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Old 06-23-2009, 04:50 PM   #16
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GFCI problem with pond pump


Exactly, something is allowing current above the GFCI's threshold to flow, but after working, managing and owning businesses in the motor repair field for over 35 years, if I measure say a motor with this particular megger, and it measures over 1000 megohms, if I were to put my hi-pot on it, I have never witnessed one bleed, not at that high value of insulation resistance. So why don't I put my hi-pot on it? I will, I am not near the shop this week. But I am afraid it will NOT show or cause current to flow, I think the insulation system is stable. In my v-tech manuals, [this one is not v-tech it is Minarik] it calls for filters on all drives. What filter it doesn't say. I guess my question now is can some inductive phenomena create enough chaos to the incoming 115 volt line to "fool" it in to thinking there is a differential in the line current and trip?

Thank you to all the REALLY smart people who have been gracious enough to take time from their day, and mess with my ignorance. I have 50 of these things to do, if I can prove or make the damn thing stay on line with a GFCI, as this drive has no PE connection, maybe I should try to go with another drive manufacturere, VTECH in their plastiic enclosures are too big, and then I need to stay within that tight tolerance of plus and minus one rpm, and with a simple dial switch,, no fancy input, no feedback, When I started this project 4 years ago, 8 engineers said this would never work, well it sure did finally work, I had to find someone who would stick with me through it, I agree there are some obvious issues here, if a GFCI trips, it has to sense an unbalance of currents, so we know that the GFCI is seeing that, we have had one unit on several different GFCI Circuits to rid that problem, so it comes back to either drive not grounded, or motor grounded [at least weak enough insulation to allow this tiny amount of current, but I will bet my hipot will not show leakage, I have never seen leakage on a motor that measures over 5000 megohms, is a new winding, nomex, insulation, inverter duty wire, all seems to be perfect with the motor,

Again, thank you all, wish I had run into you guys and gals many years ago. If I can do anything to help you with a motor or rotating device, please look me up, I can usually solve even issues like this, but this one is weird. Will
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Old 04-04-2013, 03:47 PM   #17
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GFCI problem with pond pump


I was experiencing this same issue with several pieces of equipment that I built, using the 110 volt to 220 volt freq drive power buy a GFI outlet. The odd thing was that not all of them had the issue. I found out that if you lower the carrier frequency parameter it will keep the GFI from kicking out.
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Old 04-04-2013, 07:44 PM   #18
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GFCI problem with pond pump


Good suggestions Auto, in the manuals it will give you troubleshooting tips and carrier frequency adjustment is one of them, for noise and other issues, adding the GFCI is also good because both are inexpensive solutions to on going problems that can be resolved due to Auto's time and investigation and I know he spent a lot of time working on these problems so thank you again AUTO
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Old 04-04-2013, 11:23 PM   #19
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GFCI problem with pond pump


This thread is from 2009.
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Old 04-05-2013, 12:35 AM   #20
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SO? There is a search function on here, so it is three years old, I have a thousand or more drives out there running for the National Weather service since 2006 Is there a point here? You ain't my lawyer how old is that?
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Old 04-05-2013, 12:51 AM   #21
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GFCI problem with pond pump


Quote:
Originally Posted by wbwill View Post
SO? There is a search function on here, so it is three years old, I have a thousand or more drives out there running for the National Weather service since 2006 Is there a point here? You ain't my lawyer how old is that?

Well, the OP is no longer around. And by you refreshing this old post, it moves up to the top of the list and detracts from current people who are seeking help.
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Old 04-05-2013, 01:51 PM   #22
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GFCI problem with pond pump


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Originally Posted by wbwill View Post
SO? There is a search function on here, so it is three years old, I have a thousand or more drives out there running for the National Weather service since 2006 Is there a point here? You ain't my lawyer how old is that?
I was mostly responding to Automation Guy, since he's the one who resurrected a zombie thread. This happens frequently around here, when new members don't realize that very old threads do not automatically lock when the discussion has been dead for years. It's just an annoyance to the many people who follow the current discussions on here, because reviving old threads rarely results in productive discussion (this is a perfect example), and if there is useful discussion it's usually not on topic for the original post. Like this.

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