ascon K31D Operating Instructions Manual

K31D

ELECTRONIC TEMPERATURE

CONTROLLER WITH

DIFFERENTIAL CONTROL MODE

OPERATING INSTRUCTIONS

Vr. 05 (Eng) - 19/04 - cod.: ISTR-MK31DENG05

Ascon Tecnologic S.r.l.

Viale Indipendenza 56, 27029 Vigevano (PV) - ITALY
Tel.: [phone] - Fax: [phone]
Sito: http:\\www.ascontecnologic.com
e-mail: [e-mail]

PREFACE

This manual contains the information necessary
for the product to be installed correctly and also

m

This document is the exclusive property of Ascon Tecnologic
S.r.l. which forbids any reproduction and disclosure, even in
part, of the document, unless expressly authorized.

Ascon Tecnologic S.r.l. reserves the right to make any formal
or functional changes at any moment and without any notice.

Ascon Tecnologic S.r.l. 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.

m

instructions for its maintenance and use; we there­fore recommend that the most attention is paid to
the following instructions and to save it.

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.

Index

1. Instrument description ............................................... 1

1.1 General description ........................................................... 1

1.2 Front Panel Description ..................................................... 2

2. Programming ............................................................... 2

2.1 Set Point Fast Programming ............................................. 2

2.2 Control Status and Parameter Selection ........................... 2

2.3 Parameters programming levels .......................................3

2.4 Control Satus .................................................................... 3

2.5 Active Set Point Selection ................................................. 4

3. Usage warning ............................................................. 4

3.1 Admitted use ..................................................................... 4

4. Installation warnings ................................................... 4

4.1 Mechanical mounting ........................................................ 4

4.2 Dimensions (mm) .............................................................. 4

4.2.1 Mechanical dimensions ........................................................ 4

4.2.2 Panel cut-out ......................................................................... 4

4.2.3 Brackets ................................................................................ 4

4.3 Electrical connections ....................................................... 4

4.3.1 Electrical wiring diagram ....................................................... 5

5. Functions ..................................................................... 5

5.1 Measurement and display ................................................. 5

5.2 Output Configuration ......................................................... 6

5.3 Absolute or Differential Temperature Controller ................ 6

5.4 ON/OFF Control (1.rEG) .................................................... 6

5.5 Neutral Zone ON/OFF Control (1.rEG - 2.rEG) .................. 7

5.6 Single Action PID Control (1.rEG) ..................................... 7

5.7 Double Action PID Control (1.rEG - 2.rEG) ........................ 7

5.8 Auto-tuning and Self-tuning Functions .............................. 8

5.8.1 How to activate Auto-tuning function .................................... 8

5.8.2 How to activate Self-tuning function ..................................... 9

5.9 Dynamic Set Point change and automatic switching

between two Set Points (ramps an dwell time) ................. 9

5.10 Soft-start function .............................................................. 9

5.11 Alarms Output Functions (AL1, AL2, AL3) ...................... 10

5.12 Loop Break Alarm Function ............................................ 11

5.13 Functioning of Key .................................................... 11

5.14 Digital Input ..................................................................... 12

5.15 RS485 Serial Interface .................................................... 12

6. Accessories ............................................................... 13

6.1 Parameters configuration by “A01” .................................. 13

7. Programmable parameters ....................................... 14

8. Problems, Maintenance and Warranty ..................... 18

8.1 Probe errors .................................................................... 18

8.2 Other errors ..................................................................... 18

8.3 Cleaning .......................................................................... 18

8.4 Warranty and Repairs ..................................................... 18

8.5 Disposal .......................................................................... 18

9. Technical data ............................................................ 18

9.1 Electrical characteristics ................................................. 18

9.2 Mechanical characteristics .............................................. 18

9.3 Functional Features ........................................................ 19

10. How to order .............................................................. 19

1. INSTRUMENT DESCRIPTION

1.1 General description

The K31D model is a digital temperature controller with a
single loop microprocessor, with ON/OFF control, Neutral
Zone ON/OFF, single or double action PID (direct and

inverse) fitted with 2 PTC, NTC or Pt1000 temperature input
probes by means of which it is possible to obtain differential
temperature control. It can therefore be used in applications
that require a control for the temperature difference between
2 different environments such as liquid coolers (chillers),
natural air-conditioning systems through the air recirculation,
heating by solar panels or in many other applications where
2 temperature readings are needed.

The controller is also

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 1

equipped with Fast and Oscillatory

Auto-tuning, Self-tuning
and Fuzzy overshoot control for adjusting the PID. The
instrument offers the possibility of having 2 programmable
digital inputs and an RS485 serial communications port
using MODBUS-RTU communications protocol with a trans-
mission speed up to 38.4 kbaud.

The process value is displayed on a 4 digit red display, while
the outputs status is shown by 4 LEDs.

The controller is
display ( ),

equipped with a programmable 3 LEDs shift

stores 2 Set Points and can have up to
4 outputs [relay or solid state relays drive type (SSR)]. A
model is also available with Out1 analogue control output
(0/4 ÷ 20 mA or 0/2 ÷ 10 V type).

Other important available functions are: Loop-Break Alarm
function, reaching of the Set Point at controlled speed,

ramp and dwell function, Soft-Start function, protection
compressor function for neutral zone control, parameters
protection on different levels.

1.2 Front Panel Description

9

Tun

13
12
11

5

Out1 Out2 Out3 Out4

6

1 : This key is used to access the programming param-

eters and to confirm selection;

2 : This key is used

to select the parameters. If the key is held down, the user
returns to the previous programming level until it exits the
programming mode

3 : This key 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 it exits the
programming mode. Outside the programming mode it
permits the visualisation of the output control power;

4 : This key is used to display the temperatures read by

the probes (Pr1 and Pr2) and their difference (
It can also be programmed through the
for: Activating Auto-tuning or Self-tuning, setting the in­strument to manual regulation, setting the alarm, chang­ing the active Set Point and deactivating the control;

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 Tu n: Indicates that the Self-tuning function is activat-

ed (light ON) or that Auto-tuning is in progress (flashing);

10 LED SET: When flashes, indicates the access to the

programming mode;

11 LED Shift index -: Indicates that the process value is

lower than the one programmed for parameter AdE;

12 LED Shift index =: Indicates that the process value is

within the range [SP + AdE÷SP - AdE];

13 LED Shift index +: Indicates that the process value is

higher than the one set for parameter AdE.

to decrease the values to be set and

;

U

P

K31D

87

USrb

4

3

1

2

10

Pr1 - Pr2

parameter

).

2. PROGRAMMING

2.1 Set Point Fast Programming

This procedure allows you to quickly set the active Set Point
and, when required, the alarm thresholds (paragraph 2.3).

Press and release the key, the display the display will
alternate between “SP n” and the set value (n is the number
of the Set Point active at that moment).

To increase/decrease the Set Point value press the / keys.
These keys change the value one digit a time but when pressed
for more than one second, the value increases or decreases
rapidly and, if pressed for more than two seconds, the changing
speed increases further to allow the rapid achievement of the
desired value.

Once the desired value has been reached, pressing key
it is possible to exit the Set Point fast programming mode or
switch to the alarm thresholds display (paragraph 2.3).

To exit the Set Point fast programming mode it is necessary to
press the key after the last Set Point has been displayed,
alternatively, operating no keys for about 15 seconds the dis­play will return to normal operation.

2.2 Control Status and Parameter Selection

By pushing key and holding it down for about 2 s it is pos­sible to enter into the main selection menu. Using the /
keys, it is then possible to roll over the selections:

oPEr

ConF

tunE

oPLo

Once the desired item has been selected, push key to
confirm. Selecting oPEr and ConF gives the possibility of
accessing other menus containing additional parameters and
more precisely:

oPEr Operating parameters Menu: normally contains the

ConF

To enter the menu oPEr, select the option oPEr and press .

To enter into the operating parameters menu
To enter into the configuration parameters menu

oFF

To swap the controller into the OFF state

rEG

To swap the controller into the automatic control state
To activate the Auto-tuning or Self-tuning function

To swap the controller to the manual control state
and therefore to program the % control value using
the / keys

Set Point parameters but it can contain all the desired
parameters (paragraph 2.3).

Configuration parameters Menu: contains all the operat­ing parameters and the functioning configuration param­eters (alarm configuration, control, input, etc.).

rEG

282.8

oPEr

menu

PASS = OFF

SET

PASSWORD

oFF

off

AUTOTUNING
SELFTUNING

AT-ST

282.8

oPLo

oplo

ConF

menu

Hold
for 2 s

reg .

0per.

Conf.

off .

tune.

oplo.

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 2

The display will now show the code identifying the first group of
parameters (]SP) and, by pressing the and keys, it will
be possible to select the group of parameters to be modified.

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 key.

Again using the and keys, it is possible to select the
desired parameter and, if is pressed, the display will alter­natively show the parameter code and its programming value,
which can be modified by using the / keys.

As the desired value has been programmed, press once
again: the new value will be stored and the display will show
only the code of the selected parameter.

By using the / 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 or key
pressed for about 2 s, afterwards the display shows again the
code of the group of parameters.

Release the key and, using the or keys, select a new
group (if present).

To exit the programming mode, press no keys for about 20
seconds, or keep the or pressed until the controller
exits the programming mode.

To access the ConF menu, the controller can ask for a person­alized Password previously set through the PASS parameter.

If the protection is requested, set the desired password number
in the PASS parameter and exit the programming parameters.

When the protection is active, to access the Conf menu pa­rameters, it is necessary to insert the programmed password
number; to do that, use the

and

keys to make the num­bers scroll on the display until the previously programmed PASS
number is shown on the screen, at this point press the key.

If a wrong PASS number is entered, the instrument returns to
the previous control state.

If the password is correct, the display shows the code of first
group of parameters (]SP) and, using the /

keys,

is pos-

sible to select the desired group of parameters.
The modes to program and exit the ConF menu parameters

are the same described for those in the oPEr menu.
The protection Password is deactivated by setting: PASS = OFF.

Menu

OPEr

or

conF

or

EXIT

Parameter groups Parameters Set parameter

2 s

Preceding
Group

Next
Group

Longer than2 s

2 s

or

Previous
Parameter

Next
Parameter

Increase
value

Decrease
value

Note: If the password is lost, turn OFF the instrument, press

and turn the instrument back ON keeping the key
held down for about 5 s. In this way access is made to
all parameters of the ConF menu and it will therefore
be possible to check and modify the PASS parameter.

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
OFF, this means that the parameter is programmable only in
the menu ConF, if instead the SET LED is ON, this means
that the parameter is also programmable in the menu oPEr.

To modify the visibility of the parameter, press key : the LED
SET changes its state indicating the parameter accessibility
level (ON = oPEr + ConF menus; OFF = ConF menu only).

The active Set Point and the alarm thresholds will only be
visible on the Set Point fast programming level (paragraph

2.1) if the relative parameters are programmed to be visible
(i.e. if they are present in the oPEr menu).

The possible changes to these Set Points, with the proce­dure described in paragraph 2.1, is instead subordinate to
what is programmed in parameter Edit (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 Satus

The controller can act in 3 different ways:

rEg Automatic control;
oFF Control OFF;
oplo Manual control.

The instrument is able to pass from one state to the other:

– Through the instrument keyboard to selecting the desired

status from the main selection menu;

– By using the key on the keyboard; suitably program-

ming parameter USrb (USrb = tunE; USrb = oPLo;
USrb = OFF) it is possible to pass from rEG state to the
state programmed for the parameter and vice versa;

– By using the digital input 1 suitably programming param-

eter diF (diF = OFF) it is possible to pass from rEG state
to the state OFF and vice versa.

– Automatically (the instrument swaps into rEG state at the

end of the auto-tuning execution).

When switched ON, the instrument automatically resumes
the status it was in when it was switched OFF.

rEG

Automatic control: Automatic control is the normal func­tioning status of the controller. During automatic control,
pressing key , is possible to show, on the display, the
control power. The range of the power value goes from:

H100 (100% of output power for reverse heating action);
C100 (100%

oFF Control OFF: The instrument can be swapped into

the OFF status, i.e. the control and the relative outputs
are deactivated. The alarm outputs are instead work­ing normally.

oPLo Bumpless manual control: 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 is the same as the last one supplied
and can be modified using the
of ON/OFF type setting, 0% corresponds to the output

of output power for

/

direct cooling action).

keys.

In the case

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 3

OFF, while any value different from 0 corresponds to

86 min.

34

an activated output.
As in the case of automatic control, the programmable
values range from H100 (+100%) to C100 (-100%).
To return to automatic control, select rEG in the selec­tion menu.

2.5 Active Set Point Selection

This instrument allows to program up to 2 different Set Points
(SP1, SP2) and select which must be considered active.

The number of Set Points is determined by the parameter nSP
located in the

The active Set Point can be selected:

– By parameter
– By key if parameter USrb = CHSP;
– By the digital inputs if parameter diF has been correctly pro-

grammed (diF = CHSP, diF = SP1.2, diF = HE.Co);

– Automatically between

graph 5.9) has been programmed.

Set Points SP1, SP2 will be visible depending on the maxi­mum number of Set Points selected with parameter nSP and
they can be programmed with a value that is between the
value programmed in SPLL and the one programmed in SPHL.

Note: In examples that follow the Set Point is indicated as

]SP

parameters group.

SPAt

in the group of parameters

SP1 and SP2

SP

, however the instrument will act according to the

Set Point selected as active

if a time

.

]SP

dur.t

;

(para-

4.2 Dimensions (mm)

4.2.1 Mechanical dimensions

78

Tun

Out1 Out2 Out3 Out4

5.5 64

4.2.2 Panel cut-out

K31D

U

P

35

12

2828

14.5

18.5

3. USAGE WARNING

3.1 Admitted use

The instrument has been projected and manufactured as
a measuring and control device to be used according to

m

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 MUST NOT 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.

4. INSTALLATION WARNINGS

4.1 Mechanical mounting

The instrument, in case 78 x 35 mm, is designed for flush­in panel mounting. Make a hole 71 x 29 mm and insert the
instrument, fixing it with the provided special brackets.

The instrument can be mounted on panels having a maxi­mum thickness of 12 mm.

When the maximum front protection (IP65) is desired, the
optional screw type bracket must be used.

Avoid placing the instrument in environments with very high
humidity levels or dirt that may create condensation or cause
the 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
temperature higher 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..

+0.6

29

41 min.

+0.6

71

4.2.3 Brackets

Brackets

Panel thickness: 12 mm max.

4.3 Electrical connections

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

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 4

instrument and that the load current absorption is no higher
than the maximum electricity current permitted.

As the instrument is a built-in equipment with permanent
connection inside housing, it is not equipped with either
switches or internal devices to protect against current
overloads: the installation must include a two-phase circuit­breaker, 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 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 must be kept separat­ed from line voltage wiring. If the wiring cables are shielded is
recommended to connect the shield to ground at one side only.

For the electrical supply of the instrument it is recommended
to use an external transformer TCTR, or with equivalent fea­tures, and to use only one transformer for each instrument
because there is no insulation between supply and input.

We recommend that a check should be made that the
parameters are those desired and that the application

m

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.

4.3.1 Electrical wiring diagram

RS485

Pr1

Ptc/Ntc/
Pt1000

Pr2

Analogue input Digital input Serial interface

SSR: Out 1, 2, 3, 4: 10mA/10VDC
Relays: Out-1, 2: 8A-AC1 (3A-AC3)/250VAC
Out-3, 4: 5A-AC1 (2A-AC3)/250VAC

Power
Supply

DI2DI1

B GND A

Analog: Out 1: 0/4... 20mA or
0/2... 10VDC

OUT1OUT2OUT3OUT4

5. FUNCTIONS

5.1 Measurement and display

All the parameters referring measurements are contained in
the group

Using parameter SEnS, it is possible to select the probe input
type, which can be:

– Thermistors PTC KTY81-121 (Ptc) or NTC 103AT-2 (ntc);
– ResistanceThermometer Pt1000 (Pt10).

Notes: 1. We recommend to switch ON and OFF the instru-

Once the type of probe has been chosen, through the Unit
parameter it is possible to choose the temperature meas­urement unit (°C or °F) and through the dP parameter, the
desired temperature resolution (0 = 1°; 1 = 0.1°).

If the Pr2 probe is not used set parameter Pr2 = NO to avoid
an error being indicated when the probe is not connected.

]InP

.

ment when these parameters are modified, in
order to obtain a correct measuring.

2. When 2 temperature probes are connected to the
controller they must be of the same type.

The instrument allows the measurement calibration, that can
be used to recalibrate the instrument according to application
needs. This can be done through parameters OFS1, OFS2
and rot.

Setting rot = 1000 and oFS = 1/2 it is possible to set a posi-
tive 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 con-
stant for all measurements, it is possible to execute a two
points calibration.

In this case, in order to decide the values to program on

OFSt and rot, the following formulas must be applied:
rot = (D2 - D1)/(M2 - M1) oFS = D2 - (rot x M2)

where:

M1 Measured value 1;
D1

Value to be displayed when the instrument measures M1;

M2 Measured value 2;
D2

Value to be displayed when the instrument measures

M2;
Follows that the instrument will visualise:
DV = MV x rot + oFS
Where: DV = Displayed value MV= Measured value.
E.g.: It is desired that the instrument displays the value ef-

fectively measured at 20° but that, at 100°, it displays 90° (10°
lower than the measured value).

Therefore: M1 = 20; D1 = 20; M2 = 100; D2 = 90

rot = (90 - 20)/(100 - 20) = 0.875
oFS = 90 - (0.875 x 100) = 2.5

With parameter 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 reading time).

In case of measurement error, the instrument supplies the
power as programmed on parameter OPE. This power is calcu­lated according to cycle time programmed for the PID control,
while for the ON/OFF control the cycle time is automatically
considered to be 20 s (e.g. In the event of probe error with ON/
OFF control and oPE = 50, the control output will be activated
for 10 s, then deactivated for 10 s and so on until the measure­ment error remains.).

With InE parameter it is possible to decide the input error con­ditions that force the instrument in supplying the output power
programmed with oPE parameter.

The possible values for InE parameter are:
or

The condition occurs in case of overrange or probe break.

Ur

The condition occurs in case of underrange or probe break.

Our The condition occurs in case of overrange, underrange

or probe break.

Through the diSP parameter of the ]PAn group it is possible to
decide which value the display must normally show; this could
be the Pr1 probe reading (Pr 1), the Pr2 probe reading (Pr 2),
the temperatures Pr1 - Pr2 difference (P1-2), the power con­trol (Pou), the active Set Point (SP.F), the operative Set Point

when there are ramps activated (SP.o) or the alarm limit AL 1,
AL 2, AL 3 (AL1, AL2, AL3).

Regardless of diSP parameter setting is possible to show the
variables Pr1, Pr2 and Pr1 - Pr2 in sequentially, pressing and
releasing the key, the display alternately shows the code that
identifies the variable (Pr 1, Pr 2, P1-2), then and its value.

After 15 seconds following the last time the key is pressed,
this type of display ends automatically.

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 5

Again in the ]PAn group is present the parameter AdE that
defines the 3 LEDs shift index ( ) functioning.

The lighting up of the green LED (=) indicates that the
process value is within the range [SP + AdE÷SP - AdE], the
lighting up of the LED (-) indicates that the process value
is lower than [SP - AdE] and the lighting up of the LED (+)
indicates that the process value is higher than [SP + AdE].

5.2 Output Configuration

The instrument outputs can be programmed by entering the
group of parameters ]Out, where the relative parameters
o1F, o2F, o3F and o4F (depending on the number of out­puts available on the instrument) are located.

The outputs can be set for the following functions:

1.rEG Main control output;

2.rEG Secondary control output;
ALno Alarm output normally open (NO);
ALnc Alarm output normally closed (NC);
ALni

Alarm output NC with LED reverse indication;
oFF Output deactivated.
The coupling between output-number – alarm-number can

be made in each alarm group referred to each alarm (]AL1,
]AL2 or ]AL3).

If the instrument has an analogue control output, the type of
output can be selected using the Aot parameter in the group]
InP with the following possibilities:

0-20 0
4-20 4
0-10 0
2-10 2

÷

20 mA;

÷

20 mA;

÷

10 V;

÷

10 V.

5.3 Absolute or Differential Temperature

Controller

Through the PrrG parameter it is possible to set the process
variable used by the controller to operate.

In fact the controller can operate considering the process
variable as the value measured at Input 1 (Pr1), the value
measured at Input 2 (Pr2), the difference between the two
inputs Pr1-Pr2 (P1-2) or can consider the difference be­tween the two inputs Pr1-Pr2 but with a maximum limit and a
minimum limit for the Pr2 measurement (P1-L).

The choices PrrG = P1-2 or = P1-L make the controller
operate as a differential controller.

In these cases the controller acts on the control outputs so it
keeps the difference Pr1-Pr2 equal to the Set Point value.

The difference between the two modes lies in the fact that
the P1-L mode activates a limit in the controller in terms of
the calculation of the temperature difference according to the
P2HL and P2LL parameters (both in the ]SP group) so that:

If Pr2 > P2HL the process value considered by the controller is
[Pr1-P2HL]

If Pr2 < P2HL the process value considered by the controller is
[Pr1-P2LL]

When P2HL and P2LL thresholds are exceeded by Pr2 tem­perature, a control takes place as if the Pr2 temperature is
the value of the limit regardless of the value actually read.

The aim of this function is to limit the differential regulation to
within a maximum range of the Pr2 measurement.

With the differential control the working mode Func = CooL
is used for applications with which the action of the actuator

reduces the Pr1-Pr2 difference (thus countering the Pr1-Pr2
difference that naturally tends to increase).

Viceversa the Func = HEAt mode is used for applications
with which the action of the actuator increases the Pr1-Pr2
difference thus countering the Pr1-Pr2 difference that natu­rally tends to decrease).

Obviously the Neutral Zone mode or the Double action
mode will set OFF both actions.

Temp.

Pr1

SP1

SP1

1.rEG

SP1 + HSEt

ON ON ON

Func = Cool

Pr2

Pr1- Pr2

HSEt

time

offoffoff

Example of differential ON/OFF control (On.FA) with
Func = CooL.

The controller is already programmed in production to
carry out differential regulation and display the tem-

m

perature difference Pr1 - Pr2.

5.4 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 pa­rameter Cont = On.FS or = On.FA and works on the output
programmed as 1.rEG, depending on the process value set
with PrrG, 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.

Cool

-

CooL

-

on.FA

HSEt

time

on.FS

HSEt
HSEt

SP

PV

OUT

1.rEG

SP

PV

OUT

1.rEG

HEAt - on.FA

HSEt

ON ON ON off offON ON ON

off off

HEAt - on.FS

HSEt
HSEt

off offON ON ON off offON ON ON

PV

SP

time

OUT

1.rEG

PV

SP

time time

OUT

1.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].

Viceversa, in case of direct action, or cooling (Func = CooL),
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 activated again when the
process value goes above value [SP + HSEt].

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 6

5.5 Neutral Zone ON/OFF Control (1.rEG - 2.rEG)

2

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 parameter
Cont = nr.

The Neutral Zone control is used to control plants in which
there is an element which causes a positive increase (e.g.
Heater, humidifier, etc.) and an element which causes a
negative increase (e.g. Cooler, de-humidifier, etc.).

The control functions work on the programmed outputs de­pending on the Process Value (PV), the active Set Point SP
and the HSEt hysteresis.

The control works in the following way: deactivates the out-
puts when the PV reaches the Set Point and it activates
the output 1.rEG when the PV goes below the [SP - HSEt]
value, or activates the output 2.rEG when the PV goes
above the [SP + HSEt] value.

Consequently, the element causing a positive increase
must be connected to the output programmed as 1.rEG
while the element causing a negative increase must be
connected to the output programmed as 2.rEG.

SP

Out 1.rEG
(heating)

Out 2.rEG
(cooling)

PV

ON

off

ON

ON

offoff

HSEt

HSEt

time

If 2.rEG output is used to control a compressor, it is possi­ble to use the “Compressor Protection” function that is used
to avoid compressor “short cycles”. This function allows a
time control on 2.rEG output activation, regardless of the
temperature control requests. The protection is a “delayed
after deactivation” type.

This protection avoids the output activation for a time
programmable at parameter CPdt (in seconds); the output
activation occurs only after the CPdt time has elapsed.

The CPdt protection time count starts from the last 2.rEG
output deactivation.

Obviously, whether during the time delay caused by the com­pressor protection function, the control request should stop, the
output activation foreseen after time CPdt would be erased.

The function is deactivated by programming CPdt = OFF.
The LED relative to 2.rEG output 2 blinks during the output ac-

tivation delay, caused by the “Compressor Protection” function.

5.6 Single Action PID Control (1.rEG)

All the parameters referring to PID control are in ]rEG group.
The Single Action PID control can be obtained by program-

ming parameter Cont = Pid and works on 1.rEG output depend­ing on: the active Set Point SP, the functioning mode Func and
on the instrument PID algorithm with 2 freedom degrees.

If the Out1 analogue output is present (0/4 ÷ 20 mA; 0/2 ÷ 10 V)
the output will operate as a regulation output providing a
value proportional to the regulation power calculated by the
instrument.

SP

Digital

OUT1

1.rEG

(HEat)

100%

Analogue

OUT1

1.rEG

(HEat)

0%

PV

ON ON ON ON ON ON ON

off off off off off off off

tcr1tcr1 tcr1 tcr1 tcr1 tcr1 tcr1

time

In presence of fast processes, in order to obtain a good PV
stability, the tcr1 cycle time must have a low value with a
very frequent intervention of the control output. In this case
we recommend to use a Solid State Relay (SSR) for driving
the actuator.

The Single Action PID control algorithm foresees the setting of
the following parameters

:

Pb Proportional Band;
tcr1 Cycle time of 1.rEG output;
Int Integral Time;
rS Manual Reset (only if Int = 0);
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.

SP

PV

1

3

time

1 FuoC Value OK;
2 FuoC Value too high;
3 FuoC Value too low.

5.7 Double Action PID Control (1.rEG - 2.rEG)

All the parameters referring to PID control are in ]rEG group.
Double Action PID control is used to control plants where

there is an element which causes a positive temperature in­creases (ex. Heating) and an element which causes a nega­tive temperature increases (ex. Cooling) and can be obtained
when 2 outputs are programmed respectively as 1.rEG and

2.rEG and setting Cont = Pid.
The element causing the positive increase must be con-

nected to the output programmed as 1.rEG while the element
causing the negative increase must 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 2 freedom degrees.

In presence of fast processes, in order to obtain a good Process
Variable stability, cycle times tcr1 and tcr2 must have a low
value with a very frequent intervention of the control outputs.

In this case we recommend to use Solid State Relays (SSR)
for driving the actuators.

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 7

The Double Action PID control algorithm needs the pro­gramming of the following parameters:

Pb Proportional Band;
tcr1 Cycle time of the output 1.rEG;
tcr2 Cycle time of the output 2.rEG;
Int Integral Time;
rS Manual Reset (only if Int = 0);
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.

When Prat = 0 the output 2.rEG is disabled and the

control behaves exactly as a single action PID con-

troller, through output 1.rEG.

5.8 Auto-tuning and Self-tuning Functions

All the parameters referring to the Auto-tuning and Self­tuning functions are contained in the group ]rEG.

The Auto-tuning and Self-tuning functions allow the auto­matic tuning of the PID variables.

Auto-tuning function provides the calculation of the PID
parameters through a Fast or Oscillatory type tuning cycle,

and, at the end of this operation, the parameters are stored in
the instrument memory and remain constant during control.

Self-tuning function (rule based “TUNE-IN”) instead executes
a control monitoring and the continuous calculation of
the parameters during control.

Both functions automatically calculate the following parameters:

Pb Proportional Band;
tcr1 Cycle time of the output 1.rEG;
Int Integral Time;
dEr Derivative Time;
FuoC Fuzzy Overshoot Control;

and, for the Double Action PID control, also:

tcr2 Cycle time of the output 2.rEG;
Prat Ratio between P 2.rEG/P 1.rEG.

5.8.1 How to activate Auto-tuning function

1 Program and activate the desired Set Point;
2 Set parameter Cont = Pid;
3 If Single Action control, set parameter Func according to

the process to be controlled through output 1.rEG;

4 Program an output as 2.rEG if the instrument controls the

plant with double action;

5 Program parameter Auto as:

1 If FAST Auto-tuning is desired to start automati-

cally all times the instrument is switched ON, on
the condition that the process value is
lower than [SP - |SP/2|] (when Func = HEAt) or
higher than [SP + |SP/2|] (when Func =CooL);

2 If FAST Auto-tuning is desired to start automati-

cally the next time the instrument is switched ON,

on the condition that the process value is lower than
[SP - |SP/2|] (with Func = HEAt) or higher than
[SP + |SP/2|] (with Func =CooL) and once the tun­ing is finished, the parameter Auto is automatically
switched to the OFF state;

3

If FAST Auto-tuning is to be manually started se-
lecting the parameter tune in the main menu or by
correctly programming the key as usrb = tune.

The Auto-tuning starts at the condition that the PV
is lower than [SP - |SP/5|] (with Func = HEAt) or
higher than [SP + |SP/5|] (with Func =CooL)

4 If FAST Auto-tuning is desired to start automati-

cally all times the Set Point is changed or at the
end of the programmed Softstart cycle.

The Auto-tuning starts anyway if PV is
lower than [SP - |SP/5|] (with Func = HEAt) or
higher than [SP + |SP/5|] (with Func =CooL);

-1

If OSCILLATORY Auto-tuning is desired to start auto-
matically all times the instrument is switched ON;

-2

If OSCILLATORY Auto-tuning is desired to start au-
tomatically the next time the instrument is switched
ON and once the tuning is finished, the parameter

Auto is automatically switched to the OFF state

-3

If OSCILLATORY Auto-tuning is to be manually
started using the key;

-4 If

Note: The Fast-type Auto-tuning is particularly quick and

In these cases it is advisable to use the Oscilla-

6 Exit from the parameter programming;
7 Connect the instrument to the controlled plant;
8 Activate the Autotune process by powering OFF and ON

the instrument if Auto = 1/2, or selecting the entry tunE
in the main menu (or using the key, when correctly
programmed) if Auto = 3, or changing the Set Point
value if Auto = 4.

At this point the Auto-tuning function is activated and is indi­cated by the flashing LED Tun.

The controller carries out several operations on the connect­ed plant in order to calculate the most suitable PID param­eters. If, at Auto-tuning start, the condition for the lower or
higher process value is not found the display will show ErAt
and the instrument will be swapped to normal control condi­tions according to the previously programmed parameters.
To make the error ErAt disappear, press key .

The Auto-tuning cycle duration has been limited to 12 hours­maximum. If Auto-tuning is not completed within 12 hours,

OSCILLATORY

automatically all times the Set Point is changed

or at the end of the programmed Softstart cycle.

shows no signs of having any effect on the control
as it calculates the parameters while reaching the
Set Point. For the correct execution of the Fast-type
Auto-tuning it is however necessary that at start-up
there is a certain difference between Process Varia-
ble and Set Point. For this reason the instrument only
activates the Fast Auto-tuning when:

– For Auto = 1/2: the Process Value is

lower than [SP - |SP/2|] (with Func = HEAt) or
higher than [SP + |SP/2|] (with Func = CooL);

– For Auto = 3/4: the Process Value is

lower than [SP - |SP/5|] (with Func = HEAt) or
higher than [SP + |SP/5|] (with Func = CooL).

FAST Auto-tuning is not indicated when the Set
Point is close to the initial reading or when the
variable measured varies in an irregular way dur-

ing the tuning cycle (for reasons due to the process,
the variable rises or decreases).

tory type Auto-tuning which implements some
ON/OFF regulation cycles that make the process
value oscillate around the Set Point values that

once finished pass to the PID type control with the
parameters calculated by the Auto-tuning;

Auto-tuning is desired to start

;

;

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 8

the instrument shows noAt on the display.

Auto Change Set Point

In case of probe error, the instrument automatically stops the
cycle in progress.

The values calculated by Auto-tuning are automatically
stored in the instrument memory at the end of the correct
PID parameters tuning.

5.8.2 How to activate Self-tuning function

1 Program and activate the desired Set Point;
2 Set parameter Cont = Pid;
3 If Single Action control, set parameter Func according to

the process to be controlled through output 1.rEG;

4 Program an output as 2.rEG if the instrument controls the

plant with double action or a time positioning servodrive;

5 Set parameter SELF = yES;
6 Exit from the parameter programming;
7 Connect the instrument to the controlled plant;
8 Activate Self-tuning selecting the entry tunE in the main

menu (or using the key, when correctly programmed) .

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 longer displayed.
To stop the Auto-tuning cycle or deactivate the Self-tuning

function select a different control type: rEG, oPLo or oFF
from the menu SEL. If the instrument is switched OFF during
Auto-tuning or with the Self-tuning function activated, these
functions will remain activated the next time it is switched ON.

5.9 Dynamic Set Point change and automatic

switching between two Set Points

(ramps an dwell time)

All parameters referring to the ramps functioning are con­tained in the group ]rEG.

It is possible to reach the Set Point in a predetermined time
(in any case longer than the time the plant would naturally
need). This could be useful in those processes (heating
or chemical treatments, etc.) where the Set Point must be
reached gradually or in a predetermined time.

Once the instrument has reached the first Set Point (SP1) it
is possible to switch automatically to the second Set Point
(SP2) after a set time, thus obtaining a simple automatic pro­cess cycle. These functions are available for all the program­mable controls (PID single and double action, ON/OFF and
Neutral Zone ON/OFF).

The function is determined by the following parameters:

SLor Gradient of first ramp expressed in unit/minute;
SLoF Gradient of second ramp expressed in unit/minute;
dur.t Dwell time of SP1 Set Point before automatic switching

to SP2 Set Point (expressed in hours and minutes).
The functions are deactivated when the relative parameters

are set to InF.
If is desired only one ramp (e.g. to reach SP1) it is enough to

program the parameter SLor with the desired value.
The ramp SLor will always be active at Power ON and

when the Active Set Point value is changed.
On the contrary, if an automatic cycle is to be executed at

Power ON, program nSP = 2, then the two Set Point values
SP1 and SP2 and naturally parameters SLor, dur.t and
SLoF with the desired values.

In this case at the end of the cycle all the ramps would not
be more active.

SP1

SP1

SP2

SLor

PV

Change SP1 Value

dur.t

SLor

PV

SLor

SP1

time [min]

SLoF

time [min]

Examples with starts from values lower than SP1 and with
decreasing of the Set Point.

Note: In case of PID control, if Auto-tuning is desired whilst

the ramp function is active, the ramp will not be car­ried out until the tuning cycle has been completed.
It is therefore recommended that Auto-tuning be start­ed avoiding activating the ramp function and, once
the tuning is finished, deactivate Auto-tuning (

oFF

), program the desired ramp and, if it automatic

Auto =

tuning is desired, enable the Self-tuning function.

5.10 Soft-start function

All parameters referring to the Soft -Start functioning are
contained in the group ]rEG.

The Soft-Start function only works through PID control
and allows the limitation of control power when the instru­ment is switched ON, for a programmable period of time.

This is useful when the actuator, driven by the instrument,
may be damaged by the excess of power supplied when the
application is not yet in the normal rating (e.g. for certain
heating elements).

The function depends on the following parameters:

St.P Soft-Start power;
SSt Soft-Start time (expressed in hh.mm);
HSEt End Soft Start cycle threshold.

If both parameters are programmed with values other than
OFF, when Powered ON the instrument gives the output
power set at parameter St.P for the time set at SSt or when
is reached the absolute value set at HSEt.

Practically, the instrument works in manual condition and
switches to automatic control at the elapsing of time SSt or
when is reached the absolute value programmed at param­eter HSEt.

To disable the Soft-Start function simply program: SSt = oFF.
Whenever a measurement error occurs during the Soft-Start

execution, the function is interrupted and the instrument gives
the output power programmed at parameter oPE. If the
measurement is restored, the Soft-Start remains deactivated.

To activate the Auto-tuning together with Soft-Start set:
Auto = 4/-4.

Auto-tuning starts automatically at the end of the pro­grammed Soft-Start cycle.

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 9

5.11 Alarms Output Functions (AL1, AL2, AL3)

AL1

For the alarms operation settings, the operation of which is relat­ed to the Process Value (AL1, AL2, AL3) it is first of all manda­tory to determine to which output the alarm must be addressed.

To obtain this, it is necessary to set, in the parameters group
]out, the parameters related to the output that is to be used
by each alarm (O1F, O2F, O3F, O4F):

ALno If the alarm output must be ON when the alarm is ac-

tive, while it is OFF when the alarm is not active;
ALnc If the alarm output must be ON when the alarm is not

active, while it is OFF when the alarm is active (the

LED on the display shows the alarm status);
ALni Same operation as ALnc, but with a reversed LED

indication (LED ON = Alarm OFF).
Note: All the examples that follow are referred to alarm AL1.

Obviously the functions of the other alarms are similar

(change 1 with 2 or 3).
Access at the group ]Al1 and program oAL1, to indicate

which output the alarm signal must to be sent.
The AL1 alarm functioning is instead defined by parameters:

PrA1 Which Process Value must be used by AL1;
AL1t Alarm type;
Ab1 Alarm configuration;
AL1 Alarm threshold;
AL1L Low alarm threshold (for band alarm) or minimum Set

Point of AL1 alarm threshold (for low or high alarm);
AL1H High alarm threshold (for band alarm) or maximum Set

Point of AL1 alarm threshold (for low or high alarm);

HAL1 Alarm AL1 Hysteresis;
AL1d Alarm activation delay (in seconds);
AL1i Alarm behaviour in case of measurement error.

PrA1 - Alarm process measurement

Through this parameter it is possible to set the Process Vari­able used by the alarm for operating. In fact the alarm can
operate considering the process variable as the value meas­ured by Input 1 (Pr1), the value measured by Input 2 (Pr2),
the difference between the two inputs Pr1-Pr2 (P1-2) or can
consider the difference between the two inputs Pr1-Pr2 but
with a maximum limit and a minimum limit for the Pr2 meas­urement Pr2 (P1-L).

AL1t - Alarm Type

The alarm output can behave in six different ways:

– LoAb = Absolute low alarm: The alarm is activated when

the PV goes below the alarm threshold set at parameter
AL1 and deactivated when the PV goes above the value
[AL1 + HAL1]. With this mode is possible to program, with
AL1L and AL1H parameters, the minimum and the maxi­mum limits of AL1 thresholds.

– HiAb = Absolute high alarm:

The alarm is activated when the PV goes above the alarm
threshold set at parameter AL1 and is deactivated when
thePV goes below the value [AL1 - HAL1]. In this way is
possible to program, with AL1L and AL1H parameters, the
minimum and the maximum limits of AL1 thresholds.

AL1

OUT
AL1

PV

HiAb

HAL1

time

offoffoffON ON ON ON

AL1

OUT

PV

LoAb

HAL1

time

offoffoff

– LodE =

Deviation low alarm: The alarm is activated when
the process value goes below the value [SP + AL1] and is
deactivated when it goes above the value [SP + AL1 + HAL1].

In this way is possible to program, with AL1L and AL1H param­eters, the minimum and the maximum limits of AL1 thresholds.

– HidE = Deviation high alarm: The alarm is activated when

the process value goes above the value [SP + AL1] and is
deactivated when it goes below the value [SP + AL1 + HAL1].
In this way is possible to program, with AL1L and AL1H param­eters, the minimum and the maximum limits of AL1 thresholds.

AL1

SP

OUT
AL1

PV

Hide

HAL1

time

offoffoff

SP

-AL1

OUT
AL1

PV

Lode

HAL1

time

ON ON ON ON

offoffoff

– LHAb = Absolute band alarm: The alarm is activated

when the PV goes under the alarm threshold set at pa­rameter AL1L or goes above the alarm threshold set with
parameter AL1H and is deactivated when the PV returns
inside the range [AL1H - HAL1 ÷ AL1L + HAL1].

– LHdE = Deviation band alarm: The alarm is activated

when the PV goes below the value [SP + AL1L] or above
the value

[SP + AL1H]

and is deactivated when the PV
goes outside the range
[SP + AL1H - HAL1 ÷ SP + AL1L + HAL1].

PV

AL1H

AL1L

OUT
AL1

LHAb

ON ON ON ON

HAL1

HAL1

time

offoffoff

AL1H

SP

-AL1L

OUT
AL1

PV

LHde

HAL1

HAL1

time

offoffoff

Ab1 - Alarm configuration

This parameter can assume a value between 0 and 64.
The number to be set, which will correspond to the function
desired, is obtained by adding the values reported in the fol­lowing descriptions:

Alarm behaviour at power ON
the alarm output may behave in 2 different ways, depending
on the value added to parameter Ab1.

+0 Normal behaviour: The alarm is always activated when

there are alarm conditions.

+1 Alarm not activated at Power ON: If, at power ON, the

instrument is in alarm condition, the alarm is not activated.
The alarm will be activated only when the Process Palue,
after Power ON, has not been brought into the non-alarm
conditions and subsequently in the alarm conditions.

PV

AL1

time

Ab1 = +0

Ab1 = +1

ON ON

ON

Example with absolute low alarm.
Alarm delay

The alarm output may behave in 2 different ways depending
on the value added to parameter Ab1.

+0 Alarm not delayed: The alarm is immediately activated

when the alarm condition occurs.

+2 Alarm delayed: When the alarm condition occurs, delay

counting begins, as programmed at parameter AL1d
(expressed in seconds) and the alarm will be activated

offoff

offoff

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 10

only after that time has elapsed.

PV

AL1

time

Ab1 = +0

Ab1 = +2

ON

ON

AL1d AL1d

ON

ON

offoff

offoffoff

Example with absolute low alarm.
Latched alarm

The alarm output may behave in 2 different ways depending
on the value added to parameter Ab1.

+0 Alarm not latched: The alarm remains active in alarm

conditions only.

+4

Latched alarm: The alarm is active in alarm conditions and

remains active even when these conditions no longer exist,
until the correctly programmed key , (USrb = Aac) is
pressed or is closed the Digital Input (diF = Aac).

PV

AL1

time

Ab1 = +0

Ab1 = +4

ON ON

ON ON

offoff

offoff

or Digital Input

Example with absolute high alarm.
Alarm acknowledgement

The alarm output may behave in 2 different ways depending
on the value added to parameter Ab1.

+0 Alarm not acknowledged: The alarm remains active in

alarm conditions only.

+8

Alarm acknowledged: The alarm is active in alarm condi­tions and can be deactivated pressing the key (if prop­erly programmed: USrb = ASi) or is closed the Digital Input
(diF = Aac) also if the alarm conditions are still present.

PV

AL1

time

Ab1 = +0

Ab1 = +8

ON

ON ON

offoff

offoff

or Dig. Input or Dig. Input

ON

off

off

Example with absolute high alarm.
Alarm behaviour at Set Point change (deviation alarms only)

the alarm output may behave in 2 different ways, depending
on the value added to parameter Ab1.

+0 Normal behaviour: The alarm is always activated when

there are alarm conditions.

+16 Alarm not activated at Set Point change: In case of a Set

Point change, if the instrument is in alarm condition, the
alarm is not activated. The alarm will be activated only
when the process value, after Set Point change, has not
been brought into the non-alarm conditions and subse­quently in the alarm conditions.

Control output shutdown whith alarm active

There are 2 different alarm output behaviors, depending on
the value added to Ab1.

+0 Normal behavior: The alarm does not affect the control

output.

+32 Control output shutdown when the alarm is triggered:

When the instrument detects the activation of the alarm
status, disables the control output. The output is reac­tivated on the basis of the previously selected alarm
options (acknowledgment of alarms, etc.).

AL1i -

Alarm activation in case of measurement error

This parameter allows to establish how the alarm must be­have in the event of a measurement error:

yES Alarm active;
no Alarm deactivated.

5.12 Loop Break Alarm Function

All the parameters referring to the Loop Break alarm function
are contained in the group ]LbA.

The Loop Break alarm is available on all the instruments,
which intervenes when, for any reason (short-circuit of a
thermocouple, thermocouple inversion, load interruption),
the loop control is interrupted.

First of all, it is necessary to establish to which output the
alarm must be addressed.

To do this it is necessary to set, in the group ]out, the param­eter relative to the output to be used (o1F, o2F, o3F, o4F)
programming the parameters as:

ALno If the alarm output must be ON when the alarm is ac-

tive while it is OFF when the alarm is not active;

ALnc If the alarm output must be OFF when the alarm is

active while it is ON when the alarm is not active;

ALni

The same behaviour as

ALnc

but with a reversed LED

indication (the LED indicates the output status).

Enter group ]Lba and program, with parameter oLbA, to
which output the alarm signal must be addressed.

The Loop Break alarm is activated if the output power
remains at the 100% for the time programmed at parameter
LbAt (expressed in s).

To avoid unwanted alarms, the value of this parameter must
be set considering the time the plant takes to reach the Set
Point when the measured value is far from it (for example at
plant start-up).

When the alarm is triggered, the instrument displays the
message LbA and behaves as in the case of a measurement
error giving a power output as programmed with parameter
OPE (group ]InP).

To restore normal functioning after the alarm intervention,
select the control mode oFF and then reprogram the auto­matic control (rEG) after checking the correct functioning of
probe and actuator.

In order to exclude the Loop Break alarm, set:
OLbA OFF.

5.13 Functioning of Key

In addition to the normal display function of Pr1, Pr2 and
P1 - 2, the key can be programmed to perform other func-

tions using the USrb parameter contained in the ]PAn group.
The parameter USrb can be programmed as:

noF No function;
tunE

Pressing the key for at least 1 s, is possible to activate/
deactivate Auto-tuning or Self-tuning (if programmed)

oPLo

Pressing the key for at least 1 s
from automatic control (rEG) to manual one (oPLo)
and vice-versa;

Aac

Pressing the key for at least 1 s
edge the alarm (paragraph 5.11);

ASi

Pressing the key for at least 1 s
edge an active alarm (paragraph 5.11);

CHSP

Pressing the key for at least 1 s

, it is possible to swap

, is possible to acknowl-

, is possible to acknowl-

, is possible to select,

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 11

sequentially, one of the 2 pre-programmed Set Points;

oFF

Pressing the key for at least 1 s

, is possible to swap
between automatic control (rEG) to OFF control (oFF)
and vice-versa.

5.14 Digital Input

The instrument can be equipped with 2 digital inputs that are
managed by 1 parameter .

The function of the digital input can be set through param­eter diF contained in the group ]InP.

The parameter can diF be programmed as:

noF No function;
Aac

Closing the contact connected to digital input 1
sible to acknowledge the alarm (paragraph 5.11);

ASi

Closing the contact connected to digital input 1 is pos­sible to acknowledge an active alarm (paragraph 5.11);

HoLd Closing the contact connected to digital input 1 the

istrument holds the measure in that instant (m not
the reading on the display, therefore the indication
could settle with a delay proportional to the measure
filter). With the hold function activated, the instrument
operates the control according to the stored measure.
Opening the contact, the instrument returns to the
normal acquisition of the measure;

oFF When the instrument is in rEG state, closing the

contact connected to digital input 1, the instrument is
placed in oFF status. Opening the contact, the instru­ment returns to the rEG automatic control status;

CHSP

Closing the contact connected to digital input 1
sible to select, sequentially, one of the 2 pre-pro­grammed Set Points;

SP1.2 Closing the contact connected to digital input 1 is pos-

sible to select as active the SP2 Set Point. Opening
the contact the SP1 Set Point is selected as active.
SP1.2 can be selected only when nSP = 2 and, when
active, it disables the selection of the active Set Point
through the parameter SPAt and through the key;

HE.Co Closing the contact connected to digital input 1 is

possible to select as active the Set Point SP2 in CooL
mode. Opening the contact the SP1 Set Point is se­lected as active in HEAt mode. HE.Co can be selected
only when nSP = 2 and, when active, it disables the
selection of the active Set Point through the parameter
SPAt and through the key.

is pos-

is pos-

5.15 RS485 Serial Interface

The instrument can be equipped with a RS485 serial com­munications interface, by means of which it is possible to
connect the controller to a network to which other instru­ments (PLC controllers) are connected. All these devices
typically depend on a Personal Computer that acts as a
plant supervisor. Using a Personal Computer is possible to
acquire all the function information and to program all the
instrument configuration parameters. The software protocol
adopted for K31D is a MODBUS RTU type, widely used in
several PLC and supervision programs available on the mar­ket (the manual of the comminications protocol of the K31D
series 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 120W resistance (Rt)
must be connected to the end of the line.

The instrument has two terminals called A and B that must
be connected to all network terminals with the same label.

For wiring the line, then a twisted pair of telephone type is
sufficient.

However, especially when the network is very long or dis­turbed, it is advisable to adopt a 3-pole wired and shielded
cable connected as shown.

If the instrument is equipped with a serial interface, the pa­rameters to be programmed are the following, all present in
the parameters group ]SEr:

Add Address of the station. Set a different number for each

station. Values: 1 ÷ 255.

baud Transmission speed (baud-rate). Values:1200 ÷ 38400

baud. All the stations on the line must have the same
transmission speed.

PACS Programming access. If programmed as LoCL it

means that the instrument is only programmable from
the keyboard, if programmed as LorE it is programma­ble both from the keyboard and serial line.

If an attempt is made to enter the programming from the
keyboard whilst a communication through the serial port
is in progress the instrument shows the message buSy
to indicate the busy state.

Host

(OP/PC/PLC)

A

B

GND

RS485

Interface

A GNDB

10

9 8

K31D no. 1

Shield

A GNDB

10 9 8

K31D no. 2

Rt

120Ω

A GNDB

10 9 8

K31D no. 31

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 12

6. ACCESSORIES

The instrument has a lateral socket into which a special tool
can be inserted.

6.1 Parameters configuration by “A01”

The instrument is equipped with a 5 poles connector that
allows the transfer from and toward the instrument of the
functioning parameters through the device A01.

This device it is mainly usable for the serial programming of
some instruments which need to have the same parameters
configuration or to keep a copy of the parameters setting of
an instrument and allow its rapid retransmission.

The same device allows to connect a PC via USB with which,
through the appropriate configuration software for “AT Univer-
salConf” tool, the operating parameters can be configured.

To use the A01 device it is necessary that the device or
instrument are being supplied.

Power supply

A B C

Enter

TTL

USB

PWS

12 V

+-

USB

to PC

Supply adapter

12 V

+-

USB

to PC

PWS

AC supply

Enter

A B C

TTL

12 VDC

USB

Note: For instruments equipped with an RS485 serial com-

munication port, it is essential that PAcS = LorE.

For additional info, please have a look at the A01 instruction
manual.

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 13

7. PROGRAMMABLE PARAMETERS

Hereafter is inserted a description of all the parameters available on the instrument. Some of them may not be present,
either due to the fact they depend on the type of instrument or because they are automatically disabled as unnecessary.

Group ]sp Set Point Parameters

Parameter Description Range Default Note

1

nSP

2

SPAt

3

SP1

4

SP2

5

P2HL

6

P2LL

7

SPLL

8

SPHL

Number of the programmable Set Points 1 ÷ 2 1
Active Set Point 1 ÷ nSP 1
Set Point 1 SPLL ÷ SPHL 0
Set Point 2 SPLL ÷ SPHL 0
Upper Pr2 measurement limit for differential control -1999 ÷ 9999 9999
Lower Pr2 measurement limit for differential control -1999 ÷ 9999 -1999
Low Set Point -1999 ÷ SPHL -1999
High Set Point SPLL ÷ 9999 9999

Group ]InP Measure Input Parameters

Parameter Description Range Default Note

Ptc PTC

9

10

11

12

13

14

15

16

17

18

19

20

SEnS

Pr2

dP

Aot

Unit

FiL

oFS1

oFS2

rot

InE

oPE

dIF

Probes type

Probe Pr2 presence

Number of decimal figures 0/1 0

Analogue control Output type

Temperature unit of measurement °C/°F °C

Input digital filter

Measuring Offset Pr1 -1999 ÷ 9999 0
Measuring Offset Pr2 -1999 ÷ 9999 0
Rotation of the measuruing straigìht line 0.000 ÷ 2.000 1.000

oPE functioning in case of measuring error

Output power in case of measuring error -100 ÷ 100% 0

Digital inputs function

ntc NTC
Pt10 Pt1000

yES
no

0-20 0 ÷ 20mA
4-20 4 ÷ 20 mA
0-10 0 ÷ 10 V
2-10 0 ÷ 10 V

oFF Not active

0.1 ÷ 20.0 s

or Overrange
Ur Under range
our Overrange and underrange

noF No Function
Aac Reset Alarms latch
ASi Acknowledged Alarms
HoLd Hold Measure
oFF Control OFF
CHSP Sequential Set Point selection
SP1.2 SP1 or SP2 Set Point selection
HE.Co Select HEAt with SP1 or CooL with SP2

ntc

yES

0-10

1.0

our

noF

Group ]Out Outputs Parameters

Parameter Description Range Default Note

21

22

23

24

O1F

O2F

O3F

O4F

Output 1 function

Output 2 function ALno

Output 3 function ALno

Output 4 function ALno

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 14

1.rEG Control output 1

2.rEG Control output 2
ALno Alarm Output NO
ALnc Alarm Output NC
ALni Alarm Output NC with reversed LED functioning

1.rEG

Group ]AL1 AL1 Alarm Parameters

Parameter Description Range Default Note

25

26

27

28

29

30

31

32

33

34

OAL1

PrA1

AL1t

Ab1

AL1

AL1L

AL1H

HAL1

AL1d

AL1i

Output where alarm AL1 is addressed

AL1 Alarm PV reference Pr1/Pr2/P1-2/P1-L Pr1

AL1 Alarm type

AL1 Alarm functioning

AL1 Alarm threshold AL1L ÷ AL1H 0
Low threshold band alarm AL1 or Minimum

set alarm AL1 for high or low alarm
High threshold band alarm AL1 or Maximum

set alarm AL1 for high or low alarm

AL1 Alarm hysteresis

AL1 Alarm activation delay

Alarm AL1 activation in case of probe error no/yES no

oFF Not active
Out1/Out2 Out3/Out4

Out2

LoAb Absolute Low
HiAb Absolute High
LHAb Absolute Band
LodE Deviation Low

LoAb

HidE Deviation High
LHdE Deviation Band

0 ÷ 64
+1 Not active at power ON
+2 Delayed alarm
+4 Latched alarm

0
+8 Acknowledgeable
+16 Not active at Set Point change (relative alarms)
+32 Control Output shutdown at alarm intervention

-1999 ÷ AL1H -1999

AL1L ÷ 9999 9999

oFF Not active
1 ÷ 9999

oFF Not active
1 ÷ 9999 s

1

OFF

Group ]AL2 AL2 Alarm Parameters

Parameter Description Range Default Note

35

36

37

38

39

40

41

42

43

44

OAL2

PrA2

AL2t

Ab2

AL2

AL2L

AL2H

HAL2

AL2d

AL2i

Output where alarm AL2 is addressed

AL2 Alarm PV reference Pr1/Pr2/P1-2/P1-L Pr1

AL2 Alarm type

AL2 Alarm functioning

AL2 Alarm threshold AL2L ÷ AL2H 0
Low threshold band alarm AL2 or Minimum

set alarm AL2 for high or low alarm
High threshold band alarm AL2 or Maximum

set alarm AL2 for high or low alarm

AL2 Alarm hysteresis

AL2 Alarm activation delay

Alarm AL2 activation in case of probe error no/yES no

oFF Not active
Out1/Out2 Out3/Out4

oFF

LoAb Absolute Low
HiAb Absolute High
LHAb Absolute Band
LodE Deviation Low

LoAb

HidE Deviation High
LHdE Deviation Band

0 ÷ 64
+1 Not active at power ON
+2 Delayed alarm
+4 Latched alarm

0
+8 Acknowledgeable
+16 Not active at Set Point change (relative alarms)
+32 Control Output shutdown at alarm intervention

-1999 ÷ AL2H -1999

AL2L ÷ 9999 9999

oFF Not active
1 ÷ 9999

oFF Not active
1 ÷ 9999 s

1

oFF

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 15

Group ]AL3 AL3 Alarm Parameters

Parameter Description Range Default Note

45

46

47

48

49

50

51

52

53

54

OAL3

PrA3

AL3t

Ab3

AL3

AL3L

AL3H

HAL3

AL3d

AL3i

Output where alarm AL3 is addressed

AL3 Alarm PV reference Pr1/Pr2/P1-2/P1-L Pr1

AL3 Alarm type

AL3 Alarm functioning

AL3 Alarm threshold AL3L ÷ AL3H 0
Low threshold band alarm AL3 or Minimum

set alarm AL3 for high or low alarm
High threshold band alarm AL3 or Maximum

set alarm AL3 for high or low alarm

AL3 Alarm hysteresis

AL3 Alarm activation delay

Alarm AL3 activation in case of probe error no/yES no

oFF Not active
Out1/Out2 Out3/Out4

Out2

LoAb Absolute Low
HiAb Absolute High
LHAb Absolute Band
LodE Deviation Low

LoAb

HidE Deviation High
LHdE Deviation Band

0 ÷ 64
+1 Not active at power ON
+2 Delayed alarm
+4 Latched alarm

0
+8 Acknowledgeable
+16 Not active at Set Point change (relative alarms)
+32 Control Output shutdown at alarm intervention

-1999 ÷ AL3H -1999

AL3L ÷ 9999 9999

oFF Not active
1 ÷ 9999

oFF Not active
1 ÷ 9999 s

1

OFF

Group ]lba Loop Break Alarm Parameters

Parameter Description Range Default Note

55

56

OLbA

LbAt

Output where LbA alarm is addressed

Time necessary to activate alarm LbA

oFF Not active
Out1/Out2 /Out3/Out4

oFF Not active
0 ÷ 9999 s

OFF

OFF

Group ]reg Control Parameters

Parameter Description Range Default Note

Pid PID

57

58

59

60

61

62

63

64

65

66

67

68

Cont

Func

PrrG

HSEt

CPdt

Auto

SELF

Pb

Int

dEr

FuOc

tcr1

Control type

Functioning mode output 1.rEG

Control process measurement reference Pr1/Pr2/P1-2/P1-L Pr1
Hysteresis of ON/OFF control (or end Soft

Start cycle threshold)

Compressor Protection time for 2.rEG

Auto-tuning enable:
1, 2, 3, 4 For Fast Auto-tuning

-1, -2, -3, -4 For Oscillatory Auto-tuning

Self-tuning enable no/yES no
Proportional band 0 ÷ 9999 50

Integral time

Derivative time

Fuzzy overshoot control 0.00 ÷ 2.00 0.5
Cycle time of output 1.rEg 0.1 ÷ 130.0 s 20.0/1.0

on.FA Asymmetrical ON/OFF
on.FS Symmetrical ON/OFF
nr Neutral zone ON/OFF

HEAt Heating
CooL Cooling

0 ÷ 9999 1

oFF Not active
0 ÷ 9999 s

oFF Not active
1 Start at each power ON
2 Start at first power ON
3 Start manually
4 Start after a Soft Start or a Set Point change

oFF Not active
0 ÷ 9999 s

oFF Not active
0 ÷ 9999 s

Pid

HEAt

0

0

200

50

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 16

Parameter Description Range Default Note

69

70

71

72

73

74

75

Prat

tcr2

rS

SLor

dur.t

SLoF

St.P

Power ratio 2.rEg/1.rEg 0.01 ÷ 99.99 1.00
Cycle time of 2.rEg 0.1 ÷ 130.0 s 10.0
Manual reset -100.0 ÷ 100.0% 0.0

Gradient of first ramp

Duration time between 2 ramp

Gradient of second ramp

inF Ramp not active

0.00 ÷ 99.99 units/min
inF Time not active

0.00 ÷ 99.59 h.min
inF Ramp not active

0.00 ÷ 99.99 units/min

InF

InF

InF

Soft-Start power -100 ÷ 100% 0

oFF Not active

76

SSt

Soft-Start time

0.1÷7.59 h.min

oFF

InF Endless

Group ]PAn User interface Parameters

Parameter Description Range Default Note

noF No function
tune Autotune/Selftune start
oPLo Manual operation (open loop)

77

78

79

80

81

USrb

diSP

AdE

Edit

PASS

Funtion recalled by the key

Displayed Variable

Shift value for the shift index functioning

Fast programming Active Set Points and
Alarms

Password to access ConF menu

Aac Reset Alarm memory
ASi Alarms Acknowledge
CHSP Active Set Point selection
oFF Control in OFF mode

Pr1 Pr1 Value
Pr2 Pr2 Value
P1-2 Pr1-Pr2 Value
Pou Control Power
SP.F Active Set Point Value
SP.o Operative Set Point value
AL1 AL1 threshold
AL2 AL2 threshold
AL3 AL3 threshold

0 OFF
1 ÷ 9999

SE

Set Points changeable, Alarms not changeable

AE A
SAE A
SAnE A

larms changeable, Set Points not changeable
larms and Set Points changeable
larms and Set Points not changeable

oFF Not active
0 ÷ 9999

noF

P1-2

2

SAE

oFF

Group ]sEr Serial Communications Parameters

Parameter Description Range Default Note

82

83

84

Add

baud

PACS

Station address in case of serial communi­cation

0 ÷ 255 1

Transmissions speed (Baud rate) 1200/2400/9600/19.2/38.4 9600

LoCL No (programmable only with the keyboard)

Programmability through serial port

LorE Yes (programmable with the keyboard and

LorE

from serial port)

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 17

8. PROBLEMS, MAINTENANCE AND WARRANTY

9. TECHNICAL DATA

8.1 Probe errors

Error Reason Action

E1-E1

E2-E2

----

The probe Pr1 may be interrupted
or in short circuit, or may measure a
value outside the allowed range

The probe Pr2 may be interrupted
or in short circuit, or may measure a
value outside the allowed range

Process measurement not available

Check the correct
connection of the
probe with the in­strument and check
the probe works
correctly

8.2 Other errors

Error Reason Action

ErAt

noAt

LbA

ErEP

Auto-tuning not pos­sible because the
process value is too
high or too low

Auto-tuning not fin­ished within 12 hours

Loop control interrupt­ed (Loop break alarm)

Possible EEPROM
memory anomaly

Press the keyin order to make
the error message disappear.
Once the error has been found,
try to repeat the auto-tuning

Check the the probe and actuator
functioning and try to repeat the
auto-tuning

Check the the probe and actuator
functioning and swap the instru­ment to (rEG) control

Press the key

In error conditions, the instrument provides the output power
programmed with parameter oPE and activates the desired
alarm(s), if the relative parameters ALni have been pro­grammed as yES.

8.3 Cleaning

We recommend cleaning of the instrument with a slightly
wet cloth using water and not abrasive cleaners or solvents
which may damage the instrument.

9.1 Electrical characteristics

Power supply: 12 VAC/VDC, 24 VAC/VDC, 100 ÷ 240 VAC

± 10%;

Frequency AC: 50/60 Hz;
Power consumption: about 4 VA;
Inputs: 2 inputs for temperature probes:

NTC (103AT-2,
PTC (KTY 81-121, 990W @ 25°C) or
Pt1000
+ 2 free voltage digital inputs contacts;

Outputs: Up to 4 relay or Vdc for SSR outputs:

Out1 - SPDT - 8A ­1/2HP 250 V

Out2 - SPDT - 8A ­1/2HP 250 V

Out3 - SPST-NO - 5A ­1/10HP 125/250 V

Out4 - SPST-NO - 5A ­1/10HP 125/250V

Relay outputs slectrical life as for EN 60730:
Out1, Out2: 100000 operations; Out3, Out4: 100000 operations

Installation category: II;
Measurement category: I;
Protection class against electric shock:

Class II for Front panel;
Insulation: Reinforced insulation between the low voltage

section (relay outputs) and the front panel; Reinforced insula­tion between the low voltage section (relay outputs) and the
extra low voltage section (inputs, SSR outputs); No insulation
between power supply, inputs and SSR outputs; 50 V insula­tion between RS485 and extra low voltage section.

10 kW @ 25°C) or

EN 61810 EN 60730 UL 60730

8 (3) A 4 (4) A 10 A Res.

8 (3) A 4 (4) A 10 A Res.

5 (1) A 2 (1) A 2 A Gen. Use

5 (1) A 2 (1) A 2 A Gen.Use

;

8.4 Warranty and Repairs

The instrument is under warranty against manufacturing
flaws or faulty material, that are found within 18 months from
delivery date.

The warranty is limited to repairs or to the replacement of the
instrument. The eventual opening of the housing, the viola­tion of the instrument or the improper use and installation of
the product will bring about the immediate withdrawal of the
warranty effects.

In the event of a faulty instrument, either within the period
of warranty, or further to its expiry, please contact our sales
department to obtain authorisation for sending the instru­ment to our company. The faulty product must be shipped
to Ascon Tecnologic with a detailed description of the faults
found, without any fees or charge for Ascon Tecnologic,
except in the event of different agreements.

8.5 Disposal

The appliance (or the product) must be disposed
of separately in compliance with the local standards
in force on waste disposal.

9.2 Mechanical characteristics

Housing: Self-extinguishing plastic, UL 94 V0;
Heat and fire resistance category: D;
Dimensions: 78 x 35 mm, depth 75.5 mm;
Weight: about 150 g;
Mounting: Incorporated flush in panel (pane thickness

12 max. mm) in a 71 x 29 mm hole;
Connections: Fixed or removable screw terminal block for

0.2 ÷ 2.5 mm2/AWG 24 ÷ 14 cables;
Protection degree: IP65 (NEMA 3S) when mounted with

the optional screw type bracket;

Pollution degree: 2;
Operating temperature: 0 ÷ 50°C;
Operating humidity: < 95 RH% with no condensation;
Storage temperature: -10 ÷ +60°C.

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 18

9.3 Functional Features

10. HOW TO ORDER

Control: ON/OFF, Neutral zone, single and double action PID;
Measurement range:

Probe type dP = 0 dP = 1

PTC (KTY81-121) SEnS = Ptc

NTC (103-AT2) SEnS = ntc

Pt1000 SEnS = Pt10

-55 ÷ +150°C

-67 ÷ +302°F

-50 ÷ +110°C

-58 ÷ +230°F

-50 ÷ +350°C

-58 ÷ +662°F

-55.0 ÷ +150.0°C

-67.0 ÷ +302.0°F

-50.0 ÷ +110.0°C

-58.0 ÷ +230.0°F

-50.0 ÷ +350.0°C

-58.0 ÷ +662.0°F

Display resolution: According to the probe used 1°/0.1°;
Overall accuracy: ±(0.5% fs + 1 digit);
Sampling rate: 130 ms;
Serial Interface: Isolated RS485;
Communications protocol: MODBUS RTU (JBUS);
Baud rate: Between 1200

÷

38400 baud;

Display: 4 Digit Red h 12 mm;
Compliance: ECC directive EMC 2004/108/CE (EN 61326),

ECC directive LV 2006/95/CE (EN 61010-1).

Model
K31D = Instrument with mechanical keys

a: Power supply
H = 100... 240 VAC
L = 24 VAC/DC
F = 12 VAC/DC

b: Inputs
2 = For PTC, NTC Thermistors or

Pt1000 resistance thermometer

c: Output 1 (Out1)
R = Relay SPDT 8A (resistive load)
O = Vdc for SSR

I = Analogue Output 0/4...20 mA; 0/2...10 V
(only with L tye power supply and without RS485)

d: Output 2 (Out2)
R = Relay SPDT 8A (resistive load)

Vdc for SSR

O =

- = Not present

e: Output 3 (Out3)
R = Relay SPST-NO 5A (resistive load)

Vdc for SSR

O =

- = Not present

f: Output 4 (Out4)
R = Relay SPST-NO 5A (resistive load)

Vdc for SSR

O =

- = Not present

g: Communications Interface

RS 485 Serial interface

S =

- = Not present

h: Connector Terminals

- = Screw terminals (standard)
E = Removable socket with screw

terminals

caK31D b-e- -hi ll mmj

k

Note: To order the screw type bracket necessary to obtain

the IP65 protection degree, contact our sales offices.

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 19

Ascon Tecnologic - K31D - OPERATING INSTRUCTIONS - PAG. 20