SINAMICS S120 Functi.. - Gregbotos.com

Operating ModesServo control3.1.9 V/f Control for diagnosticsDescriptionWith V/f control, the motor is operated with an open control loop and does requirespeed control or actual current sensing, for example. Operation is possible with asmall amount of motor data.V/f control can be used to check the following: Motor Module Power cable between the Motor Module motor Motor DRIVE-CLiQ cable between the Motor Module motor Encoder and actual encoder valueThe following motors can be operated with V/f control:Induction motorsSynchronous motorsCautionV/f control must only be used as a diagnostic function(e.g. to check that the motor encoder is functioning correctly).NoteIn V/f mode, the calculated actual speed value is always displayed in r0063. Thespeed of the encoder (if installed) is displayed in r0061. If an encoder is notinstalled, r0061 displays “0”.NoteThe operation of synchronous motors with V/f control is allowed only at up to 25 %of the rated motor speed.© Siemens AG 2006 All Rights ReservedSINAMICS S120 Function Manual, 03/2006 Edition3-91