Re: VFD issue with 3 Phase power supply
¿ªÔÆÌåÓýI am also going to lower the current limit in the programming to see what happens as it¡¯s a really easy test.? The new VFD is rated for like 19.6A output and I am only running at 11.8 so probably nothing but an easy test. ? From: [email protected] <[email protected]>
On Behalf Of David Kumm
Sent: Friday, June 4, 2021 10:24 AM To: [email protected] Subject: Re: [FOG] VFD issue with 3 Phase power supply ? Once you verify the motor is fine without the vfd, and the utility power is balanced going into the vfd, it would seem the vfd is at least part of the problem.? I'm voting that the motor has issues until you rule that out.? Dave ? From:
[email protected] <[email protected]> on behalf of Joe Jensen <joe.jensen@...> ? Some more background.? I brought the idea of variable speed to increase suction on small ports to Robert founder of Oneida at the Vegas show like 10 years ago.? We traded a ton of emails and he swore me to secrecy and the idea became the Oneida Smart collector which won innovation of the year at either Vegas or Atlanta.? In appreciation for the idea Oneida upgraded my collector to a 5HP Smart collector, single phase input. ? Lately I was having some issues with the 10 year old VFD shutting down and Oneida was very helpful and we found that for some reason some of the parameters were corrupted in the old single phase VFD.? Through this process I learned a lot about programming VFDs and I realized that the programming of the VFD was set to limit output current (the current limit of the original VFD) to 8.9A. The 5HP Baldor high efficiency motor is rated at 11.8A.? In running the VFD and watching parameters I realized that the motor was never even getting to 60 HZ due to the current limit. ? So I decided to upgrade the VFD to a 3 phase input. Same series ABB but at least with the ABB ACS310 series they are built as single phase input or 3 phase input.? So I ordered an ACS310 5HP 3 phase input VFD.? Super easy install as the programming just copies over. ? But the new VFD faults.? Last week it would fault after a few minutes.? When measuring the input currents the delta then was about 30%.? Over the weekend it didn¡¯t fault at all and the current deltas were 20% or so. ?ABB sent a replacement VFD and it did not solve the issue.? Last night would get faults in less than a minute and the current delta was over 40%. ? More background:
? Can a phase error between the phases cause lower current in one leg? ? From: [email protected] <[email protected]>
On Behalf Of imranindiana via groups.io ? Hi Joe, ? More thoughts after rereading your post. ? You mention original VFD as single phase and new as 3 phase input. This could be important if you are running with single phase input. ? At first I thought you were running new VFD with single phase input but you report 3 input currents. Just curious, why are you using a VFD with 3 phase input on a dust collector with a 3 phase motor? ? Another thought. I am sure you know this, on a VFD, the single or 3 phase input is used to create a DC power supply. This to me means that there should not be a repeatable phase relationship between input and output currents. A resolution to your problem can help further our understanding of how these things work. ? Imran
? I had to replace the VFD on my dust collector. It was an ABB ACS310 single phase input feeding a 3 phase 5 HP motor. This was from Oneida and because of the single phase supply they set the max current at the limit of the drive which is below the amperage of the motor. Anyway the new drive, an ABB ACS310 5HP 3 phase input VFD, faults with my utility delta 3 phase supply. The fault is due to uneven current on the input. I¡¯ve spent hours measuring and testing and worked with ABB tech support several times. The key test ABB had me do was to swap two wires to see if the low current moves. It does not so ABB said not the drive. But they did approve a warranty swap. With the replacement I see the same problem. With leg A I get 20A leg B 15A and leg C 19A. Leg C is the wild leg. The voltages under load for legs A and B are within 0.2V. I also had the utility out and then measured and said all good on their side. They did not put a scope on the lines to see is I have phase shift issues. Could a phase different between the lines cause a 20-25% current difference when the voltages are the same? ?Also I have notices that the current difference changes. Worst was tonight with 22A, 14A, and 20A.?
|
Joe Jensen