Check for armature ground faults with a pass light

The armature is an important component of tributary motors and single-phase series motors. Common faults include winding grounding, short circuit, reverse connection, etc. These can all be detected with a multimeter or megohmmeter. The picture shows the schematic diagram of using a pass light to detect. During inspection, connect the black meter rod with the light on to the rotating shaft (ground), and the red meter rod touches the commutator piece. If the light H does not light up, it means that there is no path between the winding or commutator and the shaft, and there is no ground fault. If the bulb lights up, it means there is a ground fault and should be repaired in time.