Siemens SINUMERIK 840C - Manual (Page 638)

Meas.
parameter
09.95
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Siemens AG 2001 All Rights Reserved 6FC5197– j AA50 9–17
SINUMERIK 840C (IA)
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: Acceleration value=0, no ramp
Acceleration value
y 0, ramp active
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
+
f
sampl.
2
+ 1
2 x t
sampl.
e.g. 4 kHz with 1 or 2 drive modules (for 125 m s 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.
D
2nd measurement type: Interference frequency response (up to SW 4.4) Mechanical
frequency response n
act
/Iq
act
(as from SW 5)
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.
Note 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
Measurement as for measurement type reference frequency response
parameter setting
(see Section on Signal
waveforms of the
function generator)
9 Drive Servo Start-Up Application (as from SW 3)
9.2.4 Speed control loop (axis and spindle) – measurement parameters (4 basic settings – as from SW 3)
07.97