As I said, it is only "educated" guessing until we know different. I am not just assuming it's a PowerFlex because it's all I know. That was said in jest.
But I'm sensing a tone of "You must think the Automation World revolves around Allen Bradley?" You know, it just might? But that's for another thread.
I've worked with most of the above drives at one time or another in the past. At my current place of work we have AB Bulletin 160, 1336 and PowerFlex 4/40/525/700 drives. We also have Siemens MM440, Sew Movimot, Telemechanique Altivar, ABB, Mitsubishi, Yaskawa, Lenze, Bosch Rexroth, Maxor, and lesser drives.
In my experience with these many types of drives, of which a couple of them do indeed also have a possible F004 fault, the F004 UnderVoltage fault on the PowerFlex drives is by far the most common nuisance fault I have come across, with Emergency Stop circuits being the No.1 culprit. Operators love using E-Stop buttons as regular Stop buttons. It's just been my experience thus far, so I threw it out there as a precursor while we wait.
As a contrary example, I have never experienced an F004 on the SEW drives. It's not that it does not happen unless I say so, but again, from my experience, I have not had one yet and even if it did happen once it would still be negligible compared to the number of times I've come across the equivalent fault on the PowerFlex drives.
So, I am making an educated guess, perhaps also for the fun of it while we wait, based on my to date experience, which would place the PowerFlex drives as odds on favourite to win this race. Of course there are no sure things, so I'm only willing to bet pocket change, as Ron would put it.
Also, someone reading the above might just have learned something they didn't know regarding the PowerFlex F004 fault.
If it's not a PowerFlex, then we can move on. No harm, no foul. I certainly never have a problem with being "wrong", especially if it's somewhat informative along the way.
I do hope you can sleep tonight over this?
Regards,
George