3phase problem

[stevethejoiner]

If ,as you say, you have connected the plug as advised by the refurbishers & your other machines work ok in the socket then it seems most likely to be a problem with the machine.

Yes I am guessing that much. But I really wanted to get opinions before I contact the refurbisher today, as I am no sparky and didn't want to look a fool if I was overlooking something.
It's a problem when buying something off the net that's at the other end of the country, they are not going to be able to come over and just check it out, I'll possibly have to be sending it back, or invoicing them for a qualified machine engineer to get it working.
Thanks

 

[333rocky333]

With the power OFF its worth looking inside the starter, there may be overloads and simply set too low for the moter

 

[333rocky333]

On some old DOL starters, the green press putton would directly press the contactor contacts in, until the hold on contact took over.

Cant say ive seen them, but i will take your word for it.
Would be a definate no no nowadays I would have thought, but as you know theres still plety of old gear still in use

 

[stillp]

On some old DOL starters, the green press putton would directly press the contactor contacts in, until the hold on contact took over.

Cant say ive seen them, but i will take your word for it.
Would be a definate no no nowadays I would have thought, but as you know theres still plety of old gear still in use

Wadkin certainly used to use those starters, but if this was one of those then the motor would run as long as the green button was depressed.

 

[stevethejoiner]

I have spoken to the seller/refurbisher today and he says the machine was running fine before it left them. So I have arranged for an electrician who specializes in machine motors and rewinds to run some tests tomorrow to identify the problem.
So for now thank you all for your comments and suggestions.
I will update you tomorrow if we find out whats wrong.
Thanks, Steve.

 

[ericmark]

I have read posts with interest and tried to think of a scenario that would cause what is reported.

With overload set to auto reset and also set too low it would allow the motor to kick then nothing until it auto reset.

However it was tested before it was delivered to you and was OK.

So what could be different with your supply and the refurbish firms supply? If the supply it was tested on had a large volt drop and yours does not then yes you could get this situation.

This however seems unlikely but maybe the machine was tested and then the starter fitted and some one forgot to set the overload?

The only thing therefore I can think of is the overload is not set to the correct setting for the motor.

Thinking back I have had this problem with water pumps. With a water pump you burn the rubber of the volute to match impeller and being in a hurry I remember switching the pump off before it had fully bedded its self in. While running the load of burning in was not a problem but once stopped it would not restart. Cure was to back off volute and then bring it back again while running.

It is possible there is some similar process with your machine and it has just simply not been run for long enough before switching off. Or of course something has happened while on-route which has caused the machine to bind.

 

[stillp]

I reckon a wire has come loose in the starter.

 

[JohnW2]

So what could be different with your supply and the refurbish firms supply? If the supply it was tested on had a large volt drop and yours does not then yes you could get this situation.

If that's true (I don't know), you would not necessarily have to have any appreciable within-installation VD, given the large variation in supply voltage which is permitted at the origin of the installation. At the extremes of 'permitted' it could have been tested with a supply of 375V and now being tried with a supply of 438V - a difference of 63V between-phases.

Kind Regards, John

 

[stillp]

Just another thought - is the power feed engaged? Maybe it needs to run up to speed before engaging the feed drive.

 

[stevethejoiner]

Just another thought - is the power feed engaged? Maybe it needs to run up to speed before engaging the feed drive.

I does have a slow and fast speed, but I have been trying to start it while in neutral.

 

[stevethejoiner]

I reckon a wire has come loose in the starter.

I have looked in the starter, and all connections are tight and secure, so it's not that. But thanks.

 

[stevethejoiner]

I have not had the electrician look yet, but i thought these photos may help explain what i have.

 

[ban-all-sheds]

3 phase

 

[Aragorn84]

Is that an earth connected to one of the phases of the motor starter/overload?

 

[ban-all-sheds]

And where's the blue come from?