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Thread: VFD earth problem
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28th January 2012, 06:36 PM #1Senior Member
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VFD earth problem
I've been impatient waiting for my electrican to get back from Mt Isa and wired up the Vfd myself everything worked fine on the bench although i did have the supply side earth hooked up to one of the phantom earth terminals on these HY'S.
So I thought bolt her on and give it a run, with the inbound and outbound earth wire
to the earth terminal next to the U V W screws i turned the power on' it tripped the earth leakage unit, next i disconnected the earth to the motor, same thing only also tripped circuit breaker on shed and also the house, I then removed the supply earth from vfd and joined it to the motor earth the vfd powered up but is not producing enough power to wind the drill over.
I've check everything 3 times , the Ohm meter reads all good , the sparky will be here on Tuesday with a Megger but he doesn't know Vfd's, I'm going to try and post a few photo's.
Any idea's please
P.S. Is there a "Posting Photo's for Idiot's" thread somewhere
Paul
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28th January 2012 06:36 PM # ADSGoogle Adsense Advertisement
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28th January 2012, 06:47 PM #2GOLD MEMBER
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Hi Paul,
What do you have PD004 set at?
Stuart
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28th January 2012, 06:49 PM #3Senior Member
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Hi Stuart
Pd004 I changed to 50 from 400
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28th January 2012, 07:21 PM #4
Your wiring of the earth connection in the first picture looks right and is exactly like mine (working fine).
I suspect you have an earth fault or winding connection error in you motor. Can you positively confirm the delta connection of your motor? No swapped black wires from one coil to another?
Can you check the internal resistance between all motor windings to motor frame and to each other?
Don't let your sparky connect the megger to your VFD!
Disconnect the cables at the VFD before you let him loose on the motor and keep him away from the VFD terminals....
Joe
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28th January 2012, 07:44 PM #5Senior Member
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Hi Joe
We dug the Star point out and paired the wires with zip ties, I checked them again with Ohm meter before screwing to terminal block , the sparky never had his megger that day so the fields haven't been tested properly.
The Vfd is 1.5kw and tne Model no ends in 523 i'm wondering if it has the wrong Label on the terminal bar and the earth is at the other end like some others
Thanks for the warning about the Megger+ VFD + Sparky =
Paul
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28th January 2012, 09:13 PM #6
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28th January 2012, 11:10 PM #7
I'd be looking for moisture/geckos/frogs/mice/etc.
Cliff.
If you find a post of mine that is missing a pic that you'd like to see, let me know & I'll see if I can find a copy.
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28th January 2012, 11:35 PM #8Member
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- Apr 2009
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- Horsham
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Hi Paul,
I had a quick look over your posts and noted that your VFD is a 523 whereas the one I have is a 223B so this may not help but my mains is wired differently to yours.
Attachment 196475
Maybe just check to make sure your inputs are going to the right terminals. I am not condoning any electrical work by unqualified personel, but it wont hurt just looking now will it ...
Jayson.
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29th January 2012, 01:23 AM #9
Hi Jayson,
I have Huanyang's wired like so.
Not sure just how much difference it really makes whether you feed the single phase into R and T or R and S. I think they all feed the three phase rectifier.
But you make a good point. When things don't work as expected check everything.
Sorry I can't really help with why the earth leakage is tripping... I'd be looking at why it worked fine on the bench, I assume you had the motor on the bench when you were testing, and then bolted the motor up to the machine, and then it trips the earth leakage, I'd be thinking it might be some earth leakage path on the machine...
Get your sparky to megger the motor in situ before going any further...
Regards
Ray
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29th January 2012, 07:46 AM #10Senior Member
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Thanks Fella's
Phil
Both shed and house are using 20 amp CB's
Cliff
There's plenty of gecko's, Vfd has been out of box for only 1 week and the motor has equal resistance on the 3 fields of 9, would that be enough time for them
Jayson
The CNC boys top Guru recomended the T terminal but they seem to work ok on S
Ray
I'm waiting for sparky now, I am just doing a bit of ground work for him from the Forum
Is that a factory potentiometer on your Vfd
Thanks Again
Paul
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29th January 2012, 08:18 AM #11
When I was involved with them the makers use to use the argument that their drives were tripping the ELCB because they were a piece of industrial equipment and not meant for a domestic supply, but if you guys are getting these things off the internet from overseas they may not meet Australian standards.
From memory the going advice was to increase the rating of the ELCB from 20mA to 40mA
Out of interest does your VVF drive have a Ctic accreditation if it does not, it is not certified for this country. this could affect any insurance claims in the future.Two things are infinite: the universe and human stupidity; and I´m not so sure about the universe.
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29th January 2012, 10:10 AM #12
Did you see this in the manual?
(If using ground fault circuit interrupter, please choose one corresponding to high frequency)Cliff.
If you find a post of mine that is missing a pic that you'd like to see, let me know & I'll see if I can find a copy.
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29th January 2012, 11:32 AM #13Senior Member
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Phil
I hope your right about the CB's that will be a easy fix
I doubt these units have CTIC but at 1/3 of the price of a quality unit and for w/e use only it is the best way for me to go, although I wish I would have went to a single phase motor now with all this B/S
Cliff
Thanks mate I did see that but didn't realize they were the same as EL unit, That's one for the sparky
Regards Paul
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29th January 2012, 02:17 PM #14
Hi Paul, No, but it's an easy modification if you wanted to add it. Joe Hovel posted on CNCzone how to do it.. (Thanks Joe ) You need a pot that fits the mounting holes, and there is a jumper that you need to change.
I can write up the details if you are interested..
Regards
Ray
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29th January 2012, 03:41 PM #15Two things are infinite: the universe and human stupidity; and I´m not so sure about the universe.
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