Siemens SINUMERIK 840Di, Руководство пользователя

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06.03
13.4 Frequency response measurement
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Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
Fig. 13-4 Example: Measurement results of a reference frequency response measurement
Amplitude
This parameter determines the height of the test signal amplitude. It should be
set to the smallest possible value (e.g. 0.01mm).
Bandwidth
The bandwidth parameter is used to set the analyzed frequency range. The
larger this value, the finer the frequency resolution and the longer the measure-
ment time. The maximum value is given by the position control cycle (T
position
controller
).
Bandwidth
max
[ Hz ] = 1 / (2 * T
position controller
[ sec ])
Example: Position controller cycle: 2msec
Bandwidth
max
= 1 / (2 * 2*10
–3
) = 250Hz
Averaging
The accuracy of the measurement, but the measurement duration, too, will in-
crease with this value. A value of 20 is normally suitable.
Settling time
This value represents the delay between recording of the measured data and
injection of the test setpoint and offset. A value of between 0.2 and 1sec is rec-
ommended. Do not set too low a value for the settling times or the frequency
response and phase diagrams will be distorted.
Measurement
parameters:
Reference
frequency
response
13 Drive Optimization using HMI Advanced