Table 17-2. Easy-Tune Parameters - ABB ControlIT 53MC5000 Instruction Manual

Table 17-2. EASY-TUNE Parameters

Item Data-
points
1 L520 Enable Tuning Parameter Limits
0 - no limits checked, 1 - limits below apply
C385 lowest % PB
C386 highest % PB
C387 lowest TR (minutes)
C388 highest TR (minutes)
C389 lowest TD (minutes)
C390 highest TD (minutes)
2 L521 Abort EASY-TUNE Switch
0 - no effect, 1 - EASY-TUNE is aborted
3 L522 Automatic Tuning Parameter
1 - upon successful completion of the EASY-TUNE sequence,
new tuning parameters will be entered.
0 - new tuning parameters will not be entered but available for review.
4 B008 Enable EASY-TUNE
5 B385 Control Module Selector (CON-0 = 0, CON-1 = 1, CON-2 = 2, CON-3 =
3)
6 B386 PID Control Mode
1 - P, 2 - PI, 3 - PID, 4 - PD, 5 - I
If the ratio of Process Dead Time (Wp) and Process Time Constant (Tp)
is greater than 0.5, then this datapoint should be set to 3 for PID Control
Mode.
7 C378 Excursion Limit for Preliminary Step Disturbance (%)
The step size chosen for C381 will cause a PV change which depends
on the process gain as well as C381 itself. C378 should be set to
approximately 1/4 of that expected change. (See C381 below.)
8 C379 Limiting Settling Time (seconds)
Set to maximum time allowed during B387 = 1 or 2. (See Table 17-3
and Figure 17-1.)
9 C380 Maximum Allowable Excursion of PV in EASY-TUNE (%)
Setting C380 will prevent excessive change in PV.
10 C381 Step Size Change in Controller Output (± %)
Set large enough to cause significant but allowable PV changes.
(See C378 above.)
11 Modifiers to Tuning Criteria (see sub-section 17.5)
C382 T Time Constant modifier
P
C383 K Process Gain modifier
P
C384 W Dead-Time modifier
P
12 EASY-TUNE Results (display only):
C391 T Time Constant (seconds)
P
C392 K Process Gain
P
C393 W Dead-Time (seconds)
P
C394 % PB
C395 T (minutes)
R
C396 T (minutes)
D
17-2
53MC5000 Process Control Station
Description Default
Value
1
2
500
0
30
0
10
0
0
0
0
0
2
0
0
0
0.1
0.1
0.1
0
0
0
0
0
0