VFD for kmg

Josh Rider

Josh Rider

Stuff maker
Joined
Sep 2, 2014
Messages
2,428
I read The Count's info on vfds and motors and some older threads, I just want to make sure I do this right since I'm slowly converting my kmg
Right now I'm running my kmg with step pulleys and a 1 HP single phase motor.
I'm going to start converting it to variable speed.

A buddy of mine has already installed 220 to an outlet near my current motor so it was more efficient. (made an unbelievable difference)
So since I already have 220, I believe a 2 HP motor would be ok to go with.

The VFD I want to get is the KBAC-27D.
http://www.electricmotorwholesale.com/9520-KBAC-27D/
From reading, I want the on/off switch
and I'm assuming the forward stop reverse switch if I'm going to also use this vfd for a disc grinder that
will be used when the kmg is not in use.

What about the liquid tight fittings? Is this to seal it from the grinding dust or is this for if I wanted to spray it down for some reason?

I'll buy the motor later as this is all I can afford right now.

Does this all look correct?
Is this the most inexpensive route for this particular VFD?
Will I no longer need the step pulleys?

Thanks so much for any help.
 
greenjebadiah said:
I read The Count's info on vfds and motors and some older threads, I just want to make sure I do this right since I'm slowly converting my kmg
Right now I'm running my kmg with step pulleys and a 1 HP single phase motor.
I'm going to start converting it to variable speed.

A buddy of mine has already installed 220 to an outlet near my current motor so it was more efficient. (made an unbelievable difference)
So since I already have 220, I believe a 2 HP motor would be ok to go with.

The VFD I want to get is the KBAC-27D.
http://www.electricmotorwholesale.com/9520-KBAC-27D/
From reading, I want the on/off switch
and I'm assuming the forward stop reverse switch if I'm going to also use this vfd for a disc grinder that
will be used when the kmg is not in use.

What about the liquid tight fittings? Is this to seal it from the grinding dust or is this for if I wanted to spray it down for some reason?

I'll buy the motor later as this is all I can afford right now.

Does this all look correct?
Is this the most inexpensive route for this particular VFD?
Will I no longer need the step pulleys?

Thanks so much for any help.
Click to expand...


The holes in the VFD box are 1/2 standard pipe thread sizes

You do need the fittings, but I can't see the prices on that site
The cart total goes up by 80$ when you include two switches.
I say that's too much, they should be Twenty each max, BUT you can't easily find 2 HP rated switches locally.


I say buy them in person at a local home depot or such .
Cable Glands
http://www.amazon.com/Morris-22552-Cable-Thread-0-551/dp/B005GDFKHE
make sure the interior hole can fit the wire
 
The one key point you are not touching on is the Motor....The VFD is to convert Single Phase current to 3 phase current so you will need a 3 phase motor and the price is usually less than a single phase for the same HP rating. You don't really need the step pulleys with the VFD however that is another cost item for 2 new pulleys.
 
Busto said:
The one key point you are not touching on is the Motor....The VFD is to convert Single Phase current to 3 phase current so you will need a 3 phase motor and the price is usually less than a single phase for the same HP rating. You don't really need the step pulleys with the VFD however that is another cost item for 2 new pulleys.
Click to expand...

greenjebadiah said:
I read The Count's info on vfds and motors and some older threads, I just want to make sure I do this right since I'm slowly converting my kmg
Right now I'm running my kmg with step pulleys and a 1 HP single phase motor.
I'm going to start converting it to variable speed.

A buddy of mine has already installed 220 to an outlet near my current motor so it was more efficient. (made an unbelievable difference)
So since I already have 220, I believe a 2 HP motor would be ok to go with.

The VFD I want to get is the KBAC-27D.
http://www.electricmotorwholesale.com/9520-KBAC-27D/
From reading, I want the on/off switch
and I'm assuming the forward stop reverse switch if I'm going to also use this vfd for a disc grinder that
will be used when the kmg is not in use.

What about the liquid tight fittings? Is this to seal it from the grinding dust or is this for if I wanted to spray it down for some reason?

I'll buy the motor later as this is all I can afford right now.

Does this all look correct?
Is this the most inexpensive route for this particular VFD?
Will I no longer need the step pulleys?

Thanks so much for any help.
Click to expand...
i think he's got it
 
I saw that but was not sure if he was talking about 3 phase or single phase? just a heads up on 3 phase...
 
I appreciate the replies.
Yes I realize my single phase motor won't be used and that I'll need a three phase. I was going to sell the motor and pulleys to put towards the new 3 phase motor(s).

Thanks for the link on the glands Count and all of the info in the stickies.
I haven't decided on a specific brand of motor yet other than the 56 frame tefc.
I would think I could use the existing pulleys but keep the belt on the middle pulley since it is a 1:1 ratio.
Or is that incorrect...
 
Last edited:
I just picked up a KBAC-24D from the same supplier and sprang for the OEM switches (AC Line and reversing) from them. The switches came installed along with the rubber switch boots which maintain the water tight seal with the case. You do not want water or metal dust to infiltrate the switch. -Doug
 
DougSeward said:
I just picked up a KBAC-24D from the same supplier and sprang for the OEM switches (AC Line and reversing) from them. The switches came installed along with the rubber switch boots which maintain the water tight seal with the case. You do not want water or metal dust to infiltrate the switch. -Doug
Click to expand...

Good point.
 
greenjebadiah said:
I appreciate the replies.
Yes I realize my single phase motor won't be used and that I'll need a three phase. I was going to sell the motor and pulleys to put towards the new 3 phase motor(s).

Thanks for the link on the glands Count and all of the info in the stickies.
I haven't decided on a specific brand of motor yet other than the 56 frame tefc.
I would think I could use the existing pulleys but keep the belt on the middle pulley since it is a 1:1 ratio.
Or is that incorrect...
Click to expand...

You will likely have a 1750 rpm motor. 1:1 pulley ratio might be a bit slow when running all out. You could do the 2x jumper. There are all kinds of opinions on getting increased speed this way. Read all the past threads on kmg and you will have a good understanding of pros and cons of this. Or just get the sheave ratio right from the start.
 
Ok. I did read about the 1750 motor with 4 poles keeping the HP up to 2HP as the speed increased. Seemed like the way to go. I can't say I understand it, but guys on here seem to like it. I will def. be reading more.
 
Good info from the guys above... I know you are gonna buy the motor later, but I did want to throw this out there... You can get a 3ph 2hp 3600 rpm tefc motor from automation direct for $127...I'm running the 1.5hp version on my disc sander and it's working great! 2 yr warranty you. The 2hp version is model # MTR-002-3BD36. Figured you would want to know for future reference 😊
 
razor-edge-knives said:
Good info from the guys above... I know you are gonna buy the motor later, but I did want to throw this out there... You can get a 3ph 2hp 3600 rpm tefc motor from automation direct for $127...I'm running the 1.5hp version on my disc sander and it's working great! 2 yr warranty you. The 2hp version is model # MTR-002-3BD36. Figured you would want to know for future reference 😊
Click to expand...

That's awesome. Very inexpensive for a new motor.
Thanks for the info. Are you using the kbac 27d on your disc grinder?
 
PT Doc said:
You will likely have a 1750 rpm motor. 1:1 pulley ratio might be a bit slow when running all out. You could do the 2x jumper. There are all kinds of opinions on getting increased speed this way. Read all the past threads on kmg and you will have a good understanding of pros and cons of this. Or just get the sheave ratio right from the start.
Click to expand...
what is this 2 x jumper you are referring to. im runnin a 1750 2 horse with 6 in drive wheel and would like more speed without changing motors
 
tuskbuster said:
what is this 2 x jumper you are referring to. im runnin a 1750 2 horse with 6 in drive wheel and would like more speed without changing motors
Click to expand...

The 27D can be run at double speed. I have a 1750 motor with the 27D doubling, and it works great. It is one of the internal switches.

To the OP, if you are going to run more than one motor off the same VFD, the motors will need to be the same hp rating.
 
Why You want to use Scalar type VFD instead of Vector type?

(Using LG SV015iC5 on my grinder, but I put this in hermetic metal cabinet to protect him form dust etc)

J. Hoffman said:
To the OP, if you are going to run more than one motor off the same VFD, the motors will need to be the same hp rating.
Click to expand...

Not just only HP, the Engines must be exactly the same model.
 
J. Hoffman said:
The 27D can be run at double speed. I have a 1750 motor with the 27D doubling, and it works great. It is one of the internal switches.

To the OP, if you are going to run more than one motor off the same VFD, the motors will need to be the same hp rating.
Click to expand...

Thanks, I was wondering about that. Seems like a 2HP disc grinder is overkill.
 
You must log in or register to reply here.
Back
Top