Reconfiguring KMG KBAC 27D from 110 to 220V

PIndelicato

PIndelicato

Joined
Sep 16, 2002
Messages
1,577
Hello,

I'm thinking about switching my VFD over from 110v to 220v. I pulled out the KBAC manual, and just wanted to make sure I'm not missing anything:

-Switch internal jumper from 110 to 220

-Swap out power supply cord



Is that all there is to it?

Dumb question...could I just change out the plug on my current power cord, or does 220 require a different type of cable?
 
PIndelicato said:
I'm thinking about switching my VFD over from 110v to 220v. I pulled out the KBAC manual, and just wanted to make sure I'm not missing anything:
-Switch internal jumper from 110 to 220
-Swap out power supply cord
Is that all there is to it?

Dumb question...could I just change out the plug on my current power cord, or does 220 require a different type of cable?
Click to expand...

That's all there is to it.

Assuming that you have a decent gauge wire on the power cord, you can just change the plug.
In fact going to the 220 means that each wire carries less current and could be thinner (no need to go to a heavier wire)
 
Do you already have a 220v outlet wired? If so 12/2 would be ideal but I guess 14/2 would work for the plug.
 
At least on mine, besides from the wired jumper there is also a selectable switch over on the right where you can select 230v or 115v.
 
Yes, I have the outlet available...just need to rewire the grinder. I do not recall a switch inside the VFD, only the jumper. I will look for that as well. I believe my current power cord is 12ga.

Thanks all!
 
Your motor is already wired for what it needs to operate since it's working. So you only need to change the feed input to the kbac (the power plug wire to the wall). Then change the internal jumper J1.

Jumper J1 for the INPUT voltage. It should be the topmost jumper....

From the manual:
"LINE INPUT VOLTAGE
SELECTION (J1 (MODELS
KBAC-24D, 27D ONLY)) –
Jumper J1 is factory installed
on Terminal “230V” for 208/230 Volt AC line input. For 115 Volt AC line input, the jumper must be
removed and installed on Terminal “115V”. See Figure 16."
 
If the motor is 120 240 capable you may want to check if anything needs to be changed at the motor as well. Mine requires using a different internal tap for the different voltages.
 
OK, I finally got the new plug installed and tested it and it seems to run fine. Thanks for the help!

While I am changing things around...I set this up originally per the instructions that came with it from KMG, but it seems that some other suppliers of the same drive are also recommending changing another jumper to '2X'. Apparently this runs the motor at twice its rated speed. Is this a good idea? Will it wear out the motor or drive prematurely? What are the pros and cons?
 
What speed is your motor Paul? Mine is 1725rpm and I almost never even run it full speed.
I am no expert but I don't see how this could not have an adverse effect in the long run and not sure you need it.
 
Mine's the same, Pat. On occasional I wish it would run a tad faster, but not all that often and I'm not sure it's worth the potential downsides. The drive has the feature though, so there must be something it is used for?
 
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