14 Measures to ensure efficient use of energy14.1 Sleep mode:Sleep mode means the scheduled switch-off of the machine in the event of a relatively long standstill (machine not in use). Sleep mode is one part of an energy-saving concept.Sleep mode can be set to be time-controlled, and to be controlled by sensors/the control system (e.g. no workpiece on the run-in / run-out belt) or by an external signal. The machines are switched off after end of cycle in the necessary order, taking any (adjustable) overtravel times into account.The following items of equipment, listed by way of illustration, are to be switched off, provided this is possible without impairing machine and safety functions:• Drive units and their (forced) air-cooling devices• Spindle motors• Hydraulic fluid supply system• Power electronics• Cooling lubricants and high-pressure systems• Conveyor belts, floating chain conveyors, loading conveyor belts• Compressed air supply, but not control air• The machine’s decentralized air extraction equipment• Process-oriented controllers• RobotsInstructions regarding execution:1) Switch-off, triggered by an external signal, occurs only after a parameterizable overtravel time, default setting: 2 minutes. The external signal that is pending is to be indicated on the control panel.2) Conveyor belts, floating chain conveyors, and loading conveyor belts are to be switched off, in addition, after a parameterizable overtravel time and provided no feed or removal function is activated.3) In the event of machine faults and malfunctions relating to flow of materials, the cooling lubricant is to be switched off in all cases.4) If warming-up phases should be necessary for operating the machine, an appropriate concept is to be agreed with the Customer department concerned.5) Sleep mode is to be triggered externally via a voltageless contact or a bus interface.6) A voltageless contact or a bus interface to a higher-level system is to be provided to signal the implementation of sleep mode. Sleep mode, as a mode of operation, is to be signalled on the main control panel.7) Arrangements for automatic start-up of the machine when sleep mode is terminated are to be made with the Customer department concerned.