Additional data for calculating the rise time and the peak line-to-line voltageIf you need to calculate the actual peak voltage and voltage rise time considering the actualcable length, proceed as follows:• Peak line-to line voltage: Read the relative ÛLL/UN value from the diagram below andmultiply it by the nominal supply voltage (UN).• Voltage rise time: Read the relative values ÛLL/UN and (du/dt)/UN from the diagrambelow. Multiply the values by the nominal supply voltage (UN) and substitute into equationt = 0.8 · ÛLL/(du/dt).The peak voltage and voltage change rate are shown below.100 200 3000.00.51.01.52.02.53.0l (m)du/dtUN-------------(1/Ps)ÛLL /UNMotor cable lengthIRelative peak line-to-line voltageÛLL/UNRelative du/dt value(du/dt)/UNNote:ÛLL and du/dt values are approximately 20% higher during the resistor braking.Additional note for sine filtersA sine filter also protects the motor insulation system. The peak phase-to-phase voltagewith a sine filter is approximately 1.5 · UN.Sine filter is available as an option (+E206).Guidelines for planning the electrical installation 81
