Labcontrol TCU-LON-II
Areas of application:
The main area of application of the TCU-LON-II digital controller is in laboratories and hospitals. In laboratories it may be used as a fume cupboard controller with monitoring function and as a room balance controller. Pressure control is often required in hospitals to control septic and aseptic areas – this can be implemented without problem.
Types of Operation:
The TCU-LON-II controller is combined with a volume flow control unit, consisting of an actuator and damper, for use as a fume cupboard controller or room balance controller.
A distinction is made between the following types of operation:
Communication system: LON bus
Information is exchanged between the individual TCU-LON-II system components of a room solution on a LON bus system using standard network variables. From the electrical point of view, all control components are connected via a twisted pair cable (LON bus). A software tool is used to create the “binding” which integrates the control components functionally. The system integrator here links the system parameters required to fulfil the control function and to implement certain operating and alarm signalling modes.
Advantages of the LON bus communication system:
The actual volume flow values from 16 fume cupboards, room control units or other extractor sources can be connected as standard via LON network variables.
Scope of fume cupboard control functions:
The fume cupboards with variable volume flows are regulated in accordance with all the requirements of EN 14175 and the ASHRAE Standard. The extract volume flow required is adapted automatically to the opening of the sash window thanks to the contact less and wear-free determination of the face velocity. It does not matter whether the sash window is only slightly raised, or a horizontal sliding sash is used. Control is very precise, extraordinarily quick and hence in addition to its high level of safety offers very economic operation.
Monitoring of the face velocity of the volume flow is also built in with acoustic and visual alarms. In addition to the operational reliability, the strengths of the system is based on the ease of installation of the associated components and many options for adapting the system to customer’s wishes.
Some of the options and extensions are listed below:
The TCU-II controller can be used in conjunction with variable volume flow control units to control variable supply or exhaust air flow in the room. The control rate is corresponding to the fume cupboards, thus enabling a stable room balance.
The actual volume flow values from 16 fume cupboards, room control units or other extractor sources can be connected as standard via LON network variables.
The addition function that is always provided on the TCU-LON-II fume cupboard control units may be used for a greater number of signals to be balanced. Any number of volume flows can be integrated by cascading the signals.
Volume flows that are not measured, such as the constant extraction from chemicals cupboards may be configured in the software and then included in the room balance. The room control loop is influenced by all the actual volume flow rates in such a way that the transfer flow required in accordance with DIN 1946 Part 7 is always ensured.
Volume flow control operates independently of the pressure in the duct, i.e. pressure fluctuations do not result in lasting changes to the volume flow. Temperature and room pressure may also be incorporated via the analogue inputs.
Scope of room pressure control functions:
An association of room balance and room pressure control is possible as a variant on room balance regulation. This is done by determining the exhaust air volume flows connected to the room control unit and using them to balance the room extract and supply air flows required. In addition, the room pressure signal is connected and has an influence on the volume flow set point value, in cascading regulation, to control the room pressure. Compared to a pure room pressure regulation, this process takes account of the volume flow balance in the room so that this system also operates stable when the opening of the door is changing. The desired transfer flow is retained in this case. It is possible to configure a change between over pressure and underpressure.
Configuration:
The controllers are configured at the factory with project-specific basic setting data. Commissioning by specialist personnel is required for correct operation, as the control unit can only be configured to the specific circumstances in the room once on site.
The main area of application of the TCU-LON-II digital controller is in laboratories and hospitals. In laboratories it may be used as a fume cupboard controller with monitoring function and as a room balance controller. Pressure control is often required in hospitals to control septic and aseptic areas – this can be implemented without problem.
Types of Operation:
The TCU-LON-II controller is combined with a volume flow control unit, consisting of an actuator and damper, for use as a fume cupboard controller or room balance controller.
A distinction is made between the following types of operation:
- Control of a fume cupboard with variable volume flow
- Control of a variable supply volume flow
- Control of a variable exhaust volume flow
- Control of a room balance and pressure or temperature control in a cascade
Communication system: LON bus
Information is exchanged between the individual TCU-LON-II system components of a room solution on a LON bus system using standard network variables. From the electrical point of view, all control components are connected via a twisted pair cable (LON bus). A software tool is used to create the “binding” which integrates the control components functionally. The system integrator here links the system parameters required to fulfil the control function and to implement certain operating and alarm signalling modes.
Advantages of the LON bus communication system:
- Reduced cost of electrical installation thanks to the bus system
- Simple integration of the room solution into a host building management system
- Implementation of centralised operating mode changes and alarm forwarding
- Centralised access to all control systems at one point in the bus system
The actual volume flow values from 16 fume cupboards, room control units or other extractor sources can be connected as standard via LON network variables.
Scope of fume cupboard control functions:
The fume cupboards with variable volume flows are regulated in accordance with all the requirements of EN 14175 and the ASHRAE Standard. The extract volume flow required is adapted automatically to the opening of the sash window thanks to the contact less and wear-free determination of the face velocity. It does not matter whether the sash window is only slightly raised, or a horizontal sliding sash is used. Control is very precise, extraordinarily quick and hence in addition to its high level of safety offers very economic operation.
Monitoring of the face velocity of the volume flow is also built in with acoustic and visual alarms. In addition to the operational reliability, the strengths of the system is based on the ease of installation of the associated components and many options for adapting the system to customer’s wishes.
Some of the options and extensions are listed below:
- switch contact for sash opening >500mm in accordance with EN1475
- Monitoring mode: volume flow or face velocity
- Configurable visual and acoustic alarm triggering: Type and duration of alarm Suppression of the alarm in reduced mode Alarm forwarding to the building management system (BMS)
- Changeover of the volume flow set point values Full shut-off, reduced mode, normal operation, emergency operation
- Integration of a motion sensor
- Integration of the fume cupboard controller into the supply and exhaust air volume flow control for the laboratory, taking diversity factors into consideration
The TCU-II controller can be used in conjunction with variable volume flow control units to control variable supply or exhaust air flow in the room. The control rate is corresponding to the fume cupboards, thus enabling a stable room balance.
The actual volume flow values from 16 fume cupboards, room control units or other extractor sources can be connected as standard via LON network variables.
The addition function that is always provided on the TCU-LON-II fume cupboard control units may be used for a greater number of signals to be balanced. Any number of volume flows can be integrated by cascading the signals.
Volume flows that are not measured, such as the constant extraction from chemicals cupboards may be configured in the software and then included in the room balance. The room control loop is influenced by all the actual volume flow rates in such a way that the transfer flow required in accordance with DIN 1946 Part 7 is always ensured.
Volume flow control operates independently of the pressure in the duct, i.e. pressure fluctuations do not result in lasting changes to the volume flow. Temperature and room pressure may also be incorporated via the analogue inputs.
Scope of room pressure control functions:
An association of room balance and room pressure control is possible as a variant on room balance regulation. This is done by determining the exhaust air volume flows connected to the room control unit and using them to balance the room extract and supply air flows required. In addition, the room pressure signal is connected and has an influence on the volume flow set point value, in cascading regulation, to control the room pressure. Compared to a pure room pressure regulation, this process takes account of the volume flow balance in the room so that this system also operates stable when the opening of the door is changing. The desired transfer flow is retained in this case. It is possible to configure a change between over pressure and underpressure.
Configuration:
The controllers are configured at the factory with project-specific basic setting data. Commissioning by specialist personnel is required for correct operation, as the control unit can only be configured to the specific circumstances in the room once on site.
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