Starters and motors

[Marvo]

Was the motor running?

 

[davesparks]

Guys and divas , I only check power at devices after that the boss sends it back for specialist which I asumme in this case is an electrical engineer .

If you don't understand the basics of motor control then how do you know what you are testing for or what test equipment is appropriate/safe to use?

 

[i=p/u]

Dave not my job now so fuk it . Just a little interested .

 

[elevate]

Its not a drive in the picture, the circuit board looks like some sort of RC circuit, could be for soft start or noise suppression. Any wiring diagrams?

 

[i=p/u]

And out of interest its a band saw. With two emergency stops onit plus start stop button

 

[Marvo]

It's not a drive and it's a bit elaborate for a suppression board plus there's no ground on it. Maybe soft start but I can only see 2x components on the heat sink so also unlikely.

You didn't say if the motor was running or not. What was the fault they reported and what was the application or machine it was a part of?

 

[Silly Sausage]

View attachment 27778 Dave not my job now so fuk it . Just a little interested .

Who pulled all the inards out?

 

[Marvo]

My tying is too slow, it's probably the control board for the interlocks / estop etc. In that case the motor looks like it's direct on line so I give up about your weird test results in that case.

 

[i=p/u]

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

 

[i=p/u]

But as said why only getting 230v motor connections,

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

 

[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