Program features 63The standstill modes (Standstill 1, Standstill 2) can be used if the motor cannot beturned (for example, when the load is connected). As the characteristics of motorsand loads differ, testing must be done to find out the most suitable standstill mode.The drive is capable of determining the rotor position when started into a runningmotor in open-loop or closed-loop control. In this situation, the setting of 21.13Autophasing mode has no effect.The autophasing routine can fail and therefore it is recommended to perform theroutine several times and check the value of parameter 98.15 Position offset user.An autophasing fault (3385 Autophasing) can occur with a running motor if theestimated angle of the motor differs too much from the measured angle. This couldbe caused by, for example, the following:• The encoder is slipping on the motor shaft• An incorrect value has been entered into 98.15 Position offset user• The motor is already turning before the autophasing routine is started• Turning mode is selected in 21.13 Autophasing mode but the motor shaft islocked• Turning with Z-pulse mode is selected in 21.13 Autophasing mode but no zeropulse is detected within a revolution of the motor• The wrong motor type is selected in 99.03 Motor type• Motor ID run has failed.SettingsParameters 21.13 Autophasing mode (page 203), 98.15 Position offset user (page407) and 99.13 ID run requested (page 410). Flux brakingThe drive can provide greater deceleration by raising the level of magnetization in themotor. By increasing the motor flux, the energy generated by the motor duringbraking can be converted to motor thermal energy.TBrTN204060(%)MotorspeedNo flux brakingFlux brakingTBr = Braking torqueTN = 100 NmFlux brakingNo flux brakingt (s) f (Hz)
