 Abort EASY-TUNE Switch, L521 was
set to 1.
EASY-TUNE was aborted.
61 Tuning parameter limits were
exceeded and used in the controller.
Widen the tuning parameter limits in C385 - C390
or set Enable Tuning Parameter Limits, L520 to 0.
Section 17. EASY-TUNE
17-3

ABB ControlIT 53MC5000 Specifications

General

Brand	ABB
Model	ControlIT 53MC5000
Category	Controller
Language	English