marv_tech
Member
Hey All,
I've got a Vacon x4 VFD running in open-vector mode. It is spinning a heavy pin-mill wheel. It gets frequency reference from a PID running in a SLC5.
The PID is not tuned well (but unfortunately I cannot change it). As a result, the drive is constantly hunting, DC bus voltages hit their limit due to decel, which kicks in the dynamic brake, which overheats and eventually faults.
Turning off the dynamic brake leads to (rapid) DC overvoltage faults. Making my decel time longer maybe helps but I still get nuisance faults.
TL;DR: Is there any way for a VFD to allow a high-inertia load to decelerate naturally rather than trying to "absorb" that load?
I've got a Vacon x4 VFD running in open-vector mode. It is spinning a heavy pin-mill wheel. It gets frequency reference from a PID running in a SLC5.
The PID is not tuned well (but unfortunately I cannot change it). As a result, the drive is constantly hunting, DC bus voltages hit their limit due to decel, which kicks in the dynamic brake, which overheats and eventually faults.
Turning off the dynamic brake leads to (rapid) DC overvoltage faults. Making my decel time longer maybe helps but I still get nuisance faults.
TL;DR: Is there any way for a VFD to allow a high-inertia load to decelerate naturally rather than trying to "absorb" that load?