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Unisaw Motor Replacement 5hp

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Forum topic by tightbonded posted 01-08-2016 03:14 PM 639 views 0 times favorited 7 replies Add to Favorites Watch
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tightbonded

2 posts in 335 days


01-08-2016 03:14 PM

Topic tags/keywords: tablesaw question

I bought a 3 PHASE 5 hp Delta Unisaw at an auction and I am biding on a 5 hp SINGLE phase motor on E Bay to swap out. I have little knowledge about this process. Are there any additional parts that I will need or things to know about the swap process? I have not done anything like this before.


7 replies so far

View MrUnix's profile

MrUnix

4230 posts in 1664 days


#1 posted 01-08-2016 04:58 PM

Get a VFD. Much cheaper (about $200) and will give you a lot more benefits you won’t get with a single phase motor. Soft start, electronic braking, variable speed, programmable overload protection, trivial emergency stop wiring, over-torquing, etc… Plus, 3-phase motors are much more efficient, more robust, and you won’t need the starter that is on the saw now, so you can sell it to recover some money.

It you do swap out the motor, you just need to make sure it’s got the proper mount… left tilt and right tilt motors are not interchangeable. You may also need to tweak the electrics a bit, such as replacing the heaters in the starter for the new motor.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View alittleoff's profile

alittleoff

296 posts in 741 days


#2 posted 01-08-2016 06:09 PM

Like Brad says, go with a VFD. Simple to hook up, and it works great. I bought my 3hp for 200.00. I really like the soft start and ability to stop the blade. I set mine where it stops after about 3 turns. Got lots of options.
Gerald

View rick1955's profile

rick1955

258 posts in 896 days


#3 posted 01-08-2016 07:27 PM

5 hp vfd is $339
http://www.factorymation.com/Products/7300CV_230V/

-- Working smarter with less tools is a true crafts person...

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MrUnix

4230 posts in 1664 days


#4 posted 01-08-2016 07:42 PM

5 hp vfd is $339
http://www.factorymation.com/Products/7300CV_230V/

- rick1955

That VFD is 3-phase input, so it’s not really that useful if all you have is single phase 240v :)

Also, don’t buy based on claimed HP, it’s just a marketing gimmick. Use the FLA of the motor. A 5HP 3-phase motor can easily be run on an FM50-203-c, which is rated at 10.5A, since the motor will rarely, if ever, see FLA… and even if it does occasionally, the VFD is rated for up to 150% duty for short periods. The worse that will happen should you find a way to push it too hard is it will go into OL mode and you need to push the reset button to continue on.

Check the OWWM and PracticalMachinest sites for lots and lots of example of using that “3HP” VFD on 5hp motors, such as this thread about one running a 5hp Delta 12/14 and doing some serious work without problems. The FM50 can be had for slightly less than $200 before shipping.

Cheers,
Brad

PS: A perfect example of the HP claim: My 3HP baldor is rated at 7.4A FLA… the “2HP” FM50 can handle up to 7.5A, so the “3HP” model would be way more than needed – you would not only be paying more than you need to for the larger unit, but you would also have to lower it’s output rating to provide proper overload protection.

-- Brad in FL - To be old and wise, you must first be young and stupid

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alittleoff

296 posts in 741 days


#5 posted 01-08-2016 10:06 PM

I checked the amps on my saw, coming off the vfd. 3.4 amps is the most it’s pulled so for. I looked at the amp rating and was thinking the same thing. The teco fm 50 would easily carry a five hp motor especially if you have 240 volts at your house and not getting low voltage. The vfd allows you to set it up for the actual voltage your running on also.
Gerald

View MrUnix's profile

MrUnix

4230 posts in 1664 days


#6 posted 01-08-2016 10:17 PM

The vfd allows you to set it up for the actual voltage your running on also.

Huh? Current (for overload protection), yes… but voltage? Not the FM50 AFAIK.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View tightbonded's profile

tightbonded

2 posts in 335 days


#7 posted 01-10-2016 02:27 PM

Brad,

Thank you for all the great information, I see I was just out bid on e Bay for the motor so, I am going to switch and buy the VFD like you recomended.

Mike

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