defcon.klaxon
Lifetime Supporting Member
Hi guys,
I'm working on a new project and we have Allen Bradley Powerflex 753 VFDs controlling oxidation ditch aerators. I'm not currently onsite, but the electrician is and we're trying to troubleshoot the analog output that is supposed to be speed reference.
From what the electrician has told me, he has set up the drive to operate in mA loop mode versus voltage mode, including changing a jumper as well. Also, he verified we're in 4-20mA mode and not 0-20mA mode. However, both my PLC's input value and his process meter value show that the drive is outputting significantly more current than it should be, as as the speed reference increased the disparity between values increases as well.
I've never worked on Powerflex VFDs before so I'm not really sure how to help troubleshoot at this point, and the local rep is a flake and isn't returning calls.
Was wondering if anyone here has experience with these VFDs and might have some insight into what's going on? Thanks for the help!
I'm working on a new project and we have Allen Bradley Powerflex 753 VFDs controlling oxidation ditch aerators. I'm not currently onsite, but the electrician is and we're trying to troubleshoot the analog output that is supposed to be speed reference.
From what the electrician has told me, he has set up the drive to operate in mA loop mode versus voltage mode, including changing a jumper as well. Also, he verified we're in 4-20mA mode and not 0-20mA mode. However, both my PLC's input value and his process meter value show that the drive is outputting significantly more current than it should be, as as the speed reference increased the disparity between values increases as well.
I've never worked on Powerflex VFDs before so I'm not really sure how to help troubleshoot at this point, and the local rep is a flake and isn't returning calls.
Was wondering if anyone here has experience with these VFDs and might have some insight into what's going on? Thanks for the help!