The overwhelming majority of medium to high-power AC-DC power provides have integral followers which might be required to maintain their internal elements at protected working temperatures. Since followers are electro-mechanical units they're topic to wear down sooner than some other part in the power provide.
The chart and diagram beneath illustrate this very effectively. As may be seen from the chart, if a power provide’s fan is operated with a high exhaust air temperature at maybe 80°C (176°F) its life expectancy could also be a brief as 1.5 years. Nevertheless, by lowering the exhaust air temperature (as measured 2-inches away) to maybe 40°C (104°F) the fan’s life expectancy might now exceed 5 years.
Clearly the necessities of a selected application might require completely different working temperatures. Nevertheless, every time doable, decreasing the working temperature of the power provide will enhance the life of the fan in addition to the elements inside the provide. Additionally, by derating a power provide beneath its most power ranking can have a direct impact on its internally generated warmth and, due to this fact, its exhausted air temperature, which is able to prolong the life of its fan.
Positioning the power provide so cooler air is drawn in via the power provide from outdoors of the system may even assist.
Additionally, a power provide fan’s life will naturally be prolonged if the provide is turned off when not wanted. Some of the newer followers are thermally managed in order that they flip on and off mechanically. There are additionally variable-speed followers that enhance or lower the fan’s velocity relying upon the sensed ambient temperature or the load required of the power provide. These have the benefit of extending the fan’s life in addition to lowering the audible noise when the load present is low.
One other vital issue for fan life maximization is to maintain the space round the power provide (inlet and outlet) as free of mud and dust as doable. Mud, metallic and chemical particulates can typically kill a fan faster than high temperatures.
If a fan begins making squeaking sounds, it’s a very good indication that it ought to be changed very quickly, earlier than it freezes up. Fan replacements ought to solely be finished by certified digital technicians who're conversant in the high voltages that may exist inside power provides even after the AC power is eliminated.