48v Fan Power & Controller - Are they available

foz182

foz182

foz182

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9 Jan 2012
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Managed to get a hold of some Sanyo Denki 48v Fans, was wondering how to run them at full power (Experiment) as ATX only have 12v on molex, ive seen these voltage step up things on youtube that supposedly do a okay job from 12v to 48v. Say i get this far, how about PWM control. All fan controllers that are on sale are 12v rated, what would happen it i used a 12v fan controller with 48v.Too many questions I know sorry.Just really want to see these run at full speed. Any help guys/gals?
 
Use 12v on 48v and the fan will run at roughly 1/4 speed.

As for PWM. That'll depend on what the control circuit requires. 12v fans typically need a 5v control signal. What does a 48v fan require? Check the fan you have got hold of.

You'd need a boost converter that is sufficient to deliver the amount of current the fan requires at 48v. It could well be several Amps so your input current would need to be >4x that.

And finally why would you even want a 48v fan? I looked at one and it was >10,000rpm. That fan will shred fingers and ear drums.
 
Can't see a min voltage for the control signal but most of them seem to state ~30V max (some 48V are rated 60V max for the control signal) and specify a resistor is used to keep amperage below 5-10ma.

The fan amperage seems to be anywhere from 0.2 to 5.6amp depending on model.

Simplest way to run em full speed is probably a DEOK 12/48V boost converter board as most are rated to ~6amp - though from my experience they aren't quite as capable as the specs list i.e. the 100Watt ones will handle more like 65watt before nasty things start to happen.
 
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If those Sanyo fans are anything like Delta fans, I would bolt them down somewhere very secure before letting rip with the voltage. :eek:
 
Sorry for late reply thanks for all replies, have grabbed a 48v switched power supply to try these out on as I dont want anything to happen to my PSU. If I were to avoid PWM control how about an old skool ceramic rheostat. 100ohm at 100W?
 
Oh by the way tried them at 12v and nothing happened, no data sheet available for these by the way, either that or their all bad (sad face).(Sanyo Denki 109L1448MB505 140mm)
 
40.8V to 55.2V on the one I found (so basically the same) - dunno if that is the start voltage as well or just the recommended operation range.

Their datasheets seem to be kind of random on what information is and isn't there.
 
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