How to wire motor plug

Spoon · Aug 17, 2019

Megawatt said:
My experience with 50hz really has no effect with the exception of clocks and timers

I was thinking more the affect on the motor.
It may not be an issue, just run faster or slower..

Megawatt · Aug 17, 2019

Spoon said:
I was thinking more the affect on the motor.
It may not be an issue, just run faster or slower..

Spoon I’ve never checked the motors with a RPM gage

Megawatt · Aug 17, 2019

jinsingh said:
Hi everyone

I purchased a bench polisher which looks to have come from China. It says its 220v single phase and should work fine in the UK. The power cable has 4 wires in it so I'm confused how to wire a standard UK plug. I have attached a photo of the cable.

Any advice would be much appreciated.

Jinsingh do you have a brand name and model number

jinsingh · Aug 17, 2019

Megawatt said:
Jinsingh do you have a brand name and model number

Hi Megawatt

I only have the image and details from the advert. It was purchased via Aliexpress which is a Chinese wholesale website.

westward10 · Aug 17, 2019

If possible can you remove the motor terminal cover and show the connections within.

Spoon · Aug 17, 2019

jinsingh said:
Hi Megawatt

I only have the image and details from the advert. It was purchased via Aliexpress which is a Chinese wholesale website.

Where did you get the pic of the 4 wires? (Your original pic). That doesn't look like it's from an advert.

GeorgeCooke · Aug 17, 2019

It looks like a US dual phase lead, (what they call 3 wire) though the yellow wire should be white and should not be connected anyway.

Megawatt · Aug 17, 2019

jinsingh said:
Hi Megawatt

I only have the image and details from the advert. It was purchased via Aliexpress which is a Chinese wholesale website.

Thanks jingsing I’ll see what I can come with and advise you

jinsingh · Aug 17, 2019

westward10 said:
If possible can you remove the motor terminal cover and show the connections within.

Hi will try and open motor and take some photos

jinsingh · Aug 17, 2019

Spoon said:
Where did you get the pic of the 4 wires? (Your original pic). That doesn't look like it's from an advert.

Sorry I searched that from the Internet

Lucien Nunes · Aug 17, 2019

This may be a stupid question, but if we assume the cable could be wired to an American 4 Pin plug, could it be wired the same way on a UK plug but ignoring the green (ground)??

No, we don't use that type of power in the UK, it's specifically N. American. I think the references to US power configs here are misleading, there's no reason to think your machine is wired that way. The Chinese 3-phase colours are red/yellow/green which matches your cable (although I think neutral is more often blue now). I suspect one of two things:

a) they sent you a 3-phase machine instead of the single-phase one you ordered.

b) they converted it to single-phase but left the 3-phase mains cable attached.

Either way, they shouldn't sell equipment in the UK with that cable.

We need to see:
1) Motor rating plate
2) Inside motor terminal box
3) Where the cable terminates inside.

jinsingh · Aug 17, 2019

Hi everyone

I am really grateful for all your time and help. Please find attached photos of the motor, wiring, and back of the machine.

Hope it make sense to you guys.

westward10 · Aug 17, 2019

I assume the flex terminates elsewhere.

Megawatt · Aug 17, 2019

westward10 said:
I assume the flex terminates elsewhere.

It’s not 3 phase or the third pole has no jumper and the yellow makes since it has a capacitor in it

westward10 · Aug 17, 2019

Agreed the capacitors weren't clear from the first pic. Cap start and run.

jinsingh · Aug 17, 2019

Megawatt said:
It’s not 3 phase or the third pole has no jumper and the yellow makes since it has a capacitor in it

Hi

So is the motor single phase? Does that help with how the plug should be wired?

Megawatt · Aug 17, 2019

jinsingh said:
Hi

So is the motor single phase? Does that help with how the plug should be wired?

jinsingh said:
So is the motor single phase? Does that help with how the plug should be

this site is not going to let me help you go to you tube and look up 220 single phase motors

Megawatt · Aug 17, 2019

jinsingh said:
Hi

So is the motor single phase? Does that help with how the plug should be wired?

Does the wires have numbers on them

Megawatt · Aug 17, 2019

Megawatt said:
Does the wires have numbers on them

Are there numbers on the wires

Lucien Nunes · Aug 18, 2019

OK, the motor is definitely single phase, but they have left the original 3-phase cable with chinese colours attached. You will need to inspect where the cable terminates, and possibly make some continuity measurements with a multimeter, to find out which colours they have used for line, neutral and earth as it's now impossible to assume anything. In fact it would make more sense to replace the cable to the input terminals as the existing one is totally unrecognised in the UK.

In truth, now would be a good time to call an expert to look at it. Or even call the supplier, although I am not sure whether you will get an intelligible answer that way! However, if you're up for more investigation, do you have a multimeter and are you familiar with using it to take resistance measurements?

Megawatt · Aug 18, 2019

Megawatt said:
Does the wires have numbers on them

When you took the cover off the motor did it have a wiring diagram inside the cover

Lucien Nunes · Aug 18, 2019

Doesn't make much difference MW, we can see the line and neutral going into the motor, but we don't know for certain which cores of the input cable those line and neutral correspond to, as there's a switch and possibly a junction box in the middle. We can't trust that the colours going in are the same as the ones coming out to the motor as it has been altered.

Megawatt · Aug 18, 2019

Lucien Nunes said:
Doesn't make much difference MW, we can see the line and neutral going into the motor, but we don't know for certain which cores of the input cable those line and neutral correspond to, as there's a switch and possibly a junction box in the middle. We can't trust that the colours going in are the same as the ones coming out to the motor as it has been altered.

Just trying to help since he came to us for help I understand what you are saying but it drives me crazy not being able to get his motor running. I’ve been on YouTube researching but you are right we can’t just assume anything

jinsingh · Aug 18, 2019

Megawatt said:
When you took the cover off the motor did it have a wiring diagram inside the cover

Hi

No wiring diagram anywhere at all I will second check to see if any numbers on wires. I will also open the base and see if I can check how the power wire joints the cable running to the motor

James · Aug 18, 2019

jinsingh said:
Hi

No wiring diagram anywhere at all I will second check to see if any numbers on wires. I will also open the base and see if I can check how the power wire joints the cable running to the motor

It looks from the picture that it is configured for single phase.
Presuming it’s 230v or there about, I would expect this to be a half hour job for anyone who is competent and has a good understanding of ac motors and there configuration for single phase use.
Where in Birmingham are you?
I might be passing you on Monday or Tuesday as I am working that area early week,

-

-

-

-

-

-

-

-

-

-

-

Attachments

-

-

-

-

-

-

-

-

-

-

-

Similar Threads

OFFICIAL SPONSORS