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It's a good bet to drive manual will tell you what the alarm means. Armature over-voltage probably means that you have a load that was feeding energy back into the drive and it has nowhere to go so it trips. One way to deal with this is to use four-quadrant drives so the energy can go back to the line.
As Bob says, your fault has to do with the DC Drive, not the PLC. The PLC is likely "talking" to the drive in some way and might be recording and displaying the fault for you, but it's being done by the drive. He's also correct in what that fault means. I believe that drive IS already a 4 quadrant drive, meaning it should be capable of putting the excess energy back into the line rather than trip off. So it might be that someone has turned that off not knowing what it meant, or it could be a failing component in the drive.
It might be a good idea to call A-Bs field service on this one. Probably 50% of their Field Service Engineers came with the Reliance merger, that's mostly what they were after, because as a competitor, Reliance had already faded. But the good news is that it's highly likely that the FSE they send you will know all about that drive. But don't delay, most of them are now approaching retirement age!. The bad news is that many of the components in those drives are no longer manufactured, so it might end up that it can't be fixed (if it's bad) and replacement may be the best course of action. The SLC500s are also getting old and although not officially obsolete yet, it's coming in the next couple of years because parts are also getting less available. So in the long run, that should be considered too.
PS:
Sorry, my mistake, that version (S
6) of the Flexpak 3000 is NOT 4 quadrant (regenerative). it needed to be an S
6R. So in the original design of your machine, either it is never supposed to be turning faster than the drive tells it (no overhauling load), or they were dealing with braking in some other way and that has stopped functioning.
