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3 BRUSH
The brushes must be smooth where they contact the slip
rings. If not, polish smooth the brushes with sandpaper.
A brush that is not smooth produces arcs between the
brush and slip ring leading to possible damage.
A brush shorter than 5 mm must be replaced because
decreased contact pressure between the brush and slip
ring lowers generator efficiency and output voltage.
Brush
Brush holder
5 mm
4 AC CIRCUIT BREAKER
Check continuity between each of two terminals at the
rear of the AC circuit breaker while it is mounted on the
control panel.
Circuit breaker
No continuity
Continuity
(5) DC CIRCUIT BREAKER
Check that there is continuity between the two terminals
of DC circuit breaker when its push button is pressed.