EXact2 control system, VEX300T

EXact2 control system

Behind the simple operating panel, the advanced EXact2 control system ensures optimum operating economy. The control system is easily matched to the daily rhythms of the user location, e.g. school, office or home.

EXact2 control system features

- Simple operation
- Three user modes, two with access codes (technician and specialist)
- Several indoor climate levels and a built-in weekly timer allows on-demand ventilation
- See more selected functions in the function overview.

Operation of the control system

The EXact2 control system can be operated from the control panel (see section "HMI control panel" below), BMS or a web server via a network or WAP (Wireless Access Point).

Wireless Access Point (WAP)

WAP is a small WIFI router mounted inside the control system in the unit. It allows the web server to be accessed wirelessly via PC, smartphone or tablet, so the unit can be configured quickly and easily via mobile platforms.

EXact2

HMI2-350-TOUCH control panel

The control panel is a touch panel that provides access to the standard daily operating interface.

Technicians and specialists can access the more advanced menus and parameters via a 4-digit password.

User interface

The user menu is for daily operations. It shows visual symbols to indicate the unit's status and provide information. The interface allows the user to temporarily change the temperature and ventilation level. The very useful help texts displayed in the yellow area minimise the need for manuals and instructions. Help texts are available  in both technician and specialist modes. Alarms are shown by a bell in the display. You can click on from here to get information about the specific alarm.

Display icons

Display information is much easier to understand because of the simple graphical elements.

	Menu Press to view menu
	Temperature/ventilation level Temperature and ventilation levels can easily and quickly be changed temporarily. Set points are shown together with visual symbols in the display.
	Alarm/warning The EXact2 control system will generate a warning symbol if it detects operational disturbances. The display will show an alarm bell if more serious disturbances have been detected.
	External stop If the ventilation system has been stopped by an external start/stop signal, this symbol will appear in the display.
	De-icing If the built-in de-icing function is in operation, this symbol will appear in the display.
	Manual operation The EXact control system can be operated in manual mode. When operating in manual mode, the hand symbol will appear in the display.
	Weekly plan When operating with the weekly plan activated, the clock symbol will appear in the display.
	Override When temperature and ventilation level set points are changed, the override symbol will appear in the display while the settings are overridden by the next change in the weekly plan.
	BMS BMS-controlled operation.
	AUX Externally-controlled operation.
	Summer/winter The Exact2 control system automatically changes from summer time to winter time. The symbol indicates either summer time or winter time.
	Fire Fire thermostat(s)/smoke detector activated
	Service Service display connected.
	Disconnect No communication on the external BUS or communication between the VEX and HMI is disconnected.

Web server

The EXact2 control system is supplied as standard without Web server. Purchase of the Web server gives access to the following additional features:

1. The unit can be monitored and configured using a local PC.
2. The unit can be connected to a local area network (LAN) and controlled by a PC connected to the LAN.
3. The unit can be connected to the internet and controlled by external PCs.

The only requirement is that the connected PC has a browser The Web server is password protected.

The Web server user interface is designed in the same logical fashion as the control panel. Uniformity makes the system easy to use. The overview display is configured and ready to monitor the ventilation system. The Web server can send an email in the event of an alarm, log data, etc.

Connection to BMS unit

As standard, the Web server can communicate with Modbus RTU RS485, BACnet MSTP or BACnet IP. Thus, a BMS unit that uses one of these communication platforms can be easily connected to the unit.

Converting to other protocols

Via the Web server, the units can be connected to other BMS units with other protocols via a converter (gateway). If the converter has been purchased, the following options are available:

1.    MLON - Module for converting to LON
2.    MTCP - Module for converting to Modbus TCP/IP

Try the EXact2 control system online

Try out the EXact2 control system online and control a VEX340 unit installed at EXHAUSTO in Langeskov.

This unit is free-standing and without duct system connections.

The control system is accessible at http://exact.exhausto.dk:8340/

For technician mode use the following:

User name: VEX340
Access code: 1111

NB Only one user can be logged in at a time.

VEX300T

EXact2

IHCW for HW - Internal water heating coil

IHCE for HE - Internal electric heating coil

MXHP for DX (internal cooling-heating coil - coolant)

MCOCW for CW - as changeover cooling/heating coil

MXCU - Control module for external cooling unit

VEX300T

The simplified drawings show components that can be included in a VEX300T air handling unit.

Standard and accessory components

The VEX300T series is supplied with a range of components fitted in the unit or for fitting in the duct system and in the appropriate room. The table below shows the standard components and accessories in the VEX300T range. Accessories must be ordered separately.

** Select between HW, CW, DX or HE

VEX300T

The electrician installing the unit is responsible for ensuring that all sizes used are compatible with current legislation and regulations.

The VEX heat recovery unit has a built-in isolation switch.

Maximum short circuit current (Icu), in accordance with EN60947.2 is 10 kA
Maximum protection is shown in the table in "Electrical guide for VEX300T".

Maximum phase current is the dimensioned current for choice of cable. 

Fitting of RCCBs

RCCBs must be of a type that meets the following requirements:

VEX300T
PFI type A breaker that breaks the circuit when a residual current with DC content (pulsating DC) in accordance with EN 61008 is registered.

Disconnection time must be max. 0.3 s. 

The current leakage can be up to 100 mA.

VEX300T