| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the occurrence of a defect that an equipment continues to run without checking the supply voltage and the power supply battery overdischarges and shortens its life, in a running equipment which is self-traveled by the driving force of a power supply battery. SOLUTION: In a structure that voltage is applied to a driving motor M from a battery B through a controlling circuit C, a supply voltage detecting circuit Ca is installed in a voltage inputting section of the controlling circuit C which receives the voltage from the battery B. Due to the presence of the supply voltage detecting circuit Ca, the operation of the driving motor M is stopped when the detected voltage becomes a set value or below, a further discharging of the battery B is prevented, and an alarm is sent out by an alarm lamp 23 and an alarm buzzer 24 to start charging of the battery as soon as possible. |
