Wiring a VFD to a foot switch?

Hi all

Got a project here that needs a foot switch wiring to a single phase motor with a VFD. Usual cheap chinese one as below.

Is this possible?

https://www.ebay.co.uk/itm/393329744803?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=fX8V16uPTo2&sssrc=2349624&ssuid=Wi78z-7jSx-&var=&widget_ver=artemis&media=COPY

It will be a off/on/off switch. So put foot on switch then telease to stop the motor.

Thanks Faffer

Edited By wayne ollerenshaw on 12/01/2023 18:11:14

Cannot see a problem with that. It is no different than adding a remote pendant but just connecting the on off switch.

Only downside I can see is that I dont think reverse will be possible just using the foot switch.

regards

Hi Wayne

You will need to check in the electrical instructions to find if the start/stop paramaters provide 2 wire control for the simplest solution.

Emgee

VFD's are usually started by momentary off to on or on to off switches. The common switches usually have the choice when you wire them, you will need to see if the foot pedal works like that.

single phase motor and VFD ?

I missed that, Noel, maybe a sewing machine pedal would work, no need for a VFD.

Many, or probably most, VFD's can be set up or programmed to work with momentary or latching switches.

Ian P

Yes I have a motor I want to alter rpm/Hz.

I do have instructions somewhere from.another VFD I fitted just can't find themamd don't want to go buying another incase I can't run the motor from a VFD with a foot switch.

I was thinking on using a sewing machine pedal aswell

.my last sewing machine only had two wires going to it. It was an old Reeds.

I know the VFD can be set up for all sorts and dead.stoppong which I want aswell

.

Thanks for the help aswell

The point Noel was making is that some single phase motors have poor performance when run from a VFD, and many types of single phase motor simply won't work with a VFD. Ideally you need a shaded pole or permanent split capacitor motor.

Andrew

Edited By Andrew Johnston on 12/01/2023 22:22:11

Ideally, you need a three phase motor with the VFD if you want a usefully wide range of speed control.

Ian P

This is only a tester to see if what I am doing works so I can get a 3phase later if need be.

This is the motor I am using now though.

https://i.postimg.cc/MGbSsKmc/IMG-20221223-WA0000.jpg

https://i.postimg.cc/s2Rz9Z7d/20221223_113257.jpg

Ok just seen these forn the speed control. Which can

.I think be easy wired.to foot.control..

This will.do away with a VFD which is more complex

The motor is 0.55kw so under the 4kw speed.controer.

How does that sound

https://www.ebay.co.uk/itm/394417395091?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=v6hzlpy9s_a&sssrc=2349624&ssuid=Wi78z-7jSx-&var=&widget_ver=artemis&media=COPY

Edited By wayne ollerenshaw on 13/01/2023 13:38:10

Edited By wayne ollerenshaw on 13/01/2023 13:46:11

Sigh, the unit is a thyristor phase angle voltage controller. It does not change frequency so will not change the speed of an induction motor. As an aside note that the 4kW rating is for a resistive load, which a motor certainly isn't.

It would be much better to tell us what you want to achieve and then those forum members who understand the technology can advise on the best solution.

Andrew

Looking at the information in the advert for the VFD I can't decide if there are two different versions of the VFD or the same version can be used with either three phase or single phase motor. The picture with a singe phase motor seems to connect the main winding to one phase and the start winding to another phase. (I assume that the capacitor that is normally in series with the start winding is removed.) Can you post the manual for the VFD so we can see if any configuration settings need to be changed.

Les.

If it's to be of much help,I hope that any VFD manual that might be provided is written in better English than the tortured text of the eBay listing.

Edited By Clive Brown 1 on 13/01/2023 14:34:41

I thought you weren't supposed to have a switch between a vfd and the motor, but a single phase motor often has a centrifugal switch on the start winding. If you bypass that, it will might overheat, as not continuously rated

I'll stand to be corrected, as the later models might allow different facilities/programming.
I think you need an AT2 VFD, rather than an AT1, though some of the cheaper ones all use the same manual/datasheet and you need to extract the correct information yourself/

The way it used to be

AT-1 220v single phase in ~ 220v three phase out
AT-2 220v single phase in ~ 220v single phase out
AT-3 380v three phase in ~ 380v three phase out
AT-4 220v three phase in ~ 380v three phase out

For the AT-2 I think there are different wiring and programming parameters, depending on whether there is a start capacitor/switch remaining in circuit.

I do know someone who uses/used AT-2 on a single phase motor, but his demo is on a closed Facebook group for home made belt grinders.
He claims it's smooth from 20Hz-160Hz on a 4 pole motor, but said that torque dropped off at about 3750rpm.

Before people start shouting about over-speeding motors, he's checked for what speed they were originally balanced, and doesn't advocate going to 160Hz; this was just an experiment as he had the kit in stock and not a recommendation for others.

If you're buying new, or even second hand for a project, go for 3 phase to start with

Bill

Edited By peak4 on 13/01/2023 15:16:51

Whilst I knew there were some variable speed inverter type controllers available, I understood the concensus was that they had limited speed control and were of dubious value.

These AT2 inverters look to be an answer for some situations. Whilst I am perfectly happy to continue with VFDs with 3 phase output, curiosity got me looking for an online AT2 manual, but I've drawn a blank!

Just watched a youtube video of an AT2 being unboxed, but the box did not seem to contain any documentation.

Has anyone got an AT2 or a link to its user manual?

Ian P

All I want to do is use the motor I have to run at lower speeds than the 1440rpm it is. Maybe as low as 500rpm. Also be used with a foot control pedal.

If I can use a VFD, which one AT1 or AT2. Would be good to use the dead stop feature as I use on the o e on my lathe.

The project is to fit a thick wall tube inside an outer tube thay is fitted to the motor spindle to use a grinder to do the job to round off the edges.