230v motor wiring problems

[AslElectrical]

Hi guys , new to the forum I have been given a motor by a friend to see if I can get it working for him , its from a compressor , not sure of the make of the compressor but the motor has a stamped panel on the side which shows all the details , they are as follows
230v , ac , 2.2kw , 2850rpm, 50hz , 1 phase, 15.5amp, frame number: ped90ln. J067462 , class f , ip54 , 9658
I'm a competent electrician but haven't a clue on motors , its come to me with all the wires removed from the top block ,it has 2 capacitors bolted to the side , the wire colors are red blue black orange yellow , I can take a picture of the top block if needed

Any help would be very much appreciated , thanks in advance
Lee

 

[snowhead]

Capacitor Start, Capacitor run.

There's a start for you to Google.

 

[Marvo]

With larger single phase motors they sometimes use two caps in parallel to act as a single larger capacitor.

Can't help with the colours, they can vary between manufacturers.

Are there any ID collets on the wiring with markings like U1, U2 etc?

Are you sure there's 5 wires?

If you peer into the back can you see a centrifugal switch assembly?

I've given you full member permissions so you should be able to attach images if they're not too large.

 

[AslElectrical]

Hi marvo thanks for the quick and useful reply ,
There is 100% only 5 cables if I remove the cover surrounding the connector block you can see that they go directly into the windings of the motor , or atleast they appear to , 3 are labled but the other 2 aren't , I have red -U1 black-U2 yellow Z2 but the orange and blue aren't labeled I'm guessing one of the non labbeled should be z1 ? I'm not sure on how to add photos as I'm using my phone as to the laptop, I can email them to you if you like

 

[Marvo]

It's no wonder you were having attachment issues, the image was 5Mb which is way too large for the forum image filesize limits.

Image res reduced and attached.

 

[Marvo]

Does the motor have a centrifugal switch built into the back of it? Can you see a make and model number anywhere?

 

[Marvo]

Here's the other pics you sent me;

 

[Marvo]

I can tell you 2 things that were evident from the photos,

firstly the windings are a peculiar colour, they look like there's been flash damage or overheating so I'd recommend you megger test the motor before going any further. Put a thousand volts onto each of the 5 wires and see if there's an insulation fault to earth.

Secondly the turquoise or light blue wire is an odd one out. It looks like it's a different size wire to the other four wires so I'm guessing it's not one of the winding wires. It's unusual for there to be an odd number of wires, there will be 4 wires going to the windings U1, U2, Z1 and Z2 and they're never commoned together internally because that means there's no option to reverse the run direction.

If there was wiring from a centrifugal start switch it would be two wires, likewise if there was a thermistor or some other form of protective device that would also be a couple of wires, not a single one.

At this stage in the game I'm tempted to say it's time to take it to a motor rewinders or repair shop and get it tested. I think there's a good chance you're going to cause damage to it if you go on with guesswork.

 

[Darkwood]

Got to agree with you Marvo .. Deffo some major overheating and as you say arcing/shorting/flashover damage...

on that note buy a new one or get it rewound then you'll have the correct marking then anyway.

Your mate gave it to you because it doesn't work .. the evidence is visual and not looking good.

 

[AslElectrical]

Thanks for a the reply , it doesn't need to be reversed as its only for a compressor to go one way , any ideas of how its wired ? There's a locol recon place by me I'll run an ir test on it and then go from there