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Entry type: FAQ Entry ID: 109780402, Entry date: 06/15/2020
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SINAMICS V20: Why does the speed fluctuate when I set the setpoint via an analog input.

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If you give the setpount via an analog input to the inverter, the setpoint rounding (P1130 to P1133) can only be used.

If you have set rounding times (in P1130 to P1133) in the SINAMICS V20 and specify the speed setpoint via an analog input, the speed will fluctuate constantly between the specified value and the max frequency as soon as you give the ON command.

The description of the parameter P1130 in the SINAMICS V20 operating instructions (see entry ID 109773836 ) also contains a corresponding note:

Rounding times are not recommended when analog inputs are used, since they would result in overshoot/undershoot in the converter response.

Remedy
Do not use the rounding by setting P1130 to P1133 to 0.00. (preferred solution).
If you need a rounding (P1130 to P1133 not equal to 0), then use the discontinuous smoothing by setting P1134 to 1.

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