What is the fault of Danfoss fc302 inverter display 1ro?

According to your description, the fault is: 10V voltage is low. Troubleshooting: Remove the lead of terminal 50. If the warning disappears, it is a wiring problem. If the warning does not disappear, the control card needs to be replaced. If you still don't understand, you can consult the martial arts of Tianjin Doujin Technology Co., Ltd. You are very experienced in the maintenance of Danfoss. I hope I can help you.