Overvoltage fault during normal operation of the inverter
Overvoltage fault during normal operation of the inverter
If the output load has a clutch, it may cause a VFD overvoltage fault. If the load drops suddenly, the motor speed may increase rapidly causing a regenerative load. If this is the case, dynamic braking may help absorb energy. Dynamic brakes remove energy from the bus and burn it off as heat. For high voltage lines, and applications where conveyor loads are light, it may be sufficient to convert the motor to a regenerative load. The drive can only absorb regenerative power to a certain extent, but too much can cause a VFD overvoltage failure. If the load is known to be stable and the torque requirement has not changed significantly, check the input wiring to the drive.