ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#136712 - 05/01/03 01:13 AM Plug- Pack Power Supplies
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
I've got a 12V cordless Drill, that uses one of them plug-pack power supplies.
It stopped charging last week so I took it back to the place of purchase and was graciously informed that replacements for "this particular model" are no longer available, fancy that, it's only 3 years old and the battery and drill are fine!.
So, not wanting to fork out more cash to buy another Drill, I bit the bullet and decided to have a go at repairing the old PSU.
I eventually(after resorting to using a hammer and cold chisel to split the casing)
managed to access the innards of this thing.
All that's in there was a few discrete components, a tranny and a 5A 3AG fuse.
The fuse was blown, so I changed it and we were back in business!.
But, long story short, I wonder how many people have been told the same thing and HAVE bought a new drill, etc, because of a 50 cent fuse?.
Also, wouldn't it be wiser to have the fuse on the OUTSIDE of the case, considering that it takes a mammoth job to get to it?.
And, what a lie, the statement "No user serviceable parts inside".
What do you guys think of this?.
I was really annoyed, when I found out that it was just a fuse!!.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
Top
Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
#136713 - 05/01/03 08:19 AM Re: Plug- Pack Power Supplies
C-H Offline
Member
Registered: 09/17/02
Posts: 1497
Loc: Stockholm, Sweden
You are darn right. If there is a fuse inside, of course it should be possible to replace it!

How about a case that can be opened? Like in the good old days, when they had screws.
Top
#136714 - 05/01/03 10:04 AM Re: Plug- Pack Power Supplies
Texas_Ranger Offline
Member
Registered: 12/17/01
Posts: 2391
Loc: Vienna, Austria
Or make the fuse accessible from outside. I've got an old wall wart that has screw covers over the fuses.
Top
#136715 - 05/02/03 12:04 AM Re: Plug- Pack Power Supplies
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
Well, guys, the question I ask is this,
If we have to have our fuses and other protective equipment in an accessible place, why can't the manufacturers of these PSU's?
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
Top
#136716 - 05/02/03 02:31 AM Re: Plug- Pack Power Supplies
pauluk Offline
Member
Registered: 08/11/01
Posts: 7520
Loc: Norfolk, England
I'm not a fan of the "plug-pack" power supplies at all. I've seen a few where there is a primary fuse, but it's firmly soldered in place: Easy to replace for the likes of us, but probably not for the average user.

Some don't have a normal fuse, but incorporate a thermal overload device on the primary side. Another concern there's been in the U.K. is that some of the real cheap and nasty units don't have any protection on the primary side whatsoever. Plugged into the typical British ring, that leaves the unit protected only by a 30 or 32A fuse or MCB.
Top
#136717 - 05/02/03 11:54 AM Re: Plug- Pack Power Supplies
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
Paul,
That's a real worry, knowing that all you have to protect one of these little units is a 30A fuse or MCB!.
My charger also had a fast blow fuse in it, which I thought was strange for a device with a tranny in it?.
Suppose it just means that our rubbish tips will fill up that much faster with crook power supplies.

[This message has been edited by Trumpy (edited 05-02-2003).]
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
Top
#136718 - 05/02/03 12:54 PM Re: Plug- Pack Power Supplies
SvenNYC Offline
Member
Registered: 08/19/02
Posts: 1691
Loc: New York City
Fuse? In a wall wart????

What's that?
Top
#136719 - 05/02/03 02:59 PM Re: Plug- Pack Power Supplies
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
Sounds like a sort of wild animal, to me!.
Like a wart-hog or something.

[This message has been edited by Trumpy (edited 05-02-2003).]
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
Top
#136720 - 05/03/03 06:23 AM Re: Plug- Pack Power Supplies
Texas_Ranger Offline
Member
Registered: 12/17/01
Posts: 2391
Loc: Vienna, Austria
It was a huge animal, I think a power supply for a stone-age ITT answering machine/phone combo (1970ies I guess). 16V output and 2 2A fuses, either primary fuses for line/neutral or secondary fuses for +/-. Really huge and heavy. If you know the old Apple PowerBook 100 series wall warts, the same size but much heavier.
The one for the old Panasonic EasaPhone answering machines sold in Austria/Germany was similar. I once saw the US version of the same machine, much smaller power pack.
Top

Member Spotlight
Member Since: 02/23/13
Posts: 204
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 53 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 49
HotLine1 43
gfretwell 18
Ruben Rocha 12
Trumpy 9
 
Newest Members
Freecrowder, clee512, Jdscott2005, FAIZAN, Regitest2

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals