| 摘要 |
PROBLEM TO BE SOLVED: To provide an unloader energy saving control method.SOLUTION: Power to be supplied to a hydraulic pressure pump electric motor 20 for driving booms 12, 13 during non-operation time of the booms 12, 13 of an unloader 1, and, power to be supplied to transport appliance electric motors 21, 22, 23, 24 for driving transport appliances 14, 16, 17, 18 during non-transport time of the transport appliances 14, 16, 17, 18, are controlled so that voltage and frequency are lowered respectively by a variable voltage variable frequency device for performing idling operation. The hydraulic pressure pump electric motor 20 for driving the booms 12, 13 during operation time of the booms 12, 13 and the transport appliance electric motors 21, 22, 23, 24 for driving the transport appliances 14, 16, 17, 18 during transport time of the transport appliances 14, 16, 17, 18, are respectively operated by rating operation. |
