Typically, this occurs due to a short circuit in the output phases of VFD. Please carefully inspect and contact the supplier for the best support. Check for any grounding faults; if present, address them before running the inverter. If intermittent tripping occurs, and there is a considerable distance between VFD and motor, consider adding an AC reactor at VFD’s output terminals. Additionally, it may be caused by: a circuit breaker with a too low rated current, phase-to-phase contact or grounding in the cable connecting VFD and motor, or motor damage. Address these issues before attempting to run VFD again.