Speed Setpoint Filter - Siemens SINAMICS S120 Function Manual

3.1.2

Speed setpoint filter

The two speed setpoint filters are identical in structure and can be used as follows:
S Band-stop
S Low-pass 1st order (PT1) or
S Low-pass 2nd order (PT2)
Both filters are activated via parameter p1414.x. Parameters p1415 and p1421 are
used to select the filter elements.
Band- -stop
Numerator natural freq. Numerator damping
fn_n
pxxxx
|y|
fs
f_B
2nd order filter
pxxxx
fn_n
Denominator natural freq.
Denominator damping
Fig. 3-2 Filter overview for speed setpoint filters
Parameter overview for speed setpoint filter (see List Manual)
Adjustable parameters
S p1414[D]
S p1415[D]
S p1416[D]
S p1417[D]
S p1418[D]
S p1419[D]
S p1420[D]
S p1421[D]
S p1422[D]
S p1423[D]
S p1424[D]
S p1425[D]
S p1426[D]
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition
Low pass PT1
pxxxx
D_z
pxxxx
y
y
f
1st order delay
order
pxxxx = time constant
pxxxx
D_n
Speed setpoint filter activation
Speed setpoint filter 1 type
Speed setpoint filter 1 time constant
Speed setpoint filter 1 denominator natural frequency
Speed setpoint filter 1 denominator damping
Speed setpoint filter 1 numerator natural frequency
Speed setpoint filter 1 numerator damping
Speed setpoint filter 2 type
Speed setpoint filter 2 time constant
Speed setpoint filter 2 denominator natural frequency
Speed setpoint filter 2 denominator damping
Speed setpoint filter 2 numerator natural frequency
Speed setpoint filter 2 numerator damping
Low pass PT2
Denominator natural freq.
fn_n
pxxxx
|y|
t
x
fn
Operating Modes
Servo control
Denominator damping
D_n
pxxxx
D
y
f
3-65