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88 This is the example showing two machine tools of hydraulic system are remodeled to the Invertor Control System and the other is to the hydraulic unit with accumulator.Invertor Control TypeController (Invertor)When the load changes, the rotational speedof hydraulic pump changes.(The annual electric energy consumption:0.39kW x 16hrs. x 250days = 1,560kWh)Electric PowerTimeThe annual electric expense: JPY 24,900-About 30% reduction of the electricenergy consumption.The annual CO2 reduction amount is333.0 kg-CO2.Hydraulic Unit with Accumulator TypeValve for pressure reliefPressure Switchadditional equipmentsAccumulator(HB-J17.5-LL3-ABC)Intermittent operation of hydraulic pumpThe annual electric expense: JPY 1,600-(The annual electric energy consumption:0.025kW×16hrs.×250days = 100kWh)Room Temp.:29.3℃ Oil Temp.:29.6℃There is not much oil temperature rise.About 95% reduction of the electricenergy consumption.The annual CO2 reduction amount is1,121.1 kg-CO2.Electric PowerTimePrevious Hydraulic Circuit assembling Constant Displacement PumpHydraulic PumpCheck ValveSwitching ValveHydraulicCylinderfor ClampEven though the load changes, the rotational speed of hydraulic pump is constant.Electric PowerTimeThe annual electric expense: JPY 34,600-(The annual electric energy consumption:0.54kW×16hrs.×250days = 2,160kWh)Machine Tool APrevious Hydraulic Circuit assembling Constant Displacement PumpHydraulic PumpCheck ValveSwitching ValveHydraulicCylinderfor ClampEven though the load changes, the rotational speed of hydraulic pump is constant.Electric PowerTimeThe annual electric expense: JPY 33,900-(The annual electric energy consumption:0.53kW×16hrs.×250days = 2,120kWh)Room Temp.:28.3℃ Oil Temp.:45.3℃Machine Tool BHydraulic Unit of Deep Hole Boring Machine Remodeling Example for Energy Saving

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