Energy saving apparatus for multi-axis system complex machine tool

An apparatus for realizing energy savings of a multi-axis system complex machine tool, the apparatus comprising:

• a CNC control device 10, when executing a complex processing a workpiece, configured to constitute a plurality of processing condition groups that are a set of at least one axis units depending on whether the axis units can be used simultaneously without conflicts between the axis units according to processing conditions of the workpiece, recognize a specific processing condition group out of the plurality of processing condition groups in response to execution of the machining program, and transmit a processing condition group signal;
• and
• a power supply device 20 including a driver module unit 40 having a plurality of driver modules that drive an axis unit corresponding to the at least one processing condition group signal, and a relay unit 30 having a plurality of relays installed in numbers corresponding to the plurality of driver modules and to apply a standby power to the driver module that drives the axis unit of the processing condition group in response to the processing condition group signal.