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dstroud(at)storm.ca
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 Posted: Mon Dec 10, 2007 6:47 am Post subject: Joint use of two power converters |
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Lads, thanks to Bob's lead to existing diagrams and timely input
from several listers, I've decided to forge ahead with my own
wiring diagram/system.
Due to equipment already on hand, I will be running 28v for most
requirements and power down to 14v via two Collins PWC 150
power converters to run the radio, transponder and turn coordinator.
These converters take in 28 v and output 14v 5amp and 2 amps
each. There's no handy way to mount a fuse between their outputs
and the end user and I do have two very nice auto style fuse holders
on hand that I was intending to use as a 28v and 14v bus bar. The
+ input on these fuse holders is a single item leading to all + sides
of the fuses. Therefore, the question is, does anyone know if both
outputs of both converters can be "ganged together" as a common
+ input to the 14v fuse holder/bus and collectively provide a 14 amp
service? This would simplify fusing the radio, tpdr and turn coordinator
and maybe even provide service for a spare.
I dragged the net but found no info on ganging together the outputs of
these converters.
Thanks.
David Stroud Ottawa, Canada
C-FDWS Christavia
Fairchild 51 under construction
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nuckolls.bob(at)cox.net
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| Posted: Mon Dec 10, 2007 9:08 am Post subject: Joint use of two power converters |
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At 09:45 AM 12/10/2007 -0500, you wrote:
| Quote: |
Lads, thanks to Bob's lead to existing diagrams and timely input
from several listers, I've decided to forge ahead with my own
wiring diagram/system.
Due to equipment already on hand, I will be running 28v for most
requirements and power down to 14v via two Collins PWC 150
power converters to run the radio, transponder and turn coordinator.
These converters take in 28 v and output 14v 5amp and 2 amps
each. There's no handy way to mount a fuse between their outputs
and the end user and I do have two very nice auto style fuse holders
on hand that I was intending to use as a 28v and 14v bus bar. The
+ input on these fuse holders is a single item leading to all + sides
of the fuses. Therefore, the question is, does anyone know if both
outputs of both converters can be "ganged together" as a common
+ input to the 14v fuse holder/bus and collectively provide a 14 amp
service? This would simplify fusing the radio, tpdr and turn coordinator
and maybe even provide service for a spare.
I dragged the net but found no info on ganging together the outputs of
these converters.
|
What is the make and part number of these converters. Depending
on manufacturer's recommendations, they may not run well in
parallel. Also, consider that any single converter is a single
point of failure for all the devices that depend on its functionality.
You might want to consider a single converter for each device.
Let's see what devices you have in hand at the moment and
go from there.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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mprather(at)spro.net
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| Posted: Mon Dec 10, 2007 10:08 am Post subject: Joint use of two power converters |
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Here's a high level description:
http://www.seaerospace.com/collins/pwc150.htm
Matt-
| Quote: |
<nuckolls.bob(at)cox.net>
At 09:45 AM 12/10/2007 -0500, you wrote:
>
> <dstroud(at)storm.ca>
>
>Lads, thanks to Bob's lead to existing diagrams and timely input
>from several listers, I've decided to forge ahead with my own
>wiring diagram/system.
>
>Due to equipment already on hand, I will be running 28v for most
>requirements and power down to 14v via two Collins PWC 150
>power converters to run the radio, transponder and turn coordinator.
>These converters take in 28 v and output 14v 5amp and 2 amps
>each. There's no handy way to mount a fuse between their outputs
>and the end user and I do have two very nice auto style fuse holders
>on hand that I was intending to use as a 28v and 14v bus bar. The
>+ input on these fuse holders is a single item leading to all + sides
>of the fuses. Therefore, the question is, does anyone know if both
>outputs of both converters can be "ganged together" as a common
>+ input to the 14v fuse holder/bus and collectively provide a 14 amp
>service? This would simplify fusing the radio, tpdr and turn coordinator
>and maybe even provide service for a spare.
>
>I dragged the net but found no info on ganging together the outputs of
>these converters.
What is the make and part number of these converters. Depending
on manufacturer's recommendations, they may not run well in
parallel. Also, consider that any single converter is a single
point of failure for all the devices that depend on its functionality.
You might want to consider a single converter for each device.
Let's see what devices you have in hand at the moment and
go from there.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
|
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mprather(at)spro.net
Guest
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| Posted: Mon Dec 10, 2007 11:37 am Post subject: Joint use of two power converters |
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|
Follow-on question:
Would the outputs of these converters need to be fused? Since they are
regulated supplies, I'd guess that they probably have some sort of short
circuit protection built in. Worst case, if you fault the output, you'll
only get something not too much over the rated current. It's not like
faulting a connection to a battery.
Regards,
Matt-
| Quote: |
<nuckolls.bob(at)cox.net>
At 09:45 AM 12/10/2007 -0500, you wrote:
>
> <dstroud(at)storm.ca>
>
>Lads, thanks to Bob's lead to existing diagrams and timely input
>from several listers, I've decided to forge ahead with my own
>wiring diagram/system.
>
>Due to equipment already on hand, I will be running 28v for most
>requirements and power down to 14v via two Collins PWC 150
>power converters to run the radio, transponder and turn coordinator.
>These converters take in 28 v and output 14v 5amp and 2 amps
>each. There's no handy way to mount a fuse between their outputs
>and the end user and I do have two very nice auto style fuse holders
>on hand that I was intending to use as a 28v and 14v bus bar. The
>+ input on these fuse holders is a single item leading to all + sides
>of the fuses. Therefore, the question is, does anyone know if both
>outputs of both converters can be "ganged together" as a common
>+ input to the 14v fuse holder/bus and collectively provide a 14 amp
>service? This would simplify fusing the radio, tpdr and turn coordinator
>and maybe even provide service for a spare.
>
>I dragged the net but found no info on ganging together the outputs of
>these converters.
What is the make and part number of these converters. Depending
on manufacturer's recommendations, they may not run well in
parallel. Also, consider that any single converter is a single
point of failure for all the devices that depend on its functionality.
You might want to consider a single converter for each device.
Let's see what devices you have in hand at the moment and
go from there.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
|
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dstroud(at)storm.ca
Guest
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| Posted: Mon Dec 10, 2007 12:34 pm Post subject: Joint use of two power converters |
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Thank you, Bob. The converters are Collins PWC-150's,
both are model 622-2093-001's, serials 8590 and 20661
both with mods 1 &2.
The devices to run are a King KY97A radio, a Narco AT150
transponder and an Electric Gyro Corp turn and slip indicator.
David Stroud Ottawa, Canada
C-FDWS Christavia
Fairchild 51 under construction
---
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retasker(at)optonline.net
Guest
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| Posted: Mon Dec 10, 2007 9:06 pm Post subject: Joint use of two power converters |
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An observation: From the pictures that are shown on the site that Matt
provided it looks like these are simple linear regulators, which means
that you will be dissipating the same amount of power that you are using
(28V (at) 5A and 2A in give you 14V (at) 5A and 2A out). So, at full load
power consumption you will be dissipating almost 100W in each of these
two regulators.
Regulators usually have some way of sensing the output voltage they are
regulating (unless it is a simple series voltage dropping setup). When
the regulator senses the output voltage, whether it is coming from it's
own internal circuitry or from the other regulator that is also
connected to the 14V bus, it "throttles back" and lowers the internal
regulator drive, essentially shutting down the output. What that means
is that the regulator with the highest output will supply all the
current your bus requires until it is overloaded. I don't know what
happens to these supplies at overload, but I suspect that they are an
unsophisticated design and probably just overheat if you try to draw
more than their rated current.
In other words, I strongly suspect that you cannot connect the outputs
unless all you want is redundant power for up to 7 amps. In which case,
you could connect both outputs through an isolating diode to your bus.
If one fails the other will take up the load - but only to 7A total.
If you need more than 7A, then you will have to feed individual outputs
to individual instruments.
Unless you already have these devices (and even if you do), you might
want to consider a good switching regulator to minimize the wasted power
and supply the current you need. You can certainly get one for the same
or less cost as these two linear supplies.
My $0.02.
Dick Tasker
david stroud wrote:
| Quote: |
Lads, thanks to Bob's lead to existing diagrams and timely input
from several listers, I've decided to forge ahead with my own
wiring diagram/system.
Due to equipment already on hand, I will be running 28v for most
requirements and power down to 14v via two Collins PWC 150
power converters to run the radio, transponder and turn coordinator.
These converters take in 28 v and output 14v 5amp and 2 amps
each. There's no handy way to mount a fuse between their outputs
and the end user and I do have two very nice auto style fuse holders
on hand that I was intending to use as a 28v and 14v bus bar. The
+ input on these fuse holders is a single item leading to all + sides
of the fuses. Therefore, the question is, does anyone know if both
outputs of both converters can be "ganged together" as a common
+ input to the 14v fuse holder/bus and collectively provide a 14 amp
service? This would simplify fusing the radio, tpdr and turn coordinator
and maybe even provide service for a spare.
I dragged the net but found no info on ganging together the outputs of
these converters.
Thanks.
David Stroud Ottawa, Canada
C-FDWS Christavia
Fairchild 51 under construction
|
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