I have been using the CRS326-24S+2Q+RM switch for several years now and have noticed that when paired with S+RJ10 modules, these modules get terribly hot. Several modules burn out in a year. I would like to replace the fans inside the case with more powerful ones, 30mm deep, which should fit. However, these fans require about 0.8A of current, while the original ones have a current of 0.16A. I am worried that such a difference may lead to damage to the switch motherboard if the 4-pin connectors of motherboard are not designed for such a current. What is the maximum current rating of the fan connector?
UPDATE:
MikroTik support team said "These connectors are rated up to 2A 250V AC/DC.". So, I buy two different 40x40x28 mm fans with 0.66A and 0.72A. One installed fan decrease temperature from 85-90 to 65-70 Celsius. Both fans decrease temp to 50-55 Celsius degree.
They're actually quite noisy, but they're audible compared to other nodes in the cluster simply because of their different tone. As expected, the internal fan placement radically solves the overheating issue, as this model draws air only through the SFP ports.
This isn't public data; you'll need to contact MikroTik support directly.
I think it should handle up to ~0.4A without any issues, but an official response is better.
(Besides, it's no longer under warranty anyway.)
Internal fans are not enough as stream around SFP cages is too low. Air has to be pushed directly on them.
Even copper heatpipes attached to external parts of RJ SFP do not help. Check my tests: sfp-sfpplus1 high temperature warning! - #3 by BAT
I would recommend AOC cables instead of copper ones. Almost no heat and there is almost no length problem.
The original ones are 12V, I plan to install the same ones, but with greater depth and current. Unfortunately, I haven't looked at what brand and what flow the original fans give, I'll take a look in a few days. Maybe I'll be able to find fans with the same current parameters, but a greater air flow due to the greater depth of the fan.
Thanks for the links, the monsters with heatsinks made me laugh. I'm doing about the same myself, powering simple 120mm fans from the compute node above switch. But I wanted a more adequate solution, since blowing the outer part of the modules does little, you need to pump air through the ports and the case.
It depends on how the power is delivered to these connectors. If there are thick traces directly from PSU connectors, there will be no problems. Connectors themselves can handle this current (and much more) easily.
But are you sure you need these 0.8 A FANs? They are usually loud as hell and probably won't give a significant result. I think it would be more effective to place one of the FANs so, that it will blow directly on SFP ports.
CRS326 has 3-pin DC voltage controlled fans. It means they are not directly fed by PSU and the limit is determined by whatever controls fan voltage.
It has 3 fans and I can see 4th header in pictures. I wouldn't expect it to have much more headroom than for 4 fans * 0.16A max + 25% ~ 0.8A. Maybe 1A if you're feeling lucky. That means 0.3A on 3 headers while really pushing it.
If you can see what's written on the controller that feeds fans you can probably find exact spec.
