Kbac-27d

Does anyone have photos of the internal wiring of KBAC-27D wired for the 240v usage? Every video on YouTube is guys running their VFD off of 110V.

On the left side of the machine (for arguments sake let’s say I am using 10 gauge wire) 10-3 wiring hooks up the VFD to the motor, Black, Red, White, Ground...no problem that’s clear.

Now on the power side. I have run 10-2 wire from where my grinder will be, receptacle/plug etc, over to where my panel will be with a 240v 20 amp breaker. I did this because it was my understanding because I was going to use 240v power the right side of the VFD L1 L2 would be both hot, Black and Red.

When wiring it 110v L1 is hot Black and L2 is White neutral.

Someone correct me, or put my mind at ease I have it right lol

Cheers,

Griff

 

You need the two hots and one ground for the supply power. No neutral required.

Make sure to set the jumper J1 to 230 V.
Wire L1 and L2 from your hot 1 (black) and hot 2 (red). lastly a green wire to one of the ground screws.






You should be good to go.

If you are setting it up for 115 V, then J1 is set to 115 V and L1 is hot and L2 is neutral.

Dan

 

Perfect! Thanks for putting my mind at ease @dancom

 

Sounds like you're getting ready to roll. Good luck!

 

Hey Dan. Wondering if you know along this line does the motor have to be 3 phase? Can u use a single phase 220v. Ie. from princess auto electronically reversible on the kbac 27d hybrid drive?

 

Hi Robert,

Yes. Three phase motor required.

Single phase motors are constructed differently. Their poles are 180° apart, whereas a three phase motor has poles which are 120° apart. Because a single phase motor doesn't know which direction to rotate when power is applied; they have a starting circuit with a centrifugal switch and capacitor to encourage rotation in the desired direction. Once the motor is up to speed, the centrifugal switch is used to disconnect the starting circuit and the motor continues with this rotation until the power is removed or the motor is stalled.

I have seen cases where guys hack the motor windings and switch and power a single phase motor on a VFD, but from an engineering perspective, this not a good idea. The VFD would need to be over-sized to compensate for the power losses. You're feeding with 2/3 power. In some cases, the VFD is smart and detects the missing motor winding and alarm on something called 'Output phase loss.' To the VFD it appears like a wire has come off a three phase motor. Some drives can be programmed to ignore this alarm, other drives cannot. I am not knowledgeable of the control algorithms in KBAC drives, but I would think there is some monitoring of the output going on other than strictly current for overload.

For the most part, three phase motors are simpler, more reliable and cheaper than single phase motors. No costs or failures associated with centrifugal switches or capacitors. You can probably get a three phase motor from AutomationDirect shipped to your house for cheaper than Princess Auto's single phase of the same horsepower. I think I paid around CA$215 for my last 2HP motor from them. It shipped from Cumming Georgia to Edmonton in five days via FedEx. This is the one I bought for my Sayber OSG a few years back. https://www.automationdirect.com/ad...eneral_purpose/general_purpose/mtrp-002-3bd36 Gets regular use and is still going strong.

Dan

 

Thanks for the info. Really appreciated

 

KBAC-27D here from the guy I dealt with. In U.S funds:

https://www.ebay.com/itm/KB-Electronics-KBAC-27D-AC-motor-control-9520-2HP-6-7A/303569281153

VFD $357.00
Shipping $19.91
Import Taxes $53.61

Total $430.52 U.S or $592.89 cad at time of posting.

All done through EBay’s global shipping program. Nothing to pay when it gets to your Canadian address.

Here’s some the other part numbers you will/ or might like to source

Forward - Stop - Reverse Switch For 27D #9480 (note this switch works on the 24D also)
Power On/ Off Switch For 27D #9523 (This on / off is for 27D and 29D models)


Check this against Canadian prices before buying

 

That is better price than the Canadian distributor, mind you I have run into distributors / wholesalers that are retail outlets in disguise so this does not surprise me anymore

 

So i got a new kbac 27d Vfd. New 2hp baldor motor. Wired it all up. And nothing happens. Light on vfd don't come on. I have checked power with a meter from main panel to new 20 amp plug and cord to vfd to motor. All checks out ok. This cant be this hard. Anyone have any thoughts of what is going on. I started all overMany times gone through step by step. Missing something.

 

Start at the input. Do you have 240V coming to L1 & L2? Assuming you are going with 240V for full horsepower.

 

Yes i do.

 

Strikes me odd that the green light doesnt light up. And i have full power to motor

 

Jumper J1 set to 230V position? Is there are Line power switch installed or two jumpers on L1A and L1B and L2A and L2B?

 

Can you take a picture of the mainboard?

 

That is strange if the motor is running while the VFD is off. Highly unusual.

 

Yep that is right. 230v. I put the switch in as an extra. then to took it out Tonight thinking maybe the switch. So i out the jumpers back and still nothing

 

Sorry motor not running but i have power to the motor leads

 

It could be some leakage through the IGBTs that fire the motor. It may read something with the meter is it's very high impedance. If you have J1 @ 230V position and the jumpers in, at L1 and L2 are 230 V across them, then the power LED should be on.