Starters and motors

[Silly Sausage]

The fault was bandsaw not working. It also has a dust extractor tapped off it

1: Determine make and model of said saw.
2: Ask Maintenance if they've got a manual for it.
if not,
3: Get online and see if you can find one.
if not .......

 

[Marvo]

The only explanation of getting 230v from all terminals to earth and 0 v between the terminals themselves is that there's only asingle phase being supplied to the motor. That's the easy bit, the difficult bit is figuring what's causing that condition. Maybe the contactor was not energised but one of the contacts is welded closed due to a fault current that occurred previously but then the question becomes what was the earth or the s/c fault.

 

[netblindpaul]

That's a Klinger & Born DOL starter with O/L & d.c. injection brake.

 

[ipf]

The only explanation of getting 230v from all terminals to earth and 0 v between the terminals themselves is that there's only asingle phase being supplied to the motor. That's the easy bit, the difficult bit is figuring what's causing that condition. Maybe the contactor was not energised but one of the contacts is welded closed due to a fault current that occurred previously but then the question becomes what was the earth or the s/c fault.

Just going to ask if he'd checked the fuses:icon12:

 

[i=p/u]

Tell me more netball

 

[Marvo]

Thanks Paul, I was hoping someone would recognise it.

 

[netblindpaul]

It's what I do for a living remember, not recognising, but machinery stuff, from fixing, to designing, to consulting on CE & PUWER in the main.

 

[i=p/u]

Which fuses Ipf ? On the circuit board? Yes there's one which Belleyed out.

theres 400v at dol starter but only 230v at motor casing.

when you hit the start button , the extractor kicks in, the pulls out again and there's a burrRRrr sound but blade don't rotate.

and believe me when I say I ain't fixing this . But would love too some day lol

 

[ipf]

Which fuses Ipf ? On the circuit board? Yes there's one which Belleyed out.

theres 400v at sol starter but on 230v at motor casing

Fair do's.....but we're all guessing a bit at fault finding without being on the spot.

 

[i=p/u]

So why pcb board netball? What we got here

 

[Darkwood]

When you test the motor have you pressed the start or are you testing it when it supposed to be off, some old machinery only had switching on 2 phase leave one phase energised and also O/L motor protection can be found on 2ph only, it can be a number of reasons why your getting your readings and without knowledge and experience you need to leave well alone, you'll be surprised how fast not knowing what your doing can escalate the costs and most of it probably caused by yourself not following procedure for checking and testing motors and control circuits.

It would probably take me less than 5 minutes to test and identify the issue while not causing any further damage but this is because this is what I do for a living ... sometimes enjoyable and others not (-4 degrees monday morning at stone yard chipping ice out of a pump I dismantled comes to mind)...

I would in your case put it back as found and advise to call in someone experienced in this field because I see the problems caused by curious sparks trying to solve these problems and it usually isn't pretty and can be costly to said sparks after I've done a report.

I would need to be onsite to resolve this for you as its very difficult to advise on the forum only .... what I find will denote the actions and tests I carry out.

PS when you here the motor buzzing you could be causing damage to it which may require a rewind or new motor whichever may be most cost effective.

Edit just noted you said your not getting involved any further ...

 

[i=p/u]

The squirrel cage is a robust motor hahahahhahahahhhahahah

 

[i=p/u]

I don't know , I just had nosey.

 

[Darkwood]

The squirrel cage is a robust motor hahahahhahahahhhahahah

Any motor in good condition will survive if the protection is set right and adequate ... the problem is this is not the case with half the crap out there .... ...if the motor hums and doesn't move you are turning the windings into a heater coil tht will self destruct if not stopped ( In the case of a standard squirrel cage)

 

[telectrix]

But as said why only getting 230v motor connections,

why nit not just break live with e stops , forget control boards ...

stupid boy, pike.