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3 blown Power supply's in 6 months.



 
 
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  #31  
Old May 9th 05, 06:17 PM
w_tom
external usenet poster
 
Posts: n/a
Default

And again, fuse designed to blow so that "damage to the
lines/devices" created by component failure does not threaten
human life. Any device whose destruction can harm humans will
be disconnected by fuses and other equivalent 'one shot'
devices. The fuse is not installed to protect hardware. In
the process of protecting humans, a fuse may protect some
hardware - ie a power cord. But fuses are installed to
protect humans. Any protected hardware is incidental.

When a fuse blows in a power supply, a failed component
often causes that open fuse. Even shorting all power supply
outputs would not blow a fuse. The concept is called
fold-back current limiting. The fuse is for human
protection. It blows typically because a component inside the
supply has failed. Furthermore many power supplies don't use
fuses. Such human protection is found elsewhere in the power
supply design making the fuse unnecessary.

Leythos wrote:
In article , says...
Again, fuses blow after the electronic damage has happened
so that the human is not put at risk. This being basic
electrical knowledge that even a computer assembler should
know.


Sorry, the fuse it sized to prevent damage to the lines/devices, not to
blow after the device has been damaged (although that may also happen).

The fuse is sized to protect some part of the device, be it power lines,
transformers, etc....

Ads
  #34  
Old May 9th 05, 06:32 PM
tfw48079
external usenet poster
 
Posts: n/a
Default

One more option to check. Make sure the PSU is set for the correct incoming
voltage. There is a red switch to set for 110/120 or 220/240.

"RobW" wrote:

Hi all,
I have a P.C. that keeps blowing power supply's.
It is P4 2.4, Gigabyte GA-8IG100MK Main Board in a "whitebox" of
unknown make.
Low spec AGP video card
2 x Optical drives
1 x 80gig Seagate Barracuda
The last power supply it blew was a Unicase 400W Silent power supply.


I has been plugged into a middle of the road surge protector the whole
time (which seems to fine.)
This has all happened in the same house; however there hasn't been any
other power problems.

I'm thinking maybe it's the case because the problems happend when the
unit is being switched o every time.
Anyone else seen something like this?
TIA

Rob


  #35  
Old May 9th 05, 06:32 PM
tfw48079
external usenet poster
 
Posts: n/a
Default

One more option to check. Make sure the PSU is set for the correct incoming
voltage. There is a red switch to set for 110/120 or 220/240.

"RobW" wrote:

Hi all,
I have a P.C. that keeps blowing power supply's.
It is P4 2.4, Gigabyte GA-8IG100MK Main Board in a "whitebox" of
unknown make.
Low spec AGP video card
2 x Optical drives
1 x 80gig Seagate Barracuda
The last power supply it blew was a Unicase 400W Silent power supply.


I has been plugged into a middle of the road surge protector the whole
time (which seems to fine.)
This has all happened in the same house; however there hasn't been any
other power problems.

I'm thinking maybe it's the case because the problems happend when the
unit is being switched o every time.
Anyone else seen something like this?
TIA

Rob


  #36  
Old May 9th 05, 06:54 PM
Jim Macklin
external usenet poster
 
Posts: n/a
Default

Fuses are rated by amps and time and are intended to open
the circuit before the wires emits smoke. In other words,
the fuse must blow before a fire starts. There are fast
fuses that protect some electronic circuits in devices such
as the resistance (ohms) circuit in a voltmeter.

There are also slow-blow fuses for use with motors.

There are ground fault detectors and there are Hall Effect
sensors which can detect problems in circuits.

One thing that the OP needs to tell, under what condition
and how fast does the PSU blow, does it work at all and
sometimes fail, or does it always fail immediately?


--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.


"Leythos" wrote in message
...
| In article ,
says...
| Again, fuses blow after the electronic damage has
happened
| so that the human is not put at risk. This being basic
| electrical knowledge that even a computer assembler
should
| know.
|
| Sorry, the fuse it sized to prevent damage to the
lines/devices, not to
| blow after the device has been damaged (although that may
also happen).
|
| The fuse is sized to protect some part of the device, be
it power lines,
| transformers, etc....
|
|
| --
| --
|

| remove 999 in order to email me


  #37  
Old May 9th 05, 06:54 PM
Jim Macklin
external usenet poster
 
Posts: n/a
Default

Fuses are rated by amps and time and are intended to open
the circuit before the wires emits smoke. In other words,
the fuse must blow before a fire starts. There are fast
fuses that protect some electronic circuits in devices such
as the resistance (ohms) circuit in a voltmeter.

There are also slow-blow fuses for use with motors.

There are ground fault detectors and there are Hall Effect
sensors which can detect problems in circuits.

One thing that the OP needs to tell, under what condition
and how fast does the PSU blow, does it work at all and
sometimes fail, or does it always fail immediately?


--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.


"Leythos" wrote in message
...
| In article ,
says...
| Again, fuses blow after the electronic damage has
happened
| so that the human is not put at risk. This being basic
| electrical knowledge that even a computer assembler
should
| know.
|
| Sorry, the fuse it sized to prevent damage to the
lines/devices, not to
| blow after the device has been damaged (although that may
also happen).
|
| The fuse is sized to protect some part of the device, be
it power lines,
| transformers, etc....
|
|
| --
| --
|

| remove 999 in order to email me


  #40  
Old May 9th 05, 07:12 PM
Falcon
external usenet poster
 
Posts: n/a
Default

As an industrial electrical designer (large industrial ovens and furnaces) I
always design and fuse for the protection of the device.


"w_tom" wrote:

And again, fuse designed to blow so that "damage to the
lines/devices" created by component failure does not threaten
human life. Any device whose destruction can harm humans will
be disconnected by fuses and other equivalent 'one shot'
devices. The fuse is not installed to protect hardware. In
the process of protecting humans, a fuse may protect some
hardware - ie a power cord. But fuses are installed to
protect humans. Any protected hardware is incidental.

When a fuse blows in a power supply, a failed component
often causes that open fuse. Even shorting all power supply
outputs would not blow a fuse. The concept is called
fold-back current limiting. The fuse is for human
protection. It blows typically because a component inside the
supply has failed. Furthermore many power supplies don't use
fuses. Such human protection is found elsewhere in the power
supply design making the fuse unnecessary.

Leythos wrote:
In article , says...
Again, fuses blow after the electronic damage has happened
so that the human is not put at risk. This being basic
electrical knowledge that even a computer assembler should
know.


Sorry, the fuse it sized to prevent damage to the lines/devices, not to
blow after the device has been damaged (although that may also happen).

The fuse is sized to protect some part of the device, be it power lines,
transformers, etc....


  #41  
Old May 9th 05, 07:12 PM
Falcon
external usenet poster
 
Posts: n/a
Default

As an industrial electrical designer (large industrial ovens and furnaces) I
always design and fuse for the protection of the device.


"w_tom" wrote:

And again, fuse designed to blow so that "damage to the
lines/devices" created by component failure does not threaten
human life. Any device whose destruction can harm humans will
be disconnected by fuses and other equivalent 'one shot'
devices. The fuse is not installed to protect hardware. In
the process of protecting humans, a fuse may protect some
hardware - ie a power cord. But fuses are installed to
protect humans. Any protected hardware is incidental.

When a fuse blows in a power supply, a failed component
often causes that open fuse. Even shorting all power supply
outputs would not blow a fuse. The concept is called
fold-back current limiting. The fuse is for human
protection. It blows typically because a component inside the
supply has failed. Furthermore many power supplies don't use
fuses. Such human protection is found elsewhere in the power
supply design making the fuse unnecessary.

Leythos wrote:
In article , says...
Again, fuses blow after the electronic damage has happened
so that the human is not put at risk. This being basic
electrical knowledge that even a computer assembler should
know.


Sorry, the fuse it sized to prevent damage to the lines/devices, not to
blow after the device has been damaged (although that may also happen).

The fuse is sized to protect some part of the device, be it power lines,
transformers, etc....


  #42  
Old May 9th 05, 07:21 PM
Mike Hall \(MS-MVP\)
external usenet poster
 
Posts: n/a
Default

Tom

A fuse does NOT exist purely to save human life.. the fuses inside a hi-fi
power amplifier or CB or computer power supply are there to protect
circuits.. some will be fast blow, some will be slow blow, and some are
thermal types..

Note also that automotive fuses do NOT exist to save human life.. and if you
had followed any links on the URL given to you, that would have become
patently clear to you too..


--
Mike Hall
MVP - Windows Shell/User
http://dts-l.org/goodpost.htm





"w_tom" wrote in message
...
Why did you provide a URL for circuit protection devices?
Those are not fuses? Did you assume that because it is a
Littelfuse product, then it must be a fuse? Or did you first
review the datasheets before posting? Cited are applications
for circuit protection devices .... which are not fuses.

Circuit protector devices and fuses are not the same
device. You have claims a device called TMOV is a fuse. That
is wrong. Go back and learn about TMOVs ... "available in 14
and 20 mm disc size with and without a monitor lead (to alert
you that the thermal element has opened). The 14 mm parts are
rated to 6kA and the 20 mm parts are rated to 10kA." Do you
claim these "6,000 and 10,000 amp fuses" would stop electronic
damage?

Again, fuses blow after the electronic damage has happened
so that the human is not put at risk. This being basic
electrical knowledge that even a computer assembler should
know.

"Mike Hall (MS-MVP)" wrote:
Take a look at this..
http://www.littelfuse.com/cgi-bin/r....ION=oNm8TFzMb5

Fuses are not just found in domestic, industrial and automotive
power supply lines..



  #43  
Old May 9th 05, 07:21 PM
Mike Hall \(MS-MVP\)
external usenet poster
 
Posts: n/a
Default

Tom

A fuse does NOT exist purely to save human life.. the fuses inside a hi-fi
power amplifier or CB or computer power supply are there to protect
circuits.. some will be fast blow, some will be slow blow, and some are
thermal types..

Note also that automotive fuses do NOT exist to save human life.. and if you
had followed any links on the URL given to you, that would have become
patently clear to you too..


--
Mike Hall
MVP - Windows Shell/User
http://dts-l.org/goodpost.htm





"w_tom" wrote in message
...
Why did you provide a URL for circuit protection devices?
Those are not fuses? Did you assume that because it is a
Littelfuse product, then it must be a fuse? Or did you first
review the datasheets before posting? Cited are applications
for circuit protection devices .... which are not fuses.

Circuit protector devices and fuses are not the same
device. You have claims a device called TMOV is a fuse. That
is wrong. Go back and learn about TMOVs ... "available in 14
and 20 mm disc size with and without a monitor lead (to alert
you that the thermal element has opened). The 14 mm parts are
rated to 6kA and the 20 mm parts are rated to 10kA." Do you
claim these "6,000 and 10,000 amp fuses" would stop electronic
damage?

Again, fuses blow after the electronic damage has happened
so that the human is not put at risk. This being basic
electrical knowledge that even a computer assembler should
know.

"Mike Hall (MS-MVP)" wrote:
Take a look at this..
http://www.littelfuse.com/cgi-bin/r....ION=oNm8TFzMb5

Fuses are not just found in domestic, industrial and automotive
power supply lines..



 




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