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Matching motor, VFD and house current
Posted: Wed Mar 18, 2015 5:59 pm
by batavia
Looking to install a .5hp, 1800rpm motor with a VFD control. Is it advisable to connect this set up with my 110 current or should I run a 220 and them match the motor/device to that? Thanks guys. Dave
Re: Matching motor, VFD and house current
Posted: Wed Mar 18, 2015 6:17 pm
by LatakiaLover
The only thing I know is a true VFD, as opposed to a rheostat speed control, requires a 3-phase motor.
The rest I leave to a friend of mine who has been in the VFD/industrial motor controls business for 25 years.
Re: Matching motor, VFD and house current
Posted: Wed Mar 18, 2015 6:29 pm
by Mark B.
Mine is running on standard 110 house current since last August. No problems. I think it only goes to 1250 RPM.
Disclaimer: I know next to jack-nothing about electricity.
Re: Matching motor, VFD and house current
Posted: Wed Mar 18, 2015 7:11 pm
by andrew
The controller must be compatible with your power supply. They come in a variety of configurations, but we typically use 110 and 220 supply. The motor must be three phase if you are using a vfd (unless it's DC).
Re: Matching motor, VFD and house current
Posted: Wed Mar 18, 2015 10:23 pm
by wdteipen
Cheapest setup is going to be 110 in to VFD 3 phase out to 3 phase motor. .5HP motor is plenty. VFD needs to be rated for the HP of the motor so you'll want a 100v to 3 phase .5 HP VFD for your 3 phase .5HP motor. Speed isn't as big a factor since it's controlled by the VFD but 1725 or 3250 rpm will work fine. It's much more simple than it seems.
Re: Matching motor, VFD and house current
Posted: Wed Mar 18, 2015 11:32 pm
by oklahoma red
The best bang for the buck is what is shown in Mark B's pic: Automation Direct motor and controller. I have two of these and they work great. Nate has several in his new shop and numerous others here also use them. Motor part number: MTR-P50-3BD36 (3600 rpm,230 volt, .5 HP 3 phase). Drive unit part number: GS1-10P5 (110 V single phase in and 230 volt three phase out to the motor). It is also available as 220 v input (GS2-20P5). The drive unit has a lot of programmable functions. The controller will overdrive the motor by a considerable amount if so desired. The motor can also be had in a 1800 rpm version.
If you are into shaping by wheel this is a great setup.
Re: Matching motor, VFD and house current
Posted: Thu Mar 19, 2015 2:40 am
by andrew
That's what I have with a 3/4 hp motor. It's fantastic.
Re: Matching motor, VFD and house current
Posted: Thu Mar 19, 2015 5:01 pm
by batavia
Thanks for the great info. everyone.
Re: Matching motor, VFD and house current
Posted: Wed Apr 01, 2015 12:05 am
by E.L.Cooley
Really with a 110v you could run a single phase or three phase 240v motor on a vfd. It is important to make the right selection. Regarding hp output and when being creative never select a vfd with bypass. It all has to do with amp draw and how you wire the drive. Credential 18 years Hvac service installed over a hundred drives. A speed controlled 5/8 shaft motor will be my next upgrade.
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