VFD on pot!

[DSEL74]

Would this be suitable to use on a vfd for a speed control dial??
AC 220V Mechanical Gear Motor Speed Controller DC 51 | eBay (http://www.ebay.com.au/itm/AC-220V-Mechanical-Gear-Motor-Speed-Controller-DC-51/301312903321?_trksid=p5411.c100168.m2941&_trkparms=aid%3D333008%26algo%3DRIC.MBE%26ao%3D1%26asc%3D20140131123801%26meid%3Df12e08cd65d04b178cd7f2ad708eb5b3%26pid%3D100168%26rk%3D3%26rkt%3D15%26mehot%3Dpp%26sd%3D121224015434)




Also is there any issue with using a higher rated vfd on a much smaller motor? i.e 2hp Vfd on a ½hp motor? is there a safe ratio or max ratio?

[Stustoys]

Would this be suitable to use on a vfd for a speed control dial??
No, thats a DC motor controller.
I assume you're talking about a Huanyang?You just need a 10Kohm pot, pretty sure linear(though I think they have a new model out that uses 5k ohm, maybe it was a typo lol)

http://www.ebay.com.au/itm/10Pcs-B10K-3-pin-Liner-Taper-Rotary-Potentiometer-Pots-Shaft-10K-ohm-16mm-New-/181527345566?hash=item2a43df799e

If you want the pot in the vsd you'll need a different pot, Ray did a thread on them I'll see if I can find it.

You can also get 10 turn pots if you feel the need. The ones I have have clock like hands in the front to tell you what they are set on but I cant find any.
http://www.ebay.com.au/itm/3590S-2-104L-10K-Ohm-10-Turn-Rotary-Wire-Wound-Precision-Potentiometer-Pot-/321765082221?hash=item4aeab1846d


Also is there any issue with using a higher rated vfd on a much smaller motor? i.e 2hp Vfd on a ½hp motor?
No. Though you should set the VSD current accordingly.

Stuart

**Rays thread
http://metalworkforums.com/threads/147356-Huanyang-VFD-front-panel-pot

[BobL]

Would this be suitable to use on a vfd for a speed control dial??
At that price I'd say that is "light dimmer" type control unit so it is not suitable for a VFD

For an external pot just go to Jaycar or Altronics. I think I paid $3 for the switch and $2 for the pot - the plastic housings/boxes range from a few $ up to ~$10


Also is there any issue with using a higher rated vfd on a much smaller motor? i.e 2hp Vfd on a ½hp motor? is there a safe ratio or max ratio?
Provided the VFD has a current limiting feature it should be OK.
A 2HP VFD can deliver more than 7A whereas a 1/2HP (375 W) motor should draw no more than 1.5A but if you were to set the current limit to 2 or 2.5AA that should be OK

I have 2, 1.5, three 1, and two 0.5 HP motors all set up on 2HP VFDs.
The 3HP WW BS motor uses a 4HP VFD.

[BobL]

No, thats a DC motor controller.
I assume you're talking about a Huanyang?You just need a 10Kohm pot, pretty sure linear(though I think they have a new model out that uses 5k ohm, maybe it was a typo lol)

Are you referring to the ASKPOWER units?
I'm setting up one of these at the moment and it uses a 5k pot.
Out of the box it is set up for 400Hz max frequency so what out
It also has a quirk in that the accel and decel times are relative to 400 Hz.
So if you set the accel time for 10 sec and max frequency for 50 it gets to speed in 50/400 x 10 or about a second!
It also has a reduced parameter list compared to the standard HY units.

[Stustoys]

Are you referring to the ASKPOWER units?

Cant say, I think I came across them on ebay a month or so back.
They just looked like an "updated" Huanyang



Out of the box it is set up for 400Hz max frequency so what out

All my Huanyangs arrived like that(including base freq) so when I first tested them they were a little gutless to say the least.


It also has a quirk in that the accel and decel times are relative to 400 Hz.
So if you set the accel time for 10 sec and max frequency for 50 it gets to speed in 50/400 x 10 or about a second!

Wow, now that would have me scratching my head for a long time. Thanks for the heads up.

Stuart

[BobL]

Cant say, I think I came across them on ebay a month or so back.
They just looked like an "updated" Huanyang
If anything they are a bare bones HY


All my Huanyangs arrived like that(including base freq) so when I first tested them they were a little gutless to say the least.
2 of my 8 HYs came like that - all the others were 50Hz


Wow, now that would have me scratching my head for a long time. Thanks for the heads up.
Stuart

I'll post any other stuff if I come across anything.

[DSEL74]

Stu, still need to fit one to that uncased unit..

Why don't all the VFD units just come with them fitted??
Thinking of getting this one next time. http://www.ebay.com.au/itm/1500W-2Hp-240V-7A-Single-Three-phase-Variable-Frequency-Drive-Inverter-VFD-/351501847124?fromMakeTrack=true

Any other recommendations?

[BobL]

Stu, still need to fit one to that uncased unit..
Why don't all the VFD units just come with them fitted??

Because many (or maybe most) are buried inside a machine or building with little or no local access.
Some don't even have a front panel - just a box you are expected to communicate with remotely.

[Stustoys]

Stu, still need to fit one to that uncased unit..

pretty sure they are 10kohm(and I guess Bob would have said if they arent).. though I'm not 100% all of them can be controlled by pot..though it wont cost you much to find out.



Thinking of getting this one next time. http://www.ebay.com.au/itm/1500W-2Hp-240V-7A-Single-Three-phase-Variable-Frequency-Drive-Inverter-VFD-/351501847124?fromMakeTrack=true

Any other recommendations?
I tend to just find the lowest price. As they dont all come from the same factory there is no way for us to know which factory they do come from. In fact I bought 4 in one go from the same supplier, two have whats needed for the external brake resistor, two dont. So even from the same supplier it looks like they come any-which-way lol

As far as size go it depends. If they arent going inside the machine I tend to just use 2.2kW VSDs so I can swap them around if one blows up(as yet that's not happened) and the price on the smaller Huanyang's hasn't been that much cheaper when I was looking. I have 4 of the uncased 1hp(?) ones for the Wickman and the HAUSER, which were cheap enough so that I didnt start thinking of silly ideas such as multi motors on one VSD or switching :wink:

Stuart

[DSEL74]

OK This is the motor of the scroll saw, I'm restoring, which can double as a die filer.

I can't remember how to convert it to take the VFD.

The saw dust can't be doing it any good so it got a going over with a soft brush and compressed air.
http://images.tapatalk-cdn.com/15/09/10/2b7d4727696ea2490a16c309a1d17b79.jpg

http://images.tapatalk-cdn.com/15/09/10/ebc9a1a6c79efaed4104697bf693dbc3.jpg

http://images.tapatalk-cdn.com/15/09/10/849e34ba9c749a0a4e06fcb6c6ca9b92.jpg



If I can get the pulley off I have a 1Ph motor the same but uglier that I can use in the meantime.

http://images.tapatalk-cdn.com/15/09/10/4a2697ade7407dceb634034590f05c18.jpg



http://images.tapatalk-cdn.com/15/09/10/0c95d3f6f1b168b86cfb52b6dab338d2.jpg





Seems the previous owner may have had trouble getting the pulley off in the past.

http://images.tapatalk-cdn.com/15/09/10/6b74b758b8f84072897ab4b37aa4f4a3.jpg

[Stustoys]

I can't remember how to convert it to take the VFD.

You'll need to get the star point brought out.

Stuart

[BobL]

That motor looks identical to the motor I did last week, 1/2HP 1440 RPM Cadet GMF.

Y point was buried under the area shown on the photo.
The bindings have to be cut away and a hot air gun on low to soften the varnish and gently gently tug out the connections till you find the Y point.

http://metalworkforums.com/attachment.php?attachmentid=358330&stc=1

[DSEL74]

That motor looks identical to the motor I did last week, 1/2HP 1440 RPM Cadet GMF.

Y point was buried under the area shown on the photo.
The bindings have to be cut away and a hot air gun on low to soften the varnish and gently gently tug out the connections till you find the Y point.

http://metalworkforums.com/attachment.php?attachmentid=358330&stc=1

½Hp GMF Cadet 1425 Rpm.

So I find the star point where three wires join as one, then bring them out separately and connect them to where to get the delta? I can't remember if the the existing external wires are involved or just the ones from the star get connected in a loop. It was about a year ago I watched someone do it.


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[KBs PensNmore]

VFD on pot!When I saw this, I thought wow someone's trying to power a VFD on pot, I've heard it's good, but didn't think it was THAT good.:doh:
Kryn

[DSEL74]

Well I do have a line shaft and I could maybe put a generator on it with a VFD and use coke, & pot to power the engine to run the line shaft???? But NO that's not where I was heading.