I have an Allen-Bradley Powerflex 4 VFD sitting on my desk that failed earlier in the week. Every time I'd try to start the motor, it would come up with fault F005, which is an over-voltage fault. The other two VFD in the same cabinet that run from the same power feed displayed the same buss voltage, 330-340 vdc. This one was made in December of 2005. It doesn't get heavy use, but it does sit powered up pretty much all the time.
Does this sound like a main filter cap fault that is allowing excess ripple on the DC buss, or is it not something I could probably actually fix? I've already purchased a replacement drive, so if I can fix this it would just be for my own use at home. Replacing the caps wouldn't be a problem for me, but I don't want to waste my time or money if that probably isn't it. A quick visual inspection doesn't show any obvious problems, no burn marks, no bulged or leaky caps. All Nichicon parts too, not offbrand junk.
Does this sound like a main filter cap fault that is allowing excess ripple on the DC buss, or is it not something I could probably actually fix? I've already purchased a replacement drive, so if I can fix this it would just be for my own use at home. Replacing the caps wouldn't be a problem for me, but I don't want to waste my time or money if that probably isn't it. A quick visual inspection doesn't show any obvious problems, no burn marks, no bulged or leaky caps. All Nichicon parts too, not offbrand junk.