106
Chapter 7
535-PROF User's Manual
Applications
11. When Pretune is complete, the 3rd display will show COMPLETED for two
seconds and then return to the current menu display.
The controller will automatically transfer to automatic control upon
completion of Pretune if set to do so, or upon manual transfer.
Figure 7.13 illustrates the operation of Pretune TYPE 1 with Adaptive Tune.
Pretune TYPE 2 or 3 & Adaptive Tune
1. Go to the
SELF TUNE
menu.
2. Set the
TYPE
parameter to BOTH.
3. Set the
PRETUNE
parameter to TYPE 2 or TYPE 3.
4. Enter a value for parameter
OUT. STEP
.
5.
DO NOT
Enter values for
NOISE BND
and
RESP TIME
. The Pretune
algorithm will calculate these values.
6. Make sure that the process is reasonably stable and place the controller
under manual control.
7. Press
MENU
to access the
TUNING
menu.
8. Set parameter
ADAPTIVE
to ENABLED. The Adaptive Tuning cycle does
not begin the controller is under automatic control.
9. Activate the next parameter,
PRETUNE
.
10. Press
and then ACK
to begin Pretuning.
The 3rd display will show the message EXECUTING.
11. When Pretune is complete, the 3rd display will show COMPLETED for two
seconds and then return to the current menu display.
The controller will automatically transfer to automatic control upon completion
of Pretune if set to do so, or upon manual transfer.
Figure 7.13 illustrates the operation of Pretunes TYPE 2 and TYPE 3 with
Adaptive Tune.
Adaptive Tune by Itself
1. Go to the
SELF TUNE
menu.
2. Set the
TYPE
parameter to ADAPTIVE.
3. Press
MENU
to access the
TUNING
menu.
3. Enter values for
NOISE BND
and
RESP. TIME
(as described below).
4. Set the
ADAPTIVE
parameter to ENABLED. The Adaptive Tuning cycle does
not begin the controller is under automatic control.
If Pretune results are poor or process conditions do not
allow Pretune to run:
Adaptive Tune parameters can be manually configured. Proper setting of the
noise band and response time parameters will yield excellent adaptive control
without running the Pretune function.
1. Go to the
SELF TUNE
menu.
2. Set
NOISE BND
.
The noise band is chosen to distinguish between disturbances which affect
the process and process variable “noise.” The controller functions to
CAUTION!
If the process conditions are
temporarily changed, (e.g., during
process shutdown, draining of a tank,
etc.)
disable adaptive tuning.
Otherwise, the controller will attempt
to adapt its tuning parameters to the
temporary process conditions.
Disable adaptive tuning by:
1. In the
TUNING
menu, change
ADAPTIVE
to DISABLED through
the keypad; or
2. Closing the appropriate digital
input (see Digital Input section in
this chapter).
NOTE:
Adaptive tuning is
not
available for velocity position
proportional control.
