Server Fan Fails to Start?

[iamdarkyoshi]

I have this server fan I was planning on putting in my personal rig for the radiator fans because I have two of these and three of a fan with the same (Kinda) model number but a couple of these server fans fail to start on their own. Some start fine, some dont. I will probably not use these though as the minimum speed on them using pwm (yellow clip in video) is still quite loud.

So my main question is why doesnt this fan start every time? Bad coil in the motor? It doesnt run as fast as the others do...

[W-L]

-SNIP-

 

What voltage are you trying to start them at the maximum 12V range?

[iamdarkyoshi]

What voltage are you trying to start them at the maximum 12V range?

dirctly on 12v. If the pwm pin is not connected, the fan assumes full speed.

[W-L]

dirctly on 12v. If the pwm pin is not connected, the fan assumes full speed.

 

Yes that's correct, hard to say why the exact reason why that might be happening but looks like the motor itself is bad since it can't start up, I'm assuming they aren't new so it might have failed over it's lifetime.

[iamdarkyoshi]

Yes that's correct, hard to say why the exact reason why that might be happening but looks like the motor itself is bad since it can't start up, I'm assuming they aren't new so it might have failed over it's lifetime.

it certainly has had its use. Its from a poweredge 6600, back in the day or ddr1 memory lol. I had one more of the 6 fans do the exact same thing. Since it seems to be a position issue, I would bet that one of the coils doesnt work when it should. It tries to advance the fan but it cant, but once it has momentum, it spins fine because of another coil that does work.. My guess is that because the fans are in a stack in the server, the one right next to these defective ones managed to get them spinning and it didnt report a fan failure.

[W-L]

it certainly has had its use. Its from a poweredge 6600, back in the day or ddr1 memory lol. I had one more of the 6 fans do the exact same thing. Since it seems to be a position issue, I would bet that one of the coils doesnt work when it should. It tries to advance the fan but it cant, but once it has momentum, it spins fine because of another coil that does work.. My guess is that because the fans are in a stack in the server, the one right next to these defective ones managed to get them spinning and it didnt report a fan failure.

 

Possible since it's basically a wind tunnel in a server rack.

One thing try standing it up vertical but tie it down somewhat and see if orientation has anything to do with it. For that fans that do work though since it was flat against a surface it will spin slower than the RPM outputted by the computer due to air pressure.

[iamdarkyoshi]

Possible since it's basically a wind tunnel in a server rack.

One thing try standing it up vertical but tie it down somewhat and see if orientation has anything to do with it. For that fans that do work though since it was flat against a surface it will spin slower than the RPM outputted by the computer due to air pressure.

Thanks for the help. I have had no experiance witn "gamer" fans as I just have ones from scrap things.

Also, would these be any good on a radiator?

[W-L]

Thanks for the help. I have had no experiance witn "gamer" fans as I just have ones from scrap things.

Also, would these be any good on a radiator?

 

I personally wouldn't put them on a rad since it would be pretty loud even on idle, but if you don't mind noise a fairly dense fin array or thick rad would work well. There are some pretty good fans for a reasonable price.

[iamdarkyoshi]

I personally wouldn't put them on a rad since it would be pretty loud even on idle, but if you don't mind noise a fairly dense fin array or thick rad would work well. There are some pretty good fans for a reasonable price.

I managed to get three of the desktop version of this fan to go as lower than a couple hundred rpm. They actually work as PWM fans on 5v too, just the PWM scale is slower. My existing rad fans are no-name 3 pin fans. Fine for my CPU because my motherbosrd has 3 and 4 pin CPU fan headers, but I do want three PWM fans for my r9 390x and its triple radiator. I will use this machine for folding at night and so I will just have an "uber mode" where the computer presses down on the floor a bit harder from the amount of air coming out the top. I work as an IT at only 17 so I get free stuff often, that's where the poweredge 6600 and all these dell thingies came from. We switched to HP due to the sheer amount of dead dells so dell can go eat a dick.

[W-L]

I managed to get three of the desktop version of this fan to go as lower than a couple hundred rpm. They actually work as PWM fans on 5v too, just the PWM scale is slower. My existing rad fans are no-name 3 pin fans. Fine for my CPU because my motherbosrd has 3 and 4 pin CPU fan headers, but I do want three PWM fans for my r9 390x and its triple radiator. I will use this machine for folding at night and so I will just have an "uber mode" where the computer presses down on the floor a bit harder from the amount of air coming out the top. I work as an IT at only 17 so I get free stuff often, that's where the poweredge 6600 and all these dell thingies came from. We switched to HP due to the sheer amount of dead dells so dell can go eat a dick.

 

Well in that case as long as the fans have good static pressure but I assume you are doing a custom loop or GPU bracket with a 360mm AIO since the R9, 390X only come in a single 120mm rad.

[iamdarkyoshi]

Well in that case as long as the fans have good static pressure but I assume you are doing a custom loop or GPU bracket with a 360mm AIO since the R9, 390X only come in a single 120mm rad.

Its a custom loop. I have an xfx 390x and the layout is the same as a reference 290x so waterblocks have already been made. I got the w/c case from work. Its a cosmos with a casemodded double and triple 120mm rad with duel pumps and res. I would assume static pressure is decent as the sp fans seem to have larger blades.