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Old 03-12-2017, 11:26 PM   #11
Nick Hulme
 
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Call it a night, hit the turps and sling in a warranty claim, it's clearly rooted!


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Old 03-13-2017, 03:46 AM   #12
Johno1958
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Motor has got no play and turns over smooth except ripply sort of feel like a stepper motor, but that's it for me ,they can fix it.
John


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Old 03-18-2017, 02:38 PM   #13
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Originally Posted by Nick Hulme View Post
Call it a night, hit the turps and sling in a warranty claim, it's clearly rooted!

I agree, mess with it too much and the OP will end up getting blamed.

Greg
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Old 03-18-2017, 07:21 PM   #14
Ken I
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Motor has got no play and turns over smooth except ripply sort of feel like a stepper motor, but that's it for me ,they can fix it.
John
That "ripply" feel is indicative of some sort of problem - sounds like a permanent magnet (PM) motor with an armature winding short - could be as little as a single loop - but it plays havoc with the VFD. The motor fails to vector smoothly and sounds can vary from the delicate tinkling of tumbling broken glass to a cement mixer filled with scrap iron.

If it is a PM motor then you can test drive it with a cordless screwdriver (effectively driving the PM motor as an alternator) and measure the three output phase voltages (disconnected from the VFD for this test) one phase will be low - there's your problem.

You might also have a phase short.

If it's a squirrel cage rotor then none of the above apply and I'm baffled.

Regards,
Ken


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