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variable frequency drives

how they work ........ please read before you call me at 3 am and ask why I sent the wrong motor .it could happen lol.

sometimes I get calls ,and the question is why did you send me a 220 volt 3 phase motor . I don't have 220 volt and I definitely don't have 3 phase power in my residential home . I did send you the right stuff .

the answer is if you want a variable speed drive to control your motor this is how they are set up .

the drive acts as a phase converter

1 phase to 3 phase & sometimes a step up from 110 to 220 

the drive takes 1 phase 110V / 220V converts it to 220 volt 3 phase power to run the motor .

the speed is regulated by varying the HZ sent to the motor . ac electric power has a 60 hz frequency per second . drives lower this frequency to slow down the speed . for example a motor that is 220 V 3 phase 60 hz rpm 3450 at 60 hz will turn at 3450 rpm & 30 hz = 1725 rpm 15 hz = 862.5 .and at 0 hz the rpm will be 0

the amount of power needed to run a belt grinder just would not work with a simple 110 volt dimmer switch . besides the 110 volt 1 phase motors have a big capacitor that would blow up if you did try it .


& IP 51

NEMA 4 Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against access to hazardous parts; to provide a degree of protection of the equipment inside the enclosure against ingress of solid foreign objects (falling dirt and windblown dust); to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, snow, splashing water, and hose directed water); and that will be undamaged by the external formation of ice on the enclosure.


kbac-24 now included with ph427

standard model . 

nema 4 drive for you ph427

1 hp

great drive ,rugged aluminum enclosure . rated for indoor / outdoor , will withstand ,rain , splashed water ,spilled coffee,dust and metal chips.

fully enclosed aluminum case dust/liquid splash proof nema 4 new in box with mfg warranty 

kbac27 NEMA 4

110 V up to 1.5 hp

220 V for 2 hp

this is the standard dive you will get with all 1.5 hp or 2 hp upgrade orders .

great drive ,rugged aluminum enclosure . rated for indoor / outdoor , will withstand ,rain , splashed water ,spilled coffee,dust and metal chips.

Lenze AC Tech SMVector

availble in 1 hp to 3 hp 

ESV112N01SXC Lenze AC Tech SMVector 1.5 HP (1.1 kW), 120-240V single phase input NEMA 4 (IP65) 

out all the drives I have used over the years this is the best overall performer . speed regulation is precise down to the 10th of a second . has ramp up and ramp down that can be set to stop or start the drive at a set speed . I have mine set at 7 seconds start and 10 seconds to stop .

I use a 3 hp 220volt ac tech nema 4 to run my 2 hp stainless steel BALDOR motor . I push that motor hard ,lean into it and run it at top speed 7500 SFPM and it will push right through everything I throw at it .

I used a baldor VS1MX nema 4 harsh duty and a kbac 27d and neither came close to this drive .

in my opinion this is a far superior variable speed drive compared to the kbac series drives . optional speed potentiometer can be set up on these drives as shown in first picture

if you want a a reliable tough drive then this is it . highly recommended. 

1.5 hp drive 115 volt input

2 hp drive 220 volt input

Upgrade from kbac 27d                85.00  

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