Current Setpoint Filter Adaptation - Siemens SINAMICS S120 Function Manual

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Servo control

5.9 Autotuning

Motor hums at very low speeds

If the drive has an encoder with poor resolution, the motor may hum at very low speeds or at

● Increase the actual speed value smoothing (p1441) or reduce the dynamic response

● Set parameter p5271.1 to reduce the controller gains for low speeds.

Poor positioning behavior

Poor positioning behavior is possible when the dynamic response of the drive is relatively low.

The achievable dynamic response depends on the quality and the dimensioning of the

elastomechanical drive train.

Increase the value of parameter p5272 in order to increase the dynamic response of the drive.

The drive may become instable if the values are too high (see, for example, the section "Drive

vibrates" further above).

Current setpoint filter adaptation

The "Current setpoint filter adaptation" function is recommended for systems that display a

variable mechanical resonant frequency during operation. If the system only contains non-

variable mechanical resonant frequencies, they must be suppressed exclusively with fixed

current setpoint filters. (e.g. "One Button Tuning (Page 109)").

Requirements

Make the following settings before you activate the current setpoint filter adaptation:

1. Parameterize the desired current setpoint filter as band-stop filter.

2. Assign the desired current setpoint filter to the adaptation via parameter p5281 (e.g. for filter

4: p5821 = 4).

If the requirements are not met, the fault F07419 "Drive: Current setpoint filter adaptation error"

is output. The fault value indicates which requirement has not been satisfied.

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Drive functions