Siemens SINUMERIK 840C - Manual (Page 544)

07.97 7 Drive Machine Data (SIMODRIVE Drive MD)
7.3.2 Drive MD (data description)
Note:
The maximum block frequency input value is limited by the sampling frequency of the servo
control (MD 1001) (parameterization error).
MD 1514 <
2 x T
sampl. speed controller
1
T
sampl.
(MD 1001)
62.5 µ s
125.0 µ s
MD 1514
8000 Hz
4000 Hz
= MD 1001 [ s ]
Bandwidth speed setpoint filter 1 1515
Default value Lower input limit Upper input limit Units
500.0 5.0 7 999.0 Hz
Active
at once
Input of -3dB bandwidth for speed setpoint filter 1 (band-stop). The filter is activated in
machine data MD 1500 (No. speed setpoint filters) and MD 1501 (Type speed setpoint filter).
Note:
When 0 is entered for the bandwidth, the filter is parameterized as a proportional element with
a gain of 1.
Numerator bandwidth speed setpoint filter 1 1516
Default value Lower input limit Upper input limit Units
0.0 0.0 7 999.0 Hz
Active
at once
Input of numerator bandwidth for the damped band-stop.
The ratio of the bandwidth numerator to the bandwidth denominator determines the drop in the
amplitude response at the blocking frequency. If fbz < fbn, the amplitude drops and if fbz >
fbn the amplitude rises. The latter case is unrealistic because it would cause an excessive
frequency response and therefore overshooting in the controller.
If fbz=fbn, the amplitude remains constant over the entire frequency range.
Formula:
1+s · (2 · · fbz/(2 · · fz) 2 )+s 2 · (1/(2 · · fz) 2 ) 1 + s · (2 · Dz/2 · · fz) + s 2 · 1/(2 · · fz) 2
––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––
1+s · (2 · · fbn/(2 · · fz) 2 )+s 2 · (1/(2 · · fz) 2 ) 1 + s · (2 · Dn/2 · · fz) + s 2 · 1/(2 · · fz) 2
Input:
fz : Blocking frequency MD 1514/1517
Dz : Damping numerator
fbz = 2 · Dz · fz : Bandwidth numerator MD 1515/1518
Dn : Damping denominator
fbz = 2 · Dn · fn : Bandwidth denominator MD 1516/1519
fn=100% : Band-stop filter natural
frequency
MD 1520/1521 (default value)
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 7–129
SINUMERIK 840C (IA)