More VFD issues

H

Hathenbruck

Joined
Dec 30, 2018
Messages
57
Hey everyone, I'm back with another VFD issue that I can't really find an answer to, or at least an answer in layman's terms.

My KBAC27D and Leeson 2HP motor are running well, except for when I turn up the speed too quickly, or when I'm putting a good amount of pressure on the belt. I'm getting the slow red to yellow, which says it's an overvoltage error. It only flashes once to red and once to yellow before it clears and goes back to normal, but I'd like to fix it.

How do I go about diagnosing and fixing over voltage? I'm hooked up to 220, and last time I checked the voltage it said I was 238.

Thanks in advance!
 
Voltage up to 240 is considered within the normal range. However you might be getting spikes over that. That could be difficult to diagnose. You might consider getting a line conditioner. They come in various price ranges and sizes. Some also have uninterruptible power supplies (UPS) with them. But a line conditioner is different than a UPS. Here's one https://www.tripplite.com/2000w-230...rotection-6-outlets-uniplugint-adapter~LR2000
 
How long and what gauge is the power cord from wall to VFD and from VFD to motor? Do you know the size of the wiring back to your panel? Have you metered the outlet to see what the voltage is?
I assume your jumper is set to the proper voltage?
 
wkfl said:
Call them, they are most accommodating. They’ll walk you through the diagnostics. I had the reverse problem where mine got crazy when I reduced speed. It was a simple pot adjustment.
Click to expand...
Thank you! That sounds like a good solution :)
 
Drew Riley said:
How long and what gauge is the power cord from wall to VFD and from VFD to motor? Do you know the size of the wiring back to your panel? Have you metered the outlet to see what the voltage is?
I assume your jumper is set to the proper voltage?
Click to expand...
The jumper is correct. The power cord is either 15' or 20', can't remember exactly which length I did, and the gauge is 8. From the VFD to the motor, I'm pretty sure it's 14 gauge. From the panel to the outlet, I believe I used either 10 or 12 gauge. I did it a long time ago, so I can't really remember. My welder works just fine on the outlet, if that says anything.
 
Hathenbruck said:
The jumper is correct. The power cord is either 15' or 20', can't remember exactly which length I did, and the gauge is 8. From the VFD to the motor, I'm pretty sure it's 14 gauge. From the panel to the outlet, I believe I used either 10 or 12 gauge. I did it a long time ago, so I can't really remember. My welder works just fine on the outlet, if that says anything.
Click to expand...
On my setup the wiring from the VFD to the motor is 12 gauge. I don't remember if it called out for 12 or not, but 14 seems a bit small.
 
2Hp will draw at most 7 amps, 14 gauge will be ok. I had a similar issue that I corrected by changing ramp up rate, time to go from 0 to preset speed or change speed up or down. That was on a digital VFD so I just changed the preset value. KB should have a similar adjustment by adjusting a pot.
the old sailor
 
scott.livesey said:
2Hp will draw at most 7 amps, 14 gauge will be ok. I had a similar issue that I corrected by changing ramp up rate, time to go from 0 to preset speed or change speed up or down. That was on a digital VFD so I just changed the preset value. KB should have a similar adjustment by adjusting a pot.
the old sailor
Click to expand...
my ramp pot is pretty close to all the way down, but I'll try turning it all the way down and see what happens. Thank you!
 
Hathenbruck said:
14 is what came with the kit. If it needs to be larger, I could swap it out.
Click to expand...

Mine didn't come with any wire. I chose the 12 myself based on what the motor had, which was 12. According to the manual that I found online 14 is what is called for. I should have looked at the manual first. So you should be fine there. Sorry about the misdirection.
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edited to add page from manual URL
https://www.manualslib.com/manual/1397176/Kb-Electronics-Kbac-24d.html?page=15#manual
 
seanj said:
Mine didn't come with any wire. I chose the 12 myself based on what the motor had, which was 12. According to the manual that I found online 14 is what is called for. I should have looked at the manual first. So you should be fine there. Sorry about the misdirection.
Click to expand...

I'm the same way. Had the kit not come with wire, I'd have gone with a larger gauge. Thanks for helping.
 
Your wiring sound fine. I would put a multi-meter on your line terminals inside the KBAC and make sure you're not getting an odd reading. Changing the trim pots might make a difference. Can you provide a picture of your trimpot and jumper settings?
 
Drew Riley said:
Your wiring sound fine. I would put a multi-meter on your line terminals inside the KBAC and make sure you're not getting an odd reading. Changing the trim pots might make a difference. Can you provide a picture of your trimpot and jumper settings?
Click to expand...
I adjusted to accelerate pot, and it seems to be working a lot better now. Thank you!
 
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