Put me VFD and motor together

R

rashid11

Joined
Dec 8, 2005
Messages
707
As I await arrival of steel I ordered, I spent some time tonite wiring up VFD and motor.

The VFD is KB's KBAC-27D ($312) and motor is USEM (Emerson) 2HP 3600 inverter-duty 7/8 shaft ($178) 145TC TEFC frame.

VFD comes with start button and RPM resistor. I added additional "power on/off" and "direction" switches, following instructions @ KB Electronic's website.

Wired it for 220V, male plug. Output is L14 (4 wire, 3 phase + ground) female plug, so I can switch it between different motors, in the future. With a $6 pack of 1/4 flat connectors and sacrificial $1 extension cord I had, wiring took about 30mins.

I punched holes in the rubber "plugs" that came with VFD and ran cables through those. Looks nice and tight. Will caulk those holes too.

So, hooked it all up and man, whatta beauty ! I can slow motor down to something like 60 RPM and still it has insane torque. Changing direction is a
switch-flip away.

I programmed the ramp-up and R-down to be in 10secs range, as per KB's instructions (this way, when I have me 12" contact wheel spinning at max RPM, it won't fry the motor or semis trying to stop it in 2 secs).

If all the steel shows up next week, I just might have a finished product by next weekend :)

I wish they had a custom-cut online metal supply store (like onlinemetals) on East Coast
 
Cool deal! Variable speed will change your life!

That's a hell of a deal on the VFD. Could you PM me with the details of where it came from?
 
Wow great score I'd also like the details if you have them. PM or e-mail works for me. I have a KMG on the way to replace my coote and would like to go VS if I can fit it in the budget :eek:
 
http://www.state-electric.com/id6.html is where I got the KBAC-27D from.
They will, as any salesperson worth his salt would, give you $400-something
price. Just tell them you want it for $312 :)

The motor is part # 4LX13 @:

http://www.grainger.com

Since my company has an acct there, I got it for $178

In principle, you can buy Baldor, leeson, emerson , dayton, GE anywhere you want.
Just make sure it is "Inverter-duty", TEFC, 2 HP, 3500-3600 RPM (as opposed
to 1750).

With 3600 motor, you retain the torque all the way down to 0 RPM (well, almost) AND can use 5" OD drive wheel, as opposed to going 1750 RPM
and then you either have to use a giant drive wheel OR over-hertz the motor
and then you will loose torque @ higher RPMs
 
Please note that if you run the VFD in "Constant Torque" mode, which is
default from the factory, the VFD will try boosting the torque @ lower RPMs
and as a result, you might feel "beats" or shakes, in 3-8 beats/sec, @ lower
RPMs. To get rid of them, if you need to, you will have to sacrifice the torque and go into "Variable Torque" mode (jumper J10 inside of the box).
 
Great price on that VFD -- I'm going to have to bookmark that for future purchasing!
 
You must log in or register to reply here.
Back
Top