24v AC Power Supply

peter_dublin · 29-04-2013 11:49PM #1

Hi.

Just a quick query, I have a device which has a 24v psu which exploded tonight, I was going to order a new generic psu and wire it in but on the output side it has two live and two earth (com).

It was a 24v ac 1amp psu, it okay to get a psu with a single live and com and split it such as the following:

http://www.ebay.ie/itm/AC-DC-POWER-ADAPTOR-SUPPLY-PSU-CHARGER-1500MA-1-5A-9V-12V-13-5V-15V-18V-20V-24V-/170834876778?pt=UK_ConsumerElectronics_PowerAdaptors_SM&hash=item27c68d596a

Thanks

ZENER · 30-04-2013 07:07PM

It was a 24v ac 1amp psu

The one you've linked to is a 24V DC PSU. What was the original PSU powering ?

Ken

peter_dublin · 30-04-2013 08:14PM

ZENER wrote: »

The one you've linked to is a 24V DC PSU. What was the original PSU powering ?

Ken

Hi.

It was powering a console server. The correct psu is:

http://radionics.rs-online.com/web/p/cctv-power-supply-accessories/4948776/

I've attached a picture of the original PSU.

Thanks.

ZENER · 30-04-2013 08:51PM

Not a great photo but I'm almost positive it's a DC PSU otherwise it would have a normal mains trafo rather than an elaborate Switched Mode. I'm pretty sure that's a rectifier at the top left of the PCB bolted to the heatsink along with smoothing caps and coils. I don't think that RS one will do the job. Are you sure it's only 1Amp output from the original ? Looks capable of far more IMO ?

Given the complexity of the original I'd be going with something akin to this one. Unless you csn confirm the spec of the original ?

Ken

peter_dublin · 30-04-2013 08:54PM

ZENER wrote: »

Not a great photo but I'm almost positive it's a DC PSU otherwise it would have a normal mains trafo rather than an elaborate Switched Mode. I'm pretty sure that's a rectifier at the top left of the PCB bolted to the heatsink along with smoothing caps and coils. I don't think that RS one will do the job. Are you sure it's only 1Amp output from the original ? Looks capable of far more IMO ?

Given the complexity of the original I'd be going with something akin to this one. Unless you csn confirm the spec of the original ?

Ken

Hi.

Thanks for the reply, yes there is a sticker on it which you cannot see which says Output: 24vac 1amp, Original PSU model is a PWR-24100-PS-S1 gpso240010.

Thanks

ZENER · 30-04-2013 09:01PM

peter_dublin wrote: »

Hi.

Thanks for the reply, yes there is a sticker on it which you cannot see which says Output: 24vac 1amp, sorry I may be wrong it is either 24vac or 48vac. I will doublecheck.

Thanks

Again, not a great photo but I'm sure I can see a "+" and "-" symbol beside the output connector. If that is the case then it's almost definitely a DC unit.

Ken

Chet T16 · 30-04-2013 10:02PM

I would agree with zener, it looks like a switchmode dc supply. I doubt they would be but check if the two outputs are isolated from each other by checking for continuity on both grounds and lives.

peter_dublin · 30-04-2013 10:54PM

Chet T16 wrote: »

I would agree with zener, it looks like a switchmode dc supply. I doubt they would be but check if the two outputs are isolated from each other by checking for continuity on both grounds and lives.

Sorry lads but you are 100% correct, on rechecking the label it is 24vdc output, checking these things at 3am is never a good idea. Thanks again, very impressive that you can recongnise that by just a photo. On checking the rear the two live and two comm both terminate into the same trace.

Would I be okay in splitting the feed across the two live and two comm feeds. There is continuity between the two lives and comms

Thanks
Peter.

ZENER · 01-05-2013 09:06PM

The PSU I linked to above has screw terminals so it's simply a matter of capturing the wires under these terminals so connecting 2 shouldn't be an issue.

The PSU from EBay wouldn't fill me with confidence to be honest. Look at what's come out of your device and compare it with the cheap plug you linked to, a huge difference in quality and little or no ventilation for heat to escape. Personally I wouldn't be at all happy using it for anything.

Can you give any more info on what the device is that you need to power ? Might help in recommendations ?

This might be a direct replacement.

Ken

peter_dublin · 02-05-2013 09:40AM

ZENER wrote: »

The PSU I linked to above has screw terminals so it's simply a matter of capturing the wires under these terminals so connecting 2 shouldn't be an issue.

The PSU from EBay wouldn't fill me with confidence to be honest. Look at what's come out of your device and compare it with the cheap plug you linked to, a huge difference in quality and little or no ventilation for heat to escape. Personally I wouldn't be at all happy using it for anything.

Can you give any more info on what the device is that you need to power ? Might help in recommendations ?

This might be a direct replacement.

Ken

Hi Ken.

Yes that is a direct replacements, minimum order is 100 pounds so that option is out :-(

Chet T16 · 02-05-2013 06:48PM

Something like this will work: http://www.circuitspecialists.eu/power-supplies/switching-power-supplies-encl/24-volt-enclosed-switch-mode-power-supply-24v-1-8a-40w-psu

Its from a reputable seller so the quality should be good. Some of the cheaper ones are terrible. I bought a cheap universal laptop charger and the output was shockingly noisy. Have a look at the top scope trace, that should be smooth!

peter_dublin · 05-05-2013 01:16PM

Chet T16 wrote: »

Something like this will work: http://www.circuitspecialists.eu/power-supplies/switching-power-supplies-encl/24-volt-enclosed-switch-mode-power-supply-24v-1-8a-40w-psu

Its from a reputable seller so the quality should be good. Some of the cheaper ones are terrible. I bought a cheap universal laptop charger and the output was shockingly noisy. Have a look at the top scope trace, that should be smooth!

Thanks I ordered on of those so hopefully should be here in the next few days.

24v AC Power Supply

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