Hi Guy's thanks in advance for reading. I have coming a 3 phase in and out vfd which will be derated to take single phase 220/240vac.I have never done 3 phase wiring and was hoping some one could assist with what colours go to what positions on the motor side of the vfd IE:- U,V,W and where do the other wires go ?

 

RST is the Mains input L 1, L2, L3,

U V W is the motor output .

To reverse the motor swap any two terminals UVW.

 

Single phase in on R&T.
There is specialized cable for the UVW supply to the motor, The alternative is to use MTW, Machine Tool Wire and use a metalic flex conduit.
The former is really only needed if you are using one of the H.S. motors at 400Hz.
Don't forget the earth wire!
What make of VFD?
Max.

 

On my Jaguar Cub single to 3phase 3kW VFD for lathe in UK (looks like colours are same for Oz). Check appropriate current rating. I use 4mm cable for 32A input and for output.

INPUT:
Live (brown) to R, Neutral (Blue) to T. Don't forget protective ground (Green/yellow) from incoming cable to main VFD chassis ground point.

OUTPUT:
U/L1 Brown, V/L2 Black, W/L3 Grey. Again, protective ground (Green/yellow) from main VFD chassis ground point to conduit and motor casing.
I managed to find 3 metres of 4-core 4mm cable equivalent to RS part 902-8344 as its best to use the right stuff.

 

RST is the Mains input L 1, L2, L3,

U V W is the motor output .

To reverse the motor swap any two terminals UVW.

thanks Dave

 

Single phase in on R&T.
There is specialized cable for the UVW supply to the motor, The alternative is to use MTW, Machine Tool Wire and use a metalic flex conduit.
The former is really only needed if you are using one of the H.S. motors at 400Hz.
Don't forget the earth wire!
What make of VFD?
Max.

Hi Max here is the link. I purchased the 7.5kw to run a 4kw motor https://www.ebay.com.au/itm/0-75KW-7-5KW-Single-To-3-Phase-Variable-Frequency-Drive-Inverter-VSD-VFD-AU/123090582720?ssPageName=STRK:MEBIDX:IT&var=423509941047&_trksid=p2057872.m2749.l2649 specialized cable? What does it do different please (shielded)? The Vfd is to run a 3 phase Pilot 30cfm 5.5 hp air compressor on single phase,It will have a dedicated 4mm circuit aprox 5 meters long from the meter box with a 20 amp rcd/bo .The compressor will be in a vented enclosure

 

Either one of these do ?https://lappaustralia.com.au/en/servo-static-4g4 or https://lappaustralia.com.au/en/servo-drag-chain-pur-4g4 or perhaps these? https://lappaustralia.com.au/en/vfd-2xl-4g4 https://lappaustralia.com.au/en/vfd-2xl-4g4awg https://lappaustralia.com.au/en/lapp-350183428-428 https://lappaustralia.com.au/en/vsd-flex-4g4-3-e-2

 

Yes, though the second has 2 extra control cores you don't need to pay for, and these are screened cables which isn't essential for this application.

Have a look at:

https://www.ebay.com.au/itm/4-mm-4-...ber-Insulated-cord-05-meter-long/111061133325

https://www.ebay.com.au/itm/HO7-Fle...d-Single-Three-Phase-3-Phase-3Ph/163314525400

 

Hi Max here is the link. I purchased the 7.5kw to run a 4kw motor specialized cable? What does it do different please (shielded)? The Vfd is to run a 3 phase Pilot 30cfm 5.5 hp air compressor on single phase,It will have a dedicated 4mm circuit aprox 5 meters long from the meter box with a 20 amp rcd/bo .

If running a normal 50hz/60hz motor off the VFD then you can get away with normal machine wiring, rather than specialized shielded cable, although, it is best to run in metallic conduit of some kind to the motor, I tend to use metallic flexible and ordinary MTW stranded wire. Ensure it is twisted throughout the length, the GND wire ran along side.
The VFD appears to be one of the Chinese Huanyang knock-offs?
Max..

 

If running a normal 50hz/60hz motor off the VFD then you can get away with normal machine wiring, rather than specialized shielded cable, although, it is best to run in metallic conduit of some kind to the motor, I tend to use metallic flexible and ordinary MTW stranded wire. Ensure it is twisted throughout the length, the GND wire ran along side.
The VFD appears to be one of the Chinese Huanyang knock-offs?
Max..

Yes most likely a knock off .The booklet states Isacon Power Tech Co LTD --A2 series.Machine wiring cable what are the specs so I can search for the equivalent in Australia please.Irving suggested this cable https://www.ebay.com.au/itm/HO7-Fle...d-Single-Three-Phase-3-Phase-3Ph/163314525400.

 

That appears to be what used to be called Cab-Tire cable, now a few designations, but ideally run it in flex conduit, if the motor is constantly moving as per a Z axis etc, it may pay to use the H.F. flexible screened cable used on the 400Hz motors.
You can also add a 3phase inductor choke on the output, this will cut down on the radiated noise.
One of the first Manuf. to issue the specialized cable here was Beldon, not sure of the Aussie sources.
Max.

 

That appears to be what used to be called Cab-Tire cable, now a few designations, but ideally run it in flex conduit, if the motor is constantly moving as per a Z axis etc, it may pay to use the H.F. flexible screened cable used on the 400Hz motors.
You can also add a 3phase inductor choke on the output, this will cut down on the radiated noise.
One of the first Manuf. to issue the specialized cable here was Beldon, not sure of the Aussie sources.
Max.

Here is an attached pic of the compressor minimal motor movement

 

Yes, though the second has 2 extra control cores you don't need to pay for, and these are screened cables which isn't essential for this application.

Have a look at:

https://www.ebay.com.au/itm/4-mm-4-...ber-Insulated-cord-05-meter-long/111061133325

https://www.ebay.com.au/itm/HO7-Fle...d-Single-Three-Phase-3-Phase-3Ph/163314525400

Thanks Irving

 

So I assume you are using the VFD just to convert to 3ph and run the motor at it's rated frequency?
In the kind of installation you show, I would have ran TEW/MTW stranded in metal flexible liquid seal conduit.
Any local electrical supplier would have it, or even if you run the rubber sheathed 4 core inside it for protection as well as EMF shielding.
Max.

 

jonnydolt, what's the environment you're running the compressor in? My VFDs ran static lathe and milling machine motors in my shed/garage and I just used the rubber sheathed cable from VFD on wall to motor, and made sure cable was suitably strain relieved both ends (at wall and motor). EMF wasn't an issue, there was nothing susceptible within 20m and nothing showed any issues even in the garage itself.

Max is right though that in a commercial environment you'd want to run cable in a grounded protective conduit and a flexible sheath from wall to machine for H&S reasons.

 

What I have done in the past where non-VFD rated/standard motors are used, is to also install a 3ph line choke/reactor on the 3ph output, this not only gets rid of radiated interference, but makes it easier on the motor by removing the HF EMF that exists on the 3ph signal.
It also has a benefit for the VFD itself.
Max.