Method for determining the load capacity of cranes

A method for determining the admissible load capacity of a crane, comprising:

• determining the load capacity in dependence on at least one first and one second parameter and where the determination of the load capacity is performed by calculation by a connection described by formulae between the load capacity and the parameters,
• wherein the first and second parameters are parameters which influence the admissible load capacity of the crane,
• wherein the determination of the load capacity is performed by a unit of the crane,
• wherein the admissible load capacity of the crane is a load capacity that is safe in operation,
• wherein values of the parameters are detected by a sensor, and when a parameter value exceeds a limit, another parameter value which provides a lower load capacity is used in determining the admissible load capacity, instead of the parameter value detected by the sensor.

A method for determining the admissible load capacity of a crane at a given value of a first parameter and a given value of a second parameter, wherein the load capacity is dependent upon said first and second parameters, and the load capacity is known for at least two values of the first parameter and at least two values of the second parameter, the method comprising:

• determining at least a first and second load capacity of the crane at the given value of the first parameter by calculation or by interpolation or extrapolation on the basis of the known values of the load capacity at the first and second values of the second parameter and the first and second values of the first parameter;
• and
• determining a third load capacity of the crane at the given value of the second parameter and the given value of the first parameter by calculation or by interpolation or extrapolation on the basis of the first and second load capacities at the given value of the first parameter and the first and second values of the second parameter,
• wherein said determination of the first, second, and third load capacities is performed by a unit of the crane to determine the admissible load capacity of the crane, and
• wherein the given values of the first and second parameters are detected by a sensor, and when a given parameter value exceeds a limit, another parameter value which provides a lower load capacity is used in determining the admissible load capacity, instead of the given parameter value detected by the sensor.