How to wire motor plug

[jinsingh]

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.

 

[Strima]

Looks like a forward and reverse switch is required. What do the manufacturers instructions say? Do you have a web link for this machine?

 

[Spoon]

Welcome to the forum mate.
The motor should have a information plate on it, with the spec of the motor. Take a pic and post it up. Post a pic of the motor as well. Are there any controls with the motor?

 

[netblindpaul]

If this was bought in the UK, the law states it must come with a fitted plug.

 

[jinsingh]

Looks like a forward and reverse switch is required. What do the manufacturers instructions say? Do you have a web link for this machine?

Hello thank you so much for replying, please find attached images of the machine and some specs, please not its a 220v machine.

 

[jinsingh]

Welcome to the forum mate.
The motor should have a information plate on it, with the spec of the motor. Take a pic and post it up. Post a pic of the motor as well. Are there any controls with the motor?

Hi thanks for replying, ive attached images of the machine. The machine is a 220v machine and is supposed to be single phase. It didnt come with a plug, the power cable has 4 wires which is confusing me.

 

[jinsingh]

I think the cable expects an American 4 pin plug??

 

[Strima]

That's a surface grinder not a polisher so you won't be getting many shiny things from that...

You need a motor reverse switch installing. Something like: Motor Reversing Switch single or 3 phase 25, 32 or 63amp 4 Pole Lathe car lift | eBay - https://www.ebay.co.uk/itm/Motor-Reversing-Switch-single-or-3-phase-25-32-or-63amp-4-Pole-Lathe-car-lift/331117252512?hash=item4d18204fa0:m:mwsgmUcdOA3BgKppYa0rovQ&var=540332832124

Ideally you need someone experienced with motor controls to install this for you.

 

[GeorgeCooke]

Wrong voltage, no plug, reject it. Simples.

 

[jinsingh]

That's a surface grinder not a polisher so you won't be getting many shiny things from that...

Ideally you need someone experienced with motor controls to install this for you.

H Strima thanks again for replying, I was wondering does it really need a motor reverse switch as it has a FORWARD/REVERSE switch already at the front of the machine.

 

[westward10]

Can you show the motor rating plate.

 

[Spoon]

It seems to state the motor needs 380V. You will only get this if the machine has something like an inverter in it.

Can you take a pic of the plate on the motor.


This might give us more info.

 

[Spoon]

Take some pics of what you actually have rather then from a brochure.

 

[jinsingh]

View attachment 51369

View attachment 51370

It seems to state the motor needs 380V. You will only get this if the machine has something like an inverter in it.

Can you take a pic of the plate on the motor.
View attachment 51371

This might give us more info.

Hi there I did pay for the 220v motor version. The problem is there is no plate or info anywhere on the machine.

 

[westward10]

Just wondering if that motor is three phase, 380v in star and 220v in delta. Your motor maybe pre wired for 220v delta, possibly.

 

[Spoon]

Looks like the only thing you can do is get inside the machine and see where the four wires wire to.

 

[James]

If you are still unsure, I am in brownhills on Monday and in the jewellery quarter on Tuesday and Wednesday
I will be able to either make it work or tell you what’s wrong with the specification.

 

[westward10]

The motor doesn't show a capacitor but could be split phase (single phase) but I suspect it is three phase and there is no reason for it to be reversible. The image of the machine does show a two position switch so maybe reverse capability is built into it.

 

[Megawatt]

Hi there I did pay for the 220v motor version. The problem is there is no plate or info anywhere on the machine.

Hi there I did pay for the 220v motor version. The problem is there is no plate or info anywhere on the machine.

Jingling these guys are good at what they do hang in there and they will get it ru

 

[Spoon]

Jingling these guys are good at what they do hang in there and they will get it ru

Did you have a power cut mate...

 

[jinsingh]

Im really really surprised and very pleased with all the time and help you have all given me. I really appreciate all your replies.

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)??

@Megawatt @Spoon @westward10 @James the Spark1976 @Strima

 

[Megawatt]

Im really really surprised and very pleased with all the time and help you have all given me. I really appreciate all your replies.

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)??

@Megawatt @Spoon @westward10 @James the Spark1976 @Strima

Yes the 4th wire as y’all know is just an equipment ground the 3 prong is the same as my stove. It’s 220vac single phase and the neutral is mainly for the clock and timer. I’m trying to research it for gingsing

 

[Spoon]

May also be worth it to try and find out what frequency this has been manufactured for. 50Hz, 60Hz or both?

 

[Megawatt]

Yes the 4th wire as y’all know is just an equipment ground the 3 prong is the same as my stove. It’s 220vac single phase and the neutral is mainly for the clock and timer. I’m trying to research it for gingsing

It also could be 220vac with no neutral the 3rd wire being the ground

 

[Megawatt]

It also could be 220vac with no neutral the 3rd wire being the ground

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

 

[Spoon]

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]

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]

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]

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]

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

 

[Spoon]

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]

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]

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]

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]

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]

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]

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]

I assume the flex terminates elsewhere.

 

[Megawatt]

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]

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