I'm looking to use a Sun Netra T1 onboard an aircraft where the supply
is 120 V 400 Hz
The specs on the Netra T1 are:
100 - 240 VAC, 47 - 63 Hz, 2 A (max)
Has anyone ever tried running one at 400 Hz? My guess is that it is
unlikely to be an issue, as the input voltage will soon be converted to
DC in the switch mode power supply by a bridge and capacitors. A higher
frequency should have not be an issue there, and if anything gives the
capacitors an easier time.
In article <4852a4fe@212.67.96.135>,
Dave <foo@coo.com> writes:
> I'm looking to use a Sun Netra T1 onboard an aircraft where the supply
> is 120 V 400 Hz
>
> The specs on the Netra T1 are:
>
> 100 - 240 VAC, 47 - 63 Hz, 2 A (max)
>
> Has anyone ever tried running one at 400 Hz? My guess is that it is
> unlikely to be an issue, as the input voltage will soon be converted to
> DC in the switch mode power supply by a bridge and capacitors. A higher
> frequency should have not be an issue there, and if anything gives the
> capacitors an easier time.
I don't know if that PSU has power factor correction (the
power factor isn't given in the datasheet), but if it has,
the power factor correction circuitry might not like the
higher frequency.
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
"Dave" <foo@coo.com> wrote in message news:4852a4fe@212.67.96.135...
> I'm looking to use a Sun Netra T1 onboard an aircraft where the supply
> is 120 V 400 Hz
>
> The specs on the Netra T1 are:
>
> 100 - 240 VAC, 47 - 63 Hz, 2 A (max)
Maybe get an inexpensive UPS and plug the UPS into the aircraft power.
Then you can plug the Netra T1 into the UPS.
That way the UPS will be supplying the power you expect even if the aircraft
would damage the computer.
> I'm looking to use a Sun Netra T1 onboard an aircraft where the supply
> is 120 V 400 Hz
Sounds a bit strange as most aircraft are 115V/400Hz. Besides that, this
is 3 phase. What type of airplane is it?
> The specs on the Netra T1 are:
>
> 100 - 240 VAC, 47 - 63 Hz, 2 A (max)
>
> Has anyone ever tried running one at 400 Hz?
Not a Sun Netra T1, but other similar equipment. It doesn't work.
Switching PSUs are designed for a certain AC frequency range. Your
chances are good to kill the PSU if you connect it to 400Hz.
Besides that, you should be aware that the Netra T1 isn't certified for
use in aircraft. Connecting it to aircraft power not only imposes the
risk of damaging the Netra (which wouldn't be that of a problem) but
also of causing damage of the aircraft electric systems and avionics
(and that definitely would be a problem). You can try to get your Netra
certified for that but that is very costly (i.e. you need to have a risk
assessment done). Installation must be done by certified technicians. Of
course you could try to come away with just installing it, but you
violate the airplanes airworthiness and risk prosecution.
Trinean wrote:
> "Dave" <foo@coo.com> wrote in message news:4852a4fe@212.67.96.135...
>> I'm looking to use a Sun Netra T1 onboard an aircraft where the supply
>> is 120 V 400 Hz
>>
>> The specs on the Netra T1 are:
>>
>> 100 - 240 VAC, 47 - 63 Hz, 2 A (max)
>
> Maybe get an inexpensive UPS and plug the UPS into the aircraft power.
Same issue. Find a UPS that will take 400 Hz and spit out 50 Hz.
> Then you can plug the Netra T1 into the UPS.
> That way the UPS will be supplying the power you expect even if the aircraft
> would damage the computer.
>
> Trinean
>
>
Andrew Gabriel wrote:
> In article <4852a4fe@212.67.96.135>,
> Dave <foo@coo.com> writes:
>> I'm looking to use a Sun Netra T1 onboard an aircraft where the supply
>> is 120 V 400 Hz
>>
>> The specs on the Netra T1 are:
>>
>> 100 - 240 VAC, 47 - 63 Hz, 2 A (max)
>>
>> Has anyone ever tried running one at 400 Hz? My guess is that it is
>> unlikely to be an issue, as the input voltage will soon be converted to
>> DC in the switch mode power supply by a bridge and capacitors. A higher
>> frequency should have not be an issue there, and if anything gives the
>> capacitors an easier time.
>
> I don't know if that PSU has power factor correction (the
> power factor isn't given in the datasheet), but if it has,
> the power factor correction circuitry might not like the
> higher frequency.
>
Yes, good point - that might mess things up if that exists.
Dave Uhring wrote:
> On Fri, 13 Jun 2008 17:49:01 +0100, Dave wrote:
>
>> I'm looking to use a Sun Netra T1 onboard an aircraft where the supply
>> is 120 V 400 Hz
>
> Be careful of that spec. The US Army helicopters I worked on 40 years ago
> used 117 VAC 3 phase @400 Hz.
>
I'm not saying its speced at 120 - it might be 115, but its "around"
that value. 115/117/120 - will not make a huge difference. There quite
possibly are 3 phases, but I will have one of them.
Benjamin Gawert wrote:
> * Dave:
>
>> I'm looking to use a Sun Netra T1 onboard an aircraft where the supply
>> is 120 V 400 Hz
>
> Sounds a bit strange as most aircraft are 115V/400Hz. Besides that, this
> is 3 phase. What type of airplane is it?
>
>> The specs on the Netra T1 are:
>>
>> 100 - 240 VAC, 47 - 63 Hz, 2 A (max)
>>
>> Has anyone ever tried running one at 400 Hz?
>
> Not a Sun Netra T1, but other similar equipment. It doesn't work.
> Switching PSUs are designed for a certain AC frequency range. Your
> chances are good to kill the PSU if you connect it to 400Hz.
>
Better than good I'd say!
Most commercial aircraft have either 48VDC (equipment) or 110VAC/60Hz or
220VAC/50Hz power, so you should be able to source a converter.
In comp.sys.sun.hardware Benjamin Gawert <bgawert@gmx.de> wrote:
> * Dave:
> > I'm looking to use a Sun Netra T1 onboard an aircraft where the supply
> > is 120 V 400 Hz
> Sounds a bit strange as most aircraft are 115V/400Hz. Besides that, this
> is 3 phase. What type of airplane is it?
> > The specs on the Netra T1 are:
> >
> > 100 - 240 VAC, 47 - 63 Hz, 2 A (max)
> >
> > Has anyone ever tried running one at 400 Hz?
> Not a Sun Netra T1, but other similar equipment. It doesn't work.
> Switching PSUs are designed for a certain AC frequency range. Your
> chances are good to kill the PSU if you connect it to 400Hz.
> Besides that, you should be aware that the Netra T1 isn't certified for
> use in aircraft. Connecting it to aircraft power not only imposes the
> risk of damaging the Netra (which wouldn't be that of a problem) but
> also of causing damage of the aircraft electric systems and avionics
> (and that definitely would be a problem). You can try to get your Netra
> certified for that but that is very costly (i.e. you need to have a risk
> assessment done). Installation must be done by certified technicians. Of
> course you could try to come away with just installing it, but you
> violate the airplanes airworthiness and risk prosecution.
All that depends on how the aircraft itself is certified and under
which set of rules it is going to fly.
Anyone used Sun's on 400 Hz aircraft supply? 
Linear Mode
