Siemens Sinumerik 840D Series - Page 81

10.03
3.11 Start-up functions
3-81
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
0.100 100.000t [ms]
Fig. 3-32 Timing of disturbance step change, integral branch of velocity controller
deactivated
Trace 1: valve spool setpoint
Trace 2: Actual velocity value
90.000
10.000
180.000
-180.000
Ampl.
[dB]
Phase
[degrees]
1.000 1000.000log [Hz]
1.000 1000.000log [Hz]
Fig. 3-33 Oscillogram showing velocity controlled system v
act
/Q
act
Note: Phase crossover -90 degrees essentially characterizes the
cylinder natural frequency
3 Startup
02.99