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General Information |
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Type |
R/W Parameter |
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Description |
Sets the Q of the zero (numerator) of anti-resonance filter #1; active in opmodes 1 (velocity) and 2 (position) only. |
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Units |
N/A |
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Range |
0.1 to 5 |
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Default Value |
0.5 |
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Data Type |
Float |
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See Also |
VL.ARPF1 TO VL.ARPF4 on pg. 1, VL.ARPQ1 TO VL.ARPQ4 on pg. 1, VL.ARZF1 TO VL.ARZF4 on pg. 1 |
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Start Version |
M_01-02-00-000 |
| FieldbusA Fieldbus is an industrial network system for real-time distributed control (e.g. CAN or Profibus). It is a way of connecting instruments in a plant design | Index/Subindex | Object Start Version | |
|---|---|---|---|
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3406h/D |
M_01-02-00-000 | ||
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3406h/F |
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Description
VL.ARZQ1 sets the Q (quality factor) of the zero (numerator) of AR filter 1. This value is QZ in the approximate transfer function of the filter:
AR1(s) = [s²/(2πFZ)²+s/(QZ2πFZ) + 1]/ [s²/(2πFP)² +s/(QP2πFP) + 1]
The following block diagram describes the AR filter function; note that AR1 and AR2 are in the forward path, while AR3 and AR4 are applied to feedback:
AR1, AR2, AR3 and AR4 are used in velocity and position mode, but are disabled in torqueTorque is the tendency of a force to rotate an object about an axis. Just as a force is a push or a pull, a torque can be thought of as a twist mode.
Discrete time transfer function (applies to all AR filters)
The velocity loop compensation is actually implemented as a digital discrete time system function on the DSP. The continuous time transfer function is converted to the discrete time domain by a backward Euler mapping:
s ≈ (1-z-1)/t, where t = 62.5 µs.
The poles are prewarped to FP and the zeros are prewarped to FZ.
Related Topics
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