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77Comparison of Electric Energy Consumption and CO2 ReductionAmount by "Energy Saving Evaluate Comparison Machine"Unit with AccumulatorInvertor Control UnitAnnual Electric ExpenseSaving of JPY 8,586Unit with AccumulatorInvertor Control UnitAnnual CO2 Exhaust AmoutReduction of 297.8kgElectric Energy Consumption per hour (Wh)96.76311.42Energy saving ratio of unit with accumulator68.9%ーAnnual electric expense: 10 hours, 250 days operation (Yen)3,87012,457Annual cost down amount (Yen)8,586ー* Calculated by 10 hours, 250 days operation and 1kWh = JPY 16-.* You are able to get more cost down by the unit with accumulator compared with the unit with others except invertor control.It might be necessary to instal the cooler to the unit with accumulator depending on the using environment, but the cooler can be smaller than the invertor control unit's ones.2327.62334.3Room TemperatureBefore Operation(℃)2343.5After 8 hours Operation(℃) In case of using accumulator, the oil temperature rise is controlled as below and it became unnecessary to use "the coller". NACOL manufactured the Energy Saving Comparison Machine which operates the hydraulic chuck and tool-post modeling the machine tool. And we did the energy saving evaluate comparison examination between "Unit with Accumulator" and "Invertor Control Unit".TemperatureElectric Energy Consumption ( Unit with ACC.)Fluid Temperature ( Unit with ACC.)Electric Energy Consumption ( Invertor Control Unit.)Fluid Temperature ( Invertor Control Unit.)Room TemperatureElectric Energy ConsumptionTime Even if the electric power failure happens in case of using accumulator, it can make to keep the clutches of chuck for fi xed time. So there is no fall of work and/or move and it becomes safe. It should be most suitable to the area where could happen the electric power failure often.NOTE) In case of considering the countermeasure of electric power failure, it should be necessary to calculate the accumulator volume for the countermeasure of electric power failure.・If the customer would like to select the accumulator and/or calculate the energy saving ratio, please inform the operating condition of 1 cycle of actuator, the specifi cation of hydraulic pump and electric motor to our sales department.・The accumulator is not only for the saving energy, but also for pulsation dampening of fl uid, ease of pipe vibration by pulsation, shock dampening and ease of pressure change by temperature change.68.9%134.3kg-CO2CO2 Exhaust Amount Reduction Ratio:1- ①/②①Unit with Accumulator②Invertor Control Unit432.1kg-CO2*Calculated by 0.555kg-CO2/kWh1. Measurement Result Graph2. Comparison of "Energy Consumption Eff ectiveness"3. Calculated CO2 exhaust Amount by 10 hours a day and 250 days annual operation4. Oil Temperature RiseUnit with AccumulatorInvertor Control Unit5. Countermeasure of Electrical Power FailureThe points of energy saving are "stop the electric motor" and "effective use of discharge amount from hydraulic pump!"The unit with accumulator which can "stop the electric motor" can do the large amount of energy saving and cost down compared with the invertor control unit which can only reduce the electric motor rotational speed!Unit withAccumulatorInvertor Control UnitElectric Energy ConsumptionDown

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