text: <s>[INST] PF4 Fault with no errors Edit: Meant to put title as no fault codes. Over the last few months, we have experienced numerous VFD alarms on a certain machine. When this occurs, there is normally no indication of a fault or a fault code on any of the four VFD's. I have determined that if I stop and restart all the VFD's in the cabinet the alarm is able to be cleared. I've read through the manual and have not been able to find anything that seems to point to a possibility of what to look for. It happens at random times. Thank you for any help. [/INST] Ryan, d007-d009 has the fault history. Fault codes are listed on p67 in the manual It is possible something is telling the drive to stop.. e.g. PLC, local IO... thus no fault is indicated? You mention the alarm is able to be cleared . I'm guessing this is an alarm on the HMI screen? There could be logic in the PLC that detects a condition, set an alarm in the HMI, and stops the VFD. \\n </s>