12 Functional Descriptions 08.96
12.33.5 Speed setpoint filter
12.33.5 Speed setpoint filter
Speed setpoint filters are used to dampen mechanical resonant frequencies in the position
control loop. Bandstops and low passes (PT2/PT1) can both be used as speed setpoint filters.
The tasks of the filter are as follows:
• Adapt the position controller to machinery to be controlled (e.g. table resonance)
• Symmetrize different axis dynamic responses in the case of interpolating axes.
Note
The frequency response analysis of the speed controller includes the filters.
The structure of the position control loop must be taken into account when the speed setpoint
filter is dimensioned.
• Position control to direct measuring system, i.e. load resonance directly in control loop.
• Position control to motor measuring system, i.e. load resonance only indirectly via motor to
control loop.
12.33.5.1 Machine data
MD 1500: Number of speed setpoint filters
MD 1501: Type of speed setpoint filter
MD 1502: Time constant speed setpoint filter 1
MD 1503: Time constant speed setpoint filter 2
MD 1506: Natural frequency speed setpoint filter 1
MD 1507: Damping speed setpoint filter 1
MD 1508: Natural frequency speed setpoint filter 2
MD 1509: Damping speed setpoint filter 2
MD 1514: Blocking frequency speed setpoint filter 1
MD 1515: Bandwidth speed setpoint filter 1
MD 1516: Bandwidth counter speed setpoint filter 1
MD 1517: Type speed setpoint filter
MD 1518: Bandwidth speed setpoint filter 2
MD 1519: Bandwidth counter speed setpoint filter 2
MD 1520: Natural frequency bandstop speed setpoint filter 1
MD 1521: Natural frequency bandstop speed setpoint filter 2
MD 1501: Type speed setpoint filter
0 Low pass (see MD 1502/1506/1507)
1 Bandstop (see MD 1514/1515/1516)
0 Low pass (see MD 1502/1508/1509)
1 Bandstop (see MD 1517/1518/1519)
0 PT2 low pass (see MD 1506/1507)
1 PT1 low pass (see MD 1502)
0 PT2 low pass (see MD 1508/1509)
1 PT1 low pass (see MD 1503)
1st filter
2nd filter
1st filter
2nd filter
Low pass/
bandstop
Bit 0
Bit 1
Bit 8
Bit 9
PT2/PT1
with low
pass
12–348
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SINUMERIK 840C (IA)