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Inverter problem

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John Rudd27/04/2017 11:50:12
1479 forum posts
1 photos

Good to hear you got it sorted......wrong fox notwithstanding....

Remind me not to take you hunting.....cheeky

Andy Holdaway27/04/2017 12:05:23
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167 forum posts
15 photos

At least now you know the inverter IS set correctly!!

SillyOldDuffer27/04/2017 13:12:01
10668 forum posts
2415 photos

Thanks for reporting back Rod, I would never have thought of that and now I know! Well done you for fixing it.

Muzzer27/04/2017 13:35:29
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2904 forum posts
448 photos

That's the first mention of an overload relay - do you mean a DOL motor starter between the inverter and motor? If so, it's not clear why you have one of these. The motor should be wired directly to the inverter output which does a much better job of protecting the motor. And many inverters will get upset if you disconnect the motor under load.

Murray

Rod Ashton27/04/2017 14:28:40
344 forum posts
12 photos

Thank you Gentlemen! I was advised to use the Starter as an emergency stop. Wish now I had not been. However live and learn. John yes I have a large hole through my hunting boots.

Once again I do much appreciate the kind advise.

jason udall27/04/2017 15:17:39
2032 forum posts
41 photos
So you have in effect got the original 3 phase overload/switch gear "in the way " between inverter and motor.

As has been said ..bad idea.
Bad for inverter( they don't like their load going missing during run condition)
Waste of the more finessed overload control the inverter provides.
.

In any case if possible use dol ( which retains the overload protection and handy emergency stop functions) between supply and inverter..and inverter directly to motor..
No reverse switch ..let inverter do this if needed
If you have a hi/low switch gear on lathe then this can be used ( only with inverter off) ...but allowing for the increased current rating.
( I wouldn't use, it lock it in low and feed higher frequency for higher spindle speeds) br />)

Edited By jason udall on 27/04/2017 15:21:39

Russell Eberhardt27/04/2017 15:37:30
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2785 forum posts
87 photos
Posted by jason udall on 27/04/2017 15:17:39:
As has been said ..bad idea.
Bad for inverter( they don't like their load going missing during run condition)
Waste of the more finessed overload control the inverter provides.

Agreed.

You should be able to wire an emergency stop button to the inverter I/O connections.

Russell

jason udall27/04/2017 15:42:46
2032 forum posts
41 photos
Indeed. I would put E stop into the drive...
But the OP and his electrician might take the more obvious route of a DOL to protect / isolate the inverter and all downstream.

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