Grid-powered material handling and/or construction machine

1 . A material handling and/or construction machine, wherein the machine comprises:

a plurality of electric drives for driving work assemblies and/or structural components of the material handling and/or construction machine;

a control apparatus for controlling the plurality of electric drives;

a power supply device for supplying the electric drives with electric power, wherein the power supply device has a grid connection for connection to a power grid and drawing of the electric power from the power grid;

wherein a measuring device for measuring a total electric power consumption of the material handling and/or construction machine from the power grid is provided at the grid connection; and

wherein the control apparatus is configured to:

compare the total electric power consumption measured with a maximum power available from the power grid and/or a limit value dependent thereon and to reduce and limit the power consumption of said plurality of electric drives in dependence on the comparing;

to scale control commands entered by a machine operator and/or generated by a machine control module for controlling the electric drives in dependence on the comparing and to limit them to a reduced maximum value; and

to provide different power-reducing measures for different ones of said electric drives, and to provide a greater power reduction for an electric drive that has a high power consumption and a lower power reduction for another electric drive that has a comparatively lower power consumption.

2 . The material handling and/or construction machine according to claim 1 , wherein the control apparatus is configured to reduce one or more driving speeds of one or more electric drives and to override a driving speed command indicating a desired driving speed.

3 . The material handling and/or construction machine according to claim 1 , wherein the control apparatus is configured to reduce one or more driving speeds of one or more electric drives and to override a driving speed command indicating a desired driving speed.

4 . The material handling and/or construction machine according to claim 1 , wherein the control apparatus is configured to switch on an energy supply storage unit in dependence on said comparing and/or to increase the power withdrawal from the energy supply storage unit for supplying the electric drives when the total power consumption of the material handling and/or construction machine reaches the maximum available power of the power grid or the limit value derived therefrom or a predetermined fraction thereof.

5 . The material handling and/or construction machine of claim 1 , wherein the control apparatus has an input interface for inputting a maximum available power of the power grid to be connected.

6 . The material handling and/or construction machine of claim 1 , wherein material handling/construction machine is a lifting gear or a crane.

7 . A material handling and/or construction machine, wherein the machine comprises:

a circuit breaker at a machine-end grid connection, wherein the circuit breaker is matched to a respective power grid to be connected, via which a total power consumption of the material handling and/or construction machine drawn from the power grid runs, wherein the circuit breaker comprises a universal current sensitive error current circuit breaker.

8 . The material handling and/or construction machine of claim 7 , wherein the universal current sensitive error current breaker is configured to have multiple poles and is connected to cores of a grid supply line of the material handling and/or construction machine.

9 . The material handling machine and/or construction machine of claim 8 , wherein the circuit breaker has a rated residual current, wherein the circuit breaker is adjustable with respect to the rated residual current, and wherein the circuit breaker is configured to switch off upon reaching the rated residual current.

10 . The material handling machine and/or construction machine of claim 7 , wherein the circuit breaker has a rated residual current, wherein the circuit breaker is adjustable with respect to the rated residual current, and wherein the circuit breaker is configured to switch off upon reaching the rated residual current.

11 . The material handling machine and/or construction machine of claim 7 , wherein the circuit breaker has a rated residual current, wherein the circuit breaker is adjustable with respect to the rated residual current, and wherein the circuit breaker is configured to switch off upon reaching the rated residual current.