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Anonymous Poster #1

Delta Connected Motor to VFD

07/01/2018 4:52 PM

We have six terminal outgoing terminals from a VFD to a motor. It means the motor is delta connected. why not the Motor have a Delta winding Internally or delta connected through links or through cables. why we need to run a cables from the VFD to the motor for making a delta connection?

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#1

Re: Delta Connected Motor to VFD

07/01/2018 7:36 PM

Why six wires? Maybe so you can easily read or monitor the current in each motor winding.

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#2

Re: Delta Connected Motor to VFD

07/01/2018 7:43 PM

If it is not stolen, it should have come with an operator's manual. That is likely to have a wiring diagram.

If not, ask the manufacturer for one.

If all else fails, hire a tech that knows VFDs and motors.

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#3

Re: Delta Connected Motor to VFD

07/01/2018 8:32 PM

I think you have some faulty information....what is the VFD brand and model #? Is this a 2 speed motor? Is this the original motor? What other info do you have on the motor? What type of equipment is this on?

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#4

Re: Delta Connected Motor to VFD

07/02/2018 2:54 AM

Are you sure its a VFD and not a StarDelta starter?

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Anonymous Poster #1
#5

Re: Delta Connected Motor to VFD

07/02/2018 11:48 AM

I have attached the terminal details of VFD in the link,

https://www.dropbox.com/s/syemub2szqbdv2e/Power%20and%20control%20cables%20arrangement.pdf?dl=0

The load is a compressor Motor. I don't have the motor drawings. The VFD make is Fuji Electric's Frenic Eco Series

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#6

Re: Delta Connected Motor to VFD

07/02/2018 12:58 PM

It appears as though that inverter was modified to run two motors from the one inverter. If you look carefully, each of the terminal pairs is labeled the same: U1, V1, W1.

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Anonymous Poster #1
#7
In reply to #6

Re: Delta Connected Motor to VFD

07/02/2018 2:49 PM

JRaef,

If you closely look at the right side terminals, (Y, X, Z) is written in that attachment, which implies that it is a delta connection. Sample image below,

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#8
In reply to #7

Re: Delta Connected Motor to VFD

07/02/2018 8:05 PM

I think you are reading too much into this. But what do I know? I’m not there...

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#9

Re: Delta Connected Motor to VFD

07/03/2018 2:26 AM

The 6-terminals at motor may not be for Delta connection.

Could it be that the motor has two windings internally!

The 'One-channel 12/12 -pulse series connected LCI drive' supplying the two windings!!

Could you get hold of the motor winding connection diagram (Motor name plate may have it)!!

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#10

Re: Delta Connected Motor to VFD

07/14/2018 2:22 AM

Are sure the 6 terminal are for the motor winding?..

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