@Susquatch It is my understanding that you need some kind of disconnect after the plug. a 3HP rated switch would do the trick, and be fully code compliant.
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Lathe VFD?
- Thread starter Susquatch
- Start date
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Just to make sure we are on the same page....
220V Single phase outlet on Wall.
Single phase lathe wiring plugged into it.
Then a 3HP disconnect either at the plug or on the lathe.
From there to the fuses, and on to the VFD.
A thumbs up will do... LOL!
slow-poke
Ultra Member
Fuses sound like a good idea, but are they required by code?
Seem redundant, that's what the breaker is for?
I agree totally. Just me doing something easy that is bullet proof. Can't help myself.
I don't know if this will help. Here's the inside of my lathe control box. I have 220VAC single phase in. Output from VFD is 3 phase to the 1HP lathe motor. Schematic attached too.
Tom O
Ultra Member
I just came across this and thought someone might be interested.
I'll prolly have the buss bars, and the VFD but no relays or transformers.
I don't have a coolant pump or an ELS nor do I want them. Under normal circumstances, I'd love to run my lamp the way your is done, but I have learned to totally completely HATE the factory 24V lamp. It burns out if I burp.
So I want to replace it with a 120 or better yet 240V AC LED lamp. Maybe two 120s in series so they can be run off of the 240 input. That is project 42k.
I found a Grizzly schematic for a 240 3phase lathe that I used to get going a month or so ago, but quickly realized I was better off starting from scratch.
I am currently busy roughing out my constraints and operational requirements. Then I'll do a rough schematic, and then start sourcing parts - which will dictate some changes. The wiring itself should be relatively easy after that.
Thanks ever so much for thinking about me and reaching out to help.
It was only a matter of time. This little gem has some interesting features. Not the least of which is Ethernet support.
Basically, it converts single phase 120 to 3phase 240 but it is limited to 1HP motors.
After much painful thought, I've decided to throw in the towel on front mounting the VFD. I'll temporarily mount it on the front while I set it up and then move it to the back outside of the control box where it's hard to get at. There just isn't a place up front where I can put it permanently and I'm not buying another VFD just for the removable control keypad. I'll add a simple swarf shield out back to keep it from ingesting swarf, accept having to crawl behind my lathe to re-program the VFD when I need to, and get on with this project.
I'm reminded of what a CEO of my previous employer said to me once. "There comes a time in every project when it is time to shoot all the engineers and get on with building the product." He was right, but I think a little too aggressive and we paid dearly for that at times.
Anyway, I've procrastinated a decision on this project for way too long and I need to get on with the VFD 3phase motor conversion.
I'm reminded of what a CEO of my previous employer said to me once. "There comes a time in every project when it is time to shoot all the engineers and get on with building the product." He was right, but I think a little too aggressive and we paid dearly for that at times.
Anyway, I've procrastinated a decision on this project for way too long and I need to get on with the VFD 3phase motor conversion.
Oooh...like the Cone of Silence in Get Smart!! I love that idea!
I like it too. But my ceiling is 20 ft high......
You guys are gunna mess me all up. I've accepted defeat and am ready to move on and you are trying to make me fight some more. I need to get that lathe purring like a hot cat before I die!
That's worth considering!
Project is back on hold while I assess that idea.
I had planned to put the DRO on a swing arm, so why not the VFD too?
I'll have to look at the electrical code again though. Something tells me that this might be outside the envelope.....
Ironman
Ultra Member
Once you get it done, and are loving it, you may consider a remote on/off and speed control pot mounted someplace handy.
It really is easy to do. The electric braking is a great adjustment to make in the initial setup too.
After your disconnect on the machine, the CEC no longer applies - from a code compliance point of view. After all, you have modified the wiring which makes it no longer CSA approved anyway.
However, if you do this, then use a flexible steel conduit, and STRANDED of the appropriate gauge in the wires to/from the box that can move.
That was always the plan.
It's things like fine tuning braking, motor parameters, and frequency, etc that I am trying to make convenient. These are things that are programmed into the VFD. ALL the other stuff will be hard wired to a control panel facing the operator on the headstock.
My bitch was (and still is) convenient comfortable access to the VFD itself for programming. If only my TECO had a removable control panel. It doesn't. That means crawling around in behind my lathe. Not easy at my age. 15 years ago as a young agile boy of 62, it would have been a piece of cake.
Don't you think that's well worth the cost, considering how much time you've spent trying to find other less than perfect alternatives.
Thanks. I expect that you are correct in all respects.
I was back there earlier this afternoon. I'm not doing the arm thing. Stranded wire for flexibility is the least of the issues. Instead I'm going to mount it on a combined cover bracket on the left side of the existing electrical control box. That allows for a short wire bundle that runs into the box for access to controls, and a very short direct drop to the 3-ph motor.
It looks great facing to the left, but I can't get far enough away from it to read it even with readers on! So it has to face the back wall where there is another foot of space and perhaps even room for a stool. I'll have to see what I have for 6" angle aluminium but buying a piece isn't unreasonable.
It's also possible that I could mount it on the gear box hat I have planned to accommodate the DRO. I'm, going to rough something together out of plywood later this coming week to see if I can kill two birds with the same stone.