3 phase electric HELP

[skilly1]

Any chance Of a picture? I am intrigued by a coffee roaster that needs 3 phase!

[rolando]

CunningPlan said:

LOL! Tell you what - we'll attach a croc clip to each of your testicles and then try 230V and 415V and you tell us which hurts more.

skilly1 said:

Any chance Of a picture?

[cqueen]

skilly1 said:

Any chance Of a picture? I am intrigued by a coffee roaster that needs 3 phase!

http://www.youtube.com/watch?v=2EjLNSxk_7U

[Smiler.]

Are you sure that these are 3-phase? What model have you bought?

[cqueen]

Smiler. said:

Are you sure that these are 3-phase? What model have you bought?

Yes I'm sure. You can choose to have them built for single or 3 phase.

Not sure what the issue is though, There's only one plug for the machine and i'll stick it into a 2hp static converter. job done surely?

[Smiler.]

cqueen said:

Smiler. said:

Are you sure that these are 3-phase? What model have you bought?

Yes I'm sure. You can choose to have them built for single or 3 phase.

Not sure what the issue is though, There's only one plug for the machine and i'll stick it into a 2hp static converter. job done surely?

Er, good luck with that then.

Did you choose to have a 3-phase build?

[cqueen]

Smiler. said:

Er, good luck with that then.

Well I havnt heard any reason why it wouldnt work? This is a used machine, I would have chosen single phase otherwise.

[mph1977]

the easy way to answer the question ifs for the OP to take a picure and show us

1. the rating plate

2. the plug on the end of it;s leads or the wires in the lead ...

[Smiler.]

cqueen said:

Well I havnt heard any reason why it wouldnt work? This is a used machine, I would have chosen single phase otherwise.

Motor ratings are usually quoted for input, which can be anything from 1.0 to 0.6 of output. Also, the method of motor control is usually DOL for small motors, which can be 5 to 10 times runnng current.

OTOH, it may all go swimmingly.

[cqueen]

mph1977 said:

the easy way to answer the question ifs for the OP to take a picure and show us

1. the rating plate

2. the plug on the end of it;s leads or the wires in the lead ...

Your wish is my command, also included the one of the motor plates..


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[tr7v8]

That is a 3phase commando plug. But intrigued by the plate which indicates Delta wiring or Star (Wye) as it could be possible to rewire it to run off a single phase albeit 16Amp circuit. Would be worth getting a sparks to open it up & see the options before you buy converters etc.

[cqueen]

Interesting, but do you think it would be worth the cost of a sparks time and any re-wiring costs? remembering that a converter will cost about £350?

[tr7v8]

cqueen said:

Interesting, but do you think it would be worth the cost of a sparks time and any re-wiring costs? remembering that a converter will cost about £350?

I'd at least get a sparks to look at it. Quite a lot of small three phase stuff can be wired single phase. Also if it it is drawing 16AMps then it won't run on a domestic 13A circuit without some creative wiring any way!

[jason s4]

I recently installed something very similar and was able to wire it to a 16A single phase supply.

BUT, you really should get an electrician in to check.

Let us know how it goes.

[cqueen]

jason s4 said:

I recently installed something very similar and was able to wire it to a 16A single phase supply.

Can you give me a little more info on what you had to do?
Thanks

[Steffan]

Without wishing to be a wet blanket (in addition to my other inadequacies) the connection of a 3 phase supply is not something the enthusiastic amateur should attempt.

A wiring fault or failure of the supply, converter or machine could literally be a killer.

3 phase is largely intended for commercial use. I seriously doubt the wisdom of attempting any of this yourself. I strongly advise consulting with appropriately qualified and experience electricians who can advise you on a safe solution. This is NOT a DIY safe activity.

Mains electricity is bad news when it leaks: Three Phase supply is a damned sight more deadly: if it leaks through you or another person you are very likely to be dead. Seriously I would not do this yourself.

[jason s4]

cqueen said:

Can you give me a little more info on what you had to do?
Thanks

Some commercial kitchen appliances can be wired to single or three phase to make connection easier.

It isnt really a case of giving you info on what to do as each appliance can be very different.

As Steffan has said, three phase is NOT something even a competent DIYer should touch as it isnt as straight forward as it may appear.

I am not intending on being evasive with any info, its just that i do not want to be responsible if things go wrong.

PLEASE get in contact with a local electrician.

It could save you a lot of hassle and expense in the long run.

[cqueen]

I have no intention of touching this myself, i just wondered how much work would be involved for the sparky.

[thinfourth2]

Answer the question about are the motors individually switched as it is important.!

My lathe has 2 phase converters to run it. A big one for the main motor and a tiny one for the cooling pump which is controlled separately.

A digital phase converter replaces your control circuit as it gets round the heavy current needed to start a motor up by slowly increasing the frequency. This means that you can't run the control circuit off the phase converter. Also you can't start and stop individual motors off the one converter unless you buy a bigger one.

What I would do is gut the machine and fit a phase converter per motor. As the motor data plate shows you can run the motors in STAR or DELTA modes and I think you need to wire the motors in STAR mode for a digital converter.


P.s. I did all the 3phase wiring myself just to annoy the daily wail readers.

[cqueen]

thinfourth2 said:

P.s. I did all the 3phase wiring myself just to annoy the daily wail readers.

love it

Think I'll just buy a 3.5hp converter and see what happens.