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newbie vfd wiring help

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Forum topic by megabork posted 11-02-2018 03:55 PM 796 views 0 times favorited 19 replies Add to Favorites Watch
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megabork

14 posts in 261 days


11-02-2018 03:55 PM

So i recently purchased a pm72 table saw and it has a 3 phase motor and after a million hours of research ive decided to use a vfd..the problem there seems to be alot of ways to put a on off switch and im a bit confused/I will be powering it with a cable to the dryer plug which we dont use as we have gas so i dont have to pay for new breakers etc etc..any way i love this site been lurking for a while alot of smart guys in here tia ..finn


19 replies so far

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MrUnix

7407 posts in 2620 days


#1 posted 11-02-2018 05:10 PM

It would help if we knew what VFD you have and what kind of switch you plan on using.

Cheers,
Brad

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

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megabork

14 posts in 261 days


#2 posted 11-02-2018 05:42 PM

i was looking at this and i was hoping to get steered in the right direction on the switch as well

https://www.amazon.com/gp/product/B01M7PR9BJ/ref=ox_sc_saved_title_1?smid=A2RB21RUGRFV4T&psc=1

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MrUnix

7407 posts in 2620 days


#3 posted 11-02-2018 06:30 PM

That appears to be one of those Huanyang asian imports… based on reviews, it’s hit or miss with them, so you take your chances. And you can run the VFD from it’s control panel directly without the need to do anything else. If you want an external switch, wiring will either be a 2 wire or 3 wire deal depending on the switch(s)... simplest method is just a single pole on/off switch wired between FWD and DCM (12v). If you have the original control station for your PM, which would have been a momentary switch (NO start/NC stop), then you would need three wires. For either method, you will need to program the VFD to use external switches instead of the VFD control pad (PD001=1 – check the manual to be sure).

Cheers,
Brad

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

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megabork

14 posts in 261 days


#4 posted 11-02-2018 06:37 PM

whoa turbo hahaha alot of thats way over my head .. so power into vfd then to motor then to machine on off or does it need to go to a new switch ? clearly im going to need to get someone over to do this now..i just want to understand how it its layed out to tell my guy… also guy with machine has a baldor vfd but its twice the amount of money

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MrUnix

7407 posts in 2620 days


#5 posted 11-02-2018 06:42 PM

Here is a typical wiring diagram for three wire control and a TECO (Westinghouse) FM50 VFD:

Wiring is super simple, and other VFD’s, like the TECO L510 are even simpler. For two wire control (single switch), just run a switch between Fwd (3) and 12v (5). Program settings will be dependent upon which VFD you get.

Also, what is the FLA of your motor?

Cheers,
Brad

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

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megabork

14 posts in 261 days


#6 posted 11-02-2018 07:12 PM

so the saw on off is operated by turning the vfd on and off? im sorry but electrical stuff isnt my thing.. i haven’t picked up saw but i cant find a reference to a “fla” number on the pics of motor

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mathguy1981

94 posts in 325 days


#7 posted 11-02-2018 07:37 PM

FLA = Full Load Amps, or amperage rating under a heavy load. Is this the 5-hp or 7.5-hp model? Either way that’s 900lbs of steel and a 1” arbor with 12-14” blades…dang. This might help:
http://lumberjocks.com/topics/56481

Get a hold of a users manual so you can know what the recommended breaker amperage is…if you dryer curcuit is too high/low, you can always change the breaker for the proper size for the VFD and the saw.

-- Two thumbs and counting

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megabork

14 posts in 261 days


#8 posted 11-02-2018 07:38 PM

i wonder if this is just a bolt on ? it might be alot easier ugh i have seen a hundred threads on this im sorry to bug people

https://electricmotorwarehouse.com/5-hp-3450-rpm-145t-230v-air-compressor-motor-leeson-120554/

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megabork

14 posts in 261 days


#9 posted 11-02-2018 07:56 PM

hahaha i read that whole thing twice and another one you were on from 2015..hay hay its the 5hp version baldor

this looks like the one?
https://www.mmtoolparts.com/store/powermatic-66-table-saw-motor-6472335

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MrUnix

7407 posts in 2620 days


#10 posted 11-02-2018 09:03 PM

i wonder if this is just a bolt on ? it might be alot easier ugh i have seen a hundred threads on this im sorry to bug people
- megabork

You can swap out the motor with a single phase one, but you will wind up doing more work, and spending twice as much, for an inferior solution. A VFD is dirt simple to use and you will get benefits from that combo that you could never get from a single phase solution. By far, the hardest part of using a VFD is figuring out where to mount it :) YMMV.

Cheers,
Brad

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

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megabork

14 posts in 261 days


#11 posted 11-02-2018 09:58 PM

oh yeah i forgot about changing out switches ,heaters? i guess thats why i listened to you in the first place on the vfd.. ok well im picking the beast up on sun and im going to thru it so there’s time..thank you very much for your time and expertise

View ErikF's profile

ErikF

647 posts in 2664 days


#12 posted 11-03-2018 11:41 AM

I use a few VFD’s in my shop, all are the Chinese models. I have run them for a few years without any issue. For the on/off switch, I use the button on the face of the unit.

There is a little bit of a learning curve getting them setup for the first time but they come with a manual.

If you’re planning to purchase more 3phase equipment, I’d think about a rotary phase converter. Simple setup and you can run the output as if it were a true 3phase line.

-- Power to the people.

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megabork

14 posts in 261 days


#13 posted 11-03-2018 03:06 PM

thats good to hear .. so power to vfd then to motor ? and operate on off of machine with button on vfd? im assuming you mounted vfd on the machine ? thanks

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01ntrain

259 posts in 1491 days


#14 posted 11-03-2018 04:35 PM

Got any electrician buddies? If so, pay them….

WODR, you sound dangerously inept at going anywhere near electricity. This is not really a DIY job, unless you already kinda know what you’re doing with machine wiring. This is not really plug and play. Do yourself and us a favor and pay someone to do this job for you…..

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shampeon

1900 posts in 2604 days


#15 posted 11-03-2018 05:20 PM

Just popping in to say you can’t run a compressor duty motor on a table saw. And you bought a piece of serious equipment, and it needs to be treated as such. Get a VFD and get someone to wire it in, then use the hell out of it.


i wonder if this is just a bolt on ? it might be alot easier ugh i have seen a hundred threads on this im sorry to bug people
https://electricmotorwarehouse.com/5-hp-3450-rpm-145t-230v-air-compressor-motor-leeson-120554/

-- ian | "You can't stop what's coming. It ain't all waiting on you. That's vanity."

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