Meas.
parameter
Position
contr. loop
09.95
Siemens AG 2001 All Rights Reserved 6FC5197–jAA50 9–19
SINUMERIK 840C (IA)

D4th Measurement type: Disturbance 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
loop with this softkey.
Notes The test signal can also be connected to the speed controller output to allow
assessment of the control response to disturbances (611D FDD only). This func-
tion is also available for 611D MSD when SW 4 is installed.
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:
SManual input
SInput by loading of an existing, complete data set with the aid of file functions
Measurement as for measurement type setpoint step change
parameter settings
Notes as for measurement type setpoint step change
9.2.5 Position control loop (axis and spindle – as from SW 3)
You can select the measuring function for the position control loop with this soft-
key.
Notes Test measurements on the position control loop (axis and spindle) can be
performed on both analog and digital drives.
The spindle measuring system (spindle encoder) must be defined or declared
(NC-MD 5200.2) for the spindle.
Explanation Three different types of measurement are available for testing the speed control
loop: Frequency response
Setpoint step change
Setpoint ramp
The position actual value, following error or speed actual value of the active
measuring system are acquired depending on the type of measurement selected.
The enable commands must be implemented internally or with PLC or with PLC
without NC (SW 4 and higher)
The following applies to the upper and lower traversing range limits:
The specified limit values define the permissible traversing range during start-up.
In the case of a referenced axis/positioned spindle, the limit refers to the
axis/spindle position at the start of the movement and, with a non-referenced
axis/non-positioned spindle, to the axis/spindle position at the start of the first
test movement after the machine is switched on.
Value 0.0 means no traversing limit, i.e. the traversing
range is not monitored.
The current axis/spindle position is displayed in the position actual value/absolute
position field.
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)
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