Siemens SINUMERIK 840C Installation Instructions Manual page 639

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)
D 3rd measurement type: Setpoint step change
The transient response of the speed control in the time range can be assessed
with the step stimulation function for setpoint or disturbance variables. If an off-
set value other than zero is input, the step change is stimulated during transition.
You can select the menu with the parameters for measuring the speed control
Meas.
loop with this softkey.
parameter
Notes 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
different ways:
S
S
The recording starts with the output of the setpoint step, i.e. the step is not visible
in the setpoint signal display. This does not apply to analog drives because a
fixed pre-trigger time corresponding to 10 % of the measurement time is set for
them. If the settling time setting is lower than this 10 % value, then the pre-trigger
time is limited to the settling time.
S
Measurement
parameter settings
S
As from SW 6:
S
S
S
S
S
S
Notes The recording starts with the output of the setpoint step, i.e. the step is not visible
in the setpoint signal display.
If the selected measurement cannot be carried out with the installed drive, the
dialog box 160007 Measurement/drive-type combination not allowed appears
when the Start softkey is selected.
9–18
Manual input
Input by loading of an existing, complete data set with the aid of file functions
Amplitude
This parameter determines the magnitude of the specified disturbance step
change.
Offset
The step is stimulated from standstill or starting from the constant traverse
speed set in this parameter.
The offset is reached along an acceleration ramp.
The acceleration value is defined for an
axis: MD 276*: Acceleration
spindle: MD 419* –
MD 426*: Acceleration constant for 8 gear stages
The following applies:
The actual measuring function is not activated until the offset value is re-
ached.
Measurement time
This parameter determines the period of time to be recorded.
Settling time
This value represents the delay between the start of measured data recording
and injection of the test signal and offset (not relevant for 611D).
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Acceleration value=0, no ramp
Acceleration valuey0, ramp active
09.95
07.97
SINUMERIK 840C (IA)