Skip Frequency Bands And Minimum Speed; Signal Flow Diagram - Siemens SINAMICS S150 NEMA Operating Instructions Manual

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Setpoint channel and closed-loop control

7.2 Setpoint channel

Skip frequency bands and minimum speed

In the case of variable-speed drives, it is possible for the control range of the overall drive

train to contain bending-critical speeds that the drive must not be be operated at or the

vicinity of in steady-state condition. In other words, although the drive can pass through this

range, it must not remain within it because resonant oscillations may be excited. The skip

frequency bands allow this range to be blocked for steady-state operation. Because the

points at which critical whirling speeds occur in a drive train can vary depending on age or

thermal factors, a broader control range must be blocked. To prevent constant speed step

changes in the vicinity of these skip frequency bands (speeds), they are provided with a

The skip speed values apply in the positive and negative directions of rotation.

Specifying a minimum speed allows a specific range to be disabled around speed 0 rpm for

steady-state operation.

Function diagram

Signal flow diagram: Skip frequency bands and minimum speed

Skip frequency bands and speed limiting

Operating Instructions, 12/2018, A5E36652151A

Enclosed Drives