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The noise and power of the fan are directly related to the output performance of the fan. If additional CFM is needed, there will also be an increase in noise and power. In this world there is no free lunch. But what if we can reduce the amount of CFM during times when system loads are minimal. During these times, we can reduce the CFM and consequently decrease the emitted noise and the power requirements. If the load increases, we can increase the CFM to meet the cooling requirements. The result is a win-win situation for today's thermal cooling needs.
There are many ways to control the speed of a fan. Controlling the fan speed can be as simple as regulating the input voltage to the fan using more complicated digital microprocessor inputs. These methods are discussed below and we offer guidelines to follow when considering each option for your application.
VOLTAGE REGULATION
The voltage regulation option is designed for applications where input power can fluctuate at different voltage levels. An example would be a backup generator, or outdoor telecommunication equipment that periodically undergoes regeneration of the battery. In these applications, a change in input voltage would result in a change in fan rpm and therefore in noise and power.
To avoid unwanted fluctuations, the Comair Rotron fans can be equipped with an internal regulating circuit which maintains a constant voltage source in the fan windings; regardless of how the input voltage changes. This is achieved by using a voltage regulator and holding the adjustment leg with a zener diode. See Figure 1. Everything is built into the fan. There are no additional components or additional cables to deal with in your system. Comair's solution is simple and easy.