Optimized operation of a machine having a plurality of drives

A control program for a control facility controlling a machine having a plurality of first drives, wherein the control program is embodied in a non-transitory computer-readable medium and comprises machine code which, when loaded into a processor of the control facility and executed by the processor, causes the control facility to operate the machine by

• monitoring a power demand of the machine from a feed facility supplying at least the first drives with electrical energy,
• when the power demand exceeds an upper switch-over value, switching the machine over from a normal operation to a special operation, and when the power demand falls below a lower switch-over value, switching the machine over from the special operation to the normal operation,
• determining cyclically, both in normal operation and also in special operation, for each of the first drives a preliminary first current setpoint value based on a first basic setpoint value of a respective first drive that is valid for the respective cycle,
• controlling, both in normal operation and also in special operation, the preliminary first current setpoint values such that an operating state of the respective first drive approximates substantially the first basic setpoint value,
• controlling, both in normal operation and also in special operation, the first drives according to a preliminary first current setpoint value, which in normal operation is identical to the preliminary first current setpoint value,
• in special operation
• determining a total power available for all first drives,
• dynamically determining for each of the first drives a respective proportionality factor by evaluating current setpoint operating states and/or actual operating states of the first drives and taking into consideration the preliminary first current setpoint values, and
• determining the resulting first current setpoint values by modifying the preliminary first current setpoint values such that each of the respective first drives draws no more than a power level that is the product of the respective proportionality factor and the available total power,
• supplying to a drive controller that has a control characteristic with an integral control component, in particular P1 controller, for each of the first drives the respective first basic setpoint value and a respective corresponding first basic actual value and determining therefrom the respective preliminary first current setpoint value.

A control facility for a machine that has a plurality of first drives, wherein the control facility has a microprocessor and is programmed with a control program embodied in a non-transitory computer-readable medium and comprises machine code which, when loaded into the microprocessor and executed by the microprocessor, causes the control facility to operate the machine by

• monitoring a power demand of the machine from a feed facility supplying at least the first drives with electrical energy,
• when the power demand exceeds an upper switch-over value, switching the machine over from a normal operation to a special operation, and when the power demand falls below a lower switch-over value, switching the machine over from the special operation to the normal operation,
• determining cyclically, both in normal operation and also in special operation, for each of the first drives a preliminary first current setpoint value based on a first basic setpoint value of a respective first drive that is valid for the respective cycle,
• controlling, both in normal operation and also in special operation, the preliminary first current setpoint values such that an operating state of the respective first drive approximates substantially the first basic setpoint value,
• controlling, both in normal operation and also in special operation, the first drives according to a preliminary first current setpoint value, which in normal operation is identical to the preliminary first current setpoint value,
• in special operation
• determining a total power available for all first drives,
• dynamically determining for each of the first drives a respective proportionality factor by evaluating current setpoint operating states and/or actual operating states of the first drives and taking into consideration the preliminary first current setpoint values, and
• determining the resulting first current setpoint values by modifying the preliminary first current setpoint values such that each of the respective first drives draws no more than a power level that is the product of the respective proportionality factor and the available total power,
• supplying to a drive controller that has a control characteristic with an integral control component, in particular P1 controller, for each of the first drives the respective first basic setpoint value and a respective corresponding first basic actual value and determining therefrom the respective preliminary first current setpoint value.

A machine, comprising:

• a plurality of first drives;
• a feed facility supplying at least the first drives with electrical energy;
• and
• a control facility which controls the first drives by
• monitoring a power demand of the machine from a feed facility supplying at least the first drives with electrical energy,
• when the power demand exceeds an upper switch-over value, switching the machine over from a normal operation to a special operation, and when the power demand falls below a lower switch-over value, switching the machine over from the special operation to the normal operation,
• determining cyclically, both in normal operation and also in special operation, for each of the first drives a preliminary first current setpoint value based on a first basic setpoint value of a respective first drive that is valid for the respective cycle,
• controlling, both in normal operation and also in special operation, the preliminary first current setpoint values such that an operating state of the respective first drive approximates substantially the first basic setpoint value,
• controlling, both in normal operation and also in special operation, the first drives according to a preliminary first current setpoint value, which in normal operation is identical to the preliminary first current setpoint value,
• in special operation
• determining a total power available for all first drives,
• dynamically determining for each of the first drives a respective proportionality factor by evaluating current setpoint operating states and/or actual operating states of the first drives and taking into consideration the preliminary first current setpoint values, and
• determining the resulting first current setpoint values by modifying the preliminary first current setpoint values such that each of the respective first drives draws no more than a power level that is the product of the respective proportionality factor and the available total power,
• supplying to a drive controller that has a control characteristic with an integral control component, in particular P1 controller, for each of the first drives the respective first basic setpoint value and a respective corresponding first basic actual value and determining therefrom the respective preliminary first current setpoint value.