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Delta Unisaw 34-771 - Looking at a VFD. Will this one work?

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Forum topic by percent20 posted 02-25-2019 08:03 PM 1973 views 0 times favorited 8 replies Add to Favorites Watch
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percent20

18 posts in 656 days


02-25-2019 08:03 PM

Topic tags/keywords: unisaw question vfd delta electric tablesaw

I recently bought a used Delta Unisaw 34-771. It is 3-phase and 3 hp motor. We tested it at my in-laws house who has 3-phase run to their shop, and the saw does work.

Now I am wanting to move it to my shop where I don’t have 3-phase, so I was wanting to get a VFD for it so it can run at a full 3 HP. Plus if I run across other 3-phase tools I have the possibility of running those too.

For those in the know. Will this one work?
It all seems to line up from specs, and it has a 3 year warranty.

https://www.wolfautomation.com/ac-drive-3hp-10-5a-ct-vt-230vac-1-3-phase-f2-1/

I just want to get another opinion before I pull the trigger.

-- My Attempt at Instagram: https://www.instagram.com/buddylindseyjr/


8 replies so far

View MrUnix's profile

MrUnix

8279 posts in 3113 days


#1 posted 02-25-2019 09:21 PM

That one will work fine, but is rather on the expensive side IMO. You can get other Westinghouse (TECO) drives for almost half that (and even cheaper if you don’t want/need the sensorless vector ability).

Quick question – what is the FLA on your motor?

Also, you mention running additional machines with it in the future… which is not really recommended. VFD’s are generally single use and machine specific, since they need to be ‘programmed’ for the motor and application being used. It is possible to, for example, wire the output of it to a plug and use that plug for multiple machines, but you would either need to re-program it each time you switched machines, or you would loose protection and efficiency by leaving it at some generic setting. IMHO, they are now cheap enough to have one for each machine, which in turn will make the machine plug-n-play with any standard single phase 240v service, instead of being restricted to only locations that can provide three phase service.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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percent20

18 posts in 656 days


#2 posted 02-25-2019 09:32 PM


That one will work fine, but is rather on the expensive side IMO. You can get a Westinghouse (TECO) drive for almost half that (and even cheaper if you don t want/need the sensorless vector ability).

Quick question – what is the FLA on your motor?

Cheers,
Brad

- MrUnix

Thank you the info. More to research :D

The FLA is 7.4

-- My Attempt at Instagram: https://www.instagram.com/buddylindseyjr/

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MrUnix

8279 posts in 3113 days


#3 posted 02-25-2019 09:43 PM

The FLA is 7.4
- percent20

Then you don’t need a ‘3hp’ drive. If you want a sensorless vector drive (which is overkill on a table saw IMO), you can get the TECO L510-202 for half of what the E510 costs, or you could get a V/Hz version, the TECO FM50-202 for even less. Both of those can provide up to 7.5A, which is more than sufficient for your motor.

Full disclosure: I have the FM50 on my 3hp Unisaw and love it. Hardest part was trying to figure out where to mount it.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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HokieKen

15316 posts in 2053 days


#4 posted 02-25-2019 09:49 PM

FYI, I have one of these for my belt grinder. I also know a few others who have used that brand with good success. The cost is highly desirable obviously but it’s not a sealed unit so you will have to mount it in an enclosure or somewhere that dust from your machines won’t kill it. It’s not a vector drive but I can’t see any reason you would need that for a table saw unless you’re planning to vary speeds and require precision in the control.

Just another option to consider! Congrats on the new saw :-)

-- Kenny, SW VA, Go Hokies!!!

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percent20

18 posts in 656 days


#5 posted 02-25-2019 09:49 PM


The FLA is 7.4
- percent20

Then you don t need a 3hp drive. If you want a sensorless vector drive (which is overkill on a table saw IMO), you can get the TECO L510-202 for half of what the E510 costs, or you could get V/Hz version, the TECO FM50-202 for even less. Both of those can provide up to 7.5A, which is more than sufficient for your motor.

Full disclosure: I have the FM50 on my 3hp Unisaw and love it. Hardest part was trying to figure out where to mount it.

Cheers,
Brad

- MrUnix

WOW thank you for the great information and links this really helps a lot in trying to figure things out.

-- My Attempt at Instagram: https://www.instagram.com/buddylindseyjr/

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percent20

18 posts in 656 days


#6 posted 02-25-2019 09:50 PM



FYI, I have one of these for my belt grinder. I also know a few others who have used that brand with good success. The cost is highly desirable obviously but it s not a sealed unit so you will have to mount it in an enclosure or somewhere that dust from your machines won t kill it. It s not a vector drive but I can t see any reason you would need that for a table saw unless you re planning to vary speeds and require precision in the control.

Just another option to consider! Congrats on the new saw :-)

- HokieKen

Thank you. So many options.

I am super excited about the saw. I can’t wait to get it running, and cleaned up.

-- My Attempt at Instagram: https://www.instagram.com/buddylindseyjr/

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percent20

18 posts in 656 days


#7 posted 03-05-2019 10:42 PM

I just wanted to circle back around. I went with this VFD https://amzn.to/2Un5fea – LAPOND New Series VFD Inverter VFD Drive 2.2KW 220V 3HP 9.6A,Variable Frequency Drive for Motor Speed Control (2.2KW)

When I get it in, installed, and running I’ll post back in here the experience.

-- My Attempt at Instagram: https://www.instagram.com/buddylindseyjr/

View MDemerse's profile

MDemerse

1 post in 486 days


#8 posted 07-29-2019 06:27 PM

It looks like the drive you’re looking at is comparable to the Fuji Mini, which is widely available used for a lot less, including here. I would certainly give that option a look before I bought anything.

-- MDemerse, North Carolina

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