Operating Instruction - Frequency Inverter 230V / 400V ... - opis.cz

13.8 Percentage Value RampsThe percentage value ramps scale the change of the reference value (in percent) forthe corresponding input function. The acceleration and deceleration of the drive areparameterized via the frequency ramps.The behavior Gradient Percentage Ramp 477 corresponds to a function which takesthe time response of the drive system into account. If the parameter is set to 0 %/s,this function is deactivated and a direct reference value modification for the followingfunction is obtained.The default value depends on the parameter Configuration 30.ParameterSettingsNo. Description Min. Max. Fact. sett.477 Gradient Percentage Ramp 0 %/s 60.000 %/s x %/s13.9 Block FrequenciesIn certain applications, it is necessary to fade out reference frequencies. In this way,resonance points of the system as stationary operating points are avoided. The parameters1st Blocking Frequency 447 and 2nd Blocking Frequency 448 with theparameter Frequency Hysteresis 449 define two resonance points.A block frequency is active if the parameter values of the block frequency and thefrequency hysteresis are not equal to 0.00 Hz.The area faded out as a stationary working point by the hysteresis is passed throughas quickly as possible according to the selected ramp for V. If the output frequency islimited as a result of the selected control parameter settings, e.g. if the current limit isreached, the hysteresis is passed through with a delay. The behavior of the referencevalue can be determined from its direction of movement according to the followingdiagram.ParameterSettingsNo. Description Min. Max. Fact. sett.447 1st Blocking Frequency 0.00 Hz 999.99 Hz 0.00 Hz448 2nd Blocking Frequency 0.00 Hz 999.99 Hz 0.00 Hz449 Frequency Hysteresis 0.00 Hz 100.00 Hz 0.00 Hzreference value outputhysteresis hysteresisfblock-hysteresisf blockfblock+hysteresisinternalreference value02/06 111