HELP WITH VFD NEEDED

C

Craig Daniel

Joined
Feb 17, 2016
Messages
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I bought one of the cheap ebay 3 hp vfd's and wired everything up and set a few parameters, I use the vfd no more than 2 hours and it started to pop, spark and smoke and died. What do you guys recommend? I have a baldor super e 1 hp, 3 phase motor that the vfd was used on so I don't think anything is wrong on that end, The power supply is 30 amp DP breaker, 220 volt. Any help is appreciated as electricity is not my specialty.By the way this is the second vfd that has been fried, The other was a baldor vfd.
 
First of all, what are you using this VFD on?

How long did the Baldor VFD lasts? Did it run good while it was running?

For the 2 hrs the Chinese VFD ran, how did it run? Full speed? What % of full load were you putting on VFD/motor?

Do you have a link to the Chinese drive you used? OR, even better a link to the manual for YOUR Chinese VFD? That will allow us to check the required parameters compared to what your settings are.

Ken H>
 
The vfd is running a 9 inch disc grinder, Both vfd's ran really good but when I put a little more pressure and ran the speed up a little that's when they both died. I'll try to get my wife to put a link to the Chinese vfd.
 
OK, let's get this clear - the very first time you ran either VFD up to max speed and put a load on them they stopped? If so, I'll bet you've got some parameters not set correctly. Once they die, and allowed to cool will they run again? OR - dead as in DEAD forever and ever?

When you run up to max speed, are you sure they're actually turning at rated motor speed?
 
I ran the vfd's at 3/4 speed, The vfd's will not power up at all. The China vfd shot sparks at me and smoked pretty bad, The last time I ran the Baldor which was 10 months ago it was running but showed an error. I tried to power it up this fall and nothing would come on and that's why I bought the China vfd. The motor is rated at 60hz, 1hp, 3.1 amps, 1760 rpm.That is the parameters I set the vfd to so I am stumped at this point, I always had my Father in law who has been a certified electrician all his life to help me but he has a malignant brain tumor and does not function as he once did. Thanks a lot for the help!
 
I would stop using the vfd's you have as well as the motor
It would seem from here, one is smoking the other

Get a good new one of each
 
With your limited experience my first step would be to take motor (and VFDS) to a motor repair shop for testing to make sure motor is good. They should then be able to check parameters and connect VFD to motor to test if the VFD is good or not. SInce it's a disk grinder it will be fairly easy to take total unit to repair shop for testing.

Without being able to see the wiring (or good photos) and the parameters you have set in VFD it's really hard to offer suggestions. From your post it sounds like the very first time you tried to run either VFD, it got up to perhaps 3/4s speed, and when you tried to load the drive it failed? That sounds more like settings in VFD are not correct - but again, it's really hard to determine from here.
 
Thanks a lot for the help, I found a local electrician that will come to my house and check the set up out for free but it will be a week or so to get here, No big deal because I have a back up 6 inch.
 
Craig Daniel said:
I bought one of the cheap ebay 3 hp vfd's and wired everything up and set a few parameters, I use the vfd no more than 2 hours and it started to pop, spark and smoke and died. What do you guys recommend? I have a baldor super e 1 hp, 3 phase motor that the vfd was used on so I don't think anything is wrong on that end, The power supply is 30 amp DP breaker, 220 volt. Any help is appreciated as electricity is not my specialty.By the way this is the second vfd that has been fried, The other was a baldor vfd.
Click to expand...

Craig Daniel said:
I put a little more pressure and ran the speed up a little that's when they both died
Click to expand...

The above descriptions, combined with the use of the term "grinder", rather than "sander", in the subject line and post #4, would lead me to ask what was being ground at the time.

Whilst I get the impression that the VFD is felt to be at fault in most of the posts above, the scenario I am getting is that everything worked fine, right up to the point where the operator started getting a significant amount of metal dust into the air, at which time, the (unsealed?) VFD let the magic smoke out. Twice.

If this is indeed what happened, the solution is to isolate the (next) VFD from the airborne metallic dust. Various approaches to this have been adopted and can be found online. My personal preference is either I to use an IP66 drive or to mount an IP20 drive in an IP66 enclosure.

If it is not what happened, pictures and more information would help and we can all try to diagnose the real problem.
 
I appreciate all the help and will let you guys know when my electrician friend comes over and gives me a diagnosis.
 
I'm sure you've considered it, but early on I smoked an unsealed vfd with grinding dust. I wasnt even using it. It was sitting g on the be changed behind me and I ground just 2 knives before I hooked it up and *poof*
 
Kevin McGovern said:
I'm sure you've considered it, but early on I smoked an unsealed vfd with grinding dust. I wasnt even using it. It was sitting g on the be changed behind me and I ground just 2 knives before I hooked it up and *poof*
Click to expand...
It is god idea to protect plug from dust , used one or free one .............
 
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