I have some problem with VFD all voltage AC and AC is normal but the VFD screen show NLP.
THE REASON -No line power. When the control part is energized via the RJ45 connector and there is no power on the main input and no run order is present. If the input voltage is good. check how to reset the error code on that VFD. or check if there’s input voltage in the main input of the control voltage control part, or try to swap the control cable.
Nlp = no line power from your cat5 connector
The cat 5 connectors may not be plugged in properly at both ends
See if it will run in manual
It could; also be caused due to an internal error. Communication between control and power board. You must change the control board or complete the VFD.