The reason for this issue with the variable frequency drive may be: The voltage supplied to the VFD is inappropriate. The rectifier bridge is damaged. The charging resistor or the switching power supply is faulty.

You should check the following:

• Use a voltmeter to measure voltage supplied to VFD and ensure it matches VFD’s rated voltage. If it doesn’t, address issue and supply the correct voltage.
• Check if the “CHARGE” indicator light is on. If it’s off, problem is likely related to a damaged rectifier bridge or charging resistor. If light is on, there might be an issue with the switching power supply. In this case, contact supplier for the best assistance.