$50 2hp VFD - Whitby, On

[Dan Dubeau]

https://www.facebook.com/marketplace/item/589748386996897/?ref=product_details&referral_code=marketplace_general&referral_story_type=general&tracking={"qid":"-534290357378586159","mf_story_key":"6239696718006125507","top_level_post_id":"6239696718006125507","commerce_rank_obj":"{\"target_id\":6239696718006125507,\"target_type\":6,\"primary_position\":1,\"ranking_signature\":7353976604442009076,\"commerce_channel\":501,\"value\":0.00039425370587014,\"upsell_type\":129,\"candidate_retrieval_source_map\":{\"9163539070427876\":3004,\"9094740413974398\":3099,\"7547084158749412\":3003,\"9032128163572858\":3001,\"9155519491153729\":3012,\"9479214435422514\":3004},\"grouping_info\":null}","lightning_feed_qid":"-535428970147649106","lightning_feed_ranking_signature":"6359473682933408606"}

Check the specs above. This is not a 240v single phase input VFD, it's for 575 3~in/out. Or else I would have been posting about the new VFD I just scored lol.

I posted thinking this would be great for those that have a surface grinder running off a phase converter/transformer/native 600v. This is a perfect and cheap way for you to gain variable speed and softstart capabilities. Might be good for a lathe/mill too.

 

[Tom Kitta]

Part of the reason I did not get a mill in 380v range is b/c getting 1ph 440v to 3ph 440v VFD is difficult.

3ph to 3ph 440v class VFDs are common.

 

[Dan Dubeau]

I can see single phase high voltage input being a unicorn. Even High voltage 3-3 phase are difficult to find on the used market. Or maybe it's a perception thing and I just don't notice them. I know they're expensive though.

There certainly has to be a reason why this is not done, but if somebody could make a 240v 1ph - 575v 3ph VFD, with integral step up transformer they'd be a thousandair. When it comes to electronics I have a very simplistic view, of a very complex problem....Cmon smart people, make this thing......

 

[slow-poke]

I can see single phase high voltage input being a unicorn. Even High voltage 3-3 phase are difficult to find on the used market. Or maybe it's a perception thing and I just don't notice them. I know they're expensive though.

There certainly has to be a reason why this is not done, but if somebody could make a 240v 1ph - 575v 3ph VFD, with integral step up transformer they'd be a thousandair. When it comes to electronics I have a very simplistic view, of a very complex problem....Cmon smart people, make this thing......

It's simple to make a voltage doubler with just a couple of diode and capacitor so 120 to 240V is cheap and dirty. Not quite so simple for 240 to 575V, so now you need an actual high power DC-DC converter and that is not so cheap or simple. If you really need 600V fair number of surplus transformers floating about, but I would be more inclined to get a surplus 240V motor and sell the old one, that's what I did for my first mill.

This seems really cheap $107 and free shipping in Canada, no certification though.

VEVOR VFD 2.2KW 10A 3HP Variable Frequency Drive for 3-Phase Motor Speed Control | eBay

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[Dan Dubeau]

Ya, it's not a cheap problem to solve (1~ 240v -> 3~ 600v), which is, I'm assuming, why it hasn't been done in a neat little package before. I'm not an electrical guy when it comes to theory and circuits etc. I understand the nuts and bolts side of it, the practical side and dangers of it. House wiring, machine wiring, low voltage stuff etc, but am short knowledge when it comes to the why's and the theory of how it all works. I know it's a lot more complicated than I'm capable of understanding. I'm always in awe of you guys that DO understand how it all works, and can figure it out seemingly so easily. Society in general owes a big debt of gratitude to you smart people like that!

I'm with you, the easiest way to solve the problem is to repower to 240v. I acquired all the big components to build a 5hp rotary phase converter for 600v over the years (motor, transformer, enclosure, contactor, just need caps and a few odds and ends and to build it), but fell into a better deal for a VFD and mill motor so decided to go that route instead. No looking back now, I'm a VFD convert. Still might build that RPC someday, still undecided, but no urgent need for it anymore. I'll hang onto the 5hp motor though, in case I need it when I upgrade to a bigger lathe in the near future. I probably sell the other stuff though.