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

16.5.4 Acceleration Pre-ControlThe acceleration pre-control is active in the speed-controlled configurations and canbe activated via parameter Operation Mode 725 for acceleration pre-control.Operation modeFunction0 - Off The control system is not influenced.1 - Switched onThe acceleration pre-control is active according tothe limit values.The acceleration pre-control controlled parallel to the speed controller reduces thereaction time of the drive system to a change of reference values. The minimum accelerationtime defines the modification speed of the reference speed value as fromwhich a torque necessary for acceleration of the drive is pre-controlled. The accelerationof the mass is a function of the Mech. Time Constant 727 of the system. Thevalue calculated from the increase of the reference value and the multiplication factorof the torque required is added to the output signal of the speed controller.ParameterSettingsNo. Description Min. Max. Fact. sett.726 Minimum Acceleration 0.1 Hz/s 6500.0 Hz/s 1.0 Hz/s727 Mech. Time Constant 1 ms 60000 ms 10 msFor optimal setting, the acceleration pre-control is switched on and the mechanicaltime constant is set to the minimum value. The output value of the speed controller iscompared to the minimum acceleration time during the acceleration processes. Thefrequency ramp is to be set to the highest value occurring in operation at which theoutput value of the speed controller is not yet limited. Now, the value of the MinimumAcceleration 726 is set to half the set acceleration ramp so that it is ensured that theacceleration pre-control is active. The acceleration pre-control is not raised by increasingthe Mech. Time Constant 727 until the output values corresponds to the timemodification of the drive during the acceleration processes.16.5.5 Field ControllerThe flux-forming current component is controlled by the field controller. The guidedcommissioning optimizes the parameters of the field controller by measuring the timeconstant and magnetizing curve of the connected 3-phase machine. The parametersof the field controller are selected such that they can be used without changes in mostapplications. The proportional and the integrating part of the field controller are to beset via parameters Amplification 741 and Integral Time 742.ParameterSettingsNo. Description Min. Max. Fact. sett.717 Reference Flux 0.01 % 300.00 % 100.00 %741 Amplification 0.0 100.0 5.0742 Integral Time 0.0 ms 1000.0 ms 100.0 ms158 02/06