Sitec TRG 72x72 User manual

SITEC S.r.l. Industrial electronics –www.sitecsrl.it
User Manual TRG 72x72 R2.A Pag. 1
USER MANUAL
72X72
TRG 72 x 72
Thermoregulator for ovens

SITEC S.r.l. Industrial electronics –www.sitecsrl.it
User Manual TRG 72x72 R2.A Pag. 3
SUMMARY
1.0 INTRODUCTION .................................................................................................................................................... 5
1.1 INTRODUCTION.............................................................................................................................................................. 5
1.2 APPLICATIONS ............................................................................................................................................................... 5
1.3 FRONT LAYOUT OF THE THERMOREGULATOR........................................................................................................................ 6
1.4LAYOUT WITH THE THERMOREGULATOR DIMENSIONS ............................................................................................................ 6
2.0 INSTALLATION AND TESTING ................................................................................................................................ 7
2.1 ASSEMBLY .................................................................................................................................................................... 7
2.2 TERMINAL BOXES AND CONNECTION ELECTRICAL SCHEME ....................................................................................................... 7
2.3 WIRING AND ELECTRICAL CONNECTIONS ............................................................................................................................. 8
2.4 SWITCHING ON AND SWITCHING OFF....................................................................................................................... 8
2.5 INSTALLATION AND TESTING .......................................................................................................................................... 8
3.0 TECHNICAL SPECIFICATIONS.................................................................................................................................. 9
3.1 SUMMARY TABLE WITH TECHNICAL SPECIFICATIONS ............................................................................................................... 9
MECHANICAL .............................................................................................................................................................. 9
ELECTRICAL ................................................................................................................................................................. 9
OUTPUTS (K1 –K2) ..................................................................................................................................................... 9
ENVIRONMENTAL ....................................................................................................................................................... 9
3.2 FACTORY SETTINGS ....................................................................................................................................................... 10
4.0 CONFIGURATION MENU ......................................................................................................................................11
4.1 MENU CONFIGURATION KEYS ......................................................................................................................................... 11
4.2 HOW TO ENTER-EXIT-SURF THE CONFIGURATION MENU ....................................................................................................... 11
4.3 MENU HIERARCHICAL SCHEME ........................................................................................................................................ 12
5.0 SETTING PARAMETERS.........................................................................................................................................13
5.1 SET THE SETPOINT TEMPERATURE .................................................................................................................................... 13
5.2 CHANGE THE TEMPERATURE PROBE ................................................................................................................................. 13
5.2.1 - Operational range of the temperature probes: ............................................................................................. 13
5.3 CHANGE THE TYPE OF SETTING ........................................................................................................................................ 14
5.3.1 - On/Off Setting................................................................................................................................................ 14
5.3.2 - PID Setting ..................................................................................................................................................... 14
5.4 HYSTERESIS................................................................................................................................................................. 15
5.5 TEMPERATURE TO ENABLE THE SECOND HEATER ................................................................................................................. 16
5.6 CONTROL AREA............................................................................................................................................................ 17
5.7 PROPORTIONAL BAND ................................................................................................................................................... 18
5.8 INTEGRAL TIME ............................................................................................................................................................ 19
5.9 DERIVATIVE TIME ......................................................................................................................................................... 20
5.10 PERIOD OF THE PWM SIGNAL ...................................................................................................................................... 21
5.11 MINIMUM TIME TO REACTIVATE THE OUTPUTS................................................................................................................. 21
6.0 ERRORS ................................................................................................................................................................22
6.1 ERROR CODES AND POSSIBLE SOLUTIONS........................................................................................................................... 22

SITEC S.r.l. Industrial electronics –www.sitecsrl.it
User Manual TRG 72x72 R2.A Pag. 5
1.0 INTRODUCTION
1.1 INTRODUCTION
The TRG 72x72 model is a digital microprocessor thermoregulator, with ON/OFF setting or single action PID
(with single heater/heaters), with the possibility to set the following parameters:
With ON/OFF setting:
Hysteresis (symmetrical or asymmetrical)
Control zone
Temperature to enable the second heater
Minimum time to restart the heater/heaters
Instead, with the PID setting (single action), you can set the following parameters:
Proportional band
Integral time
Derivative time
Period of the output PWM signal
In addition, three different kinds of temperature probes are supported, and they can be selected through the
thermoregulator menu:
Thermocouple K
Thermocouple J
PT100
1.2 APPLICATIONS
The thermoregulator can be used for the following applications:
To set the temperature of a single-action oven (only with heater)
Measurement of the oven temperature

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Pag. 6 R2.A User Manual TRG 72x72
1.3 FRONT LAYOUT OF THE THERMOREGULATOR
1.4 LAYOUT WITH THE THERMOREGULATOR DIMENSIONS
72
72
81
15.4 24
67.4
DIS. N.052 rev.0
+-
~ ~
TC
PT100
K1 K2
1 2 3 4 5 6
7 8 910 11 12
66
8.4 14.6 11.6 14.6
31.6
Please note: dimensions are expressed in millimeters.
11 LEDs for the setpoint
position
N°.3 - 7 segment
displays
Scale of the setpoint
temperature
Rotating ring nut
to set temperature.
With the IP54 protection
class.
2 Status LEDs for
the relay outputs
Setpoint LED

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User Manual TRG 72x72 R2.A Pag. 7
2.0 INSTALLATION AND TESTING
2.1 ASSEMBLY
The TRG 72 x 72 mm is designed for panel flush mounting inside a casing.
Avoid placing the inner part of the instrument in environments with very high humidity levels or dirt that may
create condensation or introduction of conductive parts or substances into the instrument.
Make sure that the unit has adequate ventilation and avoid installation in containers that house devices that
may cause the instrument to operate outside the stated temperature limits.
Install the instrument as far away as possible from sources of electromagnetic disturbances such as motors,
remote control switches, relays, solenoid valves etc.
2.2 TERMINAL BOXES AND CONNECTION ELECTRICAL SCHEME
1) Clips to connect the thermoregulator:
1\2 Clips for power supply
3\4 Clips to connect the thermocouple
3\5\6 Clips to connect the PT100
7\8\9 Clips to connect the K1 relay
10\11\12 Clips to connect the K2 relays
+
-
~ ~
TC
PT100
K1 K2
1 2 3 4 5 6
7 8 910 11 12
+
-

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Pag. 8 R2.A User Manual TRG 72x72
2.3 WIRING AND ELECTRICAL CONNECTIONS
Before making the connections it is recommended to check that the supply voltage is displayed on the ther-
moregulator and that the absorption of the actuators to be connected to the instrument does not exceed the
maximum current allowed.
The thermoregulator is designed to be permanently built-in inside a housing, therefore it is not equipped with
either switch or inner overcurrent protective devices. It is therefore advisable to provide for the installation of
an overcurrent protective device.
Moreover, it is recommended to adequately protect the power supply of all the electrical circuits connected to
the instrument using devices (ex. fuses) proportionate to the circulating currents.
It is recommended to use cables with proper insulation, according to voltages, temperatures and operating
conditions and to ensure that the cables for the input sensors are kept away from power supply cables and
other power cables in order to avoid induction of electromagnetic disturbances. If some input cables are
screened, it is advisable to connect them to the ground on one side only
Finally, it is recommended to check that the set parameters are the right ones and that the application works
correctly before connecting the outputs to the actuators in order to avoid plant anomalies which may cause
damage to people, things or animals.
Sitec S.r.l. and its legal representatives accept no responsibility for any damage to people, things or
animals resulting from tampering, misuse, improper use or otherwise not in accordance with the in-
strument features.
2.4 SWITCHING ON AND SWITCHING OFF
To switch on / off the thermoregulator you just have to supply/not supply power to the thermoregulator.
The power supplied to the thermoregulator must be 24V (AC or DC) ± 10%.
2.5 INSTALLATION AND TESTING
1. Connect the temperature probe (thermocouple or PT100) to the thermoregulator.
2. Connect the power source to the thermoregulator, then supply power to it
3. Set-up the thermoregulator according to your needs through the configuration menu.
4. Check that the thermoregulator does not signal any error.
5. Unplug and disconnect the thermoregulator.
6. Connect the actuators to the thermoregulator.
7. Install the thermoregulator in its relative casing.
8. Start the oven (and the thermoregulator) checking that the thermoregulator does not signal errors.

SITEC S.r.l. Industrial electronics –www.sitecsrl.it
User Manual TRG 72x72 R2.A Pag. 9
3.0 TECHNICAL SPECIFICATIONS
3.1 SUMMARY TABLE WITH TECHNICAL SPECIFICATIONS
TYPE
VALUE
UNIT
COMMENTS
MECHANICAL
Dimensions
72x72
mm
See paragraph 1.4
Class of protection
IP54
-
Only for the front ring nut
Weight
220
g
Provided with connectors and
hooks
Terminal box connections
Screw terminal
-
Max 1.5 mm2 cable
Assembly
Assembly within a device
-
ELECTRICAL
Supply voltage
24
VAC/DC
±10% 50-60 Hz
Max power demand
250
mA
OUTPUTS (K1 –K2)
Max electrical load
6 (4)
A
AC1 (AC3)
Max voltage
230
V
Vac
Electrical operations
5x105
Mechanical operations
107
ENVIRONMENTAL
Temperature of operation
From 0 to +60
°C
Temperature of transportation
and storage
From -25 to +70
°C
Operation moisture
From 30 to 95
%RH
Without condensation

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Pag. 10 R2.A User Manual TRG 72x72
3.2 FACTORY SETTINGS
PARAMETER
DEFAULT
UNIT
Prb (Temperature probe)
tEr (Thermocouple K)
-
rEG (Type of setting)
OnF (On/Off setting)
-
Hy5 1nF (Lower Hysteresis)
0
°C
Hy5 5UP (Upper Hysteresis)
0
°C
T5H (Temperature to start the second heater)
0
°C
Ctr (Control temperature)
0
°C
Pb (Proportional band)
50
°C
1nt (Integral Time)
200
s
dEr (Derivative Time)
50
s
Cyt (Period of the PWM signal)
20
s
LP5 (Min time to reactivate the outputs)
0
s

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User Manual TRG 72x72 R2.A Pag. 11
4.0 CONFIGURATION MENU
4.1 MENU CONFIGURATION KEYS
To change the values, you have to act on the key to increase the value or on the key to decrease it.
These keys function with one digit each time but, if pressed for more than half a second, the value increases
or decreases rapidly and, after three seconds pressed, the speed increases even more, in order to allow the
rapid achievement of the desired value.
4.2 HOW TO ENTER-EXIT-SURF THE CONFIGURATION MENU
To access the thermoregulator configuration menu, simply press once any one of the (, , OK)
keys beneath the thermoregulator.
To exit the configuration menu, you have to go back all the menu "hierarchy" while pressing the OK
+ (EXIT) keys, or you can wait 10 seconds without pressing any button, then the thermoregulator
will automatically close the configuration menu without saving the ongoing changes.
To surf/increase/decrease the menu values you have to press the and keys.
To confirm a selection, you have to press the OK key.
To cancel a change or go back to the upper level menu, you have to press simultaneously the OK +
= EXIT keys (in this sequence).

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Pag. 12 R2.A User Manual TRG 72x72
4.3 MENU HIERARCHICAL SCHEME
Prb (Probe) [Temperature probe]
otEr (Thermocouple K)
oJ(Thermocouple J)
oPt1 (PT100)
rEG (Type of regulation)
oOnF (On/Off temperature setting)
oP1d (PID temperature setting)
Hy5 (Hysteresis) [Only visible with On/Off setting]
o1nF (Inferior)
[From 0 to 20 °C]
o5UP (Superior)
[From 0 to 20 °C]
T5H (Temperature to start the second heater)
[Visible only with On/Off setting]
o[From 0°C to full scale temperature]
Ctr (Control zone) [Visible only with On/Off setting]
o[From 0°C to full scale temperature]
Pb (Proportional Band) [Visible only with PID setting]
o[From 1 to 999 °C]
1nt (Integral Time) [Visible only with PID setting]
o[From 0 to 999 seconds]
dEr (Derivative Time) [Visible only with PID setting]
o[From 0 to 999 seconds]
Cyt (Cycle time) [Period of the PWM signal] [Visible only with PID setting]
o[From 0 to 130 seconds]
LP5 (Lapse) [Time to reactivate the outputs]
o[From 0 to 5 seconds]

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User Manual TRG 72x72 R2.A Pag. 13
5.0 SETTING PARAMETERS
5.1 SET THE SETPOINT TEMPERATURE
To set the oven setpoint temperature, you simply have to set-up the ring nut to the desired temperature,
when the ring nut is repositioned, the display shows the new setpoint temperature for 5 seconds, and the
setpoint LED is ON (see paragraph 1.3) for all the time in which the setpoint temperature is displayed.
After these 5 seconds, the setpoint LED turns off and the display shows the feedback temperature (oven
temperature).
If the ring nut is set under the temperature of 0 °C the thermoregulator turns OFF, therefore disabling the
temperature setting.
5.2 CHANGE THE TEMPERATURE PROBE
To change the temperature probe you have to enter the configuration menu (see paragraph 4.2), enter the
Prb level (see paragraph 4.3), and then select tEr if you want to use the thermoregulator K, Jif you want to
use the thermoregulator J or Pt1 if you want to use the PT100, then confirm your choice by the OK key.
Once the change is done, exit the menu and connect the temperature probe you have just selected to the
clips of the thermoregulator (see paragraph 2.2), than check that the thermoregulator doesn’t signal any er-
ror (see paragraph 6.1).
Please note: for the thermocouple (K or J) be sure to respect clips polarities, as the thermoregulator is not
designed to get if such polarities are respected, therefore it will not signal any error. To understand if the po-
larities are respected you can make a simple test: heat (even of few centigrade) the point of the thermocou-
ple, then, if the temperature shown by the thermoregulator decreases (instead of increasing) it means that
the polarities have been inverted.
5.2.1 - Operational range of the temperature probes:
Thermocouple K: operational range from 0 to 999 °C
Thermocouple J: operational range from 0 to 760 °C
PT100: operational range from 0 to 849 °C
Outside these ranges the thermoregulator will signal an under range or over range error (see paragraph 6.1).

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Pag. 14 R2.A User Manual TRG 72x72
5.3 CHANGE THE TYPE OF SETTING
To set the type of temperature control you have to enter the configuration menu (see paragraph 4.2), enter
the rEG level (see paragraph 4.3), and then select OnF to start the temperature setting by On / Off, or P1d to
start the temperature setting by PID.
5.3.1 - On/Off Setting
The (On/Off) setting is used for its ease, when you can set the temperature less precisely; consider that it is
not desirable to have a too small hysteresis in order to avoid an excessive frequency in the intervention of
the final setting element that, in case of a relay, could rapidly wear out.
5.3.2 - PID Setting
The temperature setting via PID allows to obtain an accuracy significantly higher than the simple On / Off
control, the calculation of the PID is done by adding the contributions of the proportional (see paragraph 5.7),
integral (see paragraph 5.8) and derivative effect (see paragraph 5.9).
In this case, being available 2 output relays, a PWM signal is generated by these relays, of which is calculat-
ed the duty cycle, minute by minute, by the PID algorithm, while the period of the PWM signal can be set-up
by the menu (see paragraph 5.10).
With the PID setting the 2 outputs always behave the same way, switching on and off always at the same
time, namely there is no difference between the 2 outputs.

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User Manual TRG 72x72 R2.A Pag. 15
5.4 HYSTERESIS
To set the hysteresis you have to enter the configuration menu (see paragraph 4.2), enter the level hy5 (see
paragraph 4.3), and then select 1nF to set the lower hysteresis, or 5UP to set the higher hysteresis, then select
the desired value and save the new value by the OK key.
The hysteresis can be used to filter undesired signals in the control systems, considering the signal recent
history. This prevents undesired commutations due to imprecision and weak fluctuations around one single
threshold value.
The regulator behaves in the following way:
Deactivate K1 and/or K2 (see paragraph 2.2) when the temperature (of the oven) is higher than the
“setpoint + higher hysteresis”.
Activate K1 and/or K2 when the temperature (of the oven) is lower than the “setpoint –lower hys-
teresis”.
If the oven temperature is higher than the “setpoint –lower hysteresis” temperature and lower than
the “setpoint + higher hysteresis” temperature (neutral zone) the outputs do not change their sta-
tus.
To deactivate the hysteresis, you just have to set the lower hysteresis and higher than zero.
Please note: The hysteresis can be set-up only after having enabled the On/Off temperature setting (see
paragraph 5.3).

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Pag. 16 R2.A User Manual TRG 72x72
5.5 TEMPERATURE TO ENABLE THE SECOND HEATER
In order to set the temperature to enable the second heater you have to enter the configuration menu (see
paragraph 4.2), enter the t5hlevel (see paragraph 4.3), and then select the desired value and save the new
value by the OK key.
The temperature to enable the second heater can be used to improve the temperature control, using both
the outputs (K1 and K2) when the setpoint temperature is higher than the “temperature to enable the second
heater”, then allowing to take advantage of all the oven power.
The regulator behaves in the following way:
When the setpoint temperature is higher than the “temperature to enable the second heater”, both
the outputs (K1 and K2) to set the temperature are always used.
Therefore, starting both the outputs when the oven temperature is lower than the “setpoint –lower
hysteresis” temperature and deactivating both the outputs when the oven temperature is higher
than the “setpoint + higher hysteresis” temperature.
When the setpoint temperature is lower or equal to the “temperature to enable the second heater” re-
fer to the control area (see paragraph 5.6).
In order to deactivate the “temperature to enable the second heater” you just have to set it to zero (in this
way you also deactivate the control area), while, in order to keep it always ON, you have to set the full scale
value of the thermoregulator and, in this way, you will enable only the control area.
Please note: The temperature to enable the second heater can be set only after the On/Off temperature set-
ting has been enabled (see paragraph 5.3).

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User Manual TRG 72x72 R2.A Pag. 17
5.6 CONTROL AREA
In order to set the temperature of the control area you have to enter the configuration menu (see paragraph
4.2), enter the Ctr level (see paragraph 4.3), and then select the desired value and save the new value by the
OK key.
The purpose of the control area is to improve the temperature setting in case there are more actuators con-
nected with the outputs K1 and K2, indeed (if set) the control area allows to use the two outputs with a
“smarter” system than the simple ON/OFF setting.
The regulator behaves in the following way:
If the oven temperature is higher than the “setpoint –control area” temperature and lower than the
“setpoint –lower hysteresis” temperature, then only the output K1 is enabled.
If the oven temperature is lower than the “setpoint –control area” temperature and than the “set-
point –lower hysteresis” temperature, then are enabled both the (K1 and K2) outputs.
In order to deactivate the control area, you just have to set it to zero, while, in order to keep it always ON
you have to set the full scale value of the thermoregulator, in that case the result will be that of using only
and always the output K1 to set the temperature.
The control area comes into operation only when the setpoint is lower than the temperature necessary to
start the second heater (t5H) (see paragraph 5.5).
Please note: The control area can be set only if the On/Off temperature setting (see paragraph 5.3) has
been enabled beforehand.

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Pag. 18 R2.A User Manual TRG 72x72
5.7 PROPORTIONAL BAND
In order to set up the proportional band you have to enter the configuration menu (see paragraph 4.2), then
enter the Pb level (see paragraph 4.3), and select the desired value, to then save the new value by the OK
key.
The proportional band is displayed in centigrade: within the proportional band the output power (duty cycle of
the PWM) will be proportional to the error (setpoint –feedback), outside this band the power will be maxi-
mum if the oven temperature is lower than the setpoint temperature; it will be minimum if the oven
temperature is higher than the setpoint temperature. If you reduce the proportional band, the accuracy of the
controller improves, since a smaller error is enough to cause a certain change in the output power.
There is however a limit to the reduction of the proportional band: at a certain point the system starts to
self-oscillate and the band must be increased.
In the diagram you can see how the power (duty cycle of the PWM) is slowly decreasing as the oven tem-
perature (feedback) gets close to the setpoint temperature, while outside the proportional band the power is
maximum (100%) when the feedback is lower than the setpoint temperature and, minimum (0%), when the
feedback is higher than the setpoint temperature.
Please note: The proportional band can be set up only if the temperature setting by PID (see paragraph 5.3)
has been enabled beforehand.

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User Manual TRG 72x72 R2.A Pag. 19
5.8 INTEGRAL TIME
In order to set up the integral time you have to enter the configuration menu (see paragraph 4.2), then enter
the 1nt level (see paragraph 4.3), and select the desired value and save the new value by the OK key.
The integral control was introduced to improve the accuracy of the proportional control.
Indeed, in a system controlled only by the proportional system, with the proportional band large enough not
to induce self-oscillations, the result is a stable but not sufficiently accurate system, while, with the integral
control the output power increases as long as the temperature is equal to the setpoint. At this point the out-
put of the integrator stops increasing, and keeps a steady power.
The integral control is characterized by the Integration time, described as the time necessary in order for
the integral output to vary from zero to its maximum in the presence of a fixed error equal to the proportional
band.
To disable the integral time, you have to set it to 0.
Please note: the integral time can be set up only after having started the temperature setting via PID (see
paragraph 5.3).
Hereafter is shown the behaviour of the integrator in the presence of an error equal to the proportional band
as you can see, as the integral time increases, also the time necessary for the integrator to reach the 100%
increases.

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Pag. 20 R2.A User Manual TRG 72x72
5.9 DERIVATIVE TIME
To set up the derivative time you have to enter the configuration menu (see paragraph 4.2), enter the dEr lev-
el (see paragraph 4.3), and then select the desired value and save the new value via the OK key.
The derivative action gives a response according to the speed with which the feedback is changing,
therefore gives an anticipative action.
The idea is to rapidly compensate the variations of the control variable if we see that the feedback is
increasing, the derivative action tries to compensate this deviation as a result of its changing speed,
preventing the system from moving too sharply.
Moreover, we should consider that the derivative action, differently from the proportional and integral, is
independent from the setpoint, namely the derivative gives a contribution only according to the changing
speed of the feedback without considering the setpoint position, therefore a step change of the setpoint
will not involve any change on the derivative.
To disable the derivative time, you have to set it to 0.
Please note: the derivative time can be set up only after having enabled the temperature setting via PID
(see paragraph 5.3).
Hereafter we show the behaviour of the derivative in the presence of a step change (of +20°C) of the feed-
back temperature and then the derivative immediately replies outputting a negative power (around -95%),
that then will be added to the proportional and integral effect of the PID.
You can easily notice that, as the derivative time increases, also increases the time necessary for the
derivative contribution to be again equal to 0, therefore, as the derivative time increases, also increases the
contribution of the derivative in the PID.