Industrie technik DB-TA-33A Manuale utente

WARNING

Each single operation done on the unit, either installation or maintenance, must be done without main supply on the unit and

external loads. Such operations are permitted only by skilled workers. Industrietechnik is not responsible for possible damages

caused by an inadequate installation and/or by removed or exchanged security devices. The thermostat must be mounted in

places far from heat sources and freely accessible for air convection at a height of approx. 1,5 m. Do not install the thermostat

on particularly cold or heat walls.

APPLICATION

The series of thermostats DB-TA-33A allow the temperature control in buildings interiors for heating, air conditioning with 2 or 4

pipe systems with proportional integral regulation. The unit has one 0..10 V output (2 pipe system) or two 0..10 V outputs (4 pipe

system) according to conguration choosen and it is possible to have:

- in 2 pipe system, local or centralized changeover by a single wire, or automatic changeover according to temperature of water

sensor mounted upstream the valve. In 4 pipe system, the changeover is done automatically according to room temperature.

- switches on/off and 3 speeds (DB-TA-33A-13A) for power on and off the unit and fan-coil

- economy remote function with a single wire

- autotuning function with the use of remote sensor only

The unit has a display with 3 characters for visualizing room temperature, parameters setting and 2 keys +-for parameters setting.

Instruction for setpoint setting (level 1):

The display indicates the room temperature.

Push the key +the message “SEt” is visualized on the display.

Push the key +again one time, the value of the setpoint is visualized on the display.

To modify the setpoint value push the key +or -to increase or decrease the value.

To save the modications done wait for 4 s, the message “SEt” is then visualized again on the display. Wait for another 4 s until

is visualized the room temperature on the display. The parameters are then saved and the unit is ready to do the regulation.

Instruction for other parameters setting (level 2 or 3):

To access the parameters of level 2 or 3 proceed with the following procedure:

Push - until the message “PAS” is visualized on the display (several seconds).

Push +the value 6.0 appears on the display.

Push the key +up to visualize 6.5 (level 2) or 8.5 (level 3).

Wait for 4 s for visualizing the name of the rst parameter of level 2: “tiP” or level 3: “LEA”.

At this point it is possible:

- to move in the list of the parameters

- to modify a certain parameter.

To move in the list of parameters, push the key -when the names of them are visualized. To modify the value of one of them

move to the name of the parameter to change and hit the key +to see the value on the display.

Then push the key +or -for increasing or decreasing it.

To return to the list of parameters wait for 4 s until is visualized the name of the parameter again.

To save modications done to parameters wait until on the display appears the room temperature again (maximum 8 seconds).

INDICATIONS AND ALARMS

· Flashing message “SEn” on the display indicates:

open sensor or short circuit on it.

· Message “ C” alternating with temperature indicates:

Cooling mode selected without economy function (setpoint = SEt see parameters).

· Message “ H” alternating with temperature indicates:

Heating mode selected without economy function (setpoint = SEt see parameters).

· Message “EcC” alternating with temperature indicates:

Cooling mode selected with economy function (setpoint = SEo see parameters).

· Message “EcH” alternating with temperature indicates:

Heating mode selected with economy function (setpoint = SEo see parameters).

When the unit is switched on during stabilization phase the following messages (“15.0“,“14.0“,... “10.0“, “P-I”) appear on the display

before seeing the value of temperature. If the message “Err” is then visualized instead of temperature, advise technical assistance.

Proportional integral

temperature regulator P.I. DB-TA-33A

PARAMETERS SETTING

LEVEL 1:

SEt Setpoint:

It allows to x the setpoint that corresponds to the room temperature required.

Setting range:

   6,0...45,0 °C default value: 20,0°C

PAS Password:

access key to level 2: PAS=6.5.

access key to level 3: PAS=8.5. (only if remote sensor is used)

Setting range:

6,0...45,0 default value: 6,0

LEVEL 2:

tip Type of system:

It denes the type of system choosen: 2 pipe o 4 pipe system. According to selection done different parameters are

then visualized.

Setting range:

2P = 2 pipe systems

 4P = 4 pipe systems default value: 2P

2 pipe systems operating mode

bP Proportional band:

The proportional band is the part of output that changes proportionally with error signal. The default setpoint is on the

center of proportional band with parameter MAr = 5.0. Changing parameter MAr it is possible to move proportional

band around the setpoint. Out of the proportional band, the output signal is always saturated at 0 V or at 10 V.

Setting range:

 1,0...30,0 °C default value: 5,0°C

Output with only proportional action (without integral action)



reverse

action

direct

action

tI Integral time:

The integral time is the speed at which a corrective increase or decrease in ouput is made to compensate for offset

which usually accompanies proportional only processes. The more integral time entered, the slower the action. The

less integral time entered, the faster the action. A too small integral time can make the system oscillating.

To exclude integral action and make the unit a proportional regulator set the value of parameter to noI with key +.

Setting range:

1,0...30,0 minutes (with integral action)

noI (without integral action) default value: 20,0minutes

StA Working season:

It denes if 0...10 V output operates in direct action (cooling) or in reverse action (heating). According to setting done

it is possible to select the working season directly on unit or to decide to choose it remotely. On this last case it is

possible to have two possibilities:

- with a remote centralized switch connected between terminals 3 and 13 (see gure 1, contact opened = cooling

mode, contact closed = heating mode)

- with water sensor (buying code NTA020-027P) connected between terminals 13 and 14 and mounted upstream

the valve (see gure 2).

Setting range:

 H-> heating Water temp.

Cooling mode Heating mode

C-> cooling

rem -> remote selection default value: H

(1) DB-TA-33A-13A (1) DB-TA-33A-13A

Fig. 1 Fig. 2

MAr Manual reset:

Changing the value of this parameter it is possible to move the proportional band around the setpoint. The unit is in

volt.

Setting range:

0,0...10,0 Volt default value: 5,0Volt



reverse

action

direct

action

COr Correction of temperature:

It allows to add a value to the measured temperature to increase precision (let the unit switch on for 45 minutes before

setting the parameter when the internal sensor is used)

Setting range:

-5,0...5,0°C default value: 0,0°C

PoE Method of regulation:

It denes if unit operates with PI or P regulation or if the unit operates in manual test mode for doing some test

on the system to regulate in open loop mode. This type of test can be used only if one has a measuring system for

temperature. In order to see how to use this parameter see APPENDIX 2, page 9, method 3.

Setting range:

0...10,0V -> manual operating

Pi -> proportional integral regulation default value: Pi

SoC Economy setpoint for cooling:

It denes the setpoint for economy function in cooling mode independently of main setpoint (SEt).

The unit works with main setpoint if the contact ECO connected between terminals 3 and 12 is open. If contact is

closed, the unit works with economy cooling setpoint if cooling mode is selected.

Setting range:

   6,0...45,0 °C default value: 25,0 °C

SoH Economy setpoint for heatin:

It denes the setpoint for economy function in heating mode independently of main setpoint (SEt).

The unit works with main setpoint if the contact ECO connected between terminals 3 and 12 is open. If contact is

closed, the unit works with economy heating setpoint if heating mode is selected.

Setting range:

   6,0...45,0 °C default value: 15,0 °C

SLC Cooling limit:

If water temperature sensor drops below the limit SLC, cooling is the working season if parameter Sta=rEM

Setting range:

0,2,,,21,0 °C default value: 21,0 °C

SLH Heating limit:

If water temperature sensor reaches the limit SLH, heating is the working season if parameter Sta=rEM

Setting range:

22,0,,,75,0 °C default value: 30,0 °C

Note: when unit is powered on, if water sensor is between SLC and SLH, heating is the working season if Sta=rEM

vi5 Type of sensor visualized: “ Ai”… “ Li”

ui5 = “ Ai” -> air sensor visualized

ui5 = “ Li” -> liquid sensor visualized (temperature can be visualized up to a value around 75°C. If water temperatu-

re sensor is upper 75°C the message “97.0” is visualized)

4 pipe systems operating mode

bPH Proportional heating band:

The proportional heating band is the part of heating output that changes proportionally with error signal. The setpoint

is at the beginning of the proportional heating band.

Setting range:

 1,0...30,0 °C default value: 5,0°C

bPC Proportional cooling band:

The proportional cooling band is the part of cooling output that changes proportionally with error signal. The setpoint

for cooling is the setpoint added to neutral zone and is at the beginning of the proportional cooling band.

Setting range:

 1,0...30,0 °C default value: 5,0°C

Output with only proportional action

(without integral action)

tI Integral time:

The integral time is the speed at which a corrective increase or decrease in ouput is made to compensate for offset

which usually accompanies proportional only processes. The more integral time entered, the slower the action. The

less integral time entered, the faster the action. A too small integral time can make the system oscillating.

To exclude integral action and make the unit a proportional regulator set the value of parameter to noI with key +.

Setting range:

1,0...30,0 minutes (with integral action)

 noI (without integral action) default value: 20,0minutes

dEZ Dead zone:

It denes the dead zone between heat and cool where there is not any regulation (only for proportional action)

Setting range:

0,5...4,0°C default value: 1,0°C

COr Correction of temperature:

It allows to add a value to the measured temperature to increase precision (let the unit switch on for 45 minutes before

setting the parameter when the internal sensor is used)

Setting range:

-5,0...5,0°C default value: 0,0°C

PoE Method of regulation:

It denes if unit operates with PI or P regulation or if the unit operates in manual test mode for doing some 

test on the system to regulate in open loop mode. This type of test can be used only if one has a measuring system

for temperature. In order to see how to use this parameter see APPENDIX 2, page 9, method 3.

Setting range:

0...10,0V -> manual operating

Pi -> proportional integral regulation default value: Pi

ofS Offset for economy function:

It allows the change of setpoint position for economy function. The unit works with main setpoint if the contact ECO

connected between terminals 3 and 12 is open. If contact is closed, the unit works with modied setpoint and increased

neutral zone. See diagram below for more details.

Setting range:

0...5,0°C default value: 5,0°C

LIVELLO 3: AUTOTUNING

The level 3 is accessible only with the password 8.5 and if the unit uses remote air sensor. With the use of internal sensor it is

not possible to use the autotuning function.

This function allows the calculation of parameters Bp, Ti automatically by doing an on/off cycle.

Before doing such a cycle, set the setpoint for autotuning.

The setpoint for autotuning in 2 pipe system can be done adding or substracting the value of parameter oFA (offset for autotu-

ning) to the setpoint (main setpoint if the contact ECO is opened or economy setpoint if the contact ECO is closed) according to

operating season (see parameters).

In 4 pipe system autotuning is done on setpoint (main setpoint if the contact ECO is opened or economy setpoint if the contact

ECO is closed).

LeA Level for autotuning:

During the autotuning cycle the regulator outputs 0 V or the voltage dened by parameter LEA. The selection is

done automatically considering the season working and temperature from setpoint:

- in heating if temperature is lower than setpoint, the output is equal to LEA Volt.

- in heating if temperature is upper than setpoint, the output is equal to 0 Volt.

- in cooling if temperature is upper than setpoint, the output is equal to LEA Volt.

- in cooling if temperature is lower than setpoint, the output is equal to 0 Volt.

In 2 pipe systems, the active output during autotuning is the 0..10 V single output.

In 4 pipe systems, the active output during autotuning is the 0..10 V heating output if at the beginning of autotuning

cycle temperature is lower than setpoint. On this case autotuning is done in heating. If temperature is upper than the

setpoint at the beginning of the autotuning cycle, the active 0..10 V output is the cooling output. The autotuning is

done on this case in cooling.

Choose a level that avoid high oscillations.

Setting range:

   0...10,0 V default value: 5,0 V

oFA Offset for autotuning: (it appears only for 2 pipe systems)

ECO opened and heating mode: set autotune = SEt - oFA

ECO opened and cooling mode: set autotune = SEt + oFA

ECO closed and heating mode: set autotune = SEo - oFA

ECO closed and cooling mode: set autotune = SEo + oFA

Setting range:

   0...5,0 °C default value: 1,0 °C



autotuning in 2 pipe

system: heating

autotuning in 2 pipe sy-

stems: cooling



autotuning in 4 pipe

systems

AUt Autotuning start:

Setting the paramerter to YES, the autotuning cycle starts at once. During autotuning cycle it is not possible accessing

to setpoint and others parameters. So before starting the cycle, verify parameters are correctly set. If they are not set

correctly it is possible to stop the cycle inserting the password 8.5 and inserting no to parameter AUtor by powering

off and on the unit.

During autotuning cycle the display alternates the indication of temperature and one of the following message:

 AUt :initial phase of autotuning.

At1 :phase 1 of autotuning cycle.

At2 :phase 2 of autotuning cycle.

At3 :phase 3 of autotuning cycle.

At the end of autotuning cycle the display alternates one of the following messages and temperature:

End :autotuning cycle ended. In 2 pipe system proportional band and integral time are calculated. In 4 pipe system

proportional band BpH=BpC and integral time Ti are calculated.

ErC :initial autotuning cycle error. The cycle didn’t begin correctly. For instance if operating season is heating in 2 pipe

system and the temperature is upper than the setpoint at the begining of autotuning cycle, it is not possible to

start the cycle. The cycle must begin with the voltage in output set to LEA (see autotuning cycle drawings indicated

above).

Ert :maximum time for autotuning cycle reached. The maximum time for autotuning cycle is 4 hours. If this time is

overcome, this message is shown on the display and parameters Bp and Ti are not calculated.

Er0 :parameters calculated at the end of autotuning cycle are out of range. The maximum or minimum value of para-

meter calculated is assigned. For instance, if Ti calculated is upper than 30 minutes (Ti max), Ti is set to 30. If Ti

calculated is lower than 1 minute, the value 1 minute is set to parameter Ti.

Setting range:

   no...YES default value: no

TECHNICAL FEATURES

Power supply: 24 Vac +/-10% 50/60 Hz

Sensor: internal NTC 10K or remote sensor (NT0220-NTC10-02 code).

Measuring range: 0..55°C

Setpoint range: 6..45°C

Resolution: 0.1°C

Inputs: - remote change-over (only for 2 pipe conguration -> parameters tiP=2 and StA=rEM, see parameters

setting).

- economy function

Outputs: valves: 1 or 2 outputs 0..10 Vdc (Rload>10Kohm) (see wiring diagrams)

speeds: 6A 24/230 Vac, 50/60 Hz

Operating temperature: 0..45°C, 10..90%r.h. (with no condense)

Power consumption: 1 W

Visualization: 3 characters LCD display

Casing: 144 x 82 x 34 mm

Protection class: IP30, class II

CE standards: EN 60730-1, EN 61000-4-2, EN61000-4-4, EN 61000-4-5, EN 5014, ENV 50141

ELECTRICAL WIRING

tiP = 2 (2 pipe system)

StA= rEM (see parameters)

tiP = 2 (2 pipe system)

StA=H o C (see parameters)

tiP = 4 (4 pipe system, see parameters) Jumper layout

J1, J2 closed = internal sensor

J1, J2 opened = remote air sensor

ECO closed = economy function on

ECO opened = without economy function

(*) remote air sensor NT0220-NTC10-02

(**) water sensor NTA020-027P (see parameter StA)

(***) remote centralized contact (see parameter StA) C/O closed = heating

C/O opened = cooling

Water sensor mounting

(tiP=2, StA=rEM)

(1) DB-TA-33A-13A (1) DB-TA-33A-13A

(1) DB-TA-33A-13A

Warning: Pay attention to keep the cables of remote sensor and water sensor far from the power cables and EMI disturb sources.

Use H05VC-K cable for pipe mounting or H05VC-F otherwise.

APPENDIX 1

Autotuning

The regulator calculates optimum parameters PI for the room regulated and save them in EEPROM so that when the controller is

powered up after being shut down, the controller does not need to be autotuned again. The regulator use the same parameters

until the cycle is again initiated.

The autotune parameters are only good for the process the autotune function was used on. The autotune function should be

performed again for the following conditions:

- setpoint signicantly changed

- the load is changed or relocated,

- change of position for remote sensor

- other disturbances occur which might change the dynamics of the system.

The autotuned control parameters are not always perfect for every applications, but almost always give the operator a good

starting point from which further renement of control parameters can be performed manually.

In some cases the autotune function does not perform well or does not perform at all:

1. The system is affected by process disturbances external to the control loop during autotuning (windows opened, load variation)

2. The system is very dynamic. This is the case in which the heating or cooling power is too high for the volume of room regulated.

Considering the conditions for autotuning cycle, some large overshoots can be veried.

3. The system is very insulated and cannot cool down (heating season) or heat up (cooling season) in a timely manner. For such

systems the autotuning cycle would take a very long time to complete with questionable results.

During autotuning the period of oscillations, overshoots and undershoots are measured. At the end of the cycle Bp, Ti parameters

are calculated.

APPENDIX 2

Manual parameters setting

Proportional band

The width of the proportional band depends of the dynamics of the system. The rst question to ask is, how strong must my

output be to eliminate the error between the setpoint and temperature ?

The larger the proportional band (low gain), the less reactive the process. A proportional band too large, however, can lead to

process wandering or sluggishness. The smaller the proportional band (high gain), the more reactive the output becomes. A

proportional band too small, can lead to over-responsiveness leading to process oscillation.

A proportional band with is correct in width approaches the setpoint as fast as possible while minimizing overshoot. If a faster

approach to setpoint is desired and process overshoot is not a problem, a smaller or narrower proportional band may be used.

If process overshoot cannot be tolerated and the approach to setpoint does not have to be quick, a larger proportional band

can be choosen.

Integral time

With proportional band alone, the process tend to reach a point away from setpoint. This offset is due to the difference betwe-

en the output needed to mantain setpoint and the ouptut of the proportional band at setpoint.

In the case of 2 pipe system with MAr=5V (50% of proportional band) if it is necessary a voltage different from 50% to mantain

the setpoint, the offset is the difference between them.The integral action eliminates this difference.

The integral action eliminates this difference by adding or substracting a value to the proportional action alone.

Integral time is the speed at which the controller corrects for offset. A short integral time means the controller corrects for offset

quickly. If the integral time is too short, the controller would react before the effect of previous output shift, due to dead time or

lag time, could be sensed causing oscillations.

A long integral time means the controller corrects the offset over a long time. If the integral time is too long, the offset will remain

for some time causing slow responding or sluggish control.

Proportional band with

correct width

Proportional band

too small

Proportional band

too large

Method 3:

A last method that can be used is the open loop test by doing a step change in output signal manually (output 9-10).

The goal is to suppose the response system temperature when a step change is done in output as indicated on the following picture:

1. Put the regulator in manual mode by setting parameter POE from PI to a value from 0 to 10V. Write this value (POE1).

2. Let the temperature stabilizes.

3. Increase the ouput voltage to do a step change. Write the value choosen (POE2).

4. Map the temperature as indicated on picture.

5. The gain of process is given from following expression

To set parameters manually, each parameter must be set. One can apply the method of test and error.

Method 1:

Proportional band setting:

1. Set the parameter Ti to noIin order to put the regulator in proportional regulator only.

2. Set a large proportional band.

3. Change the setpoint a little and observe how the system is reacting. The response will be sluggish.

4. Tighten by decreasing the value in half. Change the setpoint a little and observe how the system is reacting. If the system is

still sluggish and does not oscillate, tighten by decrease the value in half again.

5. Repeat the point 4 until the system begins to oscillate constantly.

6. Multiply last proportional band set by 2.

Integral time added

1. Set a large integral time.

2. Change the setpoint a little and observe how the system is reacting. The response will be sluggish.

3. Tighten integral time by decreasing the value in half and repeat the point 2 until an oscillating response is obtained with a

small setpoint change.

4. Multiply last integral time obtained on point 3 by 2.

Method 2:

Another method is the Ziegler-Nichols method. Repeat point 1 to 4 of proportional band setting in order to nd out the proportional

band that creates stable oscillations. By measuring the period of oscillations and the proportional band limit BpLim set, parameters

Bp and Ti are calculated for regulation.

Decrease of proportional band:

test 1: dotted line

test 2: line with points

test 3: continuous line

Decrease of Ti:

test 1: dotted line

test 2: line with points

test 3: continuous line

Bp= 2 BpLim

Ti = 0.83 period

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