Siemens SINUMERIK 840C Installation Instructions Manual page 638

09.95
07.97
D 2nd measurement type: Interference frequency response (up to SW 4.4) Mechanical
frequency response n
Meas.
parameter
Note
Measurement
parameter setting
(see Section on Signal
waveforms of the
function generator)

Siemens AG 2001 All Rights Reserved 6FC5197–jAA50
SINUMERIK 840C (IA)
More user manuals on
9.2.4 Speed control loop (axis and spindle) – measurement parameters (4 basic settings – as from SW 3)
As from SW 6:
S
The offset is reached along an acceleration ramp.
S
The acceleration value is defined for an
axis: MD 276*: Acceleration
spindle: MD 419* –
MD 426*: Acceleration constant for 8 gear stages
S
The following applies:
S
The actual measuring function is not activated until the offset value is re-
ached.
S
Bandwidth
Setting of frequency range to be analyzed (must not exceed a value corres-
ponding to half the speed controller sampling frequency). The lower this va-
lue, the finer the frequency resolution will be and the longer the measurement
time.
max.band width +
e.g. 4 kHz with 1 or 2 drive modules (for 125 ms speed controller sampling
time)
S
Averaging operations
The higher this value is set, the more accurate the measurement and the lon-
ger the measurement time. You should normally enter a value of 20.
S
Settling time
This value represents the delay between the start of measured data recording
and injection of the test signal and offset. A settling time of more than zero
(0.1–2 s) should be entered for frequency response measurements in order to
take measurements under steady-state conditions – interference in the
amplitude and phase response may otherwise occur as a result of transient
behaviour.
/Iq (as from SW 5)
act act
To evaluate the noise suppressions by the control (only 611 D–FDD), the interfe-
rence frequency response can be entered. With SW4, this measurement can also
be performed for 611 D_MSD.
You can select the menu Meas. parameters for measuring the speed control loop
with this softkey.
You enter the measurement parameters in the selected display. These parame-
ters are managed internally as configuration data rather than machine data, i.e.
they are not initialized when the machine runs up. Data can be input in two diffe-
rent ways:
S
Manual input
S
Input by loading of an existing, complete data set with the aid of file functions
as for measurement type reference frequency response
ManualsBase.com
9 Drive Servo Start-Up Application (as from SW 3)
Acceleration value=0, no ramp
Acceleration valuey0, ramp active
f
1
sampl.
+
2 2 x t
sampl.
9–17