Siemens SINUMERIK 840C User Manual
Page 1115
12 Functional Descriptions
08.96
12.33.3 Current setpoint filter
Possible filter combinations
Filter 4
Filter 3
Filter 2
Filter 1
MD 1201
PT2
PT2
PT2
PT2 = 0
0000
PT2
PT2
PT2
BS = 1
0001
PT2
PT2
BS
PT2
0010
PT2
PT2
BS
BS
0011
PT2
BS
PT2
PT2
0100
PT2
BS
PT2
BS
0101
PT2
BS
BS
PT2
0110
PT2
BS
BS
BS
0111
BS
PT2
PT2
PT2
1000
BS
PT2
PT2
BS
1001
BS
PT2
BS
PT2
1010
BS
PT2
BS
BS
1011
BS
BS
PT2
PT2
1101
BS
BS
PT2
BS
1101
BS
BS
BS
PT2
1110
BS
BS
BS
BS
1111
Note
Filter 1 is configured as a low-pass filter as standard.
12.33.3.2
Scope of application of low pass as current setpoint filter
Low-pass filters must be dimensioned such that resonance is kept reliably low while the filter
effect on the fundamental frequency range is minimized.
Filter in the case of resonance in the fundamental frequency range
Resonance in the fundamental frequency range can normally be restricted by means of control
parameters.
Note
Smoothing filters have a negative phase rotation (low-pass generally, bandstop for f < fs, fs
= blocking frequency). This phase rotation can reduce the stability margin of the fundamental
frequency range.
When a filter is used, therefore, the objective must be to obtain the optimum from
•
desired damping action and
•
minimum possible filter effects on the fundamental frequency range.
12–340
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SINUMERIK 840C (IA)