BS EN () and the use of VSDs for smoke control systems. A picture of some inverter drives. Inverter drives are commonly used in smoke control. Details are given for methods of test and the requirements for powered smoke and heat control ventilators (fans) which can be installed in ventilation systems. BSRIA. Page 3 of Report /3 Edition 2. CE Marking to BS EN ºC/2 Hrs, PWA range. Foot mount motors. Carried out for.
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Inverter drives are commonly used in smoke control applications.
Inverter drives also known as variable speed drives or VSDs are commonly used in smoke control applications to limit and modulate fan speed to suit a particular system design. For example, when using smoke extract to protect escape lobbies it is common to vary the speed of the fan according to the pressure in the lobby to prevent the lobby becoming depressurised which could make it difficult to open exit doors. VSDs also provide useful soft-start functionality to reduce large fan start-up currents reducing stress on essential power supply networks and generators.
BS EN () and the use of VSDs for smoke control systems – SCS Group
The use of inverters in emergency conditions has long been a topic of conversation within the industry. Many manufacturers provide a fire mode option that disables the control functions and motor protection in an emergency and allows the motors to run to destruction if necessary; however, as there have been very few tests carried out under fire conditions there is a lack of certainty about their performance.
The system has a bypass facility to switch from inverter control to DOL during smoke control mode. This combination is certified under BS EN Output filters provide additional protection to motor insulation.
Bypass Bypass systems can be used to run fans DOL only for systems in which fans always run at full speed e. Pressure control systems relying on fan speed modulation are unable to comply with this condition. The most practical option, from a system integration point of view, would be to use a fully tested and certified matched smoke vent fan and VSD solution, which fully complies with EN Using this approach would allow fan and VCD selection methods to remain un-changed, meaning that installers and system designers would then not be forced to accommodate larger motors, fans or additional 12101- equipment into their design.
Of the three options mentioned, this is the most readily applicable from a practical point of view. What remains to be seen is whether clients and specifiers appreciate that systems will become more costly due to the need for expensive VSD filters, oversized fan motors and increased power supplies and that plant space requirements needed to accommodate fans and control panels will need to be increased.
Once this is appreciated, the appeal and advantage of using a fully tested and certified matched smoke vent fan and VSD solution should then be recognised.
BS EN 12101-3:2015
The effect of these changes on some common smoke ventilation systems are summarised in the following table:. Click image to download a PDF of this article to read or print later.
With so many 1210-3 control systems currently being specified or at design stage, the industry requires immediate clarity from the eb authority to advise how they intend to enforce the new rules.
Smoke vent specialists should be approaching clients and specifiers to provide early warning of the impending cost increases resulting from the use of certain types of systems. For a copy of this article in PDF format, ready for you to read or print later, please click here.
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