Single Phase 230V supply and 3ph Compressor install.

[itstony]

Hi guys,
Have an option of an old, but really solid superb condition and well made large +/- 200ltr compressor from Denmark. Rarely used since purchased/Build 1987.
Only supply I have is 230V Sing/Ph. Never had any dealings with 3 Ph.

First name plate.
Grundfos 3~MOT MG90LAR-24F115 No: 870000??
220 Δ/380 Y V 50hz 2855 /min
9.0 / 6.2 A IP 54 CL. F 2.2Kw
Cos 0.9 P1 - 3.0 Kw

Over a day searching and it appears there is no history on this now. Called people that were of no help on the plate details surprisingly. Suspect 220 delta 9.0A and P1-3.0 Kw relate to start up? Seeking confirmation and would be appreciated.

4mm2 supply +/-50M (pity not 6mm2) from main Cons box 32A MCB to 2nd Con Box with choice MCB and RCD. No other load.
At present to install this 3Ph with the 1Ph 230v I can only see a VFD as the option. If there are other options would be pleased to know. There are always unknown factors and losses with projects like this and hoping to hear those views of concern.
Compressor would be 3-4m from the Cons box and controller, if a safe and sensible solution ticks the boxes if and when it will be used, which will be little, not daily.
Thanks in advance.

 

[telectrix]

might be cheaper to change motor to single phase unit.

 

[itstony]

might be cheaper to change motor to single phase unit.

Thank you, that's an option.

 

[telectrix]

think i paid around £100 for a 3 HP motor in a similar compressor.the original motor burnt out. the idiot who borrowed it ran it off a long extension lead and failed to see the motor had stalled due to volt drop. hence a dead motor.

 

[itstony]

think i paid around £100 for a 3 HP motor in a similar compressor.the original motor burnt out. the idiot who borrowed it ran it off a long extension lead and failed to see the motor had stalled due to volt drop. hence a dead motor.

This is a known issue to me, hence why I carefully explained without wanting to pretend I'm expert about cabling. This motor I saw a replacement online 3~ available £1,246 .... that is some dough.
Can see the build quality is very good, as most engineering was.
Best stick with it and find another way round it.?

 

[Strima]

You get a motor a lot cheaper than that. Madly enough I’ve found a few at car boot sales over the years but keep an eye on the usual suspects such as eBay and Facebook marketplace.

 

[itstony]

You get a motor a lot cheaper than that. Madly enough I’ve found a few at car boot sales over the years but keep an eye on the usual suspects such as eBay and Facebook marketplace.

Lucky I am not needing a new one, the one on it is fine, just wrong phase.

 

[StephenRowley]

VFD or a rotatory converter would be other options.

 

[itstony]

VFD or a rotatory converter would be other options.

Thanks, could you expand on that jus a little please?

 

[davesparks]

220/380 is not standard UK three phase so you won't be able to use an off the shelf phase converter.

I suspect you will need to go for a VFD to run this motor.

 

[itstony]

220/380 is not standard UK three phase so you won't be able to use an off the shelf phase converter.

I suspect you will need to go for a VFD to run this motor.

Thanks for the reply.
The compressor is in Spain and setup on 3~ which the owner had upgraded his place in the past. It originated in Denmark, although he was German. Since passed away.

Based on limited knowledge of VFD, it seems the correct rating is quite important to match, which may be different from the 2.2Kw on the motor. Perhaps contacting one of the suppliers will help?

 

[Houtos]

There is a way of running a 3 phase motor with single phase using a capacitor.

 

[davesparks]

There is a way of running a 3 phase motor with single phase using a capacitor.

But that only works if you have the correct vokatge to begin with.

 

[ElectroChem]

Thanks for the reply.
The compressor is in Spain and setup on 3~ which the owner had upgraded his place in the past. It originated in Denmark, although he was German. Since passed away.

Based on limited knowledge of VFD, it seems the correct rating is quite important to match, which may be different from the 2.2Kw on the motor. Perhaps contacting one of the suppliers will help?

The 220V 9A Delta from the nameplate is consistent with a 2.2kW motor. When running with a VFD it has to be at least equal in rating, and not too hugely over as VFDs are not designed to reliably protect motors much smaller than their rating from overcurrent.
If I had this compressor in front of me, I'd be perfectly happy to hook a 2.2kW drive up to the motor and press the go button.

 

[itstony]

The 220V 9A Delta from the nameplate is consistent with a 2.2kW motor. When running with a VFD it has to be at least equal in rating, and not too hugely over as VFDs are not designed to reliably protect motors much smaller than their rating from overcurrent.
If I had this compressor in front of me, I'd be perfectly happy to hook a 2.2kW drive up to the motor and press the go button.

Thanks for the reply.
I'd be happy to find a 2nd hand Rotary converter or VFD, but all about timing that appears.
It does look like a VFD is 6/4 Fav though. They are expensive, and must decide. I have looked at a few, avoiding e-bay and Amazon, just blatantly gear from China. Was tempted all but 30seconds. Invertek make them, I have an one on pool system, good gear but pricey.
Is there a make you might be able to suggest or know of that is decent. This compressor wont be used much.
Thanks again?