Honda HRM300 Manual page 180

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RUNNING SPEED ADJUSTMENT
To maintain uniform blade rotation frequency the ECU monitors the current load placed on the battery.
The ECU will adapt the wheel rotation speed to the load applied to the blades.
NORMAL
The blade rotates 360 degrees as to reduce the impact when hitting an obstruction.
BLADE
If the load remains constant even when the wheel rotation stops, the ECU will stop the blade motor and exit the area.
SLOW
BLADE
OBSTRUCTIONS
TECHNICAL FEATURES
NORMAL
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