INDEX

TLK 94 1
1.1
1.2
2
2.1
INSTRUMENT DESCRIPTION
GENERAL DESCRIPTION
FRONT PANEL DESCRIPTION
PROGRAMMING
FAST PROGRAMMING OF THE SET POINT
2.2 SELECTION OF CONTROL STATE AND PARAMETERS
MICROPROCESSOR-BASED PROGRAMMING
2.3 PARAMETER PROGRAMMING LEVELS
DIGITAL 2.4 CONTROL STATES
2.5 ACTIVE SET POINT SELECTION
ELECTRONIC CONTROLLER 3 INFORMATION ON INSTALLATION AND USE
3.1 PERMITTED USE
3.2 MECHANICAL MOUNTING
3.3 ELECTRICAL CONNECTIONS
3.4 ELECTRICAL WIRING DIAGRAM
4 FUNCTIONS
4.1 MEASURING AND VISUALIZATION
4.2 OUTPUT CONFIGURATION
4.3 ON/OFF CONTROL
4.4 NEUTRAL ZONE ON/OFF CONTROL
4.5 SINGLE ACTION PID CONTROL
4.6 DOUBLE ACTION PID CONTROL
4.7 PID CONTROL FOR MOTORIZED ACTUATORS WITH
TIME POSITIONING
4.8 AUTO-TUNING AND SELF-TUNING FUNCTIONS
4.9 CONTROL POWER LIMITATION
4.10 LIMITATION OF THE CONTROL POWER VARIATION
SPEED (MAXIMUM RATE OF RISE)
4.11 SPLIT RANGE FUNCTION
4.12 REACHING OF SET POINT AT CONTROLLED SPEED
AND AUTOMATIC COMMUTATION BETWEEN TWO
SET POINTS
4.13 SOFT-START FUNCTION
4.14 ALARMS OUTPUTS FUNCTIONS
OPERATING INSTRUCTIONS 4.15 HEATER BREAK ALARM FUNCTION
Vr. 01 (ENG) - 01/10 4.16 LOOP BREAK ALARM FUNCTION
cod.: ISTR-MTLK94ENG1 4.17 FUNCTION OF KEY “U”
4.18 DIGITAL INPUTS
4.19 RS 485 SERIAL INTERFACE
TECNOLOGIC S.p.A. 4.20 PARAMETERS CONFIGURATION BY A01
5 PROGRAMMABLE PARAMETERS TABLE
6 PROBLEMS , MAINTENANCE AND GUARANTEE
VIA INDIPENDENZA 56 6.1 ERROR WARNINGS
27029 VIGEVANO (PV) ITALY 6.2 CLEANING
TEL.: +39 0381 69871 6.3 GUARANTEE AND REPAIRS
7 TECHNICAL DATA
FAX: +39 0381 698730 7.1 ELECTRICAL DATA
internet : http:\\www.tecnologic.it 7.2 MECHANICAL DATA
e-mail: info@tecnologic.it 7.3 MECHANICAL DIMENSIONS, PANEL CUT-OUT AND
MOUNTING
7.4 FUNCTIONAL DATA
FOREWORD 7.5 MEASURING RANGE TABLE
This manual contains the information 7.6 INSTRUMENT ORDERING CODES
necessary for the product to be installed
correctly and also instructions for its 1 - INSTRUMENT DESCRIPTION
maintenance and use; we therefore recommend
that the utmost attention is paid to the following 1.1 - GENERAL DESCRIPTION
instructions and to save it. TLK 94 is a “single loop” digital microprocessor-based controller,
This document is the exclusive property of TECNOLOGIC with ON/OFF, Neutral Zone ON/OFF, PID single action, PID dual
S.p.A. which forbids any reproduction and divulgation , even action (direct and reverse) control, PID for motorized actuators with
in part, of the document, unless expressly authorized. time positioning control. The instrument is equipped with
TECNOLOGIC S.p.A. reserves the right to make any formal or AUTO-TUNING function (FAST or OSCILLATING type),
functional changes at any moment and without any notice. SELF-TUNING function and automatic calculation of the FUZZY
Whenever a failure or a malfunction of the device may cause OVERSHOOT CONTROL parameter for PID control. The PID
dangerous situations for persons, thing or animals, please control has a particular algorithm with TWO DEGREES OF
remember that the plant has to be equipped with additional FREEDOM that optimises the instrument’s features independently
devices which will guarantee safety. of the event of process disturbances and Set Point variations.
Furthermore, the instrument allows for RS485 serial
Tecnologic S.p.A. and its legal representatives do not assume
communication using MODBUS-RTU communication protocol and
any responsibility for any damage to people, things or animals
a transmission speed up to 38.400 baud. The process value is
deriving from violation, wrong or improper use or in any case visualized on 4 red displays, the Set value is visualized on 4 green
not in compliance with the instrument’s features . displays while the outputs status is indicated by 6 leds. The

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 instrument provides for the storage of 4 Set Points and can have 2 - PROGRAMMING
up to 6 outputs : relay type or can drive solid state relays type
(SSR), or it is also possible to have up to 2 analogue outputs. 2.1 - FAST PROGRAMMING OF THE SET POINT
The input is programmable and accepts temperature probes This procedure permits rapid programming of the active Set Point
(Thermocouples J,K,S,B,C,E,L,N,R,T; Thermo-resistances PT100, and possibly the alarm thresholds (see par 2.3)
Thermistors PTC and NTC; Infrared sensors mod. TECNOLOGIC Push key “P”, then release it and the display will visualise “SP n”
IRS) and normalized analogue signals (0/4..20 mA, 0/1..5 V, (where n is the number of the Set Point active at that moment) and
0/2..10 V, 0..50/60 mV, 12..60 mV). The instrument have 2 the programmed value.
programmable digital inputs for free voltage contacts and can be To modify the value, press “UP” key to increase it or the “DOWN”
equipped with an input for the current transformer, working as a key to decrease it.
Heater Break Alarm function. Other important available functions These keys change the value one digit at a time but if they are
are: Loop-Break Alarm function, control power limitation, limitation pressed for more than one second, the value increases or
of the variation speed of the control power, split-range, reaching of decreases rapidly and, after two seconds in the same condition,
the Set Point at controlled speed, ramp and dwell function, the changing speed increases in order to allow the desired value to
Soft-Start function, parameters protection on different levels. be reached rapidly.
Once the desired value has been reached, by pushing key P it is
1.2 - FRONT PANEL DESCRIPTION possible to exit by the fast programming mode or it is possible to
visualise the alarm thresholds AL1, AL2, AL3, AL4 (see par. 2.3).
6 7 To exit the fast Set programming it is necessary to push key P,
Out1 Out2 Out3 Out4 Out5 after the visualisation of the last Set Point, or alternatively, if no key
5 9 is pressed for approx. 15 seconds, the display will return to normal
functioning automatically.
13 PV 8 2.2 - SELECTION OF THE CONTROL STATE AND
TUN
PARAMETERS PROGRAMMING
14 12 By pushing key "P" and holding it down for approx. 2 sec. it is
SV possible to enter into the main selection menu.
SET 11
10
"rE G "
Out6

4 3 H old fo r
2 s ec .

1 2

TLK 94

1 - Key P : This is used to access the programming parameters

and to confirm selection. "O F F "
2 - Key DOWN : This is used to decrease the values to be set and
to select the parameters. If the key is held down, the user returns to
the previous programming level until he exits the programming
mode. Outside the programming mode it permits visualisation of A U T O T U N IN G
the current measured by the TAHB input, on the SV display. S E L F T U N IN G

3 - Key UP : This is used to increase the values to be set and to

select the parameters. If the key is held down, the user returns to
the previous programming level until he exits the programming
mode. Outside the programming mode it permits visualisation of "O P L O "
the output control power, on the SV display.
4 - Key U : This is a key with a function programmable by par.
“USrb”. It can be set to : Activate Auto-tuning and Self-tuning
functions, swap the instrument to manual control, silence the
alarm, change the active Set Point, deactivate control (see par.
Using the "UP" or DOWN” keys, it is then possible to roll over the
4.17) and modify the visibility of the parameters in “ConF” menu
selections:
(see par. 2.3).
5 - Led OUT1 : indicates the state of output OUT1 "OPEr" to enter into the operating parameters menu
6 - Led OUT2 : indicates the state of output OUT2 "ConF" to enter into the configuration parameters menu
7 - Led OUT3 : indicates the state of output OUT3 "OFF" to swap the regulator into the OFF state
8 - Led OUT4 : indicates the state of output OUT4 "rEG" to swap the regulator into the automatic control state
9 - Led OUT5 : indicates the state of output OUT5 "tunE" to activate the Auto-tuning or Self-tuning function
10 - Led OUT6 : indicates the state of output OUT6 "OPLO" to swap the regulator to the manual control state and
11 - Led SET : it indicates access to the programming mode and therefore to program the % control value using the
the parameters level (see par. 2.3). “UP” and “DOWN” keys
12 - Led TUN : indicates that the Self-tuning function is activated Once the desired item has been selected, push key “P” to confirm.
(light on) or that Auto-tuning (flashing ) is in progress. Selecting "OPEr" and "ConF" gives the possibility of accessing
13 - Display PV: normally indicates the process value other menus containing additional parameters and more precisely :
14 - Display SV: normally indicates the active Set value, however it "OPEr" – Operating parameters Menu: this normally contains the
can be programmed, using par. “diSP”, to visualize other values. Set Point parameters but it can contain all the desired parameters
(see par. 2.3).

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 "ConF" – Configuration parameters Menu: this contains all the =SE : The active Set Point can be modified while the alarm
operating parameters and the functioning configuration parameters thresholds cannot be modified.
(alarm configuration, control, input, etc.) =AE : The active Set Point cannot be modified while the alarm
To enter the menu “ConF” select the option “ConF”, press the key thresholds can be modified
“P” and the display will show “0”. =SAE : Both the active Set Point and the alarm thresholds can be
At this request, enter, using keys “UP” and “DOWN”, the number modified
reported on the last page of this manual and push key “P”. =SAnE : Both the active Set Point and the alarm thresholds cannot
If an incorrect password is entered, the instrument exit from be modified
programming mode.
If the password is correct, the display will visualise the code 2.4 - CONTROL STATE
identifying the first group of parameters (“ ]SP “) and with keys “UP” The controller can act in 3 different ways : automatic control (rEG),
and “DOWN” it will be possible to select the desired group of control off (OFF) and manual control (OPLO).
parameters. The instrument is able to pass from one state to the other :
Once the desired group of parameters has been selected, the code - by selecting the desired state from the main selection menu suing
identifying the first parameter of the selected group will be the keyboard.
visualised by pushing the “P” key. - By using the key “U” on the keyboard; suitably programming par.
Again using the “UP” and “DOWN” keys, it is possible to select the “USrb” (“USrb” = tunE; “USrb” = OPLO; “USrb” = OFF) it is possible
desired parameter and, if the key “P” is pressed, the display will to pass from “rEG” state to the state programmed on the parameter
show the parameter’s code and its programming value, which can and vice versa.
be modified by using the “UP” or “DOWN” keys. - Automatically (the instrument swaps into "rEG" state at the and of
Once the desired value has been programmed, push key “P” once the auto-tuning execution)
more: the new value will be memorised and the display will show When switched on, the instrument automatically reassumes the
only the code of the selected parameter. state it was in when it was last switched off.
By using the “UP” or “DOWN” keys, it is then possible to select a AUTOMATIC CONTROL (rEG) – Automatic control is the normal
new parameter (if present) and modify it as described above. functioning state of the controller.
To select another group of parameters, keep the “UP” or “DOWN” During automatic control, on the SV display, it is possible to
key pressed for approx. 2 sec., afterwards the display will return to visualize the control power on the display by pushing key “UP”.
visualise the code of the group of parameters. The range of the power values goes from H100 (100% of the
Release the key and by using the “UP” and “DOWN” keys, it will be output power with reverse action) to C100 (100% of the output
possible to select a new group. power with direct action).
To exit the programming mode, no key should be pressed for CONTROL OFF (OFF) – The instrument can be swapped into the
approx. 20 seconds, or keep the “UP” or “DOWN” pressed until exit “OFF” state, i.e. the control and the relative outputs are
from the programming mode is obtained. deactivated.
The programming and exit modes for the “OPEr” menu are the The alarm outputs are instead working normally.
same as those described for menu “ConF” with the difference that BUMPLESS MANUAL CONTROL (OPLO) – By means of this
to access the menù "OPEr" the Password is not required. option it is possible to manually program the power percentage
given as output by the controller by deactivating automatic control.
When the instrument is swapped to manual control, the power
percentage, visualised on the SV display, is the same as the last
one supplied and can be modified using the “UP” and “DOWN”
keys.
Hold for In case of ON/OFF control, 0% corresponds to the deactivated
2 sec.
output while any value different from 0 corresponds to the activated
Hold for
2 sec.
Hold
Longer output.
As in the case of visualization, the programmable values range
from H100 (100% output power with reverse action) to C100 (100%
output power with direct action).
ATTENTION: The instrument is programmed in factory with all the In case of motorized actuators with time positioning, the manual
parameters, to exception of the Set Point "SP1" (and 2,3,4), control of the output is obtainable in the following way :
programmable in the menù "ConF" to the purpose to prevent wrong - By pushing the UP key, the opening of the actuator is driven
accidental programming from non experienced consumers. - By pushing DOWN key, the closing of the actuator is driven
For all time during which the manual control is active, “3 Pt” or
2.3 - PARAMETERS PROGRAMMING LEVELS “OPEn” is visible on the lower display if the UP key is pressed or
The menu “OPEr” normally contains the parameters used to “CLOS” if the DOWN key is pressed.
program the Set Point; however it is possible to make all desired To return to automatic control, select "rEG" in the selection menu.
parameters appear or disappear on this level, by following this
procedure: 2.5 - ACTIVE SET POINT SELECTION
Enter the menu “ConF” and select the parameter to be made This instrument permits pre-programming of up to 4 different Set
programmable or not programmable in the menu “OPEr”. points (“SP1”, “SP2”, “SP3”, “SP4”) and then selection of which
Once the parameter has been selected, if the LED SET is switched one must be active. The maximum number of Set points is
off, this means that the parameter is programmable only in the determined by the par. "nSP" located in the group of parameters “
]
menu “ConF”, if instead the LED is on, this means that the SP “.
parameter is also programmable in the menu “OPEr”. The active Set point can be selected :
To modify the visibility of the parameter, push key “U” : the LED - by parameter "SPAt" in the group of parameters “ ]SP “.
SET will change its state indicating the parameter accessibility level - by key “U” if par. "USrb" = CHSP
(on = menu ”OPEr” and “ConF”; off = menu “ConF” only). - by digital input if par. “diF” = CHSP or = SP1.2 or =HECo)
The active Set Point and the alarm thresholds will only be visible on - Automatically between SP1 and SP2 if a time “dur.t” (see par.
the Set Point fast programming level (described in par. 2.1) if the 4.12) has been programmed.
relative parameters are programmed to be visible (i.e. if they are Set Points “SP1”, “SP2”, “SP3”, “SP4” will be visible depending on
present in the menu “OPEr”). the maximum number of Set Points selected on par. “nSP” and
The possible modification of these Sets, with the procedure they can be programmed with a value that is between the value
described in par. 2.1, is instead subordinate to what is programmed programmed on par. “SPLL” and the one programmed on par.
in par. “Edit” (contained in the group “ ]PAn “). “SPHL”.
This parameter can be programmed as :
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 Note : in all the following examples the Set point is indicated as 3.4 - ELECTRICAL WIRING DIAGRAM
"SP", however the instrument will act according to the Set point
selected as active.
TLK 94
DIG. IN 1 6a + 12a
+
3 - INFORMATION ON INSTALLATION AND USE DIG. IN 2 5a 11a Out5
4a 10a Out4
3.1 - PERMITTED USE A 3a + NO
9a
The instrument has been projected and C Out3
RS485 B 2a 8a
manufactured as a measuring and control device
+ + NO
to be used according to EN61010-1 for the GND 1a 7a
altitudes operation until 2000 ms .
G
C Out2
6b 12b
The use of the instrument for applications not TA HB
+ + NC
expressly permitted by the above mentioned rule must adopt all the 5b 11b
+12 VDC Out6 G
NO
necessary protective measures. 4b 10b Out1

+
The instrument CANNOT be used in dangerous environments 3b 9b

+
(flammable or explosive) without adequate protection.
The installer must ensure that EMC rules are respected, also after 2b 8b
SUPPLY
the instrument installation, if necessary using proper filters . 1b 7b

+
4..20 0/4..20 0/1..5 V PTC NTC Pt100 TC
Whenever a failure or a malfunction of the device may cause mA mA
(passive) (active) 0/2..10 V
dangerous situations for persons, thing or animals, please OUTPUTS
RELAYS:
remember that the plant has to be equipped with additional devices INPUT Out1: 6A-AC1(3A-AC3)/ 250 VAC
which will guarantee safety. Out2,3,4,5: 4A-AC1(2A-AC3)/ 250 VAC
SSR: 12 VDC/20 mA
ANALOG.: 0/4..20mA - 0/2..10V

3.2 - MECHANICAL MOUNTING

The instrument, in DIN case 48 x 96 mm, is designed for flush-in 4 - FUNCTIONS
panel mounting.
Make a hole 45 x 92 mm and insert the instrument, fixing it with the 4.1 - MEASURING AND VISUALIZATION
provided special brackets. All the parameters referring measurements are contained in the
We recommend that the gasket is mounted in order to obtain the group “]InP”.
front protection degree as declared. Avoid placing the instrument in By using par. “HCFG”, it is possible to select the input signal type
environments with very high humidity levels or dirt that may create
which may come: from a thermocouple (tc), a thermo-resistance or
condensation or introduction of conductive substances into the
a thermistor (rtd), from a transducer with normalised analogue
instrument.
signal in current (I) or tension (UoLt) or also from a signal coming
Ensure adequate ventilation to the instrument and avoid installation
from the communication serial line of the instrument (SEr).
in containers that house devices which may overheat or which may
Once the signal type has been selected, it is necessary to set the
cause the instrument to function at a higher temperature than the
type of input probe on par. “SEnS”, which can be :
one permitted and declared.
- for thermocouples J (J), K (CrAL), S (S), B (b), C (C), E (E), L (L),
Connect the instrument as far away as possible from sources of
N (n), R (r), T (t) or for infrared sensors serie TECNOLOGIC IRS –
electromagnetic disturbances such as motors, power relays, relays,
A range - with linearization J (Ir.J) or K (Ir.CA)
solenoid valves, etc.
- for thermoresistances Pt100 IEC (Pt1) or thermistors PTC
The instrument can be removed from its housing from the front side
KTY81-121 (Ptc) or NTC 103AT-2 (ntc)
: it is recommended that the instrument be disconnected from the
- for normalised signals in current 0..20 mA (0.20) or 4..20 mA
power supply when it is necessary to carry out this operation.
(4.20)
- for normalised signals in tension 0..50 mV (0.50), 0..60 mV (0.60),
3.3 - ELECTRICAL CONNECTION 12..60 mV (12.60), 0..5 V (0.5), 1..5 V (1.5), 0..10 V (0.10) or 2..10
Carry out the electrical wiring by connecting only one wire to each V (2.10).
terminal, according to the following diagram, checking that the We recommend that the instrument be switched on and off
power supply is the same as that indicated on the instrument and whenever these parameters are modified, in order to obtain a
that the load current absorption is no higher than the maximum correct measurement.
electricity current permitted. For the instruments with input for temperature probes (tc, rtd) it is
As the instrument is built-in equipment with permanent connection possible to select the unit of measurement (°C, °F) through par.
inside housing, it is not equipped with either switches or internal “Unit”, and the desired resolution (0=1°; 1=0,1°) through par.
devices to protect against overload of current: the installation will
“dP”.
include an overload protection and a two-phase circuit-breaker,
Instead, with regards to the instruments with normalised analogue
placed as near as possible to the instrument, and located in a
input signals, it is first necessary to program the desired resolution
position that can easily be reached by the user and marked as
instrument disconnecting device which interrupts the power supply on par. “dP” (0=1; 1=0,1; 2=0,01; 3=0,001) and then, on par.
to the equipment. "SSC", the value that the instrument must visualise at the
It is also recommended that the supply of all the electrical circuits beginning of the scale (0/4 mA, 0/12 mV, 0/1 V o 0/2 V) and, on
connected to the instrument must be protect properly, using par. "FSC", the value that the instrument must visualise at the end
devices (ex. fuses) proportionate to the circulating currents. of the scale (20 mA, 50 mV, 60 mV, 5 V or 10 V).
It is strongly recommended that cables with proper insulation, In the case of infrared sensors (TECNOLOGIC IRS-"A" range), by
according to the working voltages and temperatures, be used. programming the sensor as "Ir.J" or "Ir.CA", the par. "rEFL" is also
Furthermore, the input cable of the probe has to be kept separate present and it allows the correction of possible measuring errors
from line voltage wiring. If the input cable of the probe is screened, caused by the environment lighting and by the reflectivity of the
it has to be connected to the ground with only one side. material. This parameter should be programmed with a high value
We recommend that a check should be made that the parameters if the material to be measured is particularly bright / reflective and
are those desired and that the application functions correctly before must be reduced if the surface is particularly dark / not reflective,
connecting the outputs to the actuators so as to avoid keeping in mind however that for most materials, the recommended
malfunctioning that may cause irregularities in the plant that could value is within 1.00 and 0.80.
cause damage to people, things or animals. The instrument allows for measuring calibration, which may be
used to recalibrate the instrument according to application needs,
by using par. “OFSt” and “rot”.

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 Programming par. “rot”=1,000, in par. “OFSt” it is possible to set a 4”). The option "On" it results usable for the output OUT6 (standard
positive or negative offset that is simply added to the value read by on all the models) to have an auxiliary supply output for input
the probe before visualisation, which remains constant for all the sensors
measurements. - ANALOGICAL OUTPUTS 0/4..20 mA or 0/2..10 V (only
If instead, it is desired that the offset set should not be constant for OUT1,2):
all the measurements, it is possible to operate the calibration on With the parameter “Aorn” it is possible to set the beginning of the
any two points. scale used for the output.
In this case, in order to decide which values to program on par. This parameter will therefore be set at:
“OFSt” and “rot”, the following formulae must be applied : = 0 : if one intends to use the beginning of the scale as equal to 0
“rot” = (D2-D1) / (M2-M1) “OFSt” = D2 - (“rot” x M2) (0 mA if the output is 0/4...20 mA, or 0 V if the output is 0/2...10 V)
where: = no_0 : if one intends to use the beginning of the scale other than
M1 =measured value 1 0 (4 mA if the output is 0/4...20 mA, or 2 V if the output is 0/2...10
D1 = visualisation value when the instrument measures M1 V)
M2 =measured value 2 The parameter “AonF” will be present by which it is possible to
D2 = visualisation value when the instrument measures M2 configure the function of the analogical output as:
It then follows that the instrument will visualise : = 1.rEG : Primary control output
DV = MV x “rot” + “OFSt” = 2.rEG : Secondary control output
where: DV = visualised value MV= measured value = r.inP : measurement retransmission output
Example 1: It is desired that the instrument visualises the value = r.Err : error retransmission output [SP-PV]
effectively measured at 20° but that, at 200°, it visualises a value = r.SP : Active Set Point retransmission output
lower than 10° (190°). = r.SEr : output led by serial communication line of the instrument
Therefore : M1=20 ; D1=20 ; M2=200 ; D2=190 = OFF : deactivated output
“rot” = (190 - 20) / (200 - 20) = 0,944 In the case that analogical output is configured as 1.rEG or 2.rEG
“OFSt” = 190 - (0,944 x 200) = 1,2 the output signal will be proportional to the control power
Example 2: It is desired that the instrument visualises 10° whilst the calculated by the instrument starting from 0% (output signal
value actually measured is 0°, but, at 500° it visualises a 50° higher corresponding to the set beginning of the scale) up to 100% (output
value (550°). signal corresponds to the maximum that can be supplied by the
Therefore : M1=0 ; D1=10 ; M2=500 ; D2=550 type of output available).
“rot” = (550 - 10) / (500 - 0) = 1,08 The analogical control outputs can only be used for PID single
“OFSt” = 550 - (1,08 x 500) = 10 action or dual action controls.
By using par. “FiL” it is possible to program time constant of the If the set control mode was the ON/OFF type, the analogical output
software filter for the input value measured, in order to reduce could only take on the control states 0 % or 100 %.
noise sensitivity (increasing the time of reading). In the case that the analogical output function should be configured
In case of measurement error, the instrument supplies the power for the retransmission of the signal, it is therefore necessary to
as programmed on par. “OPE”. programme another two parameters which set the minimum and
This power will be calculated according to cycle time programmed maximum reference values.
for the PID controller, while for the ON/OFF controllers the cycle Therefore, in these cases, set the parameter "AonL" with the value
time is automatically considered to be equal to 20 sec. (e.g. In the that the instrument must provide the minimum value (0/4 mA or 0/2
event of probe error with ON/OFF control and “OPE”=50, the V) in output and the value to which the instrument must provide the
control output will be activated for 10 sec., then it will be maximum value (20 mA o 10 V) to the parameter "AonH" in output.
deactivated for 10 sec. and so on until the measurement error
remains.). 4.3 - ON/OFF CONTROL (1.rEG)
By using par. “InE” it is also possible to decide the conditions of All the parameters referring to the ON/OFF control are contained in
the input error, allowing the instrument to give the power the group “]rEG”.
programmed on par. “OPE” as output. This type of control can be obtained by programming par."Cont" =
The possibilities of par. “InE” are : On.FS or = On.FA and works on the output programmed as 1.rEG,
= Or : the condition occurs in case of over-range or probe breakage depending on the measure, on the active Set Point “SP”, on the
= Ur : the condition occurs in case of under-range or probe functioning mode "Func” and on the hysteresis "HSEt".
breakage The instrument carries out an ON/OFF control with symmetric
= OUr : the condition occurs in case of over-range or under-range hysteresis if “Cont" = On.FS or with asymmetrical hysteresis if
or probe breakage “Cont” = On.FA.
Using par. “diSP”, located in the group “]PAn”, it is possible to set PV PV
normal visualization of the SV display which can be the active Set SP
Point (SP.F), the control power (Pou), the Set Point operating when H S Et
H SE t
there are active ramps (SP.o) or alarm threshold AL1, 2, 3, 4 . SP

tim e tim e

ON ON ON ON ON ON
4.2 - OUTPUT CONFIGURATION O UT OUT
The instrument’s outputs can be programmed by entering the 1 .rE G o ff off 1.rEG off o ff

group of parameters “]Out” where different parameters (depending H EAt - O n.F A C oo L - O n .F A

on the type of outputs - digital or analogue - available on the PV
PV
H S Et
instrument) are located. SP H SE t
H S Et SP
Note: In the following examples, the number of outputs is H SE t

generically indicated with n tim e tim e

- DIGITAL OUTPUTS relay or SSR type : ON ON ON ON ON ON
O UT OUT
The par. “OnF” can be set for the following functions : 1 .rE G o ff off 1.rEG off o ff
= 1.rEG : Main control output
H EAt - O n.F S C oo L - O n .FS
= 2.rEG : Secondary control output
= ALno : Alarm output normally open The control works in the following way : in the case of reverse
= ALnc : Alarm output normally closed action, or heating (“FunC”=HEAt), it deactivates the output, when
= On : Output always activated the process value reaches [SP + HSEt] in case of symmetrical
= OFF : Output deactivated hysteresis, or [SP] in case of asymmetrical hysteresis and is then
The coupling outputs number outputs – number alarms can be activated again when the process value goes below value [SP -
made in the group referring to the alarm to the alarm (“]AL1, 2, 3, HSEt]. Vice versa, in case of direct action or cooling
("Func”=CooL), it deactivates the output, when the process value
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 reaches [SP - HSEt] in case of symmetrical hysteresis, or [SP] in "tcr1" - Cycle time of the output 1rEG (digital output only)
case of asymmetrical hysteresis and is activated again when the "Int" - Integral Time
process value goes above value [SP + HSEt]. "rS" - Manual Reset (if “Int =0 only)
"dEr" - Derivative Time
4.4 - NEUTRAL ZONE ON/OFF CONTROL (1.rEG - 2.rEG) “FuOC” - Fuzzy Overshoot Control
All the parameters referring to Neutral Zone ON/OFF control are This last parameter allows the variable overshoots at the start up of
contained in the group “]rEG”. the process or at the changing of the Set Point to be avoided.
This type of control can be obtained when 2 outputs are Please remember that a low value on this parameter reduces the
programmed respectively as 1.rEG and 2.rEG and the par. “Cont” overshoot while a high value increase it.
= nr .
The Neutral Zone control is used to control plants in which there is P V
an element which causes a positive increase (ex. Heater, S P 2
humidifier, etc.) and an element which causes a negative increase 1
(ex. Cooler, de-humidifier, etc).
The control functions works on the programmed outputs depending 3
on the measurement, on the active Set Point “SP” and on the
hysteresis "HSEt".
The control works in the following way : it deactivates the outputs
when the process value reaches the Set Point and it activates the
output 1rEG when the process value goes below value [SP - HSEt], t im e
or it activates the output 2.rEG when the process value goes above 1: “FuOC” OK
[SP + HSEt]. 2: “FuOC” too high
Consequently, the element causing a positive increase has to be 3: “FuOC” too low
connected to the output programmed as 1.rEG while the element
causing a negative increase has to be connected to the output 4.6 - DOUBLE ACTION PID CONTROLLER (1.rEG - 2.rEG)
programmed as 2.rEG. All the parameters referred to PID control are contained into the
PV group “]rEG”.
The Double Action PID control is used to control plants where there
HSEt is an element which causes a positive increment (ex. Heating) and
SP
HSEt an element which causes a negative increment (ex. Cooling).
This type of control is obtainable when 2 outputs are programmed
respectively as 1.rEG and 2.rEG and the par. “Cont” = Pid.
The element causing a positive increase has to be connected to
time
0N 0N the output programmed as 1.rEG while the element causing a
OUT 1.rEG
(heating) off off negative increase has to be connected to the output programmed
0N as 2.rEG.
OUT 2.rEG The Double Action PID control works on the outputs 1.rEG and
(cooling) off off
2.rEG depending on the active Set Point “SP” and on the
instrument’s PID algorithm with two degree of freedom.
4.5 -SINGLE ACTION PID CONTROL (1.rEG) In order to obtain a good stability of the process variable, in case of
All the parameters referring to PID control are contained in the fast processes and with control by digital outputs, the cycle times
group “]rEG”. “tcr1” and “tcr2” have to have a low value with a very frequent
The Single Action PID control can be obtained by programming intervention of the control outputs.
par."Cont" = Pid and works on the output 1.rEG depending on the In this case it’s recommended to use solid state relays (SSR) to
active Set Point “SP”, on the functioning mode "Func” and on the drive the actuators.
instrument’s PID algorithm with two degree of freedom. The Double Action PID control algorithm needs the programming of
the following parameters :
PV
"Pb" - Proportional Band
SP "tcr1" - Cycle time of the output 1rEG
“tcr 2” - Cycle time of the output 2rEG
"Int" - Integral Time
"rS" - Manual Reset (if “Int =0 only)
"dEr" - Derivative Time
tim e “FuOC” - Fuzzy Overshoot Control
1 .rE G 0N 0N 0N 0N 0N 0N 0N "Prat" - Power Ratio or relation between power of the element
D IG . o ff o ff o ff o ff o ff o ff controlled by output 2.rEG and power of the element controlled by
(H E A t)
output 1.rEG.
tcr1 tc r 1 tc r 1 tc r 1 tc r 1 tcr1 tc r 1
100% 4.7 - PID CONTROL FOR MOTORIZED ACTUATORS WITH TIME
1 .rE G POSITIONING (1.rEG - 2.rEG)
AN ALO G . All the parameters concerning the PID control for motorised
(H E A t) actuators are contained in the group “]rEG”.
0%
This type of control is used to control installations that have a
motorised actuator with digital opening and closing controls that
In order to obtain good stability of the process variable, in the event remain at the point they have reached if no command is received
of fast processes and with control by digital output, the cycle time and which are started up when 2 outputs are configured as 1.rEG
“tcr1” has to have a low value with a very frequent intervention of and 2.rEG respectively and the parameter “Cont” = 3 Pt is set.
the control output. The opening command for actuation will be supplied by the output
In this case use of a solid state relay (SSR) is recommended for configured as 1.rEG while the closing command will be supplied by
driving the actuator. the output configured as 2.rEG.
The Single Action PID control algorithm foresees the setting of the The PID type control for motorised actuators therefore acts on the
following parameters : outputs 1.rEG and 2.rEG depending on the active Set point “SP”
"Pb" - Proportional Band

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 and the result of the PID control algorithm with two degrees of 1) Program and activate the desired Set Point.
liberty for the instrument. 2) Program par. "Cont" =Pid or =3 Pt if the instrument drives a
The control system used does not foresee a retroaction for finding motorized actuator with time positioning.
the current position of the actuator. 3) Program par. "Func" according to the process to be controlled
If the actuator is not fitted with safety stop contacts that interrupt through output 1.rEG.
the actuator at the end of its run it is necessary to equip the 4) Program an output as 2.rEG if the instrument controls a plant
installation with these contacts (SQo, SQc) as shown in the with double action or a motorized actuator with time positioning.
diagram 5) Set the parameter "Auto" as:
= 1 - if FAST autotuning is desired automatically, each time the
TLK 94 instrument is switched on, on the condition that the process value
is lower (with “Func” =HEAt) than [SP- |SP/2|] or higher (with
1 .rE G 2 .rE G “Func” =CooL) than [SP+ |SP/2|].
= 2 - if FAST autotuning is desired automatically, the next time the
instrument is switched on, on the condition that the process value
is lower (with “Func” =HEAt) than [SP- |SP/2|] or higher (with
“Func” =CooL) than [SP+ |SP/2|], and once the tuning is finished,
S u p p ly S Q o S Q c
the par. “Auto” is automatically swapped to the OFF state
= 3 - if manual FAST autotuning is desired, by selecting par. “tunE”
in the main menu or by key “U” correctly programming as “USrb” =
O P E N M C LO S E tunE. The Autotuning will start at the condition that the process
value is lower (with “Func” =HEAt) than [SP- |SP/5|] or higher (with
“Func” =CooL) than [SP+ |SP/5|].
The PID control algorithm for motorised actuators with time = 4 - if it’s desired to activate the FAST autotuning automatically at
positioning foresees the setting of the following parameters: the end of programmed Soft-Start cycle or each time the Set Point
“Pb” - Proportional band is changed. The Autotuning will start at the condition that the
“Int” - Integral time process value is lower (with “Func” =HEAt) than [SP- |SP/5|] or
“rS” - manual reset (only if “Int =0) higher (with “Func” =CooL) than [SP+ |SP/5|].
“dEr” - Derivative time = - 1 - if the OSCILLATING autotuning is to be started automatically
“FuOC” - Fuzzy Overshoot Control each time the instrument is turned on.
“tcor” - time of actuator run. = - 2 - if the OSCILLATING autotuning is to be started
This is the time, expressed in seconds that is needed for the automatically when the instrument is turned on the next time and,
actuator to pass from the “completely open” position to “completely once tuning has been completed, the parameter “Auto"=OFF is set
closed” position. automatically.
“SHrI” - Minimum control value. = - 3 - if OSCILLATING autotuning is started up manually, by
It is the value that the control must have reached (in %) before it selecting par. “tunE” in the main menu or by key “U” correctly
has an effect on the output. It is needed to prevent the control from programming as “USrb” = tunE.
intervening too frequently. = - 4 - if OSCILLATING autotuning is to be started automatically
“PoSI” - Switch on position. each time the Set Point is changed.
This is the position that the actuator must reach when the Note : the Autotuning Fast type is particularly rapid and has no
instrument is switched on. It can have the following values : effect on the control as it calculates the parameters during the Set
nO = the actuator remains where it is, Point reaching phase.
oPEn = the actuator goes to the “completely open” position, In order to correctly perform the Autotuning Fast type it’s necessary
cLoS = the actuator goes to the “completely closed” position. that at the start of the cycle there is a certain difference between
If the options "OPEn" or "CloS" are programmed, when it is turned the process and the Set Point and for this reason the instrument
on the device with activate the output 1.rEG (if "oPEn") or 2.rEG (if activates the Autotuning Fast type only when :
"cLoS") for the time set on parameter "tcor" after which control - For “Auto” = 1 or 2: the process value is lower (with “Func”
begins. =HEAt) than [SP- |SP/2|] or higher (with “Func” =CooL) than [SP+
In the event of an error in measurement, the outputs are activated |SP/2|].
so that the valve moves to the position fixed by the parameter - For “Auto” = 3 or 4 : the process value is lower (with “Func”
“PoSI”. =HEAt) than [SP- |SP/5|] or higher (with “Func” =CooL) than [SP+
|SP/5|].
4.8 - AUTOTUNING AND SELFTUNING FUNCTIONS The Autotuning Fast type is not advisable when the Set Point is
All the parameters referring to the AUTO-TUNING and next to the initial reading or when the measured variable changes
SELF-TUNING functions are contained in the group “]rEG”. irregularly during the tuning cycle (for reasons due to the process
The AUTO-TUNING and SELF-TUNING functions permit the the variable goes up or down).
automatic tuning of the PID controller. In this cases we advice the Autotuning oscillatory type that
The AUTO-TUNING function (FAST or OSCILLATING type) activates some ON-OFF control cycles permitting the oscillation of
permits the calculation of the PID parameters by means of a tuning the process value around the Se Point value and afterward the
cycle and, at the end of this operation, the parameters are stored control swap to the PID type with those values calculated by the
into the instrument’s memory and remain constant during control. Autotuning.
The SELF-TUNING function (rule based "TUNE-IN") instead allows 6) Exit from the parameter programming.
control monitoring and the continuous calculation of the parameters 7) Connect the instrument to the controlled plant.
during control. 8) Start up autotuning turning off and on the instrument if “Auto" = 1
All functions automatically calculate the following parameters : or 2, by selecting “tunE” in the main menu (or by correctly
"Pb" - Proportional Band programming key “U” ) if “Auto" = 3, or by varying the Set value if
"tcr1" - Cycle time of the output 1.rEG
“Auto" = 4.
At this point, the Autotuning function is started up and is marked by
"Int" - Integral Time
the turning on of the led TUN.
"dEr" - Derivative Time
The regulator starts up a series of operations on the connected
“FuOC” - Fuzzy Overshoot Control system in order to calculate the most suitable PID regulation
and, for the Double Action PID control, also : parameters.
“tcr 2” - Cycle time of the output 2.rEG If, at the FAST Auto-tuning start, the condition for the lower or
"Prat" - Ratio P 2.rEG/ P 1.rEG higher process value is not found the display will show “ErAt” and
To activate the AUTO-TUNING function proceed as follows :

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 the instrument will be swapped to normal control conditions The limitation function is deactivated by setting the parameters =
according to the previously programmed parameters. InF and if “OPLO” is not active in manual control mode.
To make the error “ErAt” disappear, press key P.
The autotuning cycle is limited to a maximum of 12 hours. 4.11 - SPLIT RANGE FUNCTION
If the process has not ended in 12 hours the instrument will show The use of this function is only possible if the PID control is dual
"noAt" . function and can be used to delay or bring forward the intervention
Instead, if a probe error should occur, the instrument will interrupt of the actuators commanded by the instrument.
the cycle being carried out. Using this function it is therefore possible to optimise the
The values calculated by Autotuning will be memorized intervention of the two actuators in such a way that their actions do
automatically by the instrument at the end of the correct completion not overlap or so that they overlap so that they obtain the mix of the
of the autotuning cycle in the parameters related to PID regulation. two actions of the actuators.
Note : The instrument is already programmed in our factory to Basically, this means setting two power offsets (one for direct
carry out auto-tuning at every instrument switch on ("Auto" = 1). action and one for reverse action) that set the beginning of the
To activate the SELF-TUNING function proceed as follows intervention of the actuator commanded by the output.
1) Program and activate the desired Set Point. The parameters that can be set for this function contained in the
2) Program par. "Cont" =Pid. block “]rEG”, are:
3) Program par. "Func" according to the process to be controlled “thr1” : Power threshold at which output 1.rEG begins to operate.
through output 1.rEG. “thr2” : Power threshold at which output 2.rEG begins to operate.
4) Program an output as 2.rEG if the instrument controls a Basically, if one wishes to bring forward the reverse action (1.rEG)
dual-action plant and delay the direct action (2.rEG) it is necessary to set positive
5) Program par. "SELF" = yES values on parameter “thr1” and negative values on parameter
6) Exit from the parameter programming. “thr2”.
7) Connect the instrument to the controlled plant. In this way, the area within which the two outputs are not activated
8) Activate Self-tuning selecting par. “tunE” in the main menu (or at the same time is increased.
by correctly programming key “U”). PV
When the Self-tuning function is active, the led TUN is permanently
lit up and all the PID parameters ("Pb", "Int", "dEr", etc.) are no Pb
longer visualized. SP
Pb

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 100%
time
with the Self-tuning function activated, these functions will remain 1rEG thr1
(Heating)
activated the next time it is switched on. 0%
2rEG thr2
4.9 - CONTROL POWER LIMITATION (Cooling)
-100%
Using this function, it is possible to limit the output control power Vice versa if one wishes to extend the reverse action (1.rEG) and
(separately for both control outputs) within a minimum limit and a bring forward the direct action (2.rEG) it is necessary to set nega-
maximum limit . tive values on parameter “thr1” and positive values on parameter
It is only possible to use these limits if the PID control is single or “thr2”.
dual action and it may be useful to overcome some mechanical In this way, the area within which the two outputs are activated at
problems of the actuators such as valves that do not open until the the same time is increased.
output has reached at least 20% and/or are already completely
closed when the power has reached 80%. PV

The PID control of the instrument normally works producing power

between 0 and 100 % in the case of single-action PID and –100 Pb
SP
(C) and 100 (H) % in the case of dual-action PID. Pb
The function is therefore deactivated by setting “ro1.L” =0 “ro2.L” =
0 and “ro1.H” =100, “ro2.H” = 100.
By setting different values the power is lowered to within the limits time
100%
set in order to use the actuator’s dynamics to the maximum. 1rEG thr2
The parameters that can be set for this function, contained in the (Heating)
0%
“]rEG” block are: 2rEG thr1
“ro1.L” - minimum power in output from 1.rEG (H) (Cooling)
-100%
“ro1.H” - maximum power in output from 1.rEG (H)
“ro2.L” - minimum power in output from 2.rEG (C) The split range function is deactivated by setting the respective
“ro2.H” - maximum power in output from 2.rEG (C) parameters =0.
The limitation is not active under the “OPLO” manual control mode. PV

4.10 - LIMITATION OF THE CONTROL POWER VARIATION Pb

SPEED SP
Pb
This function makes it possible to limit the variation speed of the
control power in output (separately for both control outputs).
It is only possible to use this function if the PID control is single or
time
dual action and can be useful for overcoming some problems with 100%
the actuators that may need a slow progressive variation in power. 1rEG
(Heating)
The parameters that can be set for this function, contained in the 0%
]
block “ rEG”, are: 2rEG
(Cooling)
“OPS1” - variation speed of the output power from 1.rEG (H) -100%
expressed in [% / sec].
Note : In order to simplify the explanation of the example graphs a
“OPS2” - variation speed of the output power from 2.rEG (C)
dual action control that is only proportional (and therefore with “dEr”
expressed in [% / sec].
and “Int” = OFF) with “Prat” = 1.0 and “rS” = 0.0 was considered.

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 4.12 - REACHING OF THE SET POINT AT CONTROLLED “SSt” - Soft-Start time (expressed in hh.mm)
SPEED AND AUTOMATIC SWITCHING BETWEEN TWO SET “HSEt” - End Soft Start cycle threshold
POINTS (RAMPS AND DWELL TIME) If both parameters are programmed with values other than OFF,
All the parameters referring to the ramps functioning are contained when switched on the instrument gives an output power as
in the group “]rEG”. programmed on par. “St.P” for the time programmed on par. “SSt”
It is possible to reach the set point in a predetermined time (in any or when is reached the absolute value programmed at par. “HSEt”.
case longer than the time the plant would naturally need). This Practically, the instrument works in manual condition and switches
could be useful in those processes (heating or chemical to automatic control at the elapsing of time “SSt” or when is
treatments, etc.) where the set point has to be reached gradually, reached the absolute value programmed at par. “HSEt”.
in a predetermined time. To disable the Soft-Start function simply program par. “SSt” = OFF.
Once the instrument has reached the first Set Point (SP1) it is pos- Whenever, a measurement errors occurs during the Soft-Start
sible to have automatic switching to the second Set Point (SP2) af- execution, the function is interrupted and the instrument gives an
ter a set time, thus obtaining a simple automatic process cycle. output power as programmed on par. “OPE”.
These functions are available for all the programmable controls If the measurement is restored, the Soft-Start is still deactivated.
(PID single and double action, ON/OFF and Neutral Zone If it’s desired to activate the Autotuning with Soft-Start set par.
ON/OFF). “Auto”=4 / -4
The function is determined by the following parameters : The Autotuning will start automatically at the end of programmed
"SLor" - Gradient of first ramp expressed in unit/minute Soft-Start cycle (see. par. 4.8).
"SLoF" - Gradient of second ramp expressed in unit/minute.
"dur.t" - Dwell time of Set Point “SP1” before automatic switching 4.14 - ALARMS OUTPUTS FUNCTIONS (AL1, AL2, AL3, AL4)
to Set Point “SP2” (expressed in hrs. and min.). The alarms depend on the process value (AL1, AL2, AL3, AL4) and
The functions are deactivated when the relative parameters are = before setting them to work, it is necessary to know which output
InF. the alarm has to correspond to.
If is desired only one ramp (ex. to reach “SP1”) it is enough to First of all it is necessary to configure in the groups of parameters
program on the par. "SLor" the desired value. “]Out ”, the parameters relative to the outputs required as alarm
The ramp "SLor" it will always active at power on and when the (“O1F”, “O2F”, “O3F”, “O4F”, “O5F”, “O6F”) programming the
Active Set Point value is changed. parameter relating to the desired output as follows :
= ALno if the alarm output has to be ON when the alarm is active,
SV
[U n it ]
while it is OFF when the alarm is not active
= ALnc if the alarm output has to be ON when the alarm is not
SP1 SLor active, while it is OFF when the alarm is active
SLor SP1
Note: In all the examples that follow is made reference to the alarm
AL1. Naturally the operation of the other alarms results analogous.
Have now access at the group “]AL1”, and program on par.
“OAL1” , to which output the alarm signal has to be sent.
change
S P 1 V a lu e
t im e [m in .] The alarm functioning is instead defined by parameters :
"AL1t " - ALARM TYPE
If it is desired an automatic cycle from the power on instead it is "Ab1" - ALARM CONFIGURATION
necessary to program the par. "nSP" = 2, to program the two Set “AL1” - ALARM THRESHOLD
Point values "SP1" and "SP2" and naturally to program the par.
“AL1L” - LOW ALARM THRESHOLD (for band alarm) OR
"SLor", "dur.t" and "SLoF" with the desired values.
MINIMUM SET OF AL1 ALARM THRESHOLD (for low or high
In this case at the end of the cycle all the ramps won't be more
alarm)
active.
“AL1H” - HIGH ALARM THRESHOLD (for band alarm) OR
SV MAXIMUM SET OF AL1 ALARM THRESHOLD (for low or high
[ U n it]
d u r .t alarm)
SP1
SLoF “HAL1” - ALARM HYSTERESIS
SLor “AL1d” - ALARM ACTIVATION DELAY (in sec.)
SP2
"AL1i" - ALARM BEHAVIOUR IN THE EVENT OF
MEASUREMENT ERROR
AUTO tim e [m in .]
"AL1t" - ALARM TYPE : the alarm output can behave in six
ch an ge
Set different ways.
Examples with starts from values lower than SP and with LoAb = ABSOLUTE LOW ALARM: The alarm is activated when
decreasing of SP. the process value goes below the alarm threshold set on parameter
Note: In case of PID control, if Auto-tuning is desired whilst the "AL1” and will be deactivated when it goes above the value
ramp function is active, this will not be carried out until the tuning [AL1+HAL1].
cycle has been completed. It is therefore recommended that With this mode is possible to program the minimum and the
Auto-tuning be started avoiding activating the ramp function and, maximum set of “AL1” by “AL1L” and “AL1H” parameters.
once the tuning is finished, deactivate Auto-tuning (“Auto” = OFF), HiAb = ABSOLUTE HIGH ALARM: The alarm is activated when the
program the desired ramp and, if it automatic tuning is desired, process value goes higher than the alarm threshold set on
enable the Self-tuning function. parameter "AL1" and will be deactivated when it goes below the
value [AL1 - HAL1].
With this mode is possible to program the minimum and the
4.13 - SOFT-START FUNCTION
maximum set of “AL1” by “AL1L” and “AL1H” parameters.
All the parameters referring to the Soft -Start functioning are
PV PV
contained in the group “]rEG”.
The Soft-Start function only works through PID control and allows AL1
the limitation of control power when the instrument is switched on, HAL1
HAL1

for a programmable period of time. AL1

This is useful when the actuator, driven by the instrument, may be
damaged excess power supplied when the application is not yet in ON ON ON ON
time time
the normal rating. (ex. for certain heating elements). OUT OUT
The function depends on the following parameters : AL1 off off off AL1 off off off
“St.P” - Soft-Start power LoAb HiAb

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 LodE = DEVIATION LOW ALARM: The alarm is activated when sec.) and the alarm will be activated only after the elapsing of that
the process value goes below the value [SP1 + AL1] and will be time.
deactivated when it goes above the value [SP1 + AL1 + HAL1]. ALARM LATCH: : the alarm output may behave in two different
With this mode is possible to program the minimum and the ways depending on the value added to par. “Ab1”.
maximum set of “AL1” by “AL1L” and “AL1H” parameters. + 0 = ALARM NOT LATCHED: The alarm remains active in alarm
HidE = DEVIATION HIGH ALARM: The alarm is activated when the conditions only.
process value goes above the value [SP1 + AL1] and will be + 4 = ALARM LATCHED: The alarm is active in alarm conditions
deactivated when it goes below the value [SP1 + AL1 - HAL1]. and remains active even when these conditions no longer exist,
With this mode is possible to program the minimum and the until the correctly programmed key “U”, (“USrb”=Aac) has been
maximum set of “AL1” by “AL1L” and “AL1H” parameters. pushed.
P V
PV PV

SP
HAL1 A L1
AL1
-AL1
HAL1 SP tim e
O N

+0 o ff o ff
ON ON ON ON
OUT time OUT time
A b1 O N
AL1 off off off AL1 off off off +4 o ff

LodE HidE exemple with absolute high alarm

LHAb = ABSOLUTE BAND ALARM: The alarm is activated when
the process value goes under the alarm threshold set on parameter ALARM AKNOWLEDGEMENT: : the alarm output may behave in
"AL1L" or goes higher than the alarm threshold set on parameter two different ways depending on the value added to par. “Ab1”.
"AL1H" and will be deactivated when it goes below the value [AL1H + 0 = ALARM NOT AKNOWLEDGED: The alarm always remains
- HAL1] or when it goes above the value [AL1L + HAL1]. active in alarm conditions.
LHdE = DEVIATION BAND ALARM: The alarm is activated when + 8 = ALARM AKNOWLEDGED: The alarm is active in alarm
the process value goes below the value [SP1 + AL1L] or goes conditions and can be deactivated by key “U” if properly
above than the value [SP1 + AL1H] and will be deactivated when it programmed (“USrb”=ASi), and also if alarm conditions still exist.
goes below the value [SP1 + AL1H - HAL1] or when it goes above ALARM BEHAVIOUR AT SET POINT CHANGE (DEVIATION
the value [SP1 + AL1L + HAL1]. ALARMS ONLY): the alarm output may behave in two different
PV PV ways, depending on the value added to par. “Ab1”.
AL1H
HAL1 HAL1
+0 = NORMAL BEHAVIOUR: The alarm is always activated when
AL1H there are alarm conditions.
SP
HAL1 AL1L HAL1
+16 = ALARM NOT ACTIVATED AT SET POINT CHANGE: If,
AL1L when Set Point change, the instrument is in alarm condition, the
alarm is not activated. It will be activated only when the process
value is in non-alarm conditions and then back in alarm conditions.
ON ON time ON ON time
OUT OUT "AL1i" - ALARM ACTIVATION IN CASE OF MEASUREMENT
AL1 off off off AL1 off off off ERROR: This allows one to establish how the alarm have behave
in the event of a measurement error (yES=alarm active; no=alarm
LHAb LHdE deactivated).
"Ab1" - ALARM CONFIGURATION: This parameter can assume a
value between 0 and 31. 4.15 - HEATER BREAK ALARM FUNCTION (HB)
The number to be set, which will correspond to the function All the parameters referring to the Heater Break alarm function are
desired, is obtained by adding the values reported in the following contained in the group “]Hb”.
descriptions : The Heater Break alarm function (Breakage of the heating element)
ALARM BEHAVIOUR AT SWITCH ON: the alarm output may is only available when the instrument is equipped with the input
behave in two different ways, depending on the value added to par. (TAHB) to measure the current and if use a digital output to control
“Ab1”. the load.
+0 = NORMAL BEHAVIOUR: The alarm is always activated when This input accepts signals coming from current transformers (TA)
there are alarm conditions. with max. output 50 mA.
+1 = ALARM NOT ACTIVATED AT SWITCH ON: If, when switched The first operation to be carried out in order to obtain a correct
on, the instrument is in alarm condition, the alarm is not activated. current measurement, is to set the current that the instrument has
It will be activated only when the process value is in non-alarm to measure at the end of scale of the input TA (50 mA) on par.
conditions and then back in alarm conditions. “IFS”.
P V
TLK 94

A L1
5b 6b o u t 1 .rE G

tim e
O N O N
+ 0 o ff o ff
KM
A b1 O N
+ 1 o ff o ff EH TA AC
P ow er
exemple with absolute low alarm S u p p ly

ALARM DELAY: the alarm output may behave in two different Load
ways depending on the value added to par. “Ab1”. It is necessary to establish to which output the alarm has to
+0 = ALARM NOT DELAYED: The alarm is immediately activated correspond.
when the alarm condition occurs. To do this it is necessary to set the parameter relative to the output
+2 = ALARM DELAYED: When the alarm condition occurs, delay to be used (“O1F”, “O2F”, “O3F”, “O4F”, “O5F”, “O6F”) in the
counting begins, as programmed on par. “AL1d” (expressed in groups “]Out”, programming the parameter as :

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 = ALno if the alarm output has to be active when the alarm is To restore normal functioning after the alarm, select the control
active while it is deactivated when the alarm is not active. mode “OFF” and then re-program the automatic control (“rEG”)
= ALnc if the alarm output has to be active when the alarm is not after checking the correct functioning of probe and drive.
active while it is deactivated when the alarm is active. To exclude the Loop Break alarm, set “OLbA” = OFF.
Enter group “]Hb” and program which output the alarm signal has
to address on parameter “OHb. 4.17 - FUNCTIONING OF KEY “U”
The functioning mode of the alarm is instead defined on par. The function of key “U” can be set through par. “USrb” contained
“HbF” which can be set in the following way : in the group ““]PAn”.
= 1 : The alarm is active when, with output 1rEG active, the current The parameter can be programmed as :
measured by the input TAHB is lower than the value programmed = noF : no function
on par. "IHbL" . = tunE : Pushing the key for 1 sec. at least, it is possible to
= 2 : The alarm is active when, with output 1rEG not active, the cur- activate/deactivate Auto-tuning or Self-tuning
rent measured by the input TAHB is higher than the value pro- = OPLO : Pushing the key for 1 sec. at least, it is possible to swap
grammed on par. "IHbH" . from automatic control (rEG) to manual one (OPLO) and vice
= 3 : The alarm is active when, with output 1rEG active, the current versa.
measured by the input TAHB is lower than the value programmed = Aac : Pushing the key for 1 sec. at least, it is possible to
on par. "IHbL" or with output 1rEG not active, the current meas- acknowledge the alarm. (see par. 4.14)
ured by the input TAHB is higher than the value programmed on = ASi : Pushing the key for 1 sec. at least, it is possible to
par. "IHbH". acknowledge an active alarm (see par. 4.14)
= 4 : The alarm is active when the current measured by the input = CHSP : Pushing the key for 1 sec. at least, it is possible to select
TAHB is lower than the value programmed on par. "IHbL" or the one of the 4 pre-programmed Set Points on rotation.
measured current is higher than the value programmed on par. = OFF : Pushing the key for 1 sec. at least, it is possible to swap
"IHbH", independently by the state of the output 1.rEG. from automatic control (rEG) to OFF control (OFF) and vice versa.
On par. “IHbL” the value of the current normally absorbed by the
load when output 1.rEG is active has to be set, while on par. “IHbH” 4.18 - DIGITAL INPUT
the current normally absorbed by the load when output 1.rEG is not The instrument is equipped with 2 digital inputs whose function can
active. be set by the parameter "diF" contained in the group “]InP”.
The programming of these parameters has to be carried out while The parameter can be programmed as:
also considering the fluctuations of the net voltage to avoid = noF : the input does not carry out any function
undesired alarms. = AaC : By closing the contact connected to the digital input, it is
With regards to the hysteresis of the HB alarm, this is automatically possible to reset a memorised alarm (see par. 4.14)
calculated by the instrument as 1% of the programmed thresholds. = ASi: By closing the contact connected to the digital input, it is
During functioning it is possible to visualize the current measured possible to silence an active alarm (see par. 4.14)
by the input TAHB when output 1rEG is activated, by pushing the = HoLd: By closing the contact connected to the digital input the
“DOWN” key and the current measured when output 1.rEG is deac- measurement taken at that moment is blocked (N.B.: not the
tivated, by pushing the “DOWN” and “U” keys at the same time. reading on the display, therefore the indication may stabilise itself
To exclude the Heater Break alarm it is enough to set “OHb” = with a delay that is proportional to the measuring filter). With the
OFF. hold function turned on, the instrument carries out control
Note : The HB current measurement is valid if the output 1rEG is according to the memorised measurement. By opening the contact,
activated (or deactivated) for 264 ms. at least. the instrument starts normal measurement acquisition once more.
This means that, if the cycle time (“tcr1”) is = 1 sec, the HB alarm is = OFF : When the instrument is in “rEG” status, by closing the
able to intervene only when the output power is higher than 26,4%. contact connected to the digital input, the instrument is placed in
OFF status. By reopening the contact, the instrument returns to the
4.16 - LOOP BREAK ALARM FUNCTION automatic control status “rEG”.
All the parameters referring to the Loop Break alarm function are = CHSP : by closing and reopening the contact connected to the
contained in the group “]LbA”. digital input, it is possible to select one of the 4 memorised set
The Loop Break alarm is available on all the instruments, which points in rotation.
intervenes when, for any reason (short-circuit of a thermocouple, = SP1.4 : The following combination of the connected contacts to
thermocouple inversion, load interruption), the loop control is the two digital entries allows the activation of one of the 4
interrupted. memorized set points.
First of all, it is necessary to establish to which output the alarm DIG IN1 DIG IN2 SET POINT
has to correspond. off off SP1
To do this it is necessary to set the parameter relative to the output on off SP2
to be used (“O1F”, “O2F”, “O3F”, “O4F”, “O5F”, “O6F”) in the off on SP3
groups “]Out ”, programming the parameter as : on on SP4
= ALno if the alarm output has to be ON when the alarm is active The function can be activated using “nSP” = 4 , also, when it is acti-
while it is OFF when the alarm is not active. vated, it disables the selection of the active set by the parameter
= ALnc if the alarm output has to be ON when the alarm is not “SPAt” and by the key U.
active while it is OFF when the alarm is active. = HE.Co : by closing the contact connected to the digital input it is
Enter group “]LbA” and program which output the alarm signal possible to select as active the set point SP2 in “CooL” mode. Reo-
has to be addressed to on par. “OLbA” . pening the contact is select as active the set point SP1 in “HEAt”
The Loop Break alarm is activated if the output power remains at mode. This function is possible only when “nSP” = 2.
the 100% of the value for the time programmed on par. "LbAt"
(expressed in sec.). 4.19 - RS 485 SERIAL INTERFACE
To avoid false alarms, the value of this parameter has to be set The instrument can be equipped with a RS 485 serial
considering the time the plant takes to reach the Set point when communication interface, by means of which it is possible to
the measured value is a long distance from it (for example at the connect the regulator with a net to which other instruments
plant start-up). (regulators of PLC) are connected, all depending typically on a
On alarm intervention, the instrument visualizes the message personal computer used as plant supervisor. Using a personal
“LbA” and behaves as in the case of a measurement error giving a computer it is possible to acquire all the function information and to
power output as programmed on par. “OPE” (programmable in program all the instrument’s configuration parameters. The
the group “]InP”) . software protocol adopted for TLK94 is a MODBUS RTU type,

TECNOLOGIC spa - TLK 94 -OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 11

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 widely used in several PLC and supervision programs available on Instrument supplied from the device
the market (protocol manual is available on request).
The interface circuit allows the connection of up to 32 instruments
on the same line.
To maintain the line in rest conditions a 120 Ohm resistance (Rt)
must be connected to the end of the line.
The instrument is equipped with two terminals called A and B which
have to be connected with all the namesake terminals of the net.
For the wiring operation it is advisable to adopt a screened cable
wired as in the drawing.
HOST
(PC/PLC)
shield
A
Rt
B 120 ohm
GND
SUPPLY
ADAPTER
RS485
Interface
A B GND A B GND A B GND AC SUPPLY 12 VDC

3a 2a 1a 3a 2a 1a 3a 2a 1a
P.A.: For the instruments equipped with RS485 serial
communication, it’s indispensable that the parameter “PACS” is
TLK94 n.1 TLK94 n.2 TLK94 n.N programmed = LorE.
If the instrument is equipped with a serial interface, the parameters For additional info, please have a look at the A01 instruction
to be programmed are the following, all present in the parameters manual.
group “]SEr” :
"Add" : Address of the station. Set a different number for each 5 - PROGRAMMABLE PARAMETERS TABLE
station, from 1 to 255.
"baud" : Transmission speed (baud-rate), programmable from Here following are described all the parameters available on the
1200 to 38400 baud. All the stations have to have the same instrument. Some of them could be not present or because they
transmission speed. are depending on the type of instrument or because they are
"PACS" : Programming access. If programmed as "LoCL" this automatically disabled as unnecessary.
means that the instrument is only programmable from the
]
keyboard, if programmed as "LorE" it is programmable both from Group “ SP” (parameters relative to the Set Point)
the keyboards and serial line. Par. Description Range Def. Note
If an attempt is made to enter the programming from the keyboard 1 nSP Numero Set point 1÷4 1
whilst a communication through the serial port is in progress the programmabili
instrument will visualise "buSy" to indicate the busy state. 2 SPAt Set point Attivo 1 ÷ nSP 1
3 SP1 Set Point 1 SPLL ÷ SPHL 0
4.20 - PARAMETERS CONFIGURATION BY “ A01” 4 SP2 Set Point 2 SPLL ÷ SPHL 0
The instrument is equipped with a connector that allows the trans- 5 SP3 Set Point 3 SPLL ÷ SPHL 0
fer from and toward the instrument of the functioning parameters 6 SP4 Set Point 4 SPLL ÷ SPHL 0
through the device TECNOLOGIC A01 with 5 poles connector. 7 SPLL Set Point minimo -1999 ÷ SPHL -1999
This device it’s mainly useable for the serial programming of the
8 SPHL Set Point massimo SPLL ÷ 9999 9999
instruments which need to have the same parameters configuration ]
or to keep a copy of the programming of an instrument and allow its Gruppo “ InP” (parametri relativi agli ingressi)
rapid retransmission. To use the device A01 it’s necessary that the Par. Descrizione Range Def. Note
device or instrument are being supplied. 9 HCFG Input type tc / rtd / I / tc
Instrument supplied and device not supplied UoLt / SEr
10 SEnS Probe type: tc : J
J=thermocoupled J J/ CrAL/ S/ b/
CrAL=thermocoupled K E/ L/ n/ r/ t/ C/
S=thermocoupled S Ir.J / Ir.CA
b=thermocoupled B rtd :
E=thermocoupled E Pt1 / Ptc / ntc
SUPPLY
n=thermocoupled N I:
r=thermocoupled R 0.20 / 4.20
t=thermocoupled T UoLt :
C=thermocoupled C 0.50 / 0.60 /
Ir.J=IR Sen. IRS J 12.60 / 0.5 /
Ir.CA=IR Sen. IRS K 1.5 / 0.10 /
Pt1=thermores. Pt100 2.10
0.50= 0..50 mV
0.60= 0..60 mV
12.60= 12..60 mV
Ptc= PTC KTY81-121
ntc= NTC 103-AT2
0.20= 0..20 mA
4.20= 4..20 mA
0.1= 0..1 V
0.5=0..5 V
1.5= 1..5 V
0.10= 0..10 V
2.10= 2..10 V

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 11 rEFL Reflection coefficient 0.10 ÷ 1.00 1.00 29 Ao2F Functioning of output 2 1.rEG / 2.rEG OFF
for IRS sensors if analogue type: r.inP / r.Err
12 SSC Low scale limit in case -1999 ÷ FSC 0 see “Ao1F” r.SP / r.SEr
of input with V / I OFF
signals 30 Ao2L Minimum reference for -1999 ÷ Ao2H 0
13 FSC High scale limit in case SSC ÷ 9999 0 analogical output 2 for
of input with V / I signal retransmission
signals 31 Ao2H Maximum reference for Ao2L ÷ 9999 0
14 dP Number of decimal tc/rtd : 0 analogical output 2 for
figures 0/1 signal retransmission
UoLt / I / SEr: 32 O3F Functioning of output 3: 1.rEG / 2.rEG OFF
0÷3 see “O1F” ALno / ALnc
15 Unit Temperature unit of tc/rtd : °C On / OFF
measurement °C / °F 33 O4F Functioning of output 4: 1.rEG / 2.rEG OFF
16 FiL Input digital filter 0FF÷ 20.0 0.2 see “O1F” ALno / ALnc
sec. On / OFF
34 O5F Functioning of output 5: 1.rEG / 2.rEG OFF
17 OFSt Measuring Offset -1999 ÷ 9999 0 see “O1F” ALno / ALnc
18 rot Rotation of the 0.000 ÷ 2.000 1.000 On / OFF
measuring straight line 35 O6F Functioning of output 6: 1.rEG / 2.rEG On
19 InE “OPE” functioning in OUr / Or / Ur OUr see “O1F” ALno / ALnc
case of measuring error On / OFF
OUr = Over and Group “ ] AL1” (parameters relative to alarm AL1)
under-range Par. Description Range Def. Note
Or = Over-range only 36 OAL1 Output where alarm Out1 / Out2 Out2
Ur = Under-range only
AL1 is addressed Out3 / Out4 /
20 OPE Output power in case of -100 ÷ 100 0 Out5 / Out6 /
measuring error % OFF
21 diF Digital input s function: noF / AaC / noF 37 AL1t Alarm AL1 type: LoAb / HiAb LoAb
noF = No Function ASi / HoLd / LoAb= Absolute Low LHAb / LodE
Aac= Reset Alarms OFF / CHSP / HiAb= Absolute High HidE / LHdE
latch SP1.4 /HE.Co LHAb= Absolute Band
ASi= Aknowledged LodE= Deviation Low
Alarms HidE= Deviation High
HoLd = Hold Measure LHdE= Deviation Band
OFF= Control OFF
38 Ab1 Alarm AL1 functioning: 0 ÷ 15 0
CHSP = Sel. Set Point +1 = not activated at
SP1.4 = Sel. SP1,2,3,4
power on
HE.Co = Sel. Heat- +2 = delayed
SP1/Cool -SP2
+4 = latch
Group “ ] Out” (parameters relative to the outputs) +8 = aknowledged
Par. Description Range Def. Note 39 AL1 Alarm AL1 threshold AL1L÷ AL1H 0
22 O1F Func. digital output 1 : 1.rEG / 2.rEG 1.rEG 40 AL1L Low threshold band -1999 ÷ AL1H -1999
1.rEG= Control output 1 ALno / ALnc alarm AL1 or Minimum
2.rEG= Control output 2 On / OFF set alarm AL1 for high
ALno= Alarm Out nor- or low alarm
mally opened 41 AL1H High threshold band AL1L ÷ 9999 9999
ALnc= Alarm Out nor- alarm AL1 or Maximum
mally closed set alarm AL1 for high
On = Output on or low alarm
OFF= Output off 42 HAL1 Alarm AL1 hysteresis OFF ÷ 9999 1
23 Aor1 Beginning of output 1 0 / no_0 0
43 AL1d Activation delay of OFF ÷ 9999 OFF
scale if analogical type
alarm AL1 sec.
24 Ao1F Functioning of output 1 1.rEG / 2.rEG 1.rEG
44 AL1i Alarm AL1 activation in no / yES no
if analogue type: r.inP / r.Err
case of measuring error
1.rEG= Control output 1 r.SP / r.SEr
2.rEG= Control output 2 OFF Group “ ] AL2” (parameters relative to alarm AL2)
r.inP= measur. retrans. Par. Description Range Def. Note
r.Err=error [SP-PV] retr. 45 OAL2 Output where alarm Out1 / Out2 OFF
r.SP=Set Point retr. AL2 is addressed Out3 / Out4 /
r.SEr=out by ser. com. Out5 / Out6 /
OFF=no funct. OFF
25 Ao1L Minimum reference for -1999 ÷ Ao1H 0 46 AL2t Alarm AL2 type: LoAb / HiAb LoAb
analogical output 1 for see “AL1t” LHAb / LodE
signal retransmission HidE / LHdE
26 Ao1H Maximum reference for Ao1L ÷ 9999 0 47 Ab2 Alarm AL2 functioning: 0 ÷ 15 0
analogical output 1 for see “Ab1”
signal retransmission 48 AL2 Alarm AL2 threshold AL2L÷ AL2H 0
27 O2F Functioning of output 2 1.rEG / 2.rEG OFF 49 AL2L Low threshold band -1999 ÷ AL2H -1999
if digital type: ALno / ALnc alarm AL2 or Minimum
see “O1F” On / OFF set alarm AL2 for high
28 Aor2 Beginning of output 2 0 / no_0 0 or low alarm
scale if analogical type

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 50 AL2H High threshold band AL2L ÷ 9999 9999 Out5 / Out6 /
alarm AL2 or Maximum OFF
set alarm AL2 for high 75 IFS High scale limit for input 0.0 ÷ 100.0 100.0
or low alarm TA HB
51 HAL2 Alarm AL2 hysteresis OFF ÷ 9999 1 76 HbF HB Alarm function: 1/2/3/4 1
52 AL2d Activation delay of OFF ÷ 9999 OFF 1= Min. 1.rEG on
alarm AL2 sec. 2=Max. 1.rEG off
53 AL2i Alarm AL2 activation in no / yES no 3= Min. 1.rEG on and
case of measuring error Max. 1.rEG off
Group “ ] AL3” (parameters relative to alarm AL3) 4= Max and Min.
Par. Description Range Def. Note 77 IHbL Low alarm HB threshold 0.0 ÷ IFS 0.0
54 OAL3 Output where alarm Out1 / Out2 OFF (with Out 1.rEG ON)
AL3 is addressed Out3 / Out4 / 78 IHbH High alarm HB IHbL ÷ IFS 100.0
Out5 / Out6 / threshold (with Out
OFF 1.rEG OFF)
55 AL3t Alarm AL3 type: LoAb / HiAb LoAb Group “ ] rEG” (parameters relative to control)
see “AL1t” LHAb / LodE Par. Description Range Def. Note
HidE / LHdE 79 Cont Control type: Pid / On.FA Pid
56 Ab3 Alarm AL3 functioning: 0 ÷ 15 0 Pid= PID On.FS / nr
see “Ab1” On.FA= ON/OFF asym. 3 Pt
57 AL3 Alarm AL3 threshold AL3L÷ AL3H 0 On.FS= ON/OFF sym.
58 AL3L Low threshold band -1999 ÷ AL3H -1999 nr= Neutral Zone
alarm AL3 or Minimum 3Pt= PID mot. act.
set alarm AL3 for high 80 Func Functioning mode HEAt / CooL HEAt
or low alarm output 1.rEG
59 AL3H High threshold band AL3L ÷ 9999 9999 81 HSEt Hysteresis of ON/OFF 0 ÷ 9999 1
alarm AL3 or Maximum control (or end Soft
set alarm AL3 for high Start cycle threshold)
or low alarm 82 Auto Autotuning enable -4 / -3 / -2 / -1 1
60 HAL3 Alarm AL3 hysteresis OFF ÷ 9999 1 FAST (positive values), 0/
61 AL3d Activation delay of OFF ÷ 9999 OFF OSCILLATING 1/2/3/4
alarm AL3 sec. (negative values)
62 AL3i Alarm AL3 activation in no / yES no OFF = Not active
case of measuring error 1 = Start each power on
2= Start at first power
Group “ ] AL4” (parameters relative to alarm AL4)
on
Par. Description Range Def. Note 3= Start manually
63 OAL4 Output where alarm Out1 / Out2 OFF 4= Start after Soft Start
AL4 is addressed Out3 / Out4 / or Set change
Out5 / Out6 / 83 SELF Selftuning enable no / yES no
OFF
84 Pb Proportional band 0 ÷ 9999 50
64 AL4t Alarm AL4 type: LoAb / HiAb LoAb
85 Int Integral time OFF ÷ 9999 200
see “AL1t” LHAb / LodE
sec.
HidE / LHdE
86 dEr Derivative time OFF÷ 9999 50
65 Ab4 Alarm AL4 functioning: 0 ÷ 15 0
sec.
see “Ab1”
87 FuOc Fuzzy overshoot control 0.00 ÷ 2.00 0.5
66 AL4 Alarm AL4 threshold AL4L÷ AL4H 0
88 tcr1 Cycle time of output 0.1 ÷ 130.0 20.0
67 AL4L Low threshold band -1999 ÷ AL4H -1999
1.rEG sec.
alarm AL4 or Minimum
set alarm AL4 for high 89 Prat Power ratio 2rEG/1rEG 0.01 ÷ 99.99 1.00
or low alarm 90 tcr2 Cycle time of 2.rEG 0.1 ÷ 130.0 10.0
68 AL4H High threshold band AL4L ÷ 9999 9999 sec.
alarm AL4 or Maximum 91 rS Manual reset -100.0÷100.0 0.0
set alarm AL4 for high %
or low alarm 92 tcor Time for motorised 4 ÷ 1000 sec. 4
69 HAL4 Alarm AL4 hysteresis OFF ÷ 9999 1 actuator run
70 AL4d Activation delay of OFF ÷ 9999 OFF 93 SHrI Minimum value for 0.0 ÷ 10.0 % 0.0
alarm AL4 sec. motorised actuator
71 AL4i Alarm AL4 activation in no / yES no control
case of measuring error 94 PoSI Switch on position for no / no
Group “ ] LbA” (parameters relative to Loop Break Alarm) motorised actuator cLoS / oPEn
Par. Description Range Def. Note 95 SLor Gradient of first ramp : 0.00 ÷ 99.99 InF
72 OLbA Output where alarm Out1 / Out2 OFF InF= Ramp not active / InF
LbA is addressed Out3 / Out4 / unit/min.
Out5 / Out6 / 96 dur.t Duration time between 0.00 ÷ 99.59 InF
OFF two ramps / InF
73 LbAt Time necessary to acti- OFF ÷ 9999 OFF InF= Time not active hrs.-min.
vate alarm LbA sec. 97 SLoF Gradient of second 0.00 ÷ 99.99 InF
Group “ ] Hb” (parameters relative to Heater Break Alarm) ramp: / InF
Par. Description Range Def. Note InF= Ramp not active unit / min.
74 OHb Output where alarm HB Out1 / Out2 OFF 98 ro1.L Minimum power in 0 ÷ ro1.H 0
is addressed Out3 / Out4 / output from 1.rEG %

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 99 ro1.H Maximum power from ro1.L ÷ 100 100 LorE = Yes (Local and
output from 1.rEG % remote progr.)
100 ro2.L Minimum power in 0 ÷ ro2.H 0
output from 2.rEG % 6 - PROBLEMS, MAINTENANCE AND GUARANTEE
101 ro2.H Maximum power from ro2.L ÷ 100 100
output from 2r.EG % 6.1 - ERROR SIGNALLING
102 OPS1 Power variation speed 1 ÷ 50 / InF InF Error Reason Action
in output from 1.rEG % / sec.
---- Probe interrupted Verify the correct
103 OPS2 Power variation speed 1 ÷ 50 / InF InF
uuuu The measured variable connection between probe
in output from 2.rEG % / sec.
is under the probe’s and instrument and then
104 thr1 Split Range Power -100 ÷ 100 % 0 verify the correct
threshold of output limits (under-range)
oooo The measured variable functioning of the probe
1.rEG
105 thr2 Split Range Power -100 ÷ 100 % 0 is over the probe’s
threshold of output limits (over-range)
2.rEG ErAt FAST Autotuning not Push key “P” in order to
106 St.P Soft-Start power -100 ÷ 100 % 0 possible because the make the error message
107 SSt Soft-Start time OFF / OFF process value is too disappear. Once the error
0.1÷7.59 higher or too lower has been found, try to
/ InF repeat the auto-tuning.
hrs.-min. noAt Auto-tuning not Check the functioning of
Group “ ] PAn” (parameters relative to the user interface) finished within 12 probe and actuator and try
Par. Description Range Def. Note hours to repeat the auto-tuning.
108 USrb Functioning of key “U” : noF / tunE / noF LbA Loop control Check the working of
noF = No Function OPLO / Aac / interrupted probe and actuator and
tune= Start Autotuning ASi / CHSP / (Loop break alarm) swap the instrument to
or Selftuning OFF (rEG) control
OPLO= Manual Control ErEP Possible anomaly of Push key “P”
(open loop) the EEPROM memory
Aac= Reset Alarms In error conditions, the instrument provides an output power as
latch programmed on par “OPE” and activates the desired alarms, if the
ASi= Aknowledged relative parameters “ALni” have been programmed = yES.
Alarms
OFF= Control OFF 6.2 - CLEANING
109 diSP Variable visualized on OFF / Pou / SP.F We recommend cleaning of the instrument with a slightly wet cloth
the display SV: SP.F / SP.o / using water and not abrasive cleaners or solvents which may
OFF= Display OFF AL1 / AL2 / damage the instrument.
Pou= Control Power AL3 / AL4
SP.F= Active Set Value 6.3 - GUARANTEE AND REPAIRS
SP.o = Operative Set The instrument is under warranty against manufacturing flaws or
value faulty material, that are found within 12 months from delivery date.
AL1 = AL1 threshold The guarantee is limited to repairs or to the replacement of the
AL2 = AL2 threshold instrument.
AL3 = AL3 threshold The eventual opening of the housing, the violation of the instrument
AL4 = AL4 threshold or the improper use and installation of the product will bring about
110 Edit Fast progr. Active Set SE / AE / SAE the immediate withdrawal of the warranty’s effects.
and alarms: SAE / SAnE In the event of a faulty instrument, either within the period of
SE= Active Set can be warranty, or further to its expiry, please contact our sales
modified while the department to obtain authorisation for sending the instrument to
alarm thresholds can- our company.
not be modified The faulty product must be shipped to TECNOLOGIC with a
AE= Active Set cannot detailed description of the faults found, without any fees or charge
be modified while the for Tecnologic, except in the event of alternative agreements.
alarm thresholds can
be modified 7 - TECHNICAL DATA
SAE= Active Set and
alarm thresholds can
7.1 - ELECTRICAL DATA
be modified
Power supply: 24 VAC/VDC, 100... 240 VAC +/- 10%
SAnE= Active Set and
Frequency AC: 50/60 Hz
alarm thresholds can-
Power consumption: 10 VA approx.
not be modified
Input/s: 1 input for temperature probes: tc J,K,S,B,C,E,L,N, R,T; in-
Group “ ] SEr” (parameters relative to the serial communication) frared sensors TECNOLOGIC IRS J and K range A ; RTD Pt 100
Par. Description Range Def. Note IEC; PTC KTY 81-121 (990 Ω @ 25 °C); NTC 103AT-2 (10KΩ @
111 Add Station address in case 0 … 255 1 25 °C) or mV signals 0...50 mV, 0...60 mV, 12 ...60 mV or
of serial communication normalized signals 0/4...20 mA, 0/1...5 V , 0/2...10 V.
112 baud Transmission speed 1200 / 2400 / 9600 1 input for current transformer (50 mA max.)
(Baud rate) 9600 / 19.2 / 2 digital inputs for free voltage contact
38.4 Impedance normalized signals input: 0/4..20 mA: 51 Ω;
113 PACS Access at the LoCL / LorE LorE mV and V: 1 M Ω
programming through Output/s: Up to 6 digital outputs. OUT1: SPST-NO (6 A-AC1, 3 A-
serial port: AC3 / 250 VAC), OUT2,3,4,5:SPST-NO (4 A-AC1, 2 A-AC3 / 250
LoCL = No (Local only) VAC),or in tension to drive SSR (12 VDC / 20 mA).

TECNOLOGIC spa - TLK 94 -OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 15

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 Up to 2 analogue outputs: 0/4 ..20 mA (Load Max. 300 Ω) or 0/2 PANEL + GASKET

..10 V. MAX. 8 mm
Auxiliary supply output / OUT6: 12 VDC / 20 mA Max. BRACKETS

Electrical life for relay outputs: 100000 operat.

Installation category: II
Measurement category: I
Protection class against electric shock: Class II for Front panel
Insulation: Reinforced insulation between the low voltage section
(supply and relay outputs) and the front panel; Reinforced
insulation between the low voltage section (supply and relay
outputs) and the extra low voltage section (inputs, analogue
outputs, SSR outputs); analogue and SSR outputs optoisolated
respect to the input. 50 V insulation between RS485 and extra low
voltage section.

7.2 - MECHANICAL DATA

Housing: Self-extinguishing plastic, UL 94 V0
Dimensions: 48 x 96 mm DIN, depth 98 mm
Weight: 260 g approx.
Mounting: Flush in panel in 45 x 92 mm hole
Connections: 2 x 1 mm 2 screw terminals block
Degree of front panel protection : IP 54 mounted in panel with 7.4 - FUNCTIONAL FEATURES
gasket Control: ON/OFF, single and double action PID, PID for motorized
Pollution situation: 2 actuators with time positioning
Operating temperature: 0 ... 50 °C Measurement range: according to the used probe (see range table)
Operating humidity: 30 ... 95 RH% without condensation Display resolution: according to the probe used 1/0,1/0,01/0,001
Storage temperature: -10 ... +60 °C Overall accuracy: +/- (0,2 % fs + 1 digit); PTC/NTC: +/- (0,5 % fs +
1 digit)
7.3 - MECHANICAL DIMENSIONS, PANEL CUT-OUT AND Max. cold junction compensation drift (in tc) : 0,04 °C/°C with
MOUNTING [mm] operating temperature 0 ... 50 °C after warm-up of 20 min.
48 10 Sampling rate: 130 ms.
97,5
Serial Interface : RS485 insulated
Communication protocol: MODBUS RTU (JBUS)
Baud rate: Programmable from 1200 ... 38400 baud
Out1 Out2 Out3 Out4 Out5

Display: Display: 4 digit, 1 Red (PV) h 10mm and 1 green (SV), h

PV

TUN
7,5 mm
Compliance: ECC directive EMC 2004/108/CE (EN 61326), ECC
SV
SET
directive LV 2006/95/CE (EN 61010-1).
89,5
96

Out6
7.5 - MEASURING RANGE TABLE
INPUT “dP” = 0 “dP”= 1, 2, 3
tc J -160 ... 1000 °C -160.0 ... 999.9 °C
“HCFG” = tc - 256 ... 1832 °F -199.9 ... 999.9 °F
“SEnS” = J
TLK 94 tc K -100 ... 1370 °C -100.0 ... 999.9 °C
“HCFG” = tc - 148 ... 2498 °F -148.0 ... 999.9 °F
“SEnS” = CrAl
min. 10 mm tc S 0 ... 1760 °C 0.0 ... 999.9 °C
“HCFG” = tc 32 ... 3200 °F 32.0 ... 999.9 °F
“SEnS” = S
tc B 72 ... 1820 °C 72.0 ... 999.9 °C
45
“HCFG” = tc 162 ... 3308 °F 162.0 ... 999.9 °F
“SEnS” = b
tc E -150 ... 750 °C -150.0 ... 750.0 °C
“HCFG” = tc -252 ... 1382 °F -199.9 ... 999.9 °F
92

“SEnS” = E
tc L -150 ... 900 °C -150.0 ... 900.0 °C
“HCFG” = tc -252 ... 1652 °F -199.9 ... 999.9 °F
“SEnS” = L
tc N -250 ... 1300 °C -199.9 ... 999.9 °C
“HCFG” = tc -418 ... 2372 °F -199.9 ... 999.9 °F
“SEnS” = n
min. 20 mm

tc R -50 ... 1760 °C -50.0 ... 999.9 °C

“HCFG” = tc -58 ... 3200 °F -58.0 ... 999.9 °F
“SEnS” = r
tc T -250 ... 400 °C -199.9 ... 400.0 °C
RECOMMENDED “HCFG” = tc -418 ... 752 °F -199.9 ... 752.0 °F
PANEL CUTOUT “SEnS” = t
tc C 0 ... 2320 °C 0.0 ... 999.9 °C
“HCFG” = tc 32 ... 4208 °F 32.0 ... 999.9 °F
“SEnS” = C
IRS range “A” -46 ... 785 °C -46.0 ... 785.0 °C
“HCFG” = tc -50 ... 1445 °F -50.8 ... 999.9 °F
“SEnS”= Ir.J - Ir.CA

TECNOLOGIC spa - TLK 94 -OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 16

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 Pt100 (IEC) -200 ... 850 °C -199.9 ... 850.0 °C - = (No OUT4)
“HCFG” = rtd -328 ... 1562 °F -199.9 ... 999.9 °F
“SEnS” = Pt1 f : OUTPUT OUT5
PTC (KTY81-121) -55 ... 150 °C -55.0 ... 150.0 °C R = OUT5 Relay
“HCFG” = rtd -67 ... 302 °F -67.0 ...302.0 °F O = OUT5 VDC for SSR
“SEnS” = Ptc
NTC (103-AT2) -50 ... 110 °C -50.0 ... 110.0 °C - = (No OUT5)
“HCFG” = rtd -58 ... 230 °F -58.0 ... 230.0 °F
“SEnS” = ntc g : COMMUNICATION INTERFACE AND CURRENT
0..20 mA -199.9 ... 999.9 TRANSFORMER INPUT
“HCFG” = I -1999 ... 9999 -19.99 ... 99.99 S = RS 485 Serial interface
“SEnS” = 0.20 H = Current Trasformer input
-1.999 ... 9.999
T =RS 485 Serial interface + Current Trasformer input
4..20 mA -199.9 ... 999.9 - = (No RS485, No TA in)
“HCFG” = I -1999 ... 9999 -19.99 ... 99.99
“SEnS” = 4.20
-1.999 ... 9.999 h, i, j : INTERNAL CODES
0 ... 50 mV -199.9 ... 999.9
“HCFG” = UoLt kk, ll : SPECIAL CODES
-1999 ... 9999 -19.99 ... 99.99
“SEnS” = 0.50
-1.999 ... 9.999
m : SPECIAL VERSION
0 ... 60 mV -199.9 ... 999.9
“HCFG” = UoLt -1999 ... 9999 -19.99 ... 99.99 P.A. : The outputs OUT 4, 5 must be the same type (Relay or VDC
“SEnS” = 0.60 for SSR)
-1.999 ... 9.999
12 ... 60 mV -199.9 ... 999.9
“HCFG” = UoLt
TLK 94 PASSWORD = 381
-1999 ... 9999 -19.99 ... 99.99
“SEnS” = 12.60
-1.999 ... 9.999
0 ... 5 V -199.9 ... 999.9
“HCFG” = UoLt -1999 ... 9999 -19.99 ... 99.99
“SEnS” = 0.5
-1.999 ... 9.999
1 ... 5 V -199.9 ... 999.9
“HCFG” = UoLt -1999 ... 9999 -19.99 ... 99.99
“SEnS” = 1.5
-1.999 ... 9.999
0 ... 10 V -199.9 ... 999.9
“HCFG” = UoLt -1999 ... 9999 -19.99 ... 99.99
“SEnS” = 0.10
-1.999 ... 9.999
2 ... 10 V -199.9 ... 999.9
“HCFG” = UoLt -1999 ... 9999 -19.99 ... 99.99
“SEnS” = 2.10
-1.999 ... 9.999

7.6 - INSTRUMENT ORDERING CODE

TLK94 a b c d e f g h i j kk ll m

a : POWER SUPPLY
L = 24 VAC/VDC
H = 100 ... 240 VAC

b : OUTPUT OUT1
R = OUT1 Relay
O = OUT1 VDC for SSR
I = OUT1 analog. 0/4 ..20 mA
V = OUT1 analog. 0/2 .. 10 V

c : OUTPUT OUT2
R = OUT2 Relay
O = OUT2 VDC for SSR
I = OUT1 analog. 0/4 ..20 mA
V = OUT1 analog. 0/2 .. 10 V
- = (No OUT2)

d : OUTPUT OUT3
R = OUT3 Relay
O = OUT3 VDC for SSR
- = (No OUT3)

e : OUTPUT OUT4
R = OUT4 Relay
O = OUT4 VDC for SSR

TECNOLOGIC spa - TLK 94 -OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 17

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