Feature Climate control width modulated (PWM) signal.
Alternatively, a thermistor that accepts a 10V DC supply, which may be taken directly from the EC motor, may be used to provide a signal, in the voltage range 0-10V DC, to control the speed of the fan. An effective yet simple and inexpensive solution.
A tacho-signal output allows direct monitoring of the fan speed, and there- fore a malfunction or failure may be immediately signalled. The operator
‘Developments in energy efficient fan-and-filter units for
climate control in enclosures show that upcoming energy efficiency guidelines are not only met but easily exceeded, by using electronically commutated (EC) motors’
can react immediately, not just when the temperature inside the enclosure rises above any alarm level, therefore minimising the risk of component
failure in the enclosure and reducing system downtime.
Should the The TopTherm fan-and-filter unit range
environment permit the use of such a solution, then a fan-and-filter unit, with a combination of fan and dust filter, will provide a means of cooling that has minimal operating costs
There may be applications in which the ambient conditions do not lend themselves to a solution that directly uses ambient air as a means of enclosure cooling. In such instances, either cooling units or air-to-water heat exchangers may be considered. Improvements have also recently been made to this type of cooling technology. Although by no means new, the door switch is worthy of mention at this point as a fundamental control method. Whatever the type of cooling solution, there is typically no need for the switch to continue operating when the enclosure door has been opened. Should the climate control system remain operational upon opening the door then it is no longer merely main- taining the internal temperature, it is trying to maintain the temperature of the environment around the enclosure as well – a needless use of energy. Software that employs an intelli- gent strategy to effectively target the use of energy may be integrated into both cooling units and air-to-water heat exchangers. Such software may, for example, disable the internal fan when the temperature inside the enclosure falls to 10˚C below the level desired, enabling it for a period of 30 seconds every 10 minutes to ensure
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