Monodraught INVENT 2 Quick start guide

INVENT 2
Operational Manual

2
CONTENT
Power Reset Button Additional I/O
System Overview Real-time Clock Backup Battery Sensor 1/2 Input
BACnet Zone Inputs/Outputs Additional Temperature Sensor
and averaging
4 6 9
4 6 9
6 8
11
4 7 9
6 8
4 7 9
6 8 11
4 7 9
6 9
4 7 9
5 7 10
6 8 11
5 7 10
5 7 11
5 8 11
Buttons Fire Alarm Input (Optional) Cooling Solid-State Relays
DC Power Jack (J2) & Power Terminal (J3) Master Controls BMS I/O
General Features Damper/Louvre Connection
USB Fault Output (Optional) Night-time cooling
LEDs Smoke Vent Input (Optional) Control Strategy
RS485 Competition Key Switch Input (Optional) Other Information
User Interface Rain Sensor Input (Required) General Purpose Inputs
SD Card Wall Actuator Connection Zone Usage
JTAG Fireman’s Key Switch Input (Optional) Input Priority List
Connectivity External Temperature Input (Required) CO Control
LCD Heating Interlock Input (Optional) Heating Solid-State Relays
DIP Switches RS485 Digital Interface

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The iNVent 2 Control system is a
microprocessor based system to
control fourzones ofMonodraught
Natural Ventilation systems. It is
the successor of the iNVent control
panel and by default operates in
the same way, yet has a range of
additional features and flexibility
that allows it to do so much more.
DAMPER/LOUVRE
0V 24V
DMP. LVR.
WALL ACTUATOR
0V 24V
Zone #
0V 24V 0V 24V
SENSOR 1 SENSOR 2
RS485
DMP. LVR.
RAIN
SMOKE
FAULT
COM
NO
COM
O
R
COM
COM
COM
H
C
ALARM
HEAT
EXTERNAL TEMP.
0V
24V
COM
O
C
FIRE SWITCH
COMP SWITCH
COM
C1
C2
DAMPER/LOUVRE
0V 24V
DMP. LVR.
WALL ACTUATOR
0V 24V
Zone #
0V 24V 0V 24V
SENSOR 1 SENSOR 2
RS485
DMP. LVR.
DAMPER/LOUVRE
0V 24V
DMP. LVR.
WALL ACTUATOR
0V 24V
Zone #
0V 24V 0V 24V
SENSOR 1 SENSOR 2
RS485
DMP. LVR.
DAMPER/LOUVRE
0V 24V
DMP. DMP. LVR.
WALL ACTUATOR
0V 24V
Zone #
0V 24V 0V 24V
SENSOR 1 SENSOR 2
RS485
LVR.
Z1 COOLING
Z2 COOLING
COM
NO
NO
COM
COM
COM
NO
NO
Z2 HEATING
Z1 HEATING
Z3 COOLING
Z4 COOLING
COM
NO
NO
COM
COM
COM
NO
NO
Z4 HEATING
Z3 HEATING
COOLING/HEATING SOLID STATE RELAYS
MASTER CONTROLS
0V Z324V
0V Z424V
Z4Z3Z2Z10V
0V Z124V
0V Z224V
Z4Z3Z2Z10V
BMS
INPUTS
BMS
OUTPUTS
GENERAL PURPOSE
MONODRAUGHT iNVent 2
24V
0V
24V
24V
0V
B
A
BUTTON2
BUTTON1
LED3
LED7
LED6
LED4
LED2
Tx
Rx
LED10
LED17
LED5
LED1
LED11
LED8
LED9
LED12
LED13
LED14
LED15
LED16
LED18
5.3 4.2
5.4 8.1 8.2 4.1 9.4 9.3 7.2 7.67.3
4.3.1 4.3.4 4.3.57.4
8.4
5.1 6.3 5.2 6.1 9.1 9.2 7.7 7.57.1
3.1 6.4 6.2 7.8
4.3.3
SYSTEM
OVERVIEW

4
SYSTEM
SPECIFICATIONS
DC Power Jack (J2) & Power Terminal (J3) (3.1)
LCD (4.1)
Buttons (4.2)
LEDs
Page Button
Zone 24V Power LEDs (4.3.1)
Scroll Button
The iNVent 2 control panel is powered by an external 60W switched mode
power supply that converts 240V AC to 24V DC. This 24V DC supply is
distributed throughout the panel via resettable fuses to each of the 4 Zones,
as well as to the other auxiliary 24V feeds. The 24V DC is also stepped down
to 3.3V which is used to power all the control circuitry on the PCB. This means
that the 24V feed to a connected product can be shorted without aecting
the operation of the panel or the rest of the connected devices.
The External SMPS has a current limit of 2.5A, but in actual use, this needs to
be de-rated to 2A in order to accommodate surge currents when the unit is
powered on.
iNVent 2 uses an LCD, buttons and LEDs to communicate its operation to the
user.
The DC power Jack (J2) is used to connect power to the panel from the
external power supply, and is centre positive.
The Power Terminal (J3) is for future use when the power supply will be
integrated within a new design case
The 20 x 4 Character LCD is the primary method of displaying information
about the iNVent 2 panel. It provides information on all the configuration
settings, as well as the current status of the control panel. By default, it shows a
splash screen with the model, date/time and system status. Through the use of
buttons, the screen can be navigated through a number of pages of information.
The Page button changes the screen between the global information and
cycles through the 4 zones.
Each zone has a green LED to the le of the Damper/Louvre Terminal which
indicates the status of the 24V power available for that zone. If the LED is
iNVent 2 uses a number of LEDs to display status information to the user.
The Scroll button scrolls the information shown for the global or zone page
displayed. A long press of this button will change the status information
between values and voltages (i.e. % <-> V).
Power
User Interface

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SYSTEM
SPECIFICATIONS
USB (5.1)
JTAG (5.2)
Auxiliary 24V Power LED
Heating and Cooling LEDs (4.3.4)
Fault LED (4.3.5)
USB Communications, Heartbeat, and Power LEDs (4.3.3)
The external temperature sensor, rain/heat connector, RS485 4-way terminal
and general purpose inputs are supplied by the auxiliary 24V which is
protected from the main 24V supply by a resettable fuse. Any shorts or
overloads on these connections will trip the fuse, removing power from these
connections and causing LED3 (located between the buttons and the 4-way
RS485 terminal) to turn o.
The 4 x Heating and 4 x Cooling solid state relays are silent in operation, so
LED 8-9 and LED 11-16 show the status of the SSRs. The green LEDs indicate
that the corresponding cooling relay is active and the red LEDs indicate that
the corresponding heating relay is active. Each LED is positioned to the right
of the terminal it corresponds to.
The Fault output is a solid state relay and has an LED to indicate its operation.
When the panel is o or a fault has occurred, the relay de-energises and
LED 18 turns o. If LED 18 is on, then it indicates that the system is OK and
operating normally.
The USB type B socket (J7) on iNVent 2 allows an engineer to connect to the
panel in order to see the status and configuration of the panel via the iNVent
Configurator soware. This enables the iNVent 2 panel to be reconfigured
to operate in more advanced and custom configurations than the default
configuration.
The JTAG programming connector (K1) is used for programming new
firmware to the panel using an ST Microelectronics STLinkV2 programmer. It
is also used for internal development of new firmware.
The cluster of 4 LEDs below the USB port are used to indicate communications
over the USB port, as well as indicating the presence of 3.3V power to the
control circuitry and operational status of the panel.
LED 2 indicates data transmission to the PC, whilst LED 4 indicates data
transmission from the PC.
LED 6 indicates that there is 3.3V on the PCB, which means that the control
circuitry is powered. If 24V has been connected to the panel but the power LED
does not illuminate, then there is a fault in the panel’s 24V to 3.3V power supply.
LED 7 is the heartbeat LED and the purpose of the LED is to flash intermittently
to indicate that the system is active and operational. If this light fails to flash,
then there is an issue with the control circuitry or firmware.
illuminated, then the 24V power for that zone is active. If too much current is
drawn through a short circuit or because of overloading by too many devices, the
resettable fuse will trip until the load is reduced to acceptable levels and the LED
will turn o. These LEDs are marked on the PCB as LED1, LED5, LED10 and LED17.
Connectivity

6
RS485 (5.3)
SD Card (6.1)
DIP Switches (6.2)
Reset Button (6.4)
Real-time Clock/Backup Battery (6.3)
BACnet (5.4)
The general RS485 connector (J1) is a 4-way terminal that provides 24V DC
power and RS485 dierential signals to an external device that communicates
over RS485. This is for future functionality and is not yet implemented in
firmware or in the iNVent Configurator.
iNVent 2 has an SD card socket which is used to data-log the system
operation. 2 types of file are created on the SD card, a data-log of the system
status and an event log of notable events. This data can be used to analyse
the operation of an iNVent2 system and associated products to provide case
study analysis of how the system is performing and allows Monodraught
The DIP switches on iNVent 2 provide some alternative functions /operational
modes.
At the moment these are only used for testing purposes.
They must all be set to “OFF” to ensure normal operation.
If the panel needs to be reset for some reason, instead of cycling the power,
the micro-controller can be reset using the reset button (S3).
The iNVent 2 panel has a built-in real-time clock which it uses for various
functions such as time-stamping data logs, calculating the current
season and providing out of hours closure of automated windows.
It uses a CR2032 battery in order to maintain the time and date when the
power is o to the panel. The battery should last 5 years with no power to the
panel. When the panel is powered, the battery is not used.
Inordertosatisfydierentmarkets,iNVent2isprovidedwithUTC,Coordinated
Universal Time, and Local Time. iNVent 2 will display the local time to the user
and for data logging purposes it saves the data in UTC in order to simplify the
analysis of the data, especially when daylight savings is enabled.
The BACnet module socket (A1) allows the optional BACnet module from
Cimetrics to be installed into the iNVent 2 panel in order to make system
status information available on a BACnet network, if desired by the customer.
Only BACnet/IP is supported and requires an Ethernet connection and a
static IP address. Please see the iNVent 2 - Optional BACnet module product
card for further information.
SYSTEM
SPECIFICATIONS
This section describes extra features of the iNVent 2 panel not covered by
other categories.
engineers to analyse the data in order to improve on the system performance.
2GB cards have been tested, but larger capacities should also be supported.
General Features

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SYSTEM
SPECIFICATIONS
Rain Sensor Input (Required) - (7.1)
Smoke Vent Input (Optional) - (7.4)
External Temperature Input (Required) - (7.5)
Heating Interlock Input (Optional) - (7.2)
Fire Alarm Input (Optional) - (7.3)
The Rain Sensor Input requires a normally open volt-free contact wired
between the “COM” and “NO” “Rain” terminals of J28 (upper level).
When the contact is closed the system will close the active louvres and
windows, but leave internal dampers on X-AIR systems and wall louvres in
their position based on the temperature/CO2to allow continued ventilation
in the space. If the ventilation system is a WINDCATCHER Classic or SOLA-
BOOST system, then the dampers will fully close on rain.
The Smoke Vent input requires a normally open volt-free contact wired between
the “COM” and “NO” terminals of the J33 “Smoke” terminals (upper level).
When the contact is closed all dampers, louvres, wall louvres and windows
will open to allow the escape of smoke.
The external temperature input requires a weather-proof temperature sensor
with a 0-10V output that maps to -10°C to +40°C, powered by 24V DC, connected
to J34. One such suitable sensor is the Titan Products part ref: TPVOS.
This should be located out of direct sunlight and away from any heat sources
that could aect the air temperature measurement (such as plant exhaust).
It is recommended that it is installed on a north facing façade of the building.
If it is located on any other façade it will require shielding by building soits
or by a type of solar shielding.
It is used to adjust the seasonal strategy and protect ventilation systems
against snow/frost.
The Heating Interlock input requires a normally open volt-free contact wired
between the “COM” and “NO” terminals of the J28 “Heat” terminals (lower level).
When the contact is closed the system will limit all dampers, wall louvres
and windows to a maximum of 10% open as default. This may be altered
to anything in the range of 5% to 20% in 5% increments via the iNVent 2
configurator soware.
The Fire Alarm input requires a normally open volt-free contact wired between
the “COM” and “NO” terminals of the J33 “Fire” terminals (lower level).
When the contact is closed all dampers, louvres, wall louvres and windows
will fully close.
Fault Output (Optional) - (7.6)
The fault output is a volt-free contact which when open indicates a fault has
occurred. Max rated voltage: 24V DC.
Master Controls

8
Damper/Louvre Connection (8.1)
Wall Actuator (8.2)
Fireman’s Key Swtich Input (Optional) - (7.7)
Competition Key Switch Input (Optional) - (7.8)
There are 4 physical Zone Input/Outputs which are used to control
Monodraught Natural Ventilation systems. They can be reconfigured via the
iNVent Configurator tool through the USB port to support other systems or
non-standard/new configurations. Each zone comprises of the following:
The Wall Actuator connection is used to control a Belimo actuator used
within Monodraught Ventsair systems or Window Actuator Control Units. The
terminals are wired for Ventsair units as follows, from le to right:
1. 0V DC
2. 2 - 10V Damper Control Signal
3. 2 - 10V Damper Position Feedback Signal
4. 2 - 10V Louvre Control Signal
5. 2 - 10V Louvre Position Feedback Signal
6. 24V DC Power
1. 0V DC
2. 2 - 10V Wall Actuator Control Signal
3. 2 - 10V Wall Actuator Position Feedback Signal
4. 24V DC Power
The Fireman’s Key Switch Input provides two volt-free contacts between
“COM” and “O” for open, and “COM” and “C” for close. When the “Open”
contact is closed, all dampers, louvres, wall louvres and windows will open.
When the “Close” contact is closed, all dampers, louvres, wall louvres and
windows will close. If both the “Open” and “Close” inputs are activated at the
same time by an external system, then the “Close” setting will take priority.
The system runs in normal mode when neither of the contacts are activated.
This is usually connected to a Monodraught 3-position Fire Key Switch.
The Competition Key Switch Input provides two volt-free contacts between
“COM” and “O” for open, and “COM” and “C” for close. When the “Open”
contact is closed, all dampers, louvres, wall louvres and windows will open.
When the “Close” contact is closed, all dampers, louvres, wall louvres and
windows will close to the competition mode setting between 5% and 20%
(default of 10%). If both the “Open” and “Close” inputs are activated at the
same time by an external system, then the “Close” setting will take priority.
The system runs in normal mode when neither of the contacts are activated.
This is usually connected to a Monodraught 3-position Competition Key Switch.
SYSTEM
SPECIFICATIONS
There are 4 physical Zone Input/Outputs which are used to control
Monodraught Natural Ventilation systems. They can be reconfigured via the
iNVent Configurator tool through the USB port to support other systems or
non-standard/new configurations. Each zone comprises of the following:
Zone Inputs/Outputs

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RS485 Digital Interface (8.3)
BMS I/O (9.1)
General Purpose Inputs (9.2)
Heating Solid State Relays (9.3)
Cooling Solid State Relays (9.4)
Sensor 1/2 Input (8.4)
The RS485 Digital Interface is for future support of digital communication
between Monodraught products. Currently there are no products that
support this, but this section will be updated when they have been
developed. Currently it provides 24V power and an RS485 connection over a
RJ45 terminated CAT5 cable, but MUST NOT BE CONFUSED WITH ETHERNET.
The BMS I/O connections (J17) allow the iNVent 2 panel to send or receive
signals to/from a BMS system for tighter control and integration. It provides
The general purpose inputs (J21 & J25) provide four 0-10V inputs and 24V DC
power to additional devices or sensors. These can be configured to operate
with a wide variety of sensors through the iNVent 2 configurator soware.
The iNVent 2 panel has four solid state relays (Lower terminals of J15, J18,
J22, J26) for controlling a heating system per zone. This is not currently
supported, but will be in a future release of firmware. It is a volt-free contact
rated at 24V, 1A maximum.
The iNVent 2 panel has four solid state relays (Upper terminals of J15, J18,
J22, J26) for controlling a cooling system per zone. This is not currently
supported, but will be in a future release of firmware. It is a volt-free contact
rated at 24V, 1A maximum.
The Sensor 1 and 2 inputs are used to connect to Monodraught sensors and
wall controllers, as well as any other sensors that output a 0-10V signal.
By default, Sensor 1 is configured as a Monodraught WINDCATCHER Wall
Mounted Controller, and Sensor 2 is configured as an additional 0-50°C
temperature sensor. This means that by default, iNVent 2 operates the same
way as an iNVent 1 panel.
The terminals are wired as follows, from le to right:
1. 0V DC
2. 0 - 10V Input from Sensor
3. 24V DC Power
SYSTEM
SPECIFICATIONS
four 0 - 10V outputs, and four 0 - 10V inputs which can be configured for a
variety of purposes.
An example of this is getting the BMS system to send the room temperature
that it reads and uses for the control of other systems, such as heating, to
the iNVent 2 panel so that one common measurement is used to prevent
cooling/heating system fighting or oscillation. It can also operate in reverse,
so that the BMS uses the temperature measurements that the iNVent 2 panel
measures to base the operation of other building systems on.
Additional I/O

10
CONTROL
STRATEGY
Table 1 - Damper and Louvre Operational Strategy
Season Spring Summer Autumn Winter
Start Date 01 March 01 June 01 September 01 December
Finish Date 31 May 30 August 30 November Last Day of Feb
Zone Temperature Damper Output
Up to 16°C
Dampers Closed
Dampers Closed
Dampers Closed
Dampers Closed
At 17°C Dampers Open 20%
At 18°C Dampers Open 40%
At 19°C Dampers Open 60%
At 20°C Dampers Open 20% Dampers Open 80% Dampers Open 20%
At 21°C Dampers Open 40%
Dampers Fully
Open
Dampers Open 40%
At 22°C Dampers Open 60% Dampers Open 60% Dampers Open 10%
At 23°C Dampers Open 80% Dampers Open 80% Dampers Open 20%
At 24°C Dampers Fully
Open
Dampers Fully
Open
Dampers Open 30%
At 25°C Dampers Open 40%
At 26°C Dampers Open 50%
Night-time Cooling X  X X
ActivLouvre Opening 50% 100% 50% 25%
The iNVent 2 panel uses a Seasonal Automatic Temperature Control strategy to
manage the air quality and room temperature of a zone. It varies the damper
and louvre openings of Monodraught Natural Ventilation systems based on
the internal and external temperatures, and adjusts for the current season.
The external temperature is also used to activate Frost Mode. This mode
closes the louvres if the external temperature is below 5°C in order to ensure
that the louvres do not freeze open. If the external temperature is less than
8°C and the rain sensor activates, then the system enters Snow Mode and
closes the louvres.
During hotter weather, if required, dampers can be set to close when the
internal temperature is at least 25°C and the external temperature is at least
5°C above the internal temperature. This feature is designed to prevent
a space from heating up due to higher outside air temperatures (i.e. 30°C
outside, 25°C inside).
In addition to the above control strategy the system will cycle the Active Louvre
fully each day at 2.00 am to ensure there is no dirt build up that may inhibit the
movement brought on by a long period of the louvres not actuating fully.
Further to the seasonal position of the louvres the over-ride open facility no
longer fully opens the louvres fully every time but will move the louvres to
the position of the next season as indicated in Table 3 below.
The iNVent 2 control system will adjust the active seasonal strategy depending
upon the external temperature based on the following table:
Table 2 - Seasonal Strategy Based on Noon External Temperatures
Current Calendar Season Spring Summer Autumn Winter
External Temperature (ET) Operational Season for next 24 Hours
ET < 8°C Winter Spring Winter Winter
8°C < ET < 15°C Spring Spring Autumn Winter
15°C < ET < 22°C Spring Summer Autumn Spring
ET > 22°C Summer Summer Summer Spring
Table 3 - Louvre Override Open Position vs. Season
Current Calendar Season Spring Summer Autumn Winter
Override Open Position 100% 100% 100% 50%
CO Control (requires controller within the zone to have
integrated CO sensor)
If the CO2Level in the zone exceeds 1500 ppm the system will open the
dampers 20% further than the current setting if they are currently open 20%
to 80% otherwise they open to 20%.
If aer 5 minutes the CO2level is still > 1300 ppm the dampers will open a

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CONTROL
STRATEGY
Night-time Cooling
Input Priority List
During the summer season between the hours of 00:00 and 6:00 am the
system will automatically open the dampers and Louvres in all zones where
the measured temperature is > 16°C.
This pre-cools the space ready for the next day and can reduce the peak
temperature for the following day.
There are priorities associated with each input so that certain inputs override
others, such as Fire Alarm input overriding the CO2mode. This is shown in
Table 4 below. The CO2and heating interlock priorities can be swapped via
configuration settings.
further 20%. This 20% increase every 5 minutes is repeated if the level
remains > 1300 ppm until the dampers are fully open which is where they
remain until the level drops below 1300 ppm.
Note: If the dampers are already at 100% they do not open any further.
Input Priority
1Fire Key Switch Highest
2 Fire Alarm
3Competition Switch
4 Override Open
5 Override Close
6 Rain/Snow/Frost Protection
7CO
8 Heating Interlock
9 Temperature Lowest
Additional Temperature Sensor and Averaging
Zone Usage
The Additional Temperature sensor is auto detected at power up and is
used with the integrated sensor in the zone controller (SOLA-BOOST or
WINDCATCHER) to give an average temperature in a larger zone, unless
selected otherwise using the iNVent Configurator soware.
Maximum of 3 SOLA-BOOST (Classic / X-Air) systems (Power tracks) can
be connected to one zone (controller) or a maximum of 3 WINDCATCHER
(Classic / X-Air) systems (Damper Motors) can be connected to one zone. If
the large dampers with 2 actuators are used or SUNCATCHER’s (a maximum
of 6 per Panel) are installed be aware that the system can only accommodate
a maximum of 24 Belimo’s.
Other Information

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