1.the control panel indicates that the voltmeter is bad
2.The "automatic-manual-de-excitation" switch on the control panel is in the de-excitation position (automatic generator set function).
3.Wiring error.
4.no residual magnetism or residual magnetism is too low.
5.Poor contact between carbon brush and collector ring or insufficient pressure of carbon brush spring (three-wave brush motor).
6.carbon brush holding rust or toner stuck carbon brush so that the carbon brush can not move up and down (three wave brush motor).
7.The rectification on the excitation rectifier board has an open circuit or a freewheeling diode short circuit (three-wave brushed motor).
8.The rotary rectifier module is damaged.
9.diesel generator winding or excitation winding broken or poor contact.