ASCON TECNOLOGIC - TLK33 - OPERATING INSTRUCTIONS -
PAG. 6
3) Exit from the parameter programming.
4) Connect the instrument to the controlled plant.
5) Activate the Auto-tuning by switch off and turn on the instrument
if “Auto”=1 or 2 , or by selecting par.
“tunE”
in the main menu (or
by correctly programming key “U” ).
At this point the Auto-tuning function is activated and is indicated by
the flashing led AT/ST.
The regulator carries out several operations on the connected plant
in order to calculate the most suitable PID parameters.
If, at the Auto-tuning start, the condition for the lower or higher
process value is not found the display will show
“ErAt”
and the
instrument will be swapped to normal control conditions according
to the previously programmed parameters.
To make the error “ErAt” disappear, press key P.
The Auto-tuning cycle duration has been limited to 12 hours
maximum.
If Auto-tuning is not completed within 12 hours, the instrument will
show
"noAt"
on the display
.
In case of probe error, the instrument automatically stops the cycle
in progress.
The values calculated by Auto-tuning are automatically stored in
the instrument’s memory at the end of the correct PID parameters
tuning.
Note :
The instrument is already programmed in our factory to carry
out auto-tuning at the first instrument switch on ("Auto" = 2).
To activate the SELF-TUNING function proceed as follows
1) Program and activate the desired Set Point.
2) Program par.
"SELF"
= yES
3) Exit from the parameter programming.
4) Connect the instrument to the controlled plant.
5) Activate Self-tuning selecting par.
“tunE”
in the main menu (or
by correctly programming key “U”).
When the Self-tuning function is active, the led AT/ST is
permanently lit up and all the PID parameters ("Pb", "Int", "dEr",
etc.) are no longer visualized.
Note :
It’s always preferable tuning the instrument using the
Autotuning and to activate the Selftuning after because the tuning
through Selftuning is more slow.
To stop the Auto-tuning cycle or deactivate the Self-tuning function
select one of the control types : "rEG", "OPLO" or "OFF" from the
menu “SEL”. If the instrument is switched off during Auto-tuning or
with the Self-tuning function activated, these functions will remain
activated the next time it is switched on.
4.8 - REACHING OF THE SET POINT AT CONTROLLED SPEED
AND AUTOMATIC SWITCHING BETWEEN TWO SET POINTS
(RAMPS AND DWELL TIME)
All the parameters referring to the ramps functioning are contained
in the group
“
]
rEG”.
It is possible to reach the set point in a predetermined time (in any
case longer than the time the plant would naturally need). This
could be useful in those processes (heating or chemical
treatments, etc.) where the set point has to be reached gradually, in
a predetermined time.
Once the instrument has reached the first Set Point (SP1) it is
possible to have automatic switching to the second Set Point (SP2)
after a set time, thus obtaining a simple automatic process cycle.
These functions are available for all the programmable controls
(PID single and double action, ON/OFF and Neutral Zone
ON/OFF).
The function is determined by the following parameters :
"SLor"
- Gradient of first ramp expressed in unit/minute
"SLoF"
- Gradient of second ramp expressed in unit/minute.
"dur.t"
- Dwell time of Set Point “SP1” before automatic switching
to Set Point “SP2” (expressed in hrs. and min.).
The functions are deactivated when the relative parameters are =
InF.
Note:
In case of PID control, if Auto-tuning is desired whilst the
ramp function is active, this will not be carried out until the tuning
cycle has been completed. It is therefore recommended that Auto-
tuning be started avoiding activating the ramp function and, once
the tuning is finished, deactivate Auto-tuning (“Auto” = OFF),
program the desired ramp and, if it automatic tuning is desired,
enable the Self-tuning function.
If is desired only one ramp (ex. to reach “SP1”) it is enough to
program on the par. "SLor" the desired value.
The ramp "SLor" it will always active at power on and when the
Active Set Point value is changed.
S P 1
[U n it]
P V
S P 1 V a lu e
c h a n g e
S P 1
tim e [m in .]
S L o r
S L o r
If it is desired an automatic cycle from the power on instead it is
necessary to program the par. "nSP" = 2, to program the two Set
Point values "SP1" and "SP2" and naturally to program the par.
"SLor", "dur.t" and "SLoF" with the desired values.
In this case at the end of the cycle all the ramps won't be more
active.
[ U n it ]
S P 1
P V
A U T O
c h a n g e
S e t
d u r . t
S P 2
t im e [ m in . ]
S L o r
S L o F
Examples with starts from values lower than SP and with
decreasing of SP.
4.5 - ALARMS OUTPUTS FUNCTIONS (AL1, AL2)
The instrument can have up to 2 alarm outputs to drive solid state
relays type (SSR).
All the parameters referring to the alarms functioning are contained
in the groups
“
]
AL1”
and
“
]
AL2”.
Note:
In all the examples that follow is made reference to the alarm
AL1. Naturally the operation of the alarm AL2 results analogous.
The alarm functioning is instead defined by parameters :
"AL1t "
- ALARM TYPE
"Ab1"
- ALARM CONFIGURATION
“AL1”
- ALARM THRESHOLD
“AL1L”
- LOW ALARM THRESHOLD (for band alarm) OR
MINIMUM SET OF AL1 ALARM THRESHOLD (for low or high
alarm)
“AL1H”
- HIGH ALARM THRESHOLD (for band alarm) OR
MAXIMUM SET OF AL1 ALARM THRESHOLD (for low or high
alarm)
“HAL1” -
ALARM HYSTERESIS
“AL1d”
- ALARM ACTIVATION DELAY (in sec.)
"AL1i"
-
ALARM
BEHAVIOUR
IN
THE
EVENT
OF
MEASUREMENT ERROR
"AL1t" – ALARM TYPE :
the alarm output can behave in six
different ways.
LoAb
= ABSOLUTE LOW ALARM: The alarm is activated when the
process value goes below the alarm threshold set on parameter
"AL1” and will be deactivated when it goes above the value
[AL1+HAL1].
With this mode is possible to program the minimum and the
maximum set of “AL1” by “AL1L” and “AL1H” parameters.
HiAb
= ABSOLUTE HIGH ALARM: The alarm is activated when the
process value goes higher than the alarm threshold set on
parameter "AL1" and will be deactivated when it goes below the
value [AL1 - HAL1].