Table 17-2. EASY-TUNE Parameters
Item
Data-
points
Description Default
Value
1L520
C385
C386
C387
C388
C389
C390
Enable Tuning Parameter Limits
0 - no limits checked, 1 - limits below apply
lowest % PB
highest % PB
lowest TR (minutes)
highest TR (minutes)
lowest TD (minutes)
highest TD (minutes)
1
2
500
0
30
0
10
2 L521 Abort EASY-TUNE Switch
0 - no effect, 1 - EASY-TUNE is aborted
0
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.
0
4 B008 Enable EASY-TUNE 0
5 B385 Control Module Selector (CON-0 = 0, CON-1 = 1, CON-2 = 2, CON-3 =
3)
0
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.
0
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.)
2
8 C379 Limiting Settling Time (seconds)
Set to maximum time allowed during B387 = 1 or 2. (See Table 17-3
and Figure 17-1.)
0
9 C380 Maximum Allowable Excursion of PV in EASY-TUNE (%)
Setting C380 will prevent excessive change in PV.
0
10 C381 Step Size Change in Controller Output (
±
%)
Set large enough to cause significant but allowable PV changes.
(See C378 above.)
0
11
C382
C383
C384
Modifiers to Tuning Criteria (see sub-section 17.5)
T
P
Time Constant modifier
K
P
Process Gain modifier
W
P
Dead-Time modifier
0.1
0.1
0.1
12
C391
C392
C393
C394
C395
C396
EASY-TUNE Results (display only):
T
P
Time Constant (seconds)
K
P
Process Gain
W
P
Dead-Time (seconds)
% PB
T
R
(minutes)
T
D
(minutes)
0
0
0
0
0
0
53MC5000 Process Control Station
17-2
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