Functions, monitoring, and protective functions9.2 Drive functionsInverter chassis unitsOperating Instructions, 07/2016, A5E00331449A 397occurs. Once the frequency has been found, the motor is magnetized. The output voltageduring the magnetization time (p0346) is increased to the voltage value yielded from theV/f characteristic (see "Flying restart").● Vector control without encoder:The motor speed is determined using the speed adaptation control loop for the electricmotor model. To begin with, the search current (p1202) is injected and then the controlleris activated starting from the maximum search frequency. The dynamic response of thecontroller can be altered using the search speed factor (p1203). If the deviation of thespeed adaptation controller is not too great, the motor continues to be magnetized for theduration parameterized in p0346.Once the excitation build-up time (p0346) has elapsed, the ramp-function generator is set tothe actual speed value and the motor ramped up to the current setpoint frequency.Figure 9-6 Flying restartWARNINGDanger to life as a result of unexpected motor movement when activating flying restartWhen the flying restart (p1200) function is active, the drive may still be accelerated by thesearch current despite the fact that it is at standstill and the setpoint is 0!For this reason, death, serious injury, or considerable material damage can occur ifpersonnel enter the working area of a motor in this state.• Observe the general safety instructions.• Ensure that the EMERGENCY STOP functions are always fully functional.NoteFlying restart without encoder for permanently-excited synchronous motorsThe flying restart without encoder for permanently-excited synchronous motors is possibleonly when a VSM10 Voltage Sensing Module is used to acquire the motor speed.
