Server PSU Question

[dani_r]

So on page 6 half way down it shows one psu insulated with the ground removed. You seriously think this is the way to go?

After someone with real experience tells you it is not you ignore sound advice?

Riiiiight then!

Firstly, I haven't ignored ANY advice. I have taken on board all the information that has been given and all info i have available at this present time. I have used my own human brain to make a series of decisions based on:

A) Self Preservation (the desire not to be electrocuted)

B) The best option for my current and future requirements

C) See 'A'

My reference to "the way forward" was simply referring to the use of the Dell Poweredge 6650, as it already has the AC/DC grounds separated. Meaning safer use as there's none of this 'live case' carry on. This idiot who insulated the unit with no ground will clearly run the risk of a nice little shock! He clearly didn't understand the concept.

I am already in talks with a number of people who have used this unit to get their advice and experience.

If I feel that this option is not for me, in terms of safety, or I think it will be too much to do then I shall reconsider.

I'm not ignoring any advice or brushing over any areas of safety. I'm also not 5 years old! So please don't talk down to me, ok? I take safety VERY seriously and will not just jump into something like this without getting all the info. The reason being 'See A'.

Some proper attitudes on this forum.

Ridiculous.

[Andy from Sandy]

If you write, "I think the thread on HF is the way to go" then everyone one would come to the same conclusion as me. If I wanted to talk down to you then believe me my post would have been completely different. Sorry to of offended you.

In actuality I don't really care what you do.

[Dudifiedad]

Dani I've just made exactly what you are after. I have two psu's providing 12volts each and have put a 230v switch on the ac supply to them so I can switch one or other off. The 12v positive and negative leads on each charger terminate with an EC5 and I'm making up this morning an external series lead to connect the two chargers together when I want 24v. This gives me the facility to run both pus's giving 24v with the series lead attached and use only one psu providing 12v once the series lead is detached.

We'll post pictures on the forum tomorrow sometime

[rapidgaz]

Mr Safety Officer if someone comes to the field with one of these I think you should not allow it unless categorically it can be proved it has been constructed as per xygaz's (Steve's) instructions.

You don't have to remove the earths on the dell 6650 psu's.


Sent from my iPhone using Internet.

[dani_r]

If you write, "I think the thread on HF is the way to go" then everyone one would come to the same conclusion as me. If I wanted to talk down to you then believe me my post would have been completely different. Sorry to of offended you.

In actuality I don't really care what you do.

The main thread was about using the Dell 6650s mate. One person halfway through was showing his interpretation using different PSUs. Surely you can see that? Almost every other post is about the Dell units.

[Dudifiedad]

Incidentally I chose the dc ground float option for safety. All you need to do is insulate the pc board from the psu case. The pc board is grounded to the case on my pus's where the screws attach the pc board to the case. So here I replaced the metal screws with plastic and inserted some plastic washers where necessary. I understand from my contact within the forums that if you want to use one of the pus's for 12v only then it should be the unmodified one you use. Also when using both chargers in series with the lead for 24v I'm led to believe that the modified psu should be the one with it's negative lead connected to your charger. The unmodified psu will have its positive lead connected to your charger and the two remaining leads shall be connected together via the part of the series lead.

I can point you to threads in a particular forum where I found the absolute best advice. Coincidentally the psu's that they were using were the exact same ones that I had already bought.

[Dudifiedad]

Danni

I don't know anything about your Dell psu's though and whether you need to float the ground on one of them. All I can say is I had to on my HP pus's.

If you need the thread links I'm offering then let me know

[dani_r]

Thanks for your replies! I'll be doing some more reading before ordering anything! I'll certainly be in touch though

[NiceBlades]

Incidentally I chose the dc ground float option for safety. All you need to do is insulate the pc board from the psu case. The pc board is grounded to the case on my pus's where the screws attach the pc board to the case. So here I replaced the metal screws with plastic and inserted some plastic washers where necessary. I understand from my contact within the forums that if you want to use one of the pus's for 12v only then it should be the unmodified one you use. Also when using both chargers in series with the lead for 24v I'm led to believe that the modified psu should be the one with it's negative lead connected to your charger. The unmodified psu will have its positive lead connected to your charger and the two remaining leads shall be connected together via the part of the series lead.

I can point you to threads in a particular forum where I found the absolute best advice. Coincidentally the psu's that they were using were the exact same ones that I had already bought.

Adam, I think if you are doing the build with HP PSU's you've got your psu's the wrong way round. I'm following the thread on talk heli for 24volt psu supply and have just completed XYGUY's direction in cutting the board on the positive psu, the one with red wires as per "Rob's" picture which is referenced (page 5 of thread "Building a 24 volt power supply). I thought both PSU's had to be on no matter what voltage you required to have positive and negative connections. Apologies if your following a different build, Ian.

[Dudifiedad]

Adam, I think if you are doing the build with HP PSU's you've got your psu's the wrong way round. I'm following the thread on talk heli for 24volt psu supply and have just completed XYGUY's direction in cutting the board on the positive psu, the one with red wires as per "Rob's" picture which is referenced (page 5 of thread "Building a 24 volt power supply). I thought both PSU's had to be on no matter what voltage you required to have positive and negative connections. Apologies if your following a different build, Ian.

I'll look at the thread on talk heli to see what this is all about. The advice given to me was via RCGroups and the chap there said that the negative lead from the modified psu should connect to the charger. If I have it the wrong way round it'll be no problem changing it. As currently installed the two pus's are giving out 24v together although a load test has not yet been done. Regarding having both psu's on for power regardless of voltage. We've built the psu's as independent units so they can be used independently to provide 12 volts if that is only required. The two psu's are encased within a ventilated ABS Housing and each terminate with a EC5 connector. If we want 12v we switch on the psu no.1 (the unmodified psu) only and connect the charger to the EC5 from this unit. If we want 24v we connect the psu's with an external series lead (for the dc output side) that we have made up and connect the charger to this.

I'll look at Rob's picture

[Dudifiedad]

Ian (NiceBlades) you are quite right about my psu's being the wrong way round. I looked back at my project notes and it should be the unmodified power supply negative DC lead that should be connected to the charger along with the positive DC lead from the modified psu leaving the remaining positive and negative lead to be connected together. As I hadn't created my series lead at the time of the original posting it made no extra work to make the change. Series lead now made and all working ok.

Many thanks for pointing this out and I hope Dani_r reads all the threads before starting out.