Siemens SINAMICS S120 Function Manual page 112

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Table of Contents

Servo control

3.9 V/f control

Requirements for V/f control

● First commissioning has been carried out:

● First commissioning has not been carried out:

With synchronous motors, V/f mode is normally only stable at low speeds. Higher speeds

can induce vibrations.

Oscillation damping is activated on the basis of suitable default parameter values and does

not require further parameterization in most applications. If you become aware of

interference caused by a transient response, you have the option of gradually increasing the

value of p1338 and evaluating how this affects your system.

The drive can be ramped up to the current limit (p0640) relatively quickly without the need for

extensive parameterization (when operating the drive with a variable moment of inertia, for

Note the following: Only the ramp-function generator stops when the current limit (p0640) is

reached. This does not prevent the current from increasing even further. In view of this, the

parameters you set must include a safety margin relative to the current limits for the

monitoring functions to prevent the drive from switching off with an overcurrent fault.

The parameters for V/f control have been initialized with appropriate values.

The following relevant motor data must be checked and corrected:

– r0313 Motor pole pair number, actual (or calculated)

– p0314 Motor pole pair number

– p1318 V/f control ramp-up/ramp-down time

– p1319 V/f control voltage at zero frequency

– p1326 V/f control programmable characteristic frequency 4

– p1327 V/f control programmable characteristic voltage 4

– p1338[0...n] V/f mode resonance damping gain

– p1339[0...n] V/f mode resonance damping filter time constant

– p1349[0...n] V/f mode resonance damping maximum frequency

Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3

Drive functions