Vfd

Henry Cambron

Henry Cambron

www.worldclassknives.com
Joined
Nov 30, 2006
Messages
218
First, I know nothing about AC drives, Phase Converters, VFD's, etc. I saw an add for a Teco EV VFD in a magazine. (www.tecowestinghouse.com) I checked with the company but it only works on 3 phase motors. Does anyone know of a VFD that will work on my motor. I have a WEG A.C. single phase 2 h.p. motor, 220 volt., 60 hz, continuous duty, model # 00236es1bf56h.
 
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As far as I know VFD's only work on 3 phase motors, you would need a new motor to use a VFD.
 
Does the VFD then convert single into three phase ??? I got the set up from Rob at KMG and then just took it to a local motor shop, and they wired it up for $50.00. I know the power going into the VFD is single phase 240.
 
m. wohlwend said:
Does the VFD then convert single into three phase ??? I got the set up from Rob at KMG and then just took it to a local motor shop, and they wired it up for $50.00. I know the power going into the VFD is single phase 240.
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Pretty sure it is a DC motor if it came from Rob
 
No.. said AC on it. I was expecting a DC, but I am positive it says AC on it. It's the 2hp motor.
 
I'm not sure about yours, but my vfd has a plate that states input voltage. It's a kb brand and can run it 110 or 220 volt.
 
m. wohlwend said:
Does the VFD then convert single into three phase ??? I got the set up from Rob at KMG and then just took it to a local motor shop, and they wired it up for $50.00. I know the power going into the VFD is single phase 240.
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I misread the post. Yes it converts single phase to three phase.
 
Mike Quesenberry said:
I misread the post. Yes it converts single phase to three phase.
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It does ?? WOW that explains why the guy who hooked it up was so impressed with the drive. He kept telling me over and over what a great unit I had purchased. He also said Rob's prices were good. I am really pleased with my KMG and the service I received from Rob.
 
The vfd is relatively simple to wire to a motor. Follow the diagram and take your time and save 50 bucks. If you have any questions you know where to go.
 
Yeah, I was probably lazy on this one, had money to cover it, so just took it down there and he was done. I think we derailed this thread from the poor guy who origianlly posted about his motor.
 
OK, guys, wck is at sea with this and you are giving him a lot of extraneous info. He needs help.

For most purposes, a VFD converts 1 phase power to 3 phase. It then allows that power to be regulated for speed control and other things. This is very useful for a grinder. You need a three phase motor to use the VFD. The motor HP must be equal to or less than the VFD rating, and match the output voltage of the VFD.The output of some VFD's can be selected to run different voltages, but for most knife making purposes, you are looking for a 208/240 output. So, the input power is 208/240VAC single phase ( a standard 220VAC 3 prong plug), and the output is 208/240 VAC 3 phase ( usually four wires ,hardwired to the motor). There may be some other connections for a speed control dial,remote on/off switch, reversing switches, etc. ,but most VFD's will run all their functions from the box without these. Read the manual that comes with the unit. The info in the manual may look scary, but 90% of all those tables and charts are of no need for our purposes. All we need the VFD to do is turn on and off....and go faster and slower. The default settings on all the other things is usually fine.

Again:
The VFD and motor need to be matched in HP rating and both have the same power ( motor = 208/240VAC, 3PH ; VFD = 208/240VAC 1PH input , 208/240 VAC 3PH output)

Connect the "LINE IN" 220 1PH to the input on the VFD ( two hot wires and a ground), and the "OUTPUT"to the motor (three hot wires and a ground).

Stacy
 
Not all VFD's need 208/240 VAC Single Phase inputs. My KBAC-27 is running off of 110VAC Single Phase Input and has a 208/240 VAC 3 phase output to the motor. The only limitation was that I had to use a 1.5HP motor. To use a 2HP or above the KBAC-27 needs a 208/240 VAC single phase input.

I don't think a VFD will work on a single phase motor? You may need to get a three pulley system to change speeds with that motor...Or get a 3 phase motor...
 
For 220 (non-3 phase) you just need a speed control.

KB makes great DC motor controllers and they are readily available used like THIS ONE.

You stated your motor was AC so you need something LIKE THIS.
 
I had a 3 speed pulley set up on a 2 Hp WEG single phase 110 volt. It drove my Coote very well, which made me want the 2hp VFD motor on the KMG. If your motor won't work with a VFD, then try a 3 speed pulley set-up. I made alot of knives with that set up. The VFD is very nice to have, so if you could afford one I would go that route.
 
Since he was asking about 220V, 2HP, and VFD's that is what I answered him on.
No point in giving your favorite cherry cobbler recipe when the person asked about how to bake an apple pie.

Stacy
 
bladsmth said:
Since he was asking about 220V, 2HP, and VFD's that is what I answered him on.
No point in giving your favorite cherry cobbler recipe when the person asked about how to bake an apple pie.

Stacy
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Stacy, I don't know if you meant this for me but I figure if a guy asks me which hammer he should use to drive a screw in I would tell him to get a screw driver ;)

The primary question I took from the OP is: "Does anyone know of a VFD that will work on my motor"

The speed controls I linked to would work with his current setup and do the same thing as a vfd sans the remote capabilities. This is generally not a problem because speed controls are not as environmentally sensitive as a VFD.

FWIW - Based on the pictures at Beaumont's site, he is using speed controls not VFD's. I bought my KMG without a motor or control so I don't have first hand knowledge of that.
 
Looks like a speed control will do what I what I want. I just want to slow this thing down from the 3500 - 3600 rpm's that it's running.

I have Rob's step pully on both the grinder and motor. It's just a hassle to get up under my table to loosen the bolts and slide the motor in or out.

Thanks for the info guys
 
cpirtle said:
Stacy, I don't know if you meant this for me but I figure if a guy asks me which hammer he should use to drive a screw in I would tell him to get a screw driver ;)

The primary question I took from the OP is: "Does anyone know of a VFD that will work on my motor"

The speed controls I linked to would work with his current setup and do the same thing as a vfd sans the remote capabilities. This is generally not a problem because speed controls are not as environmentally sensitive as a VFD.

FWIW - Based on the pictures at Beaumont's site, he is using speed controls not VFD's. I bought my KMG without a motor or control so I don't have first hand knowledge of that.
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Rob use's VFD's not speed controllers, and the link you gave to the AC speed controller will not work on the OP's motor.That speed controller is for fans and blowers, totally different kind of motor.Dave
 
wck said:
Looks like a speed control will do what I what I want. I just want to slow this thing down from the 3500 - 3600 rpm's that it's running.

I have Rob's step pully on both the grinder and motor. It's just a hassle to get up under my table to loosen the bolts and slide the motor in or out.

Thanks for the info guys
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Yeah that is REALLY fast. Most grinders should have a 1750rmp motor mated to them. You can make a plate on a hinge and attach the motor to that and the weight of the motor will keep tension on the belt. Pick the motor up and you can quick change the belt. Then you don't have to crawl under the table and mess with bolts. I had this set up for over a year. Now I have the KMG with Rob's VFD and 240 volt 2 hp motor. It is not plug and play, so either be ready to hook it up yourself, or have someone capable of doing so. Good Luck! :thumbup:
 
If you can't foot the bill for a VFD conversion (new motor and a VFD for it) I do not recommend using a speed control on a 1PH AC motor. They are designed to run at full nameplate voltage. They lose torque fast and it is very hard on the motor to run it slower than full speed.

Grab some pulleys if you really want it slowed down add another set of pulleys with a 2:1 or 1.5:1 ratio. Then use your step pulleys.
 
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