How to wire motor plug

jinsingh · Aug 16, 2019

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 · Aug 16, 2019

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 · Aug 16, 2019

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 · Aug 16, 2019

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

jinsingh · Aug 16, 2019

Strima said:
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 · Aug 16, 2019

Spoon said:
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 · Aug 16, 2019

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

Strima · Aug 16, 2019

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 · Aug 16, 2019

Wrong voltage, no plug, reject it. Simples.

jinsingh · Aug 16, 2019

Strima said:
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 · Aug 16, 2019

Can you show the motor rating plate.

Spoon · Aug 16, 2019

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.

[ElectriciansForums.net] How to wire motor plug

This might give us more info.

Spoon · Aug 16, 2019

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

jinsingh · Aug 16, 2019

Spoon said:
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 · Aug 16, 2019

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 · Aug 16, 2019

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

James · Aug 16, 2019

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 · Aug 16, 2019

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 · Aug 16, 2019

jinsingh said:
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 · Aug 16, 2019

Megawatt said:
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 · Aug 16, 2019

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 · Aug 16, 2019

jinsingh said:
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 · Aug 16, 2019

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

Megawatt · Aug 16, 2019

Megawatt said:
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 · Aug 16, 2019

Megawatt said:
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

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