Ken Roach
Lifetime Supporting Member + Moderator
Thank you for posting the schematic of the actuator controls.
Most of the posts on this thread were assuming that the PowerFlex is directly controlling a motor that's part of an actuator of some kind.
The Auma brand motorized valve actuator shown in that schematic has its own control board and derives control power from the AC line. Most importantly, it also has its own reversing contactor, labeled K1 and K2.
It also has a component labeled "PC", a Phase Correction detection device.
What I think is happening is that this actuator was not designed to be connected to a VFD. The Phase Correction device is being confused by the synthetic sine wave coming from the PowerFlex.
The drawing has a note that says "drawing shown without Phase Correction. Open-Close will be switched if activated".
I think that the solution to this problem will be to disable the Phase Correction feature. I'm not familiar with how those work, so I cannot suggest a method.
Most of the posts on this thread were assuming that the PowerFlex is directly controlling a motor that's part of an actuator of some kind.
The Auma brand motorized valve actuator shown in that schematic has its own control board and derives control power from the AC line. Most importantly, it also has its own reversing contactor, labeled K1 and K2.
It also has a component labeled "PC", a Phase Correction detection device.
What I think is happening is that this actuator was not designed to be connected to a VFD. The Phase Correction device is being confused by the synthetic sine wave coming from the PowerFlex.
The drawing has a note that says "drawing shown without Phase Correction. Open-Close will be switched if activated".
I think that the solution to this problem will be to disable the Phase Correction feature. I'm not familiar with how those work, so I cannot suggest a method.