The PowerConnect 5548P is pretty loud, mainly due to the 600 watt PSU inside. Taking the switch apart, there are two fans on the back of the unit, and two fans inside the PSU. The PSU fans make most of the noise in the unit, so I decided to replace them with two Noctua NF-A4x20 FLX 40mm Case Fans. The problem, I found, was that the fans would not spin when the PSU was powered on, since the PSU only supplied 6v (instead of the 12v it was rated at).
Instead, I replaced the the fans on the back of the unit with the Noctua fans, and used those fans to replace the PSU fans. The wires need to be adjusted for the fans to work. Below is the correct pin layout.
The Noctuas also produce WAY less CFM than the stock fans. So please bare that in mind. I have an extra PSU in case this one burns out.
As far as temperatures go, I have a 5524 (non-POE/stock) unit, that runs at about the same temperature (about 50C). The only difference is that the unit is set to power up the fans at 50C and turn them off at 40C (So the unit will get up to 50, turn on the fans until it gets back to 40, and keep them off until the temps go back to 50.), and the 5548P never seems to get under 40 to turn off the fans. This means that the fans are constantly running (but quiet).
Yes, I should have taken WAY more pictures of the inside of the unit.
80 mm fans or 40 mm?
40mm, I updated the model number… I think I ordered a bunch of fans at the same time and copied/pasted the wrong model!
Do you think the airflow of stock fans (in the back of unit) is enough to cool down the PSU assuming 1/2 devices powered over POE? I have a 5524p and I would like to do the same you did. In my case PSU stock fans have 24 CFM while unit fans have 18CFM.
I have 5 devices that are getting POE power, the dashboard says the devices are getting a total of 19W. Currently the switch is at 60 degrees C. So, It’s probably running too hot. When I initially updated the switch, I was assuming 2 APs, and it was running at a consistent 50 degrees C. Now I have 2 APs and 3 cameras…
Ok I was two worried about to set a fire for the moment I can keep a configuration similar to yours and verify the temperature during the use of unit. Thanks !
Great work. In my case I have a 5524P: I would swap the PSU fans with unit stock fans and replace them with the same Noctua. I just noticed that the stock PSU fans have an airflow of 24 CFM while the unit stock fans have 18 CFM. Do you think it is enough to cool down the PSU assuming 2 devices powered over POE?