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VTS Ventus VVS300 [23/47] Temperature regulation strategy
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uPC3 – rel 1.8 – 11/2021
23
If the room temperature is greater than the setpoint,
the unit starts in cooling mode and remains in
cooling mode until the room temperature becomes
lower than the heating setpoint for a settable time,
then the heating mode is activated with the heating
setpoint. In the same way, if the starting
temperature is lower than the heating setpoint the
unit starts in heating mode and remains in heating
mode until the room temperature becomes greater
than the cooling setpoint for a settable time.
6.4 Temperature regulation strategy
External compensation
In case the external temperature probe is present,
it is possible to adjust the temperature setpoint
accordingly to the value read by this probe. The
compensation can be direct or reverse and it is
done adding an offset to the temperature setpoint.
The compensation is done only with room or return
air temperature regulation. In case of supply
temperature regulation there is no need for
compensation, because it is the regulation itself
that acts to compensate the external conditions.
Return/Room regulation
The regulation of the unit could be done according
to return, supply or room set.
The calculation of supply set in case of return or
room regulation is done by a PID that change the
setpoint between a min and max value.
Supply regulation
The temperature regulation is based on supply
temperature and its setpoint. If the setpoint set is
the room set or return set, this will be converted to
supply set.
To calculate the power of devices, a PID sequence
is used.
The following graph show the PID sequence in
case of cooling:
The following graph show the PID sequence in
case of heating:
With a unique setpoint and different sets of PID
parameters, the first request is calculated with a
standard PID. The second request starts when the
first one has reached 100%. The setpoint for the
second device regulation is the same, while the
PID set of parameters is different. According to the
PID behaviour of the second device, the
percentage of activation of the second device at the
start up should be equal to ‘’offset’’, but thanks to
the incremental PID it is possible to consider only
the last calculated delta so that there aren’t any
bumps, then the second device will start from the
minimum output, then it will regulate according to
PID parameters and supply temperature.
In case we have 2 devices and one is not available
when required from the sequential PID regulation -
for activation conditions not verified (i.e.
freecooling/freeheating conditions) or active
alarms - the request passes to the other one. If the
first device becomes available again the device will
be turned on at 100%.
6.5 Fresh air regulation
In case of unit without the mixing damper, the
supply air is always coming from the outside: if the
external temperature is better than the room or
return temperature and the activation of
freecooling/freeheating is verified (external
temperature lower than the regulation temperature
Room temp.
Cooling
Heating
External temp.
Return/Supply
Set
Set
Set
Diff.
Offset
Supply temp.
Set
Freecooling or
rotary recovery
Cooling coil
100%
0%
Supply
temp.
Set
Freeheating or
recovery
Water heat
100%
0%
Reheat
Min set.
Max set.
0%
100%
Содержание
- Software for air handling units 1 19 1
- Ventilation vts 1
- Introduction 4
- Main features 4
- Field connections 5
- Start up 6
- I o configuration 8
- Installation 8
- All sensor temperature with additional b6 after recovery on supply 10
- Cav regulation for fan 10
- Compact suspended floor rrg unit with built in compact suspended floor rrg unit with built in automation standard equipped with an 10
- Expansion module i o 10
- Expansion module i o mainboard control circuit 10
- Humidity return sensor 10
- Standard elements for all units 10
- Standard input output for function 10
- Supply 24v 10
- Ventus cbx controlbox automation standard ventus cbx controlbox automation standard equipped with an expansion module i o pcb ec 10
- Adjustable switching level individual sections 11
- Adjustable switching level of individual sections 11
- Dx cooler c_dx control pid controller cooling 11
- Electric heater he control pid controller heating 11
- Fan v control standard work percentage control 11
- Filters f control compact pressure transducer 11
- Limiting the minimum maximum signal 11
- Limiting the minimum signal 11
- Low air temperature alarm 11
- Pid control for regulation cav 11
- Pid control for regulation vav 11
- Pid controller cooling recovery 11
- Pid controller protecting the rebate sensor 11
- Recovery plate cross hex p control pid controller heat recovery 11
- Ventus pressure switch 11
- Water cooler c_cw control pid controller cooling 11
- Water heater h_cw control pid controller heating 11
- Adjustable switching level of individual sections 12
- Dxh reverse c_dxh control pid controller heating 12
- Humidifier w control pid controller humidity 12
- Limiting the minimum maximum signal 12
- Limiting the minimum signal 12
- Mixing chamber m control pid controller heating 12
- Pid co2 controller 12
- Pid controller compensation for supply air humidity 12
- Pid controller cooling 12
- Pid controller cooling recovery 12
- Recovery glycol g control pid controller heat recovery 12
- Recovery rotary r control pid controller heat recovery 12
- Redundant fan the fan section contains doubled fans motors and inverters one fan is working the other is a reserve in the event of a failure in addition the operating hours counters decide on routine switching between the fans so that the load and wear of both units is uniform when switching from one fan to another there is a gap to adjust the position of the dampers directing the air flow 12
- Addtitonal temp sensor 13
- Preheater control pid controller heating 13
- Reheater control pid controller heating 13
- Application code 14
- Modbus devices 14
- Unit configuration 14
- Additional settings for the control circuit module on the screens 16
- Command type data type addr 16
- Hmi advanced menu other j03 hmi advanced menu other j03 the menu from which we activate individual extension modules 16
- Holdingregister int 0 16
- Holdingregister int 1 16
- Holdingregister int 2 16
- Holdingregister int 3 16
- I r input register h r holding register 16
- Important information when using an external humidity transducer turn off the measurement on the control circuit board hmi advanced menu other j03 j04 co2 sensor 16
- Important information when using an external pressure transducer turn off the measurement on the control circuit board hmi advanced menu other j03 j04 humidity sensor 16
- Inputregister int 0 16
- Inputregister int 1 16
- Inputregister int 2 16
- Inputregister int 3 16
- Module i o 16
- Pressure sensor pressure sensor 16
- Vts mainboard control circuit 16
- Vts pcb ec 17
- Display hmi advanced 18
- User interface 18
- User menu 18
- Ability to edit some of them for more information on the parameters that can be changed see the parameters table default password 0001 20
- Access the main menu 20
- Advanced user maintenance read only access 20
- Attention there are two options for the calendar program details in the chapters on the calendar and service menu 20
- Attention to change the temperature setpoints attention to change the temperature setpoints simply turn the knob 20
- Clock button entering the auto mode the driver will work according to the schedule from the calendar settings 20
- Default password 0002 20
- Display hmi basic 20
- Fan button setting the fan speed 20
- First letter second letter n 20
- Hmi basic also has a built in clock with support for time schedules 20
- If a given day is not defined as special but is in a special period then the mode for the special period is implemented 20
- If both of these do not occur the basic schedule is implemented 20
- Implementation of the schedule considering the priorities of time schedule settings the order of their implementation is as follows the first special day settings are those with the highest priority the other settings are then ignored 20
- In the parameters screen the access needed to edit in the parameters screen the access needed to edit the parameters is shown always with the same codes an example follows 20
- Lcd display indicates the actual temperature in the room or on the main control sensor and the selected setpoint operating mode fan speed time and day of the week 20
- Manufacturer read write access to all parameters 20
- Menu description 20
- On off button switch between on off status forces the control panel to stop or enables selection of the operating mode 20
- Once the password is entered it will be maintained for 5 minutes from the last time a key was pressed and then the password will need to be re entered in order to access the parameters of the advanced functions in the log out menu the password can be force entered without waiting 5 minutes 20
- Password management 20
- Regardless of the displayed screen pressing the programming key accesses the password entry screen which allows access to the main menu shown below the code of the mask is determined by the menu tree 20
- Rotary button change of settings by turning accepting new values by pressing 20
- Service read access to all parameters with the 20
- The basic interface with built in temperature sensor the basic interface with built in temperature sensor 20
- The program has 3 different password levels the program has 3 different password levels 20
- To all parameters default password 0000 20
- User setpoint 21
- Cooling heating changeover 22
- Functions 22
- On request 22
- Start stop sequence 22
- Fresh air regulation 23
- Temperature regulation strategy 23
- Devices activation 24
- Humidity regulation 24
- Antifreeze management 25
- Fans control 26
- Minor functions 27
- Mixing chamber control 27
- Regulation 27
- Supervisor 29
- Alarms 30
- Alarms interface 30
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