3 Danfoss drive VLT 5000 are giving Warning 34 for Communication fault this occurred after a power surge .3 other drives on the same profibus network are ok.I have gone thru the manual and not success, we have copied parameters of one healthy danfoss to the faulty ones, tried even to change the profibus cable but the warning is still.Please i do believe the drives are ok can it be a hardware or software fault ? please assist

Now that you have copied the parameters did you check that you do not now have two VFDs on the network with the same Profibus address?

Also, I am not real familiar with the Profibus interface of the VLT drives, but most drives I have encountered will require rebooting the controller when changing the Profibus address or mode.

Hi,

VLT 5000 series has been obsolete for a while now. I'm not sure if the manuals are available on their site.