Fan buzz progressive dynamics 4645-
I've installed two of these converters (orig and replacement). Both exhibit buzzing variable speed fans. 1. Nothing wrong with the fans themselves-when they operate, they're quiet. 2. Occurs wh...
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I installed a Noctua fan in the front position. These are a premium priced case fan, supposedly quiet, and have rubberized mounting points which may cut noise.
Not thoroughly tested-but I confirmed it worked. Running on generator is not quiet enough to judge sound of converter fans. It takes a camping trip for that.
The Sunon remains in the rear position, cools big heatsink and blows air into the case from a side vent. The front fan (installed Noctua) expels air from the case through front vent.
The Noctua Fan requires slightly higher voltage to start. It appears the sensor for the fans is on the heatsink. Therefore the Sunon (rear) fan starts and runs prior to starting of the new front Noctua fan. In fact it's duty cycle appears to be greater now and may operate in a cleaner quiet zone of speed. The front fan will come on if things warm up sufficiently.
These are 80 MM computer case fans. The PD factory fans have two wires. Many other case fans have three or four wires. The extra wires are used for tachometer or speed control (or both). The Noctua fan is four wire fan. The black is ground and the yellow is 12 volt for those who want to run it from the two wire terminals on the PD board.
Anyway this is not real useful for reporting a solution to the noise, but may be useful as background info..
Not thoroughly tested-but I confirmed it worked. Running on generator is not quiet enough to judge sound of converter fans. It takes a camping trip for that.
The Sunon remains in the rear position, cools big heatsink and blows air into the case from a side vent. The front fan (installed Noctua) expels air from the case through front vent.
The Noctua Fan requires slightly higher voltage to start. It appears the sensor for the fans is on the heatsink. Therefore the Sunon (rear) fan starts and runs prior to starting of the new front Noctua fan. In fact it's duty cycle appears to be greater now and may operate in a cleaner quiet zone of speed. The front fan will come on if things warm up sufficiently.
These are 80 MM computer case fans. The PD factory fans have two wires. Many other case fans have three or four wires. The extra wires are used for tachometer or speed control (or both). The Noctua fan is four wire fan. The black is ground and the yellow is 12 volt for those who want to run it from the two wire terminals on the PD board.
Anyway this is not real useful for reporting a solution to the noise, but may be useful as background info..
