Tecnologic TLK 94 Operating Instructions Manual

TLK 94

MICROPROCESSOR-BASED

DIGITAL

ELECTRONIC CONTROLLER

OPERATING INSTRUCTIONS

Vr. 01 (ENG) - 01/10

cod.: ISTR-MTLK94ENG1

TECNOLOGIC S.p.A.

VIA INDIPENDENZA 56

27029 VIGEVANO (PV) ITALY

TEL.: [phone]
FAX: [phone]

internet : http:\\www.tecnologic.it

e-mail: [e-mail]

FOREWORD

This manual contains the information
necessary for the product to be installed

correctly and also instructions for its
maintenance and use; we therefore recommend
that the utmost attention is paid to the following

instructions and to save it.
This document is the exclusive property of TECNOLOGIC
S.p.A. which forbids any reproduction and divulgation , even
in part, of the document, unless expressly authorized.
TECNOLOGIC S.p.A. reserves the right to make any formal or
functional changes at any moment and without any notice.
Whenever a failure or a malfunction of the device may cause
dangerous situations for persons, thing or animals, please
remember that the plant has to be equipped with additional
devices which will guarantee safety.
Tecnologic S.p.A. and its legal representatives do not assume
any responsibility for any damage to people, things or animals
deriving from violation, wrong or improper use or in any case
not in compliance with the instrument’s features .

INDEX

INSTRUMENT ORDERING CODE

S

7.6

MEASURING RANGE TABLE7.5

FUNCTIONAL DAT

A

7.4

MECHANICAL DIMENSIONS, PANEL CUT-OUT AND
MOUNTING

7.3

MECHANICAL DATA7.2

ELECTRICAL DAT

A

7.1

TECHNICAL DAT

A

7

GUARANTEE AND REPAIRS6.3

CLEANING6.2

ERROR WARNINGS6.1

PROBLEMS , MAINTENANCE AND GUARANTEE6

PROGRAMMABLE PARAMETERS TABLE5

PARAMETERS CONFIGURATION BY

A

014.20

RS 485 SERIAL INTERFACE4.19

DIGITAL INPUTS4.18

FUNCTION OF KEY “U”4.17

LOOP BREAK ALARM FUNCTION4.16

HEATER BREAK ALARM FUNCTION4.15

A

LARMS OUTPUTS FUNCTION

S

4.14

SOFT-START FUNCTION4.13

REACHING OF SET POINT AT CONTROLLED SPEE

D

A

ND AUTOMATIC COMMUTATION BETWEEN TW

O

SET POINTS

4.12

SPLIT RANGE FUNCTION4.11

LIMITATION OF THE CONTROL POWER VARIATIO

N

SPEED (MAXIMUM RATE OF RISE

)

4.10

CONTROL POWER LIMITATION4.9

AUTO-TUNING AND SELF-TUNING FUNCTIONS4.8

PID CONTROL FOR MOTORIZED ACTUATORS WIT

H

TIME POSITIONING

4.7

DOUBLE ACTION PID CONTROL4.6

SINGLE ACTION PID CONTROL4.5

NEUTRAL ZONE ON/OFF CONTRO

L

4.4

ON/OFF CONTROL4.3

OUTPUT CONFIGURATION4.2

MEASURING AND VISUALIZATION4.1

FUNCTIONS4

ELECTRICAL WIRING DIAGRAM3.4

ELECTRICAL CONNECTIONS3.3

MECHANICAL MOUNTIN

G

3.2

PERMITTED USE3.1

INFORMATION ON INSTALLATION AND USE3

A

CTIVE SET POINT SELECTION2.5

CONTROL STATES2.4

PARAMETER PROGRAMMING LEVEL

S

2.3

SELECTION OF CONTROL STATE AND PARAMETER

S

PROGRAMMING

2.2

FAST PROGRAMMING OF THE SET POINT 2.1

PROGRAMMING2

FRONT PANEL DESCRIPTION1.2

GENERAL DESCRIPTION1.1

INSTRUMENT DESCRIPTION1

1 - INSTRUMENT DESCRIPTION

1.1 - GENERAL DESCRIPTION

TLK 94 is a “single loop” digital microprocessor-based controller,
with ON/OFF, Neutral Zone ON/OFF, PID single action, PID dual
action (direct and reverse) control, PID for motorized actuators with
time positioning control. The instrument is equipped with

AUTO-TUNING function (FAST or OSCILLATING type),
SELF-TUNING function and automatic calculation of the FUZZY
OVERSHOOT CONTROL parameter for PID control. The PID
control has a particular algorithm with TWO DEGREES OF
FREEDOM that optimises the instrument’s features independently

of the event of process disturbances and Set Point variations.
Furthermore, the instrument allows for RS485 serial
communication using MODBUS-RTU communication protocol and
a transmission speed up to 38.400 baud. The process value is
visualized on 4 red displays, the Set value is visualized on 4 green
displays while the outputs status is indicated by 6 leds. The

TECNOLOGIC spa - TLK 94 -OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 1

instrument provides for the storage of 4 Set Points and can have
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.
The input is programmable and accepts temperature probes
(Thermocouples J,K,S,B,C,E,L,N,R,T; Thermo-resistances PT100,
Thermistors PTC and NTC; Infrared sensors mod. TECNOLOGIC
IRS) and normalized analogue signals (0/4..20 mA, 0/1..5 V,
0/2..10 V, 0..50/60 mV, 12..60 mV). The instrument have 2
programmable digital inputs for free voltage contacts and can be
equipped with an input for the current transformer, working as a
Heater Break Alarm function. Other important available functions
are: Loop-Break Alarm function, control power limitation, limitation
of the variation speed of the control power, split-range, reaching of
the Set Point at controlled speed, ramp and dwell function,
Soft-Start function, parameters protection on different levels.

1.2 - FRONT PANEL DESCRIPTION

TLK 94

Out2

PV

SV

SET

TUN

Out1 Out3 Out4 Out5

7

3

2

8

12

9

6

4

1

13

14

5

11

Out6

10

1 - Key P : This is used to access the programming parameters
and to confirm selection.
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
the current measured by the TAHB input, on the SV display.
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
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.

4.17) and modify the visibility of the parameters in “ConF” menu
(see par. 2.3).

5 - Led OUT1 : indicates the state of output OUT1
6 - Led OUT2 : indicates the state of output OUT2
7 - Led OUT3 : indicates the state of output OUT3
8 - Led OUT4 : indicates the state of output OUT4
9 - Led OUT5 : indicates the state of output OUT5
10 - Led OUT6 : indicates the state of output OUT6
11 - Led SET : it indicates access to the programming mode and

the parameters level (see par. 2.3).
12 - Led TUN : indicates that the Self-tuning function is activated
(light on) or that Auto-tuning (flashing ) is in progress.

13 - Display PV: normally indicates the process value
14 - Display SV: normally indicates the active Set value, however it

can be programmed, using par. “diSP”, to visualize other values.

2 - PROGRAMMING

2.1 - FAST PROGRAMMING OF THE SET POINT

This procedure permits rapid programming of the active Set Point
and possibly the alarm thresholds (see par 2.3)
Push key “P”, then release it and the display will visualise “SP n”
(where n is the number of the Set Point active at that moment) and
the programmed value.
To modify the value, press “UP” key to increase it or the “DOWN”
key to decrease it.
These keys change the value one digit at a time but if they are
pressed for more than one second, the value increases or
decreases rapidly and, after two seconds in the same condition,
the changing speed increases in order to allow the desired value to
be reached rapidly.
Once the desired value has been reached, by pushing key P it is
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).
To exit the fast Set programming it is necessary to push key P,
after the visualisation of the last Set Point, or alternatively, if no key
is pressed for approx. 15 seconds, the display will return to normal
functioning automatically.

2.2 - SELECTION OF THE CONTROL STATE AND
PARAMETERS PROGRAMMING

By pushing key "P" and holding it down for approx. 2 sec. it is
possible to enter into the main selection menu.

SELFTUNING

AUTOTUNING

2 sec.

Hold for

"OFF"

"rEG"

"OP LO "

Using the "UP" or DOWN” keys, it is then possible to roll over the
selections:

to swap the regulator to the manual control state and
therefore to program the % control value using the
“UP” and “DOWN” keys

"OPLO"

to activate the Auto-tuning or Self-tuning function

"tunE"

to swap the regulator into the automatic control state

"rEG"

to swap the regulator into the OFF state

"OFF"

to enter into the configuration parameters menu

"ConF"

to enter into the operating parameters menu

"OPEr"

Once the desired item has been selected, push key “P” to confirm.
Selecting "OPEr" and "ConF" gives the possibility of accessing
other menus containing additional parameters and more precisely :
"OPEr" – Operating parameters Menu: this normally contains the
Set Point parameters but it can contain all the desired parameters
(see par. 2.3).

TECNOLOGIC spa - TLK 94 -OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 2

"ConF" – Configuration parameters Menu: this contains all the
operating parameters and the functioning configuration parameters
(alarm configuration, control, input, etc.)
To enter the menu “ConF” select the option “ConF”, press the key
“P” and the display will show “0”.
At this request, enter, using keys “UP” and “DOWN”, the number
reported on the last page of this manual and push key “P”.
If an incorrect password is entered, the instrument exit from
programming mode.
If the password is correct, the display will visualise the code
identifying the first group of parameters (“

]

SP “) and with keys “UP”

and “DOWN” it will be possible to select the desired group of
parameters.
Once the desired group of parameters has been selected, the code
identifying the first parameter of the selected group will be
visualised by pushing the “P” key.
Again using the “UP” and “DOWN” keys, it is possible to select the
desired parameter and, if the key “P” is pressed, the display will
show the parameter’s code and its programming value, which can
be modified by using the “UP” or “DOWN” keys.
Once the desired value has been programmed, push key “P” once
more: the new value will be memorised and the display will show
only the code of the selected parameter.
By using the “UP” or “DOWN” keys, it is then possible to select a
new parameter (if present) and modify it as described above.
To select another group of parameters, keep the “UP” or “DOWN”
key pressed for approx. 2 sec., afterwards the display will return to
visualise the code of the group of parameters.
Release the key and by using the “UP” and “DOWN” keys, it will be
possible to select a new group.
To exit the programming mode, no key should be pressed for
approx. 20 seconds, or keep the “UP” or “DOWN” pressed until exit
from the programming mode is obtained.
The programming and exit modes for the “OPEr” menu are the
same as those described for menu “ConF” with the difference that
to access the menù "OPEr" the Password is not required.

Longer

Hold

2 sec.

Hold for

2 sec.

Hold fo r

ATTENTION: The instrument is programmed in factory with all the
parameters, to exception of the Set Point "SP1" (and 2,3,4),
programmable in the menù "ConF" to the purpose to prevent wrong
accidental programming from non experienced consumers.

2.3 - PARAMETERS PROGRAMMING LEVELS

The menu “OPEr” normally contains the parameters used to
program the Set Point; however it is possible to make all desired
parameters appear or disappear on this level, by following this
procedure:
Enter the menu “ConF” and select the parameter to be made
programmable or not programmable in the menu “OPEr”.
Once the parameter has been selected, if the LED SET is switched
off, this means that the parameter is programmable only in the
menu “ConF”, if instead the LED is on, this means that the
parameter is also programmable in the menu “OPEr”.
To modify the visibility of the parameter, push key “U” : the LED
SET will change its state indicating the parameter accessibility level
(on = menu ”OPEr” and “ConF”; off = menu “ConF” only).
The active Set Point and the alarm thresholds will only be visible on
the Set Point fast programming level (described in par. 2.1) if the
relative parameters are programmed to be visible (i.e. if they are
present in the menu “OPEr”).
The possible modification of these Sets, with the procedure
described in par. 2.1, is instead subordinate to what is programmed
in par. “Edit” (contained in the group “

]

PAn “).

This parameter can be programmed as :

=SE : The active Set Point can be modified while the alarm
thresholds cannot be modified.
=AE : The active Set Point cannot be modified while the alarm
thresholds can be modified
=SAE : Both the active Set Point and the alarm thresholds can be
modified
=SAnE : Both the active Set Point and the alarm thresholds cannot
be modified

2.4 - CONTROL STATE

The controller can act in 3 different ways : automatic control (rEG),
control off (OFF) and manual control (OPLO).
The instrument is able to pass from one state to the other :

- by selecting the desired state from the main selection menu suing
the keyboard.

- By using the key “U” on the keyboard; suitably programming par.
“USrb” (“USrb” = tunE; “USrb” = OPLO; “USrb” = OFF) it is possible
to pass from “rEG” state to the state programmed on the parameter
and vice versa.

- Automatically (the instrument swaps into "rEG" state at the and of
the auto-tuning execution)
When switched on, the instrument automatically reassumes the
state it was in when it was last switched off.
AUTOMATIC CONTROL (rEG) – Automatic control is the normal
functioning state of the controller.
During automatic control, on the SV display, it is possible to
visualize the control power on the display by pushing key “UP”.
The range of the power values goes from H100 (100% of the
output power with reverse action) to C100 (100% of the output
power with direct action).
CONTROL OFF (OFF) – The instrument can be swapped into the
“OFF” state, i.e. the control and the relative outputs are
deactivated.
The alarm outputs are instead working normally.
BUMPLESS MANUAL CONTROL (OPLO) – By means of this
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.
In case of ON/OFF control, 0% corresponds to the deactivated
output while any value different from 0 corresponds to the activated
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).
In case of motorized actuators with time positioning, the manual
control of the output is obtainable in the following way :

- By pushing the UP key, the opening of the actuator is driven

- By pushing DOWN key, the closing of the actuator is driven
For all time during which the manual control is active, “3 Pt” or
“OPEn” is visible on the lower display if the UP key is pressed or
“CLOS” if the DOWN key is pressed.
To return to automatic control, select "rEG" in the selection menu.

2.5 - ACTIVE SET POINT SELECTION

This instrument permits pre-programming of up to 4 different Set
points (“SP1”, “SP2”, “SP3”, “SP4”) and then selection of which
one must be active. The maximum number of Set points is
determined by the par. "nSP" located in the group of parameters “

]

SP “.

The active Set point can be selected :

- by parameter "SPAt" in the group of parameters “

]

SP “.

- by key “U” if par. "USrb" = CHSP

- by digital input if par. “diF” = CHSP or = SP1.2 or =HECo)

- Automatically between SP1 and SP2 if a time “dur.t” (see par.

4.12) has been programmed.
Set Points “SP1”, “SP2”, “SP3”, “SP4” will be visible depending on
the maximum number of Set Points selected on par. “nSP” and
they can be programmed with a value that is between the value
programmed on par. “SPLL” and the one programmed on par.
“SPHL”.

TECNOLOGIC spa - TLK 94 -OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 3

Note : in all the following examples the Set point is indicated as
"SP", however the instrument will act according to the Set point
selected as active.

3 - INFORMATION ON INSTALLATION AND USE

3.1 - PERMITTED USE

The instrument has been projected and
manufactured as a measuring and control device
to be used according to EN61010-1 for the
altitudes operation until 2000 ms.

The use of the instrument for applications not
expressly permitted by the above mentioned rule must adopt all the
necessary protective measures.
The instrument CANNOT be used in dangerous environments
(flammable or explosive) without adequate protection.
The installer must ensure that EMC rules are respected, also after
the instrument installation, if necessary using proper filters .
Whenever a failure or a malfunction of the device may cause
dangerous situations for persons, thing or animals, please
remember that the plant has to be equipped with additional devices
which will guarantee safety.

3.2 - MECHANICAL MOUNTING

The instrument, in DIN case 48 x 96 mm, is designed for flush-in
panel mounting.
Make a hole 45 x 92 mm and insert the instrument, fixing it with the
provided special brackets.
We recommend that the gasket is mounted in order to obtain the
front protection degree as declared. Avoid placing the instrument in
environments with very high humidity levels or dirt that may create
condensation or introduction of conductive substances into the
instrument.
Ensure adequate ventilation to the instrument and avoid installation
in containers that house devices which may overheat or which may
cause the instrument to function at a higher temperature than the
one permitted and declared.
Connect the instrument as far away as possible from sources of
electromagnetic disturbances such as motors, power relays, relays,
solenoid valves, etc.
The instrument can be removed from its housing from the front side
: it is recommended that the instrument be disconnected from the
power supply when it is necessary to carry out this operation.

3.3 - ELECTRICAL CONNECTION

Carry out the electrical wiring by connecting only one wire to each
terminal, according to the following diagram, checking that the
power supply is the same as that indicated on the instrument and
that the load current absorption is no higher than the maximum
electricity current permitted.
As the instrument is built-in equipment with permanent connection
inside housing, it is not equipped with either switches or internal
devices to protect against overload of current: the installation will
include an overload protection and a two-phase circuit-breaker,
placed as near as possible to the instrument, and located in a
position that can easily be reached by the user and marked as
instrument disconnecting device which interrupts the power supply
to the equipment.
It is also recommended that the supply of all the electrical circuits
connected to the instrument must be protect properly, using
devices (ex. fuses) proportionate to the circulating currents.
It is strongly recommended that cables with proper insulation,
according to the working voltages and temperatures, be used.
Furthermore, the input cable of the probe has to be kept separate
from line voltage wiring. If the input cable of the probe is screened,
it has to be connected to the ground with only one side.
We recommend that a check should be made that the parameters
are those desired and that the application functions correctly before
connecting the outputs to the actuators so as to avoid
malfunctioning that may cause irregularities in the plant that could
cause damage to people, things or animals.

3.4 - ELECTRICAL WIRING DIAGRAM

Out2,3, 4,5: 4A-AC1( 2A-AC3)/ 250 VAC

Out1: 6A-AC1(3A-AC3)/ 250 VAC

Pt100

A

B

GND

Out6

+12 V DC

0/1..5 V

0/2..10 V

+

0/4..20

(acti ve)(pas sive)

4..20
mA mA

+

+

NTC

INPUT

PTC

TA HB

RS485

NO

G

4b

ANALOG .: 0/4. .20mA - 0/2 ..10V

1b

TC

+

2b

3b

RELAYS:

OUTPUTS

SSR: 12 VDC/20 mA

6b

5b

1a

2a

4a

3a

++

NO

+ +

G

NC

C

+

C

NO

DIG. IN 2

DIG. IN 1

5a

6a

+

+

Out1

10b

SUPPL

Y

7b

9b

8b

Out2

12b

11b

7a

Out4

Out3

9a

8a

10a

Out5

12a

11a

TLK 94

4 - FUNCTIONS

4.1 - MEASURING AND VISUALIZATION

All the parameters referring measurements are contained in the
group

“]InP”.

By using par.

“HCFG”,

it is possible to select the input signal type
which may come: from a thermocouple (tc), a thermo-resistance or
a thermistor (rtd), from a transducer with normalised analogue
signal in current (I) or tension (UoLt) or also from a signal coming
from the communication serial line of the instrument (SEr).
Once the signal type has been selected, it is necessary to set the
type of input probe on par.

“SEnS”,

which can be :

- for thermocouples J (J), K (CrAL), S (S), B (b), C (C), E (E), L (L),
N (n), R (r), T (t) or for infrared sensors serie TECNOLOGIC IRS –
A range - with linearization J (Ir.J) or K (Ir.CA)

- for thermoresistances Pt100 IEC (Pt1) or thermistors PTC
KTY81-121 (Ptc) or NTC 103AT-2 (ntc)

- for normalised signals in current 0..20 mA (0.20) or 4..20 mA
(4.20)

- for normalised signals in tension 0..50 mV (0.50), 0..60 mV (0.60),

12..60 mV (12.60), 0..5 V (0.5), 1..5 V (1.5), 0..10 V (0.10) or 2..10
V (2.10).
We recommend that the instrument be switched on and off
whenever these parameters are modified, in order to obtain a
correct measurement.
For the instruments with input for temperature probes (tc, rtd) it is
possible to select the unit of measurement (°C, °F) through par.

“Unit”,

and the desired resolution (0=1°; 1=0,1°) through par.

“dP”

.
Instead, with regards to the instruments with normalised analogue
input signals, it is first necessary to program the desired resolution
on par.

“dP”

(0=1; 1=0,1; 2=0,01; 3=0,001) and then, on par.

"SSC"

, the value that the instrument must visualise at the
beginning of the scale (0/4 mA, 0/12 mV, 0/1 V o 0/2 V) and, on
par.

"FSC",

the value that the instrum ent must visualise at the end
of the scale (20 mA, 50 mV, 60 mV, 5 V or 10 V).
In the case of infrared sensors (TECNOLOGIC IRS-"A" range), by
programming the sensor as "Ir.J" or "Ir.CA", the par. "

rEFL

" is also
present and it allows the correction of possible measuring errors
caused by the environment lighting and by the reflectivity of the
material. This parameter should be programmed with a high value
if the material to be measured is particularly bright / reflective and
must be reduced if the surface is particularly dark / not reflective,
keeping in mind however that for most materials, the recommended
value is within 1.00 and 0.80.
The instrument allows for measuring calibration, which may be
used to recalibrate the instrument according to application needs,
by using par.

“OFSt”

and

“rot”.

TECNOLOGIC spa - TLK 94 -OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 4

Programming par. “rot”=1,000, in par. “OFSt” it is possible to set a
positive or negative offset that is simply added to the value read by
the probe before visualisation, which remains constant for all the
measurements.
If instead, it is desired that the offset set should not be constant for
all the measurements, it is possible to operate the calibration on
any two points.
In this case, in order to decide which values to program on par.
“OFSt” and “rot”, the following formulae must be applied :

“rot” = (D2-D1) / (M2-M1) “OFSt” = D2 - (“rot” x M2)

where:
M1 =measured value 1
D1 = visualisation value when the instrument measures M1
M2 =measured value 2
D2 = visualisation value when the instrument measures M2
It then follows that the instrument will visualise :

DV = MV x “rot” + “OFSt”

where: DV = visualised value MV= measured value
Example 1:

It is desired that the instrument visualises the value
effectively measured at 20° but that, at 200°, it visualises a value
lower than 10° (190°).
Therefore : M1=20 ; D1=20 ; M2=200 ; D2=190
“rot” = (190 - 20) / (200 - 20) = 0,944
“OFSt” = 190 - (0,944 x 200) = 1,2
Example 2:

It is desired that the instrument visualises 10° whilst the
value actually measured is 0°, but, at 500° it visualises a 50° higher
value (550°).
Therefore : M1=0 ; D1=10 ; M2=500 ; D2=550
“rot” = (550 - 10) / (500 - 0) = 1,08
“OFSt” = 550 - (1,08 x 500) = 10
By using par.

“FiL”

it is possible to program time constant of the
software filter for the input value measured, in order to reduce
noise sensitivity (increasing the time of reading).
In case of measurement error, the instrument supplies the power
as programmed on par.

“OPE”.

This power will be calculated according to cycle time programmed
for the PID controller, while for the ON/OFF controllers the cycle
time is automatically considered to be equal to 20 sec. (e.g. In the
event of probe error with ON/OFF control and “OPE”=50, the
control output will be activated for 10 sec., then it will be
deactivated for 10 sec. and so on until the measurement error
remains.).
By using par.

“InE”

it is also possible to decide the conditions of
the input error, allowing the instrument to give the power
programmed on par. “OPE” as output.
The possibilities of par. “InE” are :
= Or : the condition occurs in case of over-range or probe breakage
= Ur : the condition occurs in case of under-range or probe
breakage
= OUr : the condition occurs in case of over-range or under-range
or probe breakage
Using par.

“diSP”,

located in the group

“]PAn”,

it is possible to set
normal visualization of the SV display which can be the active Set
Point (SP.F), the control power (Pou), the Set Point operating when
there are active ramps (SP.o) or alarm threshold AL1, 2, 3, 4 .

4.2 - OUTPUT CONFIGURATION

The instrument’s outputs can be programmed by entering the
group of parameters

“]Out”

where different parameters (depending
on the type of outputs - digital or analogue - available on the
instrument) are located.

Note:

In the following examples, the number of outputs is

generically indicated with n

- DIGITAL OUTPUTS relay or SSR type :

The par.

“OnF”

can be set for the following functions :
= 1.rEG : Main control output
= 2.rEG : Secondary control output
= ALno : Alarm output normally open
= ALnc : Alarm output normally closed
= On : Output always activated
= OFF : Output deactivated
The coupling outputs number outputs – number alarms can be
made in the group referring to the alarm to the alarm (“

]

AL1, 2, 3,

4”). The option "On" it results usable for the output OUT6 (standard
on all the models) to have an auxiliary supply output for input
sensors

- ANALOGICAL OUTPUTS 0/4..20 mA or 0/2..10 V (only
OUT1,2):

With the param eter

“Aorn”

it is possible to set the beginning of the
scale used for the output.
This parameter will therefore be set at:
= 0 : if one intends to use the beginning of the scale as equal to 0
(0 mA if the output is 0/4...20 mA, or 0 V if the output is 0/2...10 V)
= no_0 : if one intends to use the beginning of the scale other than
0 (4 mA if the output is 0/4...20 mA, or 2 V if the output is 0/2...10
V)
The param eter

“AonF”

will be present by which it is possible to
configure the function of the analogical output as:
= 1.rEG : Primary control output
= 2.rEG : Secondary control output
= r.inP : measurement retransmission output
= r.Err : error retransmission output [SP-PV]
= r.SP : Active Set Point retransmission output
= r.SEr : output led by serial communication line of the instrument
= OFF : deactivated output
In the case that analogical output is configured as 1.rEG or 2.rEG
the output signal will be proportional to the control power
calculated by the instrument starting from 0% (output signal
corresponding to the set beginning of the scale) up to 100% (output
signal corresponds to the maximum that can be supplied by the
type of output available).
The analogical control outputs can only be used for PID single
action or dual action controls.
If the set control mode was the ON/OFF type, the analogical output
could only take on the control states 0 % or 100 %.
In the case that the analogical output function should be configured
for the retransmission of the signal, it is therefore necessary to
programme another two parameters which set the minimum and
maximum reference values.
Therefore, in these cases, set the parameter

"AonL"

with the value
that the instrument must provide the minimum value (0/4 mA or 0/2
V) in output and the value to which the instrument must provide the
maximum value (20 mA o 10 V) to the parameter

"AonH"

in output.

4.3 - ON/OFF CONTROL (1.rEG)

All the parameters referring to the ON/OFF control are contained in
the group

“]rEG”.

This type of control can be obtained by programming par.

"Cont"

=

On.FS or = On.FA and works on the output programmed as

1.rEG,

depending on the measure, on the active Set Point

“SP”

, on the

functioning mode

"Func”

and on the hysteresis

"HSEt

".
The instrument carries out an ON/OFF control with symmetric
hysteresis if “Cont" = On.FS or with asymmetrical hysteresis if
“Cont” = On.FA.

OUT

SP

PV

off

ON

HEAt - On.FA

OUT

time

HSEt

SP

PV

HSEt

time

CooL - On.FA

ON ON ON ON ON

off off off

CooL - On.FSHEAt - On.FS

ONON

OUT

SP

off

PV

off

ON

HSEt

time

OUT

ON

SP

PV

ON

off off

ON

time

HSEt

HSEt

HSEt

1.rEG 1.rEG

1.rEG1.rEG

The control works in the following way : in the case of reverse
action, or heating (“FunC”=HEAt), it deactivates the output, when
the process value reaches [SP + HSEt] in case of symmetrical
hysteresis, or [SP] in case of asymmetrical hysteresis and is then
activated again when the process value goes below value [SP ­HSEt]. Vice versa, in case of direct action or cooling
("Func”=CooL), it deactivates the output, when the process value

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 5

reaches [SP - HSEt] in case of symmetrical hysteresis, or [SP] in
case of asymmetrical hysteresis and is activated again when the
process value goes above value [SP + HSEt].

4.4 - NEUTRAL ZONE ON/OFF CONTROL (1.rEG - 2.rEG)

All the parameters referring to Neutral Zone ON/OFF control are
contained in the group

“]rEG”.

This type of control can be obtained when 2 outputs are
programmed respectively as 1.rEG and 2.rEG and the par.

“Cont”

= nr .
The Neutral Zone control is used to control plants in which there is
an element which causes a positive increase (ex. Heater,
humidifier, etc.) and an element which causes a negative increase
(ex. Cooler, de-humidifier, etc).
The control functions works on the programmed outputs depending
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],
or it activates the output 2.rEG when the process value goes above
[SP + HSEt].
Consequently, the element causing a positive increase has to be
connected to the output programmed as 1.rEG while the element
causing a negative increase has to be connected to the output
programmed as 2.rEG.

0N

OUT 2.rEG

(cooling)

OUT 1.rEG

(heating)

SP

PV

off

0N

off

off

off

0N

time

HSEt

HSEt

4.5 -SINGLE ACTION PID CONTROL (1.rEG)

All the parameters referring to PID control are contained in the
group

“]rEG”.

The Single Action PID control can be obtained by programming
par.

"Cont"

= Pid and works on the output 1.rEG depending on the

active Set Point

“SP”

, on the functioning mode

"Func”

and on the

instrument’s PID algorithm with two degree of freedom.

0N

0%

(H E At)

1.rEG

ANALOG.

100%

tcr1

1.rEG

(H E At)

DIG.

SP

PV

tcr1

off

tcr1tcr1 tcr1 tcr1

0N

off off

0N

offoff

0N 0N

tcr1

off

0N

0N

tim e

In order to obtain good stability of the process variable, in the event
of fast processes and with control by digital output, the cycle time
“tcr1” has to have a low value with a very frequent intervention of
the control output.
In this case use of a solid state relay (SSR) is recommended for
driving the actuator.
The Single Action PID control algorithm foresees the setting of the
following parameters :

"Pb"

- Proportional Band

"tcr1"

- Cycle time of the output 1rEG (digital output only)

"Int"

- Integral Time

"rS"

- Manual Reset (if “Int =0 only)

"dEr"

- Derivative Time

“FuOC” -

Fuzzy Overshoot Control
This last parameter allows the variable overshoots at the start up of
the process or at the changing of the Set Point to be avoided.
Please remember that a low value on this parameter reduces the
overshoot while a high value increase it.

2

1

3

SP

PV

time

1: “FuOC” OK
2: “FuOC” too high
3: “FuOC” too low

4.6 - DOUBLE ACTION PID CONTROLLER (1.rEG - 2.rEG)

All the parameters referred to PID control are contained into the
group

“]rEG”.

The Double Action PID control is used to control plants where there
is an element which causes a positive increment (ex. Heating) and
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
the output programmed as 1.rEG while the element causing a
negative increase has to be connected to the output programmed
as 2.rEG.
The Double Action PID control works on the outputs 1.rEG and

2.rEG depending on the active Set Point

“SP”

and on the
instrument’s PID algorithm with two degree of freedom.
In order to obtain a good stability of the process variable, in case of
fast processes and with control by digital outputs, the cycle times
“tcr1” and “tcr2” have to have a low value with a very frequent
intervention of the control outputs.
In this case it’s recommended to use solid state relays (SSR) to
drive the actuators.
The Double Action PID control algorithm needs the programming of
the following parameters :

"Pb"

- Proportional Band

"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

“FuOC” -

Fuzzy Overshoot Control

"Prat"

- Power Ratio or relation between power of the element
controlled by output 2.rEG and power of the element controlled by
output 1.rEG.

4

.7 - PID CONTROL FOR MOTORIZED ACTUATORS WITH TIME

POSITIONING (1.rEG - 2.rEG)

All the parameters concerning the PID control for motorised
actuators are contained in the group

“]rEG”.

This type of control is used to control installations that have a
motorised actuator with digital opening and closing controls that
remain at the point they have reached if no command is received
and which are started up when 2 outputs are configured as 1.rEG
and 2.rEG respectively and the parameter

“Cont”

= 3 Pt is set.
The opening command for actuation will be supplied by the output
configured as 1.rEG while the closing command will be supplied by
the output configured as 2.rEG.
The PID type control for motorised actuators therefore acts on the
outputs 1.rEG and 2.rEG depending on the active Set point

“SP”

TECNOLOGIC spa - TLK 94 -OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 6