MHennel
Member
I have a system that has about 40 PowerFlex 525 VFD's on it. They are all running conveyor belts, not a difficult application. Most are 1HP Motors. I have one of them that that on occasion will loose the at reference signal back to the PLC (Over Ethernet). When trending the at reference signal and the output frequency signals from the VFD, I loose the at reference signal for a second or so when the out frequency jumps from 60 to 61HZ for a short instance. The VFD is set to run at 60HZ. I have never noticed and issue like this before. I don't understand why the VFD output frequency occasional jumps to 61HZ. It is set to a max frequency of 60HZ.
Has anyone run into something like this before. it is only happening on one VFD and it is a small belt with very little drag on it.
Has anyone run into something like this before. it is only happening on one VFD and it is a small belt with very little drag on it.