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...
Forum Discussion
After some usage, I can report it didn't get all the noise out-it did reduce it by more than half. You may want to experiment with capacitor size. Seemed like I settled on a 2600 uF capacitor across the fan-by switching the capacitor in and out and comparing sound. I have not tried a much larger capacitor..Be careful when experimenting with the fan. The fan's power is less than 12 volts, but to ground it gave me a little bite.
Otherwise I like the power supply. If someone has success with a much larger capacitor I'll try that. If not, I may determine how fast the fan runs under full supply output and simply have the fans switch on with 120 volt power (possible relay or wall wart-possible fans in series) and run continuously at that speed. To me the intermittent humming and clicking sounds are less desirable than a steady fan whir. As it stands, the fans have only run up to about half the time at a very low speed-but then I've only drawn about 15 amps max from the power supply. Both fans are in parallel FWIW.
On my unit, the fans are completely silent at output of about 5-6 amps or less. I have not had enough load on the supply for the fans to run continuously (which also stops the objectionable sounds).
Otherwise I like the power supply. If someone has success with a much larger capacitor I'll try that. If not, I may determine how fast the fan runs under full supply output and simply have the fans switch on with 120 volt power (possible relay or wall wart-possible fans in series) and run continuously at that speed. To me the intermittent humming and clicking sounds are less desirable than a steady fan whir. As it stands, the fans have only run up to about half the time at a very low speed-but then I've only drawn about 15 amps max from the power supply. Both fans are in parallel FWIW.
On my unit, the fans are completely silent at output of about 5-6 amps or less. I have not had enough load on the supply for the fans to run continuously (which also stops the objectionable sounds).
