Yaskawa J7 Vfd Giving Oc Fault Without Motor Connnected

[Techie1961]

I'm trying to connect a VFD that I had kicking around to control a belt sander that I'm rebuilding. I wasn't sure of the condition of the drive so connected it up and give it a spin. It powers up the display okay and I can do programming on it but when I try to put it in RUN mode, I get an OC message right away. Even without a motor attached. Some reading points me an IGBT being shot.

Anyone have any experience with these that can share their knowledge? I'm not adverse to opening this up and replacing components but don't want to mess up a drive that otherwise might be okay.
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[Chip Hacket]

I have used these before. I'm afraid this doesn't look good. With power removed make sure there are no shorts at the T lead connections. May want to reset the parameters to factory default and try running from the keypad. It should ramp up to frequency with no motor attached. Verify input voltage of ~220V. Good luck.


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[mmprestine]

Was the drive used prior to this? If so, reset all the parameters back to stock and retry the tests. There is a parameter to reset to default.

 

[Techie1961]

Was the drive used prior to this? If so, reset all the parameters back to stock and retry the tests. There is a parameter to reset to default.

Yes it was. I was thinking though that maybe it's because it is connected only on two leads instead of three. I was of the understanding that it will run single phase but maybe there's a setting somewhere.

 

[Techie1961]

Was the drive used prior to this? If so, reset all the parameters back to stock and retry the tests. There is a parameter to reset to default.

I can't seem to find that. There is one for clearing history though.

 

[Techie1961]

I tried the N01 parameter at 12 and 13 and it still gives the oc condition.

 

[Chip Hacket]

Any luck with your VFD

 

[Techie1961]

Any luck with your VFD

Nope! I have tried to disassemble it to look for any apparent failures and pretty much tried everything that I can think of. My experience with these is that there is usually something very visual like a capacitor laying loose inside the enclosure but not with this one.

The only thing that I can think of to try next is to hook it up to 3 phase power.

 

[Steve Shannon]

What does the OC fault signify according to the manual?


Steve Shannon, P.E.

 

[Techie1961]

What does the OC fault signify according to the manual?


Steve Shannon, P.E.

They all seem to be with the motor connected. I think it's likely the drive is shot but was hoping to resurrect it.