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Topic Title: Motor problem
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Created On: 17 May 2013 04:10 PM
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 17 May 2013 04:10 PM
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Avatar for OldSparky.
OldSparky

Posts: 592
Joined: 28 June 2011

ok peeps for you motor geeks out there..

connected a brand new 3ph motor today ( in delta) on a conveyor and it tripped out.

Thinking the belt was maybe jammed, took the motor off and started it up, it first went one way then the other then tripped out?

So just to try things i swapped 2 phases and the same thing happened,

any ideas anyone.

Paul
 17 May 2013 05:20 PM
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Wessex

Posts: 76
Joined: 26 June 2009

Check to see if it is a dual voltage motor. 220Vac three phase connect as Delta. 400-415Vac three phase, connect as star. The plate on the motor can be of some help. The two voltage ranges can be separated by a slash ( / )

Edited: 17 May 2013 at 05:27 PM by Wessex
 17 May 2013 06:01 PM
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Avatar for colinhaggett.
colinhaggett

Posts: 364
Joined: 08 July 2004

Since it's new, could be that it's been assembled wrong?
 17 May 2013 06:05 PM
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Avatar for Legh.
Legh

Posts: 3485
Joined: 17 December 2004

I'm not a motor geek but it appears that the overload is set too low for a delta start.
You might try testing it again by connecting the windings in a star configuration.
On the the hand, some stator windings have something more complex than multiples of three coils in parallel.
So you might care to RTFI before kick off......


Legh

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 17 May 2013 06:12 PM
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statter

Posts: 126
Joined: 06 February 2013

You might try comparing the winding resistances too as well as a furth insulation test. It's not unknown for new kit like this to be defective.
 17 May 2013 06:19 PM
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Jaymack

Posts: 4638
Joined: 07 April 2004

Originally posted by: OldSparky
any ideas anyone.

Bad connection on one incoming phase, or on the motor windings. Is the conveyor loaded?, the motor may not be able to start if designed for no load starting. Is it an incliine conveyor?, it may be "running" backwards in a tripped condition, due to an overhauling load. Is the motor rated for the duty?

Regards
 17 May 2013 07:09 PM
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Pacific

Posts: 590
Joined: 29 January 2005

Sounds like a phase or winding down to me
 18 May 2013 06:42 PM
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Avatar for OldSparky.
OldSparky

Posts: 592
Joined: 28 June 2011

Originally posted by: Wessex

Check to see if it is a dual voltage motor. 220Vac three phase connect as Delta. 400-415Vac three phase, connect as star. The plate on the motor can be of some help. The two voltage ranges can be separated by a slash ( / )


i think it is this.. remember seeing 2 voltages on the plate, took no notice

will check next week

thanks
 20 May 2013 03:55 PM
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zeeper

Posts: 1409
Joined: 11 July 2008

took the motor off and started it up, it first went one way then the other


IS the motor started with Direct On line(DOL) contactor

or

IS the motor started with a star delta contactor.

If star delta start there could be a problem with the phase conductor wiring being crossed over from the contactors.
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