Setting up Compax3 Positioning via digital I/Os204 192-120101 N11 C3I11T11 November 20074.4.9.6 Measurement of frequency responsesIn this chapter you can read about:Safety instructions concerning the frequency response measurement ...........................................204Functionality of the measurement....................................................................................................204Open/Closed Loop frequency response measurement ...................................................................206Excitation Signal ..............................................................................................................................207Non-linearities and their effects .......................................................................................................208Please note that you require a licence hey (see page 196, see page 194) forthis application!Safety instructions concerning the frequency response measurementDuring the measurement of the frequency response, the control is changed andinfluenced in multiple ways. You should therefore respect the following notes: During the measurement, the entire system is excited via a broad frequencyspectrum. This might damage especially sensitive components (such as lenses)The risk increases with the extent of the excitation. In addition, naturalmechanical frequencies may cause an increased excitation of individualcomponents. The measurement of the frequency response can only be made in the setupmode with energized controller. During the current measurement (between start and stop of the measurement),no write flash may be executed. In the event of a break in communication during the measurement, the controllermust be switched off and then on again in order to reestablish the original status. Changes of the controller parameters during the measurement are not permitted.Those may be overwritten by standard values when the measurement isterminated.Functionality of the measurementBasic structure of a frequency response measurementSystem SG(S)InputEingangsSignal u(t)OutputAusgangsSignal y(t)SignalGeneratorSignal ProcessingSignalauswertungAmplitude spectrumAplitudenspektrumPhase spectrumPhasenspektrumV(f)ϕ(f)SuperimposedüberlagertesSystem+open/closedLoopC3 Software-OscilloscopeUpload
