UPS decommissioning - Best Power S4000 - Electricians Forum | Electrical Forum | An electrical forum for electricians in the UK

G1ZmO · 06-03-2008

Hi,

I have been asked by my boss to look into whats involved with decommissioning a large UPS system for a customer.

I have an HND Electronics but no high voltage experience.

Can anyone guide me as to what to do? Even if it's to say "No, get someone who's qualified"

The UPS to be deinstalled is a Best Power S4000 80KVA UPS with 2 full battery cabinets

Thanks

Paul

Shakey · 06-03-2008

Gizmo, what makes you think its high voltage?

the 80KvA is only its power rating (its capacity if you like)

assuming its feeding a 230V or 400V circuit, I would isolate the battery packs, isolate from its connection to the existing electrcial AC system so its is electrically isolated and dead, then rip the mother out!

G1ZmO · 06-03-2008

It probably is as easy as that but I've no experience so just wanted some confirmation that I'm not going to have to mess around with any 400 volt live supply.

Sorry, when I said HV I meant 400 volt. I do realise that's not HV

How is it likely to be connected into the mains? I assume it'll be wired into a breaker or something?

Thanks

Paul

rumrunner · 06-03-2008

Hi Giz
it is likely to be connected to the mains via a local isolator ,the cable feedind the unit will nead to be disconected there, isolate the local isolator and disconect it.
the batterys are likely to be in three banks ,i would remove the negative first which is likely to be common to all of them ,(i think this is the correct precedure) ,then the positives ,then any links between the batterys ,then take it out ,have fun!
atvbitwww

Shakey · 07-03-2008

The batteries are more likely to be in series-parralel banks. Series for voltage and parralel for capacity. So there will be a 'master' negative and a 'master' positive. Discoonect these first, doesnt matter which, thats only on cars where the chassis is negative and disconnecting the positive first will short the battery.

Get rid of the interconnecting links one by one.

The output of the UPS will most likely be connected into an automatic switching panel - just conectors with their sensing coils connected accross opposing circuits.

just find the panel it goes into it and isolate from there

G1ZmO · 07-03-2008

OK seems pretty straightforward.

We've been asked to disconnect and move the unit outside (dont know how far yet) so that a forklift can put it on a lorry.

Has anyone seen one of these UPS units?
Is it likely that 2 people could move it?

Shakey · 07-03-2008

Quote:

Originally Posted by G1ZmO

OK seems pretty straightforward.

We've been asked to disconnect and move the unit outside (dont know how far yet) so that a forklift can put it on a lorry.

Has anyone seen one of these UPS units?
Is it likely that 2 people could move it?

An 80KVa unit? thats two guys with BIG kahunas to shift that. Think of a wardrobe filled with metal, and your on the right track!

Seriously, to move that outside your probably gonna want it on rollers

Bane · 07-03-2008

Quote:

Originally Posted by Shakey

An 80KVa unit? thats two guys with BIG kahunas to shift that. Think of a wardrobe filled with metal, and your on the right track!

Seriously, to move that outside your probably gonna want it on rollers or else speak to Bane

Yep, I could lift that...

Shakey · 08-03-2008

Quote:

Originally Posted by Bane

Yep, I could lift that...

Yes Bane, of course you could, you big strong lad

G1ZmO · 10-03-2008

Could anyone give me a link to pictures / instructions on what the input and output isolators may be like and what tools I should expect to need on this? (and anything else I should look out for bearing in mind I have never worked on 3-phase before)

Thanks
Paul