Thread: VFD for 3 Phase Mini 30

They say it a little better than I could HowTo: 240V Supply to a 400V AC Motor - Application Detail

Originally Posted by gorriss

So to clarify, the motors aren't dual voltage 240/415 wired in delta for 240V but are actually wired for (expecting) 415V.

Correct.
BTW I wouldn't do this on something like a TS that really does require the full power rating of the motors

Sorry, what's a TS?

Originally Posted by Bob Willson

I am almost certain that he is not telling the truth here. The motors are a complete unit in and of themselves, so it should not matter what they are driven by.
This sounds a little like Telstra not taking responsibility for their phone lines unless you use one of their telephones. I would definitely check this out with the ACCC.

I was wrong.
They state both in their operating instructions and also in their warranty that it is mandatory to use their WEG VFDs with their Wmagnet motors.

Originally Posted by Stustoys

Hi Graham
Did you tell him it was 3.1hp at 440V?

Stuart

Just did the maths as you say 3.1hp @ 440V = 2.9hp @ 415V.
I was a little worried as the motor info plate says HP 3.1/2.5 (But actually 3.1hp = 2.3Kw.)
I assumed the 2.5 was Kw which at 415V would equate to 2.35Kw but I think it is hp for the 2 pole or 4 pole set up. So when its half speed (4 pole I presume) it is only 2.5hp. When it is full speed (2 pole) it is 3.1hp. Does that sound correct?
I did ask Dave last night about the fact that is was 440V and he said I can set the voltage on the inverter to 415 or 440 or anywhere in between. So presumably I set it at 415V and it should be OK.
Graham

Originally Posted by gorriss

but I think it is hp for the 2 pole or 4 pole set up. So when its half speed (4 pole I presume) it is only 2.5hp. When it is full speed (2 pole) it is 3.1hp. Does that sound correct?

Well I cant tell you which hp is for 2 pole and which is for 4 pole but yes 3.1hp and 2.5hp sound correct. (though I certainly cant explain why).

Originally Posted by gorriss

I did ask Dave last night about the fact that is was 440V and he said I can set the voltage on the inverter to 415 or 440 or anywhere in between. So presumably I set it at 415V and it should be OK.

Ok we really are out of my depth now. I dont believe changing the max voltage on the VSD changes the Max output Voltage at all. As I understand it the max Voltage is fixed by the line voltage. The max voltage number is just used to work out what V and C the VSD should output below the Max.
I think.
Having said that, my Teco doesnt have setting for motor V(though I assume there are many setting I cant get to on the Teco as it only has 30 odd settings, the huanyang VSDs have more like 180 settings)
Having said that if Dave from DD can indeed set the Max V to 415.... you should (I think) be set.

Hows that for dodging and weaving post?

Please forget my post #50 as its a complete load.
If you had it on 4 pole, running it at 100Hz would still only be 2800rpm

Stuart

Hi Stuart
I have to ask...
I am busily trying to sort this all out and get my machine working hence my being glued to the PC for hours at a time. What's your excuse?

PS. Don't stop you have been a great help

Cheers
Graham

Well I do have wireless in the shed but its a little on the warm side out there just at the minute so I havent spent a lot of time out there today. Besides while I read the forum on my tablet or phone I hardly ever reply on them.

Stuart

Well I am about to seal the deal on the 240-415 inverter from Drives Direct. My 3.1hp motor is rated at 4.5 amps. The inverter is rated at 4.6 amps so it should be OK as long as not in commercial use. The 3.1hp is only for the spindle moulder so shouldn't be a problem. Apparently the voltage and horsepower ratio does not mean anything, it is always trying to produce the same hp and the current draw will vary as required. Looks like about $658 all up including remote POD on/off switch. I hope I've done the right thing?
Graham

The deal is done!
Being posted tomorrow
Do you remember how long yours took to deliver Stuart?
Graham

Originally Posted by gorriss

Apparently the voltage and horsepower ration does not mean anything, it is always trying to produce the same hp and the current draw will vary as required.

Not sure I understand that or the "commercial use" comment, but if he is happy it will work and your happy, I'm happy.

Stuart

p.s. I paid for mine on 26/7 3:45pm, it arrived on 3/8

Originally Posted by Stustoys

Not sure I understand that or the "commercial use" comment, but if he is happy it will work and your happy, I'm happy.

Stuart

p.s. I paid for mine on 26/7 3:45pm, it arrived on 3/8

Basically he said if I am not running it 8 hours a day it should be fine. Paid $650 including remote switch and freight. Fair bit cheaper than 2 motors plus VFD plus pulley, and much easier solution. Thanks for the heads up.
Graham

Dave told me the inverter (240 single phase - 415V three phase 3hp) is rated at 20 amps and should have a 20 amp circuit breaker. I currently only have a 10 amp mixed circuit (lights & power on one breaker) to my shed. I plan to upgrade the main line coming into the shed and put a sub board in the shed. I will have in the shed:

1. The 10 amp mixed circuit
2. The 20 amp inverter
3. Possibly another 15 amp power point would be wise while I am at it.

The 20 amp and 15 amp circuits would be concurrent (ie only used separately) so I guess I need to allow for 30 amps coming in. The distance is about 15 meters. I will get a sparky to hook everything up, but I plan to do all the ground work running the cables and fixing the inverter etc before hand to save on labour costs. I was thinking a 4mm cable into the shed, but will that be big enough? Maybe I should go 6mm? Also given the inverter draws 20 amps, the 240V line from the sub board to that would need to be 4mm I presume?

Also can anyone tell me what wire is required for the remote switch?
Graham

Cant help with the 240V side of things sorry. Best ask your sparkie whats needed rather than buy something and find out he wont sign off on it. I guess a second hand sub panel would be against code? pitty I have a couple that might do the job for you.

Pretty much any old wire will do for the control side of things unless you are going to run it in the same conduit as the 3 phase wiring.
Or do you mean how many core?(which remote did you buy?)

A little light reading for you. Bare in mind this maybe out of date but hopefully most of it will be the same. No guarantees though.

Stuart