V/F Control For Diagnostics - Siemens Sinamics S110 Function Manual

7.1.9

V/f control for diagnostics

Description
With V/f control, the motor is operated with an open control loop and does require speed
control or actual current sensing, for example. Operation is possible with a small amount of
motor data.
V/f control can be used to check the following:
● Motor Module
● Power cable between the Motor Module and motor
● Motor
● DRIVE-CLiQ cable between the Motor Module and Motor
● Encoder and actual encoder value
The following motors can be operated with V/f control:
● Induction motors
● Synchronous motors
Drive functions
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
CAUTION
V/f control must only be used as a diagnostic function (e.g. to check that the motor
encoder is functioning correctly).
Note
In V/f mode, the calculated actual speed value is always displayed in r0063. The speed of
the encoder (if installed) is displayed in r0061. If an encoder is not installed, r0061
displays "0".
Note
The operation of synchronous motors with V/f control is allowed only at up to 25 % of the
rated motor speed.
Drive functions
7.1 Servo control
139